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Existence and release of fluid inclusions in bornite and its associated quartz and calcite 被引量:3
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作者 Jiu-shuai Deng Shu-ming Wen +3 位作者 Dan-dan Wu Jian Liu Xiao-lin Zhang Hai-ying Shen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第9期815-822,共8页
The existence and release of fluid inclusions in bornite and its associated minerals, namely, quartz and calcite were investigated and confirmed. The structures, forms, and phases of these large quantities of fluid in... The existence and release of fluid inclusions in bornite and its associated minerals, namely, quartz and calcite were investigated and confirmed. The structures, forms, and phases of these large quantities of fluid inclusions were also studied. A mass of fluid inclusions with various sizes, distributions, shapes, and phases exist in bornite and its associated minerals. Their sizes vary from a few micrometers to tens of micrometers, and the forms appear as negative crystals, or elongated, elliptical, and irregular. At room temperature, fluid inclusions were mainly characterized as gas-liquid two- phase. However, small amounts of fluid inclusions with pure gas phase and pure liquid single-phase were also observed in quartz and calcite. These fluid inclusions initially broke during the ore crushing and grinding process and then released into the flotation pulp in the flotation process. The quantitative analysis of fluid inclusions in the solution and the comparisons of mineral dissolution show that the amount of copper and iron released by fluid inclusions in the bornite sample is higher than the amount dissolved by the mineral; fluid inclusions in the associated gangue minerals, quartz, and calcite also make contribution. 展开更多
关键词 FLOTATION fluid inclusions BORNITE quartz CALCITE
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In situ Raman spectroscopic quantification of CH4–CO2 mixture: application to fluid inclusions hosted in quartz veins from the Longmaxi Formation shales in Sichuan Basin, southwestern China 被引量:10
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作者 Ye Qiu Xiao-Lin Wang +4 位作者 Xian Liu Jian Cao Yi-Feng Liu Bin-Bin Xi Wan-Lu Gao 《Petroleum Science》 SCIE CAS CSCD 2020年第1期23-35,共13页
We re-evaluate the Raman spectroscopic quantification of the molar ratio and pressure for CH4–CO2 mixtures.Firstly,the Raman quantification factors of CH4 and CO2 increase with rising pressure at room temperature,ind... We re-evaluate the Raman spectroscopic quantification of the molar ratio and pressure for CH4–CO2 mixtures.Firstly,the Raman quantification factors of CH4 and CO2 increase with rising pressure at room temperature,indicating that Raman quantification of CH4/CO2 molar ratio can be applied to those fluid inclusions(FIs)with high internal pressure(i.e.,>15 MPa).Secondly,the v1(CH4)peak position shifts to lower wavenumber with increasing pressure at constant temperature,confirming that the v1(CH4)peak position can be used to calculate the fluid pressure.However,this method should be carefully calibrated before applying to FI analyses because large discrepancies exist among the reported v1(CH4)-P curves,especially in the highpressure range.These calibrations are applied to CH4-rich FIs in quartz veins of the Silurian Longmaxi black shales in southern Sichuan Basin.The vapor phases of these FIs are mainly composed of CH4 and minor CO2,with CO2 molar fractions from4.4%to 7.4%.The pressure of single-phase gas FI ranges from 103.65 to 128.35 MPa at room temperature,which is higher than previously reported.Thermodynamic calculations supported the presence of extremely high-pressure CH4-saturated fluid(218.03–256.82 MPa at 200°C),which may be responsible for the expulsion of CH4 to adjacent reservoirs. 展开更多
关键词 Raman spectroscopy Molar ratio fluid pressure CO2–CH4 MIXTURE fluid inclusion Paleo-overpressure
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A TEM Study on Fluid Inclusions in Coesite-bearing Jadeite Quartzite in Shuanghe in the Dabie Mountains 被引量:4
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作者 WUXiuling MENGDawei HANYujing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2004年第1期121-124,共4页
Fluid inclusions at a nano to sub-micron scale in quartz from jadeite quartzite at Shuanghe, Dabie Mountains, have been investigated by using the transmission electron microscopy (TEM). Most fluid inclusions are spher... Fluid inclusions at a nano to sub-micron scale in quartz from jadeite quartzite at Shuanghe, Dabie Mountains, have been investigated by using the transmission electron microscopy (TEM). Most fluid inclusions are spherical or negative crystal shaped, forming wide swarm-like trails. The TEM reveals that the relationship between coesite and the host quartz is syntaxic and provides strong evidence of the occurrence of high-salty fluids at peak metamorphic conditions. The fluid inclusions are often connected to dislocations, which are undetected at the scale of optical microscopy. Non-decrepitation leakage of fluid inclusions may occur by pipe diffusion of molecule H2O or CO2 along dislocations from the inclusions into the host quartz, thus leading to original inclusion density and composition changes. It should be taken into full account for the correct petrological interpretation of micro-thermometric results. 展开更多
关键词 UHP jadeite-quartzite quartz nano-scale fluid inclusion TEM Dabie Mountains
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Rb-Sr Dating of Pyrite and Quartz Fluid Inclusions and Origin of Ore-forming Materials of the Jinshan Gold Deposit, Northeast Jiangxi Province, South China 被引量:2
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作者 MAO Guangzhou HUA Renmin +1 位作者 LONG Guangming LU Huijuan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第6期1658-1667,共10页
The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr... The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit.Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma,with an initial 87Sr/86Sr value of 0.7045±0.0020.However,the age of the gold-bearing quartz vein-type ore is about 379±49Ma,and the initial 87Sr/86Sr is 0.7138±0.0011.Based on the age data from this work and many previous studies,the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization,which may include the Jinninian,Caledonian,Hercynian,and Yanshanian Periods.Among them,the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit.The Jinninian Period is the main stage for the formation of alteration-type ore bodies,while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type.The initial values of the 87Sr/86Sr from this study,as well as the previous isotope and trace element studies,indicate that the ore-forming materials mainly derived from the metamorphic wall rocks,and the ore-forming fluids mainly originated from the deep metamorphic water. 展开更多
关键词 Gold deposit mineralization time quartz fluid inclusion PYRITE Rb-Sr dating Origin of the ore-forming materials Jinshan Jiangxi province
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Fluid Inclusions in the Gold-Bearing Quartz Veins at Um Rus Area, Eastern Desert, Egypt 被引量:1
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作者 MOHAMEDELTOKHI ABDALLAELMUSLEM 《Chinese Journal Of Geochemistry》 EI CAS 2002年第2期131-139,共9页
Fluid inclusions in the gold-bearing quartz veins at the Um Rus area are of three types: H\-2O, H\-2O-CO\-2 and CO\-2 inclusions. H\-2O inclusions are the most abundant, they include two phases which exhibit low and h... Fluid inclusions in the gold-bearing quartz veins at the Um Rus area are of three types: H\-2O, H\-2O-CO\-2 and CO\-2 inclusions. H\-2O inclusions are the most abundant, they include two phases which exhibit low and high homogenization temperatures ranging from 150 to 200℃ and 175 to 250℃, respectively. The salinity of aqueous inclusions, based on ice melting, varies between \{6.1\} and 8 equiv. wt% NaCl. On the other hand, H\-2O-CO\-2 fluid inclusions include three phases. Their total homogenization temperatures range from 270 to 325℃, and their salinity, based on clathrate melting, ranges between \{0.8\} and \{3.8\} equiv. wt% NaCl. CO\-2 fluid inclusions homogenize to a liquid phase and exhibit a low density range from \{0.52\} to \{0.66\} g/cm\+3. The partial mixing of H\-2O-CO\-2 and salt H\-2O-NaCl fluid inclusions is the main source of fluids from which the other types of inclusions were derived. The gold-bearing quartz veins are believed to be of medium temperature hydrothermal convective origin. 展开更多
关键词 液体包裹体 石英 氯化钠液体 埃及 金矿化带
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Magmatic-hydrothermal Evolution and Mineralization Mechanisms of the Wangjiazhuang Cu(-Mo)Deposit in the Zouping Volcanic Basin,Shandong Province,China:Constraints from Fluid Inclusions
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作者 SHU Lei YANG Renchao +5 位作者 SHEN Kun YANG Deping MAO Guangzhou LI Min LIU Pengrui MA Xiaodong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第3期679-700,共22页
The Wangjiazhuang Cu(-Mo)deposit,located within the Zouping volcanic basin in western Shandong Province,China,is unique in this area for having an economic value.In order to expound the metallogenetic characteristics ... The Wangjiazhuang Cu(-Mo)deposit,located within the Zouping volcanic basin in western Shandong Province,China,is unique in this area for having an economic value.In order to expound the metallogenetic characteristics of this porphyry-like hydrothermal deposit,a detailed fluid inclusion study has been conducted,employing the techniques of representative sampling,fluid inclusion petrography,microthermometry,Raman spectroscopy,LA-ICP-MS analysis of single fluid inclusions,as well as cathode fluorescence spectrometer analysis of host mineral quartz.The deposit contains mainly two types of orebodies,i.e.veinlet-dissemination-stockwork orebodies in the K-Si alteration zone and pegmatiticquartz sulfide veins above them.In addition,minor breccia ore occurs locally.Four types of fluid inclusions in the deposit and altered quartz monzonite are identified:L-type one-or two-phase aqueous inclusions,V-type vapor-rich inclusions with V/L ratios greater than 50%-90%,D-type multiphase fluid inclusions containing daughter minerals or solids and S-type silicate-bearing fluid inclusions containing mainly muscovite and biotite.Ore petrography and fluid inclusion study has revealed a three-stage mineralization process,driven by magmatic-hydrothermal fluid activity,as follows.Initially,a hydrothermal fluid,separated from the parent magma,infiltrated into the quartz monzonite,resulting in its extensive K-Si alteration,as indicated by silicate-bearing fluid inclusions trapped in altered quartz monzonite.This is followed by the early mineralization,the formation of quartz veinlets and dissemination-stockwork ores.During the main mineralization stage,due to the participation and mixing of meteoric groundwater with magmatic-sourced hydrothermal fluid,the cooling and phase separation caused deposition of metals from the hydrothermal fluids.As a result,the pegmatitic-quartz sulfide-vein ores formed.In the late mineralization stage,decreasing fluid salinity led to the formation of L-type aqueous inclusions and chalcopyrite-sulfosalt ore.Coexistence of V-type and D-type inclusions and their similar homogenization temperatures with different homogenization modes suggest that phase separation or boiling of the ore-forming fluids took place during the early and the main mineralization stages.The formation P-T conditions of S-type inclusions and the early and the main mineralization stages were estimated as ca.156-182 MPa and 450-650℃,350-450℃,18-35 MPa and 280-380℃,8-15 MPa,respectively,based on the microthermometric data of the fluid inclusions formed at the individual stages. 展开更多
关键词 fluid inclusions fluid immiscibility mineralization mechanisms Wangjiazhuang Cu(-Mo)deposit
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Genesis of the Jianbeigou Gold Deposit on the Southern Margin of the North China Craton: Insights from Fluid Inclusions, H-O-S Isotopes, and Pyrite in situ Trace Element Analyses
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作者 LI Fengchun ZENG Qingdong +5 位作者 ZHU Rixiang CHU Shaoxiong XIE Wei YU Bing WU Jinjian LI Xinghui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第4期969-991,共23页
The Jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt, located on the southern margin of the North China Craton. Three stages of the hydrothermal process can be distinguished, inc... The Jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt, located on the southern margin of the North China Craton. Three stages of the hydrothermal process can be distinguished, including the quartz ± pyrite, quartz-polymetallic sulfide, and quartz-carbonate ± pyrite stages. From the early to late stages, the homogenization temperatures of primary fluid inclusions are 281–362°C, 227–331°C, and 149–261°C, respectively. The corresponding salinities estimated for these fluids are 3.9–9.9 wt%, 0.4–9.4 wt%, and 0.7–7.2 wt% Na Cl equiv. Combined with laser Raman spectroscopy data, the ore-forming fluid belongs to a H_(2)O-CO_(2)-Na Cl ± CH_4 system with medium–low temperature and salinity. The δ~(18)Ofluid and δD values for the quartz veins are-1.0‰ to 6.0‰ and-105‰ to-84‰, respectively, which indicates that the ore-forming fluid is of mixed source, mainly derived from magma, with a contribution from meteoric water. Pyrite has been identified into three generations based on mineral paragenetic sequencing, including Py1, Py2, and Py3. The pyrites have δ~(34)S sulfur isotopic compositions from three stages between 3.7‰ and 8.4‰, indicating that sulfur mainly originated from magma. Te, Bi, Sb, and Cu contents in pyrite were all high and showed a strong correlation with Au concentrations. Native gold and the Au-Ag-Bi telluride minerals were formed concurrently, and the As concentration was low and decoupled from the Au content. Therefore, Te, Bi, Sb and other low-melting point chalcophile elements play an important role for gold mineralization in arsenic-deficient ore-forming fluid. Combined with the geological setting, evolution of pyrite, and ore-fluids geochemistry, we propose that the Jianbeigou deposit can be classified as a magmatic–hydrothermal lode gold deposit. Gold mineralization on the southern margin of the North China Craton is related to Early Cretaceous magmatism and formed in an extensional setting. 展开更多
关键词 ore genesis H-O-S isotopes fluid inclusions in-situ trace element Jianbeigou gold deposit
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He-Ar Isotopic Systematics of Fluid Inclusions in Pyrites from PGEpolymetallic Deposits in Lower Cambrian Black Rock Series, South China 被引量:16
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作者 SUNXiaoming WANGMin +2 位作者 XUETing MAMingyang LIYinhe 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2004年第2期471-475,共5页
He-Ar isotopic compositions of fluid inclusions trapped in pyrites from some representative PGE-polymetallic deposits in Lower Cambrian black rock series in South China were analyzed by using an inert gas isotopic mas... He-Ar isotopic compositions of fluid inclusions trapped in pyrites from some representative PGE-polymetallic deposits in Lower Cambrian black rock series in South China were analyzed by using an inert gas isotopic mass spectrometer. The results show that the ore-forming fluids possess a low 3He/4He ratio, varying from 0.43×10-8 to 26.39×10-8, with corresponding R/Ra value of 0.003-0.189. The 40Ar/36Ar ratios are 258-287, close to those of air saturated water (ASW). He-Ar isotopic indicator studies show that the ore-forming fluids were mainly derived from the formation water or basinal hot brine and sea water, while the content of mantle-derived fluid or deep-derived magmatic water might be negligible. The PGE-polymetallic mineralization might be related to the evolution of the Caledonian miogeosynclines distributed along the southern margin of the Yangtze Craton. During the Early Cambrian, the formation water or basinal hot brine trapped in Caledonian basins which accumulated giant thick sediments was expelled and migrated laterally along strata because of the pressure generated by overlying sediments. The basinal hot brine ascended along faults, mixed with sea water and finally deposited ore minerals. 展开更多
关键词 He-Ar isotopic systematics pyrite fluid inclusions PGE-polymetallic deposit basinal hot brine
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Genesis of the Zhaokalong Fe-Cu Polymetallic Deposit at Yushu, China: Evidence from Ore Geochemistry and Fluid Inclusions 被引量:15
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作者 LI Huan XI Xiaoshuang +1 位作者 WU Chengming Koichiro WATANABE 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第2期486-500,共15页
The ore types of the Zhaokalong Fe-Cu deposit are divided into two categories: sulfide-type and oxide-type. The sulfide-type ore include siderite ore, galena-sphalerite ore and chalcopyrite ore, whereas the oxide-typ... The ore types of the Zhaokalong Fe-Cu deposit are divided into two categories: sulfide-type and oxide-type. The sulfide-type ore include siderite ore, galena-sphalerite ore and chalcopyrite ore, whereas the oxide-type ore include magnetite ore and hematite ore. The ore textures and structures indicate that the Zhaokalong deposit is of the sedimentary-exhalative mineralization type. Geochemical analyses show that the two ore types have a high As, Sb, Mn, Co and Ni content. The REE patterns reveal an enrichment of the LREE compared to the HREE. Isotopic analysis of siderite ore reveal that the j13CpDB ranges from -2.01 to 3.34 (%0) whereas the JISOsMow ranges from 6.96 to 18.95 (%0). The fluid inclusion microthermometry results indicate that homogenization temperatures of fluid inclusions in quartz range from 131 to 181~C, with salinity values of 1.06 to 8.04 wt% NaCI eq. The mineralizing fluid therefore belongs to the low temperature - low salinity system, with a mineralizing solution of a CO2-Ca2+(Na+, K+)-SO42- (F-, CI--H20 system. The geochemical results and fluid inclusion data provide additional evidence that the Zhaokalong deposit is a sedex-type deposit that experienced two stages of mineralization. The sulfide mineralization probably occurred first, during the sedimentary exhalative process, as exhibited by the abundance of marine materials associated with the sulfide ores, indicating a higher temperature and relatively deoxidized oceanic depositional environment. After the main exhalative stage, hydrothermal activity was superimposed to the sulfide mineralization. The later stage oxide mineralization occurred in a low temperature and relatively oxidized environment, in which magmatic fluid circulation was dominant. 展开更多
关键词 exhalative sedimentary deposit (SEDEX) fluid inclusions ore geochemistry Zhaokalong Sanjiang ore belt
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Fluid Inclusions and Metallization of the Kendekeke Polymetallic Deposit in Qinghai Province, China 被引量:8
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作者 HUANG Min LAI Jianqing MO Qingyun 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第2期570-583,共14页
The Kendekeke polymetallic deposit,located in the middle part of the magmatic arc belt of Qimantag on the southwestern margin of the Qaidam Basin,is a polygenetic compound deposit in the Qimantag metallogenic belt of ... The Kendekeke polymetallic deposit,located in the middle part of the magmatic arc belt of Qimantag on the southwestern margin of the Qaidam Basin,is a polygenetic compound deposit in the Qimantag metallogenic belt of Qinghai Province.Multi-periodic ore-forming processes occurred in this deposit,including early-stage iron mineralization and lead-zinc-gold-polymetallic mineralization which was controlled by later hydrothermal process.The characteristics of the ore-forming fluids and mineralization were discussed by using the fluid inclusion petrography,Laser Raman Spectrum and micro-thermometry methods.Three stages,namely,S1-stage (copper-iron-sulfide stage),S2-stage (lead-zinc-sulfide stage) and C-stage (carbonate stage) were included in the hydrothermal process as indicated by the results of this study.The fluid inclusions are in three types:aqueous inclusion (type I),CO2-aqueous inclusion (type Ⅱ) and pure CO2 inclusion (type Ⅲ).Type Ⅰ inclusions were observed in the S1-stage,having homogenization temperature at 240-320℃,and salinities ranging from 19.8% to 25.0% (wt% NaCl equiv.).All three types of inclusions,existing as immiscible inclusion assemblages,were presented in the S2-stage,with the lowest homogenization temperature ranging from 175 ℃ to 295℃,which represents the metallogenic temperature of the S2-stage.The salinities of these inclusions are in the range of 1.5% to 16%.The fluid inclusions in the C-stage belong to types Ⅰ,Ⅱ and Ⅲ,having homogenization temperatures at 120-210℃,and salinities ranging from 0.9% to 14.5%.These observations indicate that the ore-forming fluids evolved from high-temperature to low-temperature,from high-salinity to low-salinity,from homogenization to immiscible separation.Results of Laser Raman Spectroscopy show that high density of CO2 and CH4 were found as gas compositions in the inclusions.CO2,worked as the pH buffer of ore-forming fluids,together with reduction of organic gases (i.e.CH4,etc),affected the transport and sediment of the minerals.The fluid system alternated between open and close systems,namely,between lithostatic pressure and hydrostatic pressure systems.The calculated metallogenic pressures are in the range of 30 to 87 Mpa corresponding to 3 km mineralization depth.Under the influence of tectonic movements,immiscible separation occurred in the original ore-forming fluids,which were derived from the previous high-salinity,high-temperature magmatic fluids.The separation of CO2 changed the physicochemical properties and composition of the original fluids,and then diluted by mixing with extraneous fluids such as meteoric water and groundwater,and metallogenic materials in the fluids such as lead,zinc and gold were precipitated. 展开更多
关键词 fluid inclusions laser Raman spectroscopy KENDEKEKE Qinghai Province
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Degree of Brine Evaporation and Origin of the Mengyejing Potash Deposit:Evidence from Fluid Inclusions in Halite 被引量:12
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作者 SHEN Lijian LIU Chenglin +3 位作者 WANG Licheng HU Yufei HU Mingyue FENG Yuexing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第1期175-185,共11页
The Mengyejing potash deposit is located in the southern port of the Simao Basin, Yunnan Province, and is hosted in mid-Cretaceous strata. The chemical compositions of fluid inclusions in halite crystals, collected fr... The Mengyejing potash deposit is located in the southern port of the Simao Basin, Yunnan Province, and is hosted in mid-Cretaceous strata. The chemical compositions of fluid inclusions in halite crystals, collected from the level-610 adit in the deposit, were analysed by laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS). The results show that the brine is of the Na-K-Mg-Ca-Cl type and has K concentrations that are distinctly higher than those of Mg and Ca, unlike normal brines associated with Cretaceous halite. The high K concentrations indicate that the degree of evaporation of the ancient Mengyejing saline lake was very high, reaching the sylvite deposition stage but rarely reaching the carnallite deposition stage. The trajectory of the H and O isotopic compositions of the brines in the halite-hosted fluid inclusions corresponds to intense evaporation, indicating that the net evaporation exceeded the net inflow of brines. These brine compositions in halite-hosted fluid inclusions were likely formed by the dissolution of previously deposited K-bearing minerals by fresh continental and/or seawater, forming a type of modified seawater, with deep hydrothermal fluids potentially supplying additional potassium. The basin likely experienced multiple seawater incursion, dissolution and redeposition events in a high-temperature environment with high evaporation rates. 展开更多
关键词 CRETACEOUS halite fluid inclusions H and O isotopic compositions brine chemical compositions Mengyejing potash deposit Yunnan Province
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Discovery and Significance of High CH_4 Primary Fluid Inclusions in Reservoir Volcanic Rocks of the Songliao Basin,NE China 被引量:14
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作者 WANG Pujun HOU Qijun +4 位作者 WANG Keyong CHEN Shumin CHENG Rihui LIU Wanzhu LI Quanlin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2007年第1期113-120,共8页
Comparing compositions of the fluid inclusions in volcanic rocks to the contents and isotopes of the gases in corresponding volcanic reservoirs using microthermometry, Raman microspectroscopy and mass spectrum analysi... Comparing compositions of the fluid inclusions in volcanic rocks to the contents and isotopes of the gases in corresponding volcanic reservoirs using microthermometry, Raman microspectroscopy and mass spectrum analysis, we found that: (1) up to 82 mole% methane exists in the primary inclusions hosted in the reservoir volcanic rocks; (2) high CH4 inclusions recognized in the volcanic rocks correspond to CH4-bcaring CO2 reservoirs that are rich in helium and with a high ^3He/^4He ratio and which show reversed order of 813C in alkane; (3) in gas reservoirs of such abiotic methane (〉80%) and a mix of CH4 and CO2, the enclosed content of CH4 in the volcanic inclusions is usually below 42 mole%, and the reversed order of δ^13C in alkane is sometimes irregular in the corresponding gas pools; (4) a glassy inclusion with a homogeneous temperature over 900℃ also contains a small portion of CH4 although predominantly CO2. This affinity between gas pool and content of inclusion in the same volcanic reservoirs demonstrates that magma-originated gases, both CH4 and CO2, have contributed significantly to the corresponding gas pools and that the assumed hydrocarbon budget of the bulk earth might be much larger than conventionally supposed. 展开更多
关键词 Songliao Basin reservoir volcanic rocks fluid inclusions methane (CH4) carbon dioxide (CO2) abiogenic origin natural gas
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A Preliminary Study on Fluid Inclusions and Mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit 被引量:4
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作者 WANG Lijuan ZHU Xinyou +3 位作者 WANG Jingbin DENG Jiniu WANG Yuwang ZHU Heping 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2008年第4期838-844,共7页
The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming f... The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockwork rocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluid activities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonates near the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximal facies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloor fluid activity. Fluids in altered stockwork rocks and carbonates have similar H20-NaCI-CO2 system, both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to the unstratified ore bodies. Boiling of the fluids causes the separation of CO2 vapor and liquid H2O. When the fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2, decreasing temperature and pressure as well as some involvement of seawater into the fluids result in the unmixing of fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in the unconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The oreforming temperature of unstratified ore bodies is up to high temperature indicating that there is a huge ore-forming potential in its deep. 展开更多
关键词 sedimentary-exhalative system pipe facies unstratified ore bodies fluid inclusions the Xitieshan lead-zinc deposit
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A Review of Fluid Inclusions in Diagenetic Systems 被引量:2
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作者 Terrence P.MERNAGH 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第3期697-714,共18页
The study of fluid inclusions can help constrain the conditions at which diagenetic minerals precipitated,leading to a better understanding of the geologic controls and relative timing of changes in porosity and/or mi... The study of fluid inclusions can help constrain the conditions at which diagenetic minerals precipitated,leading to a better understanding of the geologic controls and relative timing of changes in porosity and/or mineralising events.Many of the diagenetic minerals are easily deformed and it is important to check for any post-entrapment changes to the inclusions.Possible post-entrapment changes include reaction with the host crystal,necking down,nucleation metastability and thermal reequilibration.The recommended method of detecting these problems is to examine individual fluid inclusion assemblages(FIAs) and report data for each individual FIA.These studies have been enhanced by the development of new micro-analytical techniques such as micro-fluorescence spectroscopy,micro-infrared spectroscopy,nuclear magnetic resonance,various mass spectrometry techniques and the analysis of individual fluid inclusions using laser ablation/decrepitation methods.Special techniques have been developed for hydrocarbon-bearing inclusions such as the Grains containing Oil Inclusions(GOI),Fluid Inclusion Stratigraphy(FIS),and the Molecular Composition of Inclusions(MCI) techniques.The fluid inclusions that form in some minerals during diagenesis provide the only direct means of examining the fluids present in these systems.They provide useful temperature,pressure,and fluid composition data that cannot be obtained by other means. 展开更多
关键词 fluid inclusions DIAGENESIS saline formations hydrocarbons mineralisation
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Genesis of the Ciemas Gold Deposit and Relationship with Epithermal Deposits in West Java,Indonesia:Constraints from Fluid Inclusions and Stable Isotopes 被引量:2
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作者 ZHENG Chaofei ZHANG Zhengwei +1 位作者 WU Chengquan YAO Junhua 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第3期1025-1040,共16页
The Ciemas gold deposit is located in West Java of Indonesia, which is a Cenozoic magmatism belt resulting from the Indo-Australian plate subducting under the Eurasian plate. Two different volcanic rock belts and asso... The Ciemas gold deposit is located in West Java of Indonesia, which is a Cenozoic magmatism belt resulting from the Indo-Australian plate subducting under the Eurasian plate. Two different volcanic rock belts and associated epithermal deposits are distributed in West Java: the younger late Miocene-Pliocene magmatic belt generated the Pliocene-Pleistocene epithermal deposits, while the older late Eocene-early Miocene magmatic belt generated the Miocene epithermal deposits. To constrain the physico-chemical conditions and the origin of the ore fluid in Ciemas, a detailed study of ore petrography, fluid inclusions, laser Raman spectroscopy, oxygen-hydrogen isotopes for quartz was conducted. The results show that hydrothermal pyrite and quartz are widespread, hydrothermal alteration is well developed, and that leaching structures such as vuggy rocks and extension structures such as comb quartz are common. Fluid inclusions in quartz are mainly liquid-rich two phase inclusions, with fluid compositions in the NaCI-H2O fluid system, and contain no or little CO2. Their homogenization temperatures cluster around 240℃-320℃, the salinities lie in the range of 14-17 wt.% NaCI equiv, and the calculated fluid densities are 0.65-1.00 g/cm^3. The values of δ18OH2O-VSMOW for quartz range from +5.5%0 to +7.7‰, the δDVSMOW of fluid inclusions in quartz ranges from -70‰ to -115‰. All of these data indicate that mixing of magmatic fluid with meteoric water resulted in the formation of the Ciemas deposit. A comparison among gold deposits of West Java suggests that Miocene epithermal ore deposits in the southernmost part of West Java were more affected by magmatic fluids and exhibit a higher degree of sulfidation than those of Pliocene-Pleistocene. 展开更多
关键词 fluid inclusions oxygen and hydrogen isotopes EPITHERMAL SUBDUCTION Ciemas golddeposit West Java Indonesia
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Geochronology,Fluid Inclusions and Isotopic Characteristics of the Dongjun Pb-Zn-Ag Deposit,Inner Mongolia,NE China 被引量:6
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作者 XIE Wei WEN Shouqin +1 位作者 ZHANG Guangliang TANG Tieqiao 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2021年第5期1611-1633,共23页
The Dongjun Pb-Zn-Ag deposit in the northern part of the Great Xing’an Range(NE China)consists of quartzsulfide vein-type and breccia-type mineralization,related to granite porphyry.Hydrothermal alteration is well-de... The Dongjun Pb-Zn-Ag deposit in the northern part of the Great Xing’an Range(NE China)consists of quartzsulfide vein-type and breccia-type mineralization,related to granite porphyry.Hydrothermal alteration is well-developed and includes potassic-silicic-sericitic alteration,phyllic alteration and propylitic alteration.Three stages of mineralization are recognized on the basis of field evidence and petrographic observation,demarcated by assemblages of quartz-pyritearsenopyrite(early stage),quartz-polymetallic sulfide(intermediate stage)and quartz-carbonate-pyrite(late stage).Zircon LA-ICP-MS U-Pb dating indicates that the granite porphyry was emplaced at 146.7±1.2 Ma(Late Jurassic).Microthermometry and laser Raman spectroscopy shows that ore minerals were deposited in conditions of intermediate temperatures(175-359℃),low salinity(0.5-9.3 wt% Na Cl eqv.)and low density(0.60-0.91 g/cm^(3)).Ore-forming fluids were derived largely from magmatic hydrothermal processes,with late-stage addition of meteoric water,belonging to a H_(2)O-NaCl-CO_(2)±CH_(4) system.The δ^(34)SV-CDT values range from 0.75‰ to 4.70‰.The ^(206)Pb/^(204)Pb,^(207)Pb/^(204)Pb,and ^(208)Pb/^(204)Pb values of the ore minerals are in the ranges of 18.240-18.371,15.542-15.570,and 38.100-38.178,respectively.Data for the S and Pb isotopic systems indicate that the ore-forming metals and sulfur were derived from Mesozoic magma.Based on the geological characteristics and geochemical signatures documented in this study,we conclude that the Dongjun deposit is a mesothermal magmatic hydrothermal vein-type Pb-Zn-Ag deposit controlled by fractures and related to granite porphyry,in response to Late Jurassic tectonic-magmatic-hydrothermal activity.We further conclude that fluid immiscibility,fluid mixing and fluid-rock interactions were the dominant mechanisms for deposition of the ore-forming materials. 展开更多
关键词 zircon U-Pb dating fluid inclusions H-O-S-Pb isotopes mesothermal Pb-Zn-Ag deposit Dongjun northern Great Xing’an Range
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Evaporation Stage of Paleo-saline Lake in the Sichuan Basin, China: Insight from Fluid inclusions in Halite 被引量:3
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作者 DING Ting LIU Chenglin +3 位作者 GUO Fusheng ZHAO Yanjun WANG Mingquan CHEN Liuqin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第3期801-808,共8页
Sichuan Basin is one of the most important marine–salt forming basins in China. The Simian and Triassic have a large number of evaporites. The Triassic strata have found a large amount of polyhalite and potassium-ric... Sichuan Basin is one of the most important marine–salt forming basins in China. The Simian and Triassic have a large number of evaporites. The Triassic strata have found a large amount of polyhalite and potassium-rich brine. However, no soluble potassium salt deposit were found. In this study, the halite in well Changping 3 which is located at the eastern part of the Sichuan basin was studied using the characteristics, hydrogen and oxygen isotopes of the fluid inclusion in halite to reconstruct the paleoenvironment. The salt rocks in well Changping 3 can be divided into two types: grey salt rock and orange salt rock. The result shows that the isotopic composition of the halite fluid inclusion is distinct from the global precipitation line reflecting that the salt formation process is under strong evaporation conditions and the climate is extremely dry. At the same time, compared with the hydrogen and oxygen isotopes of brine in the Sichuan Basin and the hydrous isotope composition of the inclusions in the salt inclusions of other areas in China, it is shown that the evaporation depth of the ancient seawater in the Sichuan Basin was high and reached the precipitation of potassium and magnesium stage. 展开更多
关键词 hydrogen and oxygen isotopes fluid inclusions HALITE TRIASSIC Sichuan Basin
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Zn release from fluid inclusions in a natural sphalerite 被引量:1
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作者 Shu-ming Wen Jian Liu +3 位作者 Bo Li Run-sheng Han Yi Zhang Jiu-shuai Deng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第5期420-426,共7页
The type, size, and compositions of fluid inclusions in a natural sphalerite were investigated and the total concentration of Zn released from the fluid inclusions was measured. To compare the total concentration of Z... The type, size, and compositions of fluid inclusions in a natural sphalerite were investigated and the total concentration of Zn released from the fluid inclusions was measured. To compare the total concentration of Zn released from the fluid inclusions with that dissolved from the sphalerite itself, dissolution experiments and theoretical calculations for the dissolution equilibrium of the sphalerite were also performed. The results indicate that large numbers of fluid inclusions with various sizes exist in the sphalerite, which can be divided into four types, i.e., pure gaseous inclusions, pure liquid inclusions, gas-liquid inclusions, and gas-liquid inclusions containing solid minerals. These inclusions were broken open during the grinding process, and their compositions were released to the solution. The total concentration of Zn released from these inclusions reaches 18.35×10^-6 mol/L, which is much higher than that of Zn dissolved from the sphalerite itself (1.93×10^-6 mol/L) and the theoretical calculation value (2.73×10^-8 mol/L). 展开更多
关键词 zinc ore treatment SPHALERITE fluid inclusions FLOTATION
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Characterization and recovery of the halophiles in the fluid inclusions in halite 被引量:1
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作者 HU Bin KONG Fanjing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期71-72,共2页
1 Introduction It is the focus of geology and biology that the creature preserved in the geological history and the organic evolution.The creature preserved in geological history by these things:sedimentary,frozen ear... 1 Introduction It is the focus of geology and biology that the creature preserved in the geological history and the organic evolution.The creature preserved in geological history by these things:sedimentary,frozen earth,chrysophoron and evaporation salt.Evaporation salt can preserve the microbe 展开更多
关键词 fluid inclusions in halite HALOPHILES DNA extraction
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The homogenization temperature in the fluid inclusions of Ordovician halite and paleoclimatic implication 被引量:1
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作者 HU Bin KONG Fanjing +2 位作者 ZHANG Yongsheng ZHENG Mianping CHEN Jing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期10-11,共2页
1 Introduction The homogenization temperature of fluid inclusions reflects the temperatures of the brines from which halite crystals grew.Therefore,it is a powerful mean to reveal the paleoclimate.Northern Shaanxi Sal... 1 Introduction The homogenization temperature of fluid inclusions reflects the temperatures of the brines from which halite crystals grew.Therefore,it is a powerful mean to reveal the paleoclimate.Northern Shaanxi Salt Basin is located in the central and eastern of Ordos Basin.We have detail petrographical research and the homogenization 展开更多
关键词 fluid inclusions in halite homogenization temperature cooling nucleation method halite of Northern Shaanxi Basin in Ordovician paleoclimate.
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