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西南低温成矿域Au-Sb-Hg-Pb-Zn矿床方解石REE地球化学特征及找矿指示
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作者 付浩 王加昇 +4 位作者 常晋阳 王燕 王博 叶彬 李浩宇 《矿物学报》 CAS CSCD 北大核心 2024年第1期43-57,共15页
西南大面积低温成矿域是我国Au、Sb、Hg、Pb-Zn等中低温热液矿床的重要基地,各种热液矿床之间是否存在成因关系仍是一个悬而未决的科学问题。方解石是各种热液矿床的重要脉石矿物,本文选择上述各种中低温矿种中的丫他卡林型金矿床、晴隆... 西南大面积低温成矿域是我国Au、Sb、Hg、Pb-Zn等中低温热液矿床的重要基地,各种热液矿床之间是否存在成因关系仍是一个悬而未决的科学问题。方解石是各种热液矿床的重要脉石矿物,本文选择上述各种中低温矿种中的丫他卡林型金矿床、晴隆-巴年锑矿床、拉峨汞矿床、会泽铅锌矿床等作为典型矿床,并对矿床中出露的成矿和非成矿期方解石进行REE对比研究。结果发现,不同类型矿床成矿期方解石明显具有不同的REE特征,卡林型金矿床中显示MREE富集,锑矿床显示M-HREE富集的特征,说明金、锑矿床的成矿流体来源可能与深部隐伏花岗岩体有关;Pb-Zn-Hg矿床整体显示LREE富集,Hg矿床与标准海相碳酸盐岩LREE富集的配分模式一致,但Pb-Zn矿床中轻稀土元素内部具有La、Ce亏损的左倾特征,说明Hg矿床成矿流体可能主要来自于大气降水对赋矿海相碳酸盐岩的溶解作用,铅锌矿床成矿流体可能来自于盆地卤水浸取基底地层及其围岩所形成的混合流体。无论何种矿种,与成矿无关的方解石均具有LREE富集的特征,方解石的上述REE配分模式特征也可作为各种类型热液矿床的重要找矿标志。 展开更多
关键词 au-sb-Hg-Pb-Zn矿床 方解石 稀土元素 西南大面积低温成矿域
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Geology and mineralization of the Dongping supergiant alkalic-hosted Au-Te deposit(>100 t Au)in Northern Hebei Province,China:A review
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作者 Shi-min Zhen Da-zhao Wang +2 位作者 Zhong-jian Zha Hai-jun Bai Jiang Wang 《China Geology》 CAS CSCD 2024年第3期533-550,共18页
The Dongping deposit is the largest alkalic-hosted gold deposit in China containing>100 t of Au.This paper presents a new understanding for Dongping ore system,based on the previous studies.The mineralization origi... The Dongping deposit is the largest alkalic-hosted gold deposit in China containing>100 t of Au.This paper presents a new understanding for Dongping ore system,based on the previous studies.The mineralization originally occurred at 400-380 Ma,simultaneous with emplacement of the Shuiquangou alkaline complex,and was overprinted by the hydrothermal activity in the Yanshanian.Isotope compositions of ores indicate metals of the deposit are mainly provided by the Shuiquangou complex.Ore-forming fluids are characterized by increasing oxygen fugacity and decreasing sulfur fugacity,while tellurium fugacity increased in the Stage II-2 and decreased in Stage II-3.These systematic changes are closely related to the processes of mineral precipitation and fluid evolution.Sulfide precipitation from Stage Ⅰ to Stage Ⅱ was triggered by fluid boiling,which leads to the precipitation of Pb-Bi-Te,due to decrement of sulfur fugacity.Condensation of gas phase containing high concentration of H_2Te leads to precipitation of Te-Au-Ag minerals and native tellurium.Based on these hypotheses,this paper present a polyphase metallogenic model as follow.During the Devonian,fluids were released from alkaline magmas,which carried ore-forming materials form the surrounding rocks and precipitate the early ores.During the Jurassic-Cretaceous,fluorine-rich fluids exsolved from highly factionated Shangshuiquan granite,which extracted and concentrated Au from the Shuiquangou complex and the Sanggan Group metamorphic rocks,and finally formed the Dongping gold deposit. 展开更多
关键词 Mineralization and alteration Alkaline intrusion au deposit Physicochemical conditions Metallogenic model Oxygen fugacity Sulfur fugacity Mechanisms of mineral precipitation Fluid boiling Fluorine-enriched fluid Dongping gold deposit North China Craton Mineral exploration engineering
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柴北缘滩间山金矿区Au-As-Sb地球化学异常组合及其外围找矿预测应用 被引量:1
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作者 王进寿 安永尉 +4 位作者 李鹏 朱传宝 王莎 王建国 周豪 《矿产勘查》 2023年第4期608-615,共8页
Au-As-Sb地球化学异常组合在中低温热液型金矿床中常指示着矿体前缘晕相或中浅部矿体的出露,对剥蚀较弱的金矿床而言,该组合化探异常有利于指引造山型金矿床浅部金矿体的发现。不同于传统化探需测试数十个元素、处理上万个数据而圈定异... Au-As-Sb地球化学异常组合在中低温热液型金矿床中常指示着矿体前缘晕相或中浅部矿体的出露,对剥蚀较弱的金矿床而言,该组合化探异常有利于指引造山型金矿床浅部金矿体的发现。不同于传统化探需测试数十个元素、处理上万个数据而圈定异常的惯例,在柴北缘成矿带滩间山金矿区及外围水系沉积物研究中,采用Au-As-Sb元素组合特征分析方法圈定多个Au-As-Sb地球化学异常组合,大幅提高了水系沉积物勘查的工作效率。同时,R型聚类分析表明Au、As、Sb元素之间相关性强,与已发现的青龙沟、金龙沟大型造山型金矿床地质特征、主成矿期自然金+黄铁矿+毒砂+(黄铜矿+方铅矿+闪锌矿)矿石矿物组合、造山型金矿床连续成矿模型Au、As、Sb纵向变化规律等特点基本一致,表明该地区矿床赋存深度处于中浅成,预示着该矿床外围和深部具有较好找矿前景。 展开更多
关键词 au-As-sb组合 中低温热液型 成矿预测 滩间山金矿外围 柴北缘
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豫西熊耳山蒿坪沟Ag-Au-Pb-Zn多金属矿床闪锌矿矿物学和微量元素组成特征及其成矿启示 被引量:1
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作者 刘金波 张德贤 +2 位作者 胡子奇 陈绍炜 谢小雨 《现代地质》 CAS CSCD 北大核心 2024年第1期198-213,共16页
蒿坪沟银金铅锌多金属矿床是豫西熊耳山地区重要的铅锌多金属矿床之一,矿体主要赋存在蚀变破碎带和断裂带内,成矿与区内岩浆活动关系密切。目前该矿床的研究集中于同位素地球化学、成矿时代和成矿物质来源等方面,但从矿物角度示踪成矿... 蒿坪沟银金铅锌多金属矿床是豫西熊耳山地区重要的铅锌多金属矿床之一,矿体主要赋存在蚀变破碎带和断裂带内,成矿与区内岩浆活动关系密切。目前该矿床的研究集中于同位素地球化学、成矿时代和成矿物质来源等方面,但从矿物角度示踪成矿过程的报道较少。本文以矿石中不同世代闪锌矿为研究对象,开展电子探针和LA-ICP-MS原位主微量元素分析,查明不同世代闪锌矿的矿物学和微量元素组成特征,以反演矿床成矿物理化学条件进而约束矿床成因类型。结果表明,该矿床中闪锌矿主要存在两个世代:第一世代闪锌矿(Sp1)呈黑褐色或浅褐色,常与黄铁矿和黄铜矿共生,相对富集Fe、Mn、Cd、Cu和In;第二世代闪锌矿(Sp2)呈黄褐色或暗褐色,与大量方铅矿共生,裂隙被它形黄铁矿和碳酸盐充填,相对富集Co、Ge、Sn和Pb。闪锌矿中主要富集的元素为Fe、Co和In,其中Fe、Mn、Cd、Co和In等元素基本是以类质同象的形式赋存在闪锌矿的矿物晶格中,而Ag、Sb、Cu和Pb可能是以子矿物或显微包裹体的形式赋存。此外,Zn/Cd、Zn/Fe和Ga/In比值以及Fe温度计指示闪锌矿形成于中低温(沉淀时流体温度为229~259℃)和低硫逸度(lgƒ(S_(2))=-12.0~-10.1)的环境下,由成矿阶段II(Sp1到成矿阶段Ⅲ(Sp2其成矿温度可能发生了显著变化,结合面扫描分析结果,指示闪锌矿从核部到边缘温度逐渐降低。通过与国内外典型铅锌矿床闪锌矿微量元素特征对比,结合本矿床闪锌矿中低的Ga/In和Ge/In比值及Ge含量的特征,指示蒿坪沟银金铅锌多金属矿床成矿过程有岩浆活动的参与。综合认为蒿坪沟银金铅锌多金属矿床可能属于岩浆期后热液蚀变岩型和脉型矿床。 展开更多
关键词 蒿坪沟银金铅锌多金属矿床 闪锌矿微量元素 LA-ICP-MS 面扫描 矿床成因
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Study on the evolution of ore-formation fluids for Au-Sb ore deposits and the mechanism of Au-Sb paragenesis and differentiation in the southwestern part of Guizhou Province, China 被引量:10
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作者 WANG Zepeng XIA Yong +3 位作者 SONG Xieyan LIU Jianzhong YANG Chengfu YAN Baowen 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2013年第1期56-68,共13页
Ore deposits (occurrences) of Au, As, Sb, Hg, etc. distributed in Southwest Guizhou constitute the important portion of the low-temperature metallogenic domain covering a large area in Southwest China, with the Carlin... Ore deposits (occurrences) of Au, As, Sb, Hg, etc. distributed in Southwest Guizhou constitute the important portion of the low-temperature metallogenic domain covering a large area in Southwest China, with the Carlin-type Au and Sb deposits being the most typical ones. In this paper the Au and Sb ore deposits are taken as the objects of study. Through the petrographic analysis, microthermomitric measurement and Raman spectrophic analysis of fluid inclusions in gangue minerals and research on the S and C isotopic compositions in the gold ore deposits we can reveal the sources of ore-forming materials and ore-forming fluids and the rules of ore fluid evolution. Ore deposits of Au, Sb, etc. are regionally classified as the products of ore fluid evolution, and their ore-forming materials and ore fluids were probably derived mainly from the deep interior of the Earth. Fluid inclusion studies have shown that the temperatures of Au mineralization are within the range of 170-361℃,the salinities are 0.35 wt%-8 wt% NaCl eq.; the temperatures of Sb mineralization are 129.4-214℃ and the salinities are 0.18 wt%- 3.23 wt% NaCl eq.; the ore-forming fluid temperatures and salinities tend to decrease progressively. In the early stage (Au metallogenic stage) the ore-forming fluids contained large amounts of volatile components such as CO2, CH4, N2 and H2S, belonging to the H2O-CO2-NaCl fluid system; in the late stage (Sb metallogenic stage) the ore-forming fluids belong to the Sb-bearing H2O-NaCl system. The primitive ore-forming fluids may have experienced at least two processes of immiscibility: (1) when early ore-bearing hydrothermal solutions passed through rock strata of larger porosity or fault broken zones, CO2, CH4, N2 would escape from them, followed by the release of pressure, resulting in pressure release and boiling of primitive homogenous fluids, thereafter giving rise to their phase separation, thus leading to Au unloading and mineralization; and (2) in the late stage (Sb metallogenic stage ) a large volume of meteoric water was involved in the ore-forming fluids, leading to fluid boiling as a result of their encounter, followed by the drop of fluid temperature. As a result, the dissolubility of Sb decreased so greatly that Sb was enriched and precipitated as ores. Due to differences in physic-chemical conditions between Au and Sb precipitates, Au and Sb were respectively precipitated in different structural positions, thus creating such a phenomenon of Au/Sb paragenesis and differentiation in space. 展开更多
关键词 成矿流体演化 中国西南地区 金锑矿床 分化 共生 贵州省 西南部 流体温度
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Gold and antimony metallogenic relations and ore-forming process of Qinglong Sb(Au) deposit in Youjiang basin, SW China: Sulfide trace elements and sulfur isotopes 被引量:10
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作者 Jun Chen Zhi-Long Huang +2 位作者 Rui-Dong Yang Li-Juan Du Ming-Yang Liao 《Geoscience Frontiers》 SCIE CAS CSCD 2021年第2期605-623,共19页
In the northwestern margin of the Youjiang basin(NWYB)in SW China,many Carlin-like gold deposits are highly antimony(Sb)-rich,and many vein-type Sb deposits contain much Au.These deposits have similar ages,host rocks,... In the northwestern margin of the Youjiang basin(NWYB)in SW China,many Carlin-like gold deposits are highly antimony(Sb)-rich,and many vein-type Sb deposits contain much Au.These deposits have similar ages,host rocks,ore-forming temperatures,ore-related alterations and ore mineral assemblages,but the Au and Sb metallogenic relations and their ore-forming process remain enigmatic.Here we investigate the large Qinglong Sb deposit in the NWYB,which has extensive sub-economic Au mineralization,and present a new metallogenic model based on in-situ trace elements(EPMA and LA-ICP-MS)and sulfur isotopes(NanoSIMS and fs-LA-MC-ICPMS)of the ore sulfides.At Qinglong,economic Sb ores contain coarse-grained stibnite,jasperoid quartz and fluorite,whilst the sub-economic Au–Sb ores comprise dominantly veined quartz,arsenian pyrite and fine-grained stibnite.Three generations of ore-related pyrite(Py1,Py2 and Py3)and two generations of stibnite(Stb1 and Stb2)are identified based on their texture,chemistry,and sulfur isotopes.The pre-ore Py1 is characterized by the lower ore element(Au,As,Sb,Cu and Ag)contents(mostly below the LA-ICP-MS detection limit)and Co/Ni ratios(average 0.31)than the ore-stage pyrites(Py2 and Py3),implying a sedimentary/diagenetic origin.The Py2 and Py3 have elevated ore element abundance(maximum As=6500 ppm,Au=22 ppm,Sb=6300 ppm,Cu=951 ppm,Ag=77 ppm)and Co/Ni ratios(average 1.84),and have positive As vs.Au–Sb–Cu–Ag correlations.Early-ore Stb1 has lower As(0.12–0.30 wt.%)than late-ore Stb2(0.91–1.20 wt.%).These features show that the progressive As enrichment in ore sulfides is accompanied by increasing Au,Sb,Cu and Ag with the hydrothermal evolution,thereby making As a good proxy for Au.As-rich,As-poor and As-free zones are identified via NanoSIMS mapping of the Au-bearing pyrite.The As-rich zones in the Qinglong Au-bearing pyrites(Py2 and Py3)and ore stibnites(Stb1 and Stb2)have narrowδ^(34)SH_(2)S ranges(-8.9‰to +4.1‰,average-3.1‰)and-2.9‰to +6.9‰,average + 1.3‰),respectively,indicating that the Au-rich and Sb-rich fluids may have had the same sulfur source.Published in-situ sulfur isotopic data of pyrite As-rich zones from other Carlin-like Au deposits(Shuiyindong,Taipingdong,Nayang,Getang and Lianhuashan)in the NWYB have similar ore-fluidδSH_(2)S values(-4.5‰to +6.7‰,average-0.6‰)to those of Qinglong.Therefore,we infer that the sulfur of both Au and Sb mineralization was derived from the same magmatic-related source(0±5‰)in the NWYB.Moreover,the core of pyrites(Py1)has variable S isotope fractionation(-18.9‰to +18.1‰,mostly +3‰to +12‰),suggesting that the higher-^(34)S H_(2)S was produced by bacterial sulfate reduction(BSR).The hydrothermal pyrite(Py2 and Py3)δ^(34)S values gradually decrease with increasing As concentrations,and ultimately,within the restricted range(-5‰to +5‰)in As-rich zones.This variation implies that the As-rich pyrite was formed through ongoing interactions of the magmatic-hydrothermal fluid with pre-existing sedimentary pyrites,causing the progressive decreasing δ^(34)S values with As content increase,Hence,the fluid/mineral interaction may have generated the observed variation in δ^(34)S and As contents.Overall,comparing the Au and Sb deposits in the NWYB,we favor a magmatic-related source for the Au–Sb–As-rich fluids,but the Au-and Sb-ore fluids were likely evolved at separate stages in the ore-forming system. 展开更多
关键词 Pyrite STIBNITE LA-ICP-MS and NanoSIMS Sulfur isotopes au and sb deposits Youjiang basin
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Geochemistry and geochronology of Late Jurassic and Early Cretaceous intrusions related to some Au(Sb) deposits in southern Anhui: a case study and review 被引量:1
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作者 Qing Hu Huangling Gu +3 位作者 Xiaoyong Yang Yisu Ren Ergen Gao Zhangxing Nie 《Acta Geochimica》 EI CAS CSCD 2018年第3期360-383,共24页
Some Au deposits in southern Anhui Province have recently been found to be closely associated with Late Mesozoic intrusions. Typical examples include the Huashan Au(Sb) deposit and Au deposits at Zhaojialing, Wuxi,and... Some Au deposits in southern Anhui Province have recently been found to be closely associated with Late Mesozoic intrusions. Typical examples include the Huashan Au(Sb) deposit and Au deposits at Zhaojialing, Wuxi,and Liaojia. In order to understand the mechanisms that led the formation of these Au deposits, we make detailed reviews on the geological characteristics of these Au deposits. Specifically, we present new LA-ICP-MS zircon U–Pb dating, along with elemental and Hf isotopic data from the Huashan Au(Sb) deposit. Our data suggests that the Huashan ore-related intrusions were emplaced during the Late Jurassic and Early Cretaceous periods(144–148 Ma). They are characterized by arc-magma features and high oxygen fugacity and are rich in inherited zircons. Zircon U–Pb ages and Lu–Hf isotopes from intrusions suggest that Proterozoic juvenile lithosphere is the main source of these intrusions. The regional geological history implies that lithosphere beneath southern Anhui was produced during a Proterozoic subduction and was fertilized with Au(Cu) in the process. Integrated with theresults of previous studies, we inferred that Late Mesozoic intrusions formed by the remelting of the lithosphere could provide the metal endowment for the Au-rich deposits in southern Anhui. 展开更多
关键词 Yanshannian magmatism Subduction-modified lithosphere au (sb) depositS SOUTHERN ANHUI South China
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镁铁质岩浆周期性补给对云南普朗斑岩Cu-Au矿床的制约:能量约束下热力学模拟
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作者 张少颖 和文言 肖仪武 《现代地质》 CAS CSCD 北大核心 2024年第4期922-933,共12页
镁铁质岩浆周期性补给于硅酸质岩浆房是形成大型斑岩矿床的关键因素。本文以普朗超大型斑岩Cu-Au矿床为例,通过能量约束体系下的热力学方法模拟浅部硅酸质岩浆房中镁铁质岩浆周期性补给过程,定量评估该过程对形成大型斑岩矿床的控制作... 镁铁质岩浆周期性补给于硅酸质岩浆房是形成大型斑岩矿床的关键因素。本文以普朗超大型斑岩Cu-Au矿床为例,通过能量约束体系下的热力学方法模拟浅部硅酸质岩浆房中镁铁质岩浆周期性补给过程,定量评估该过程对形成大型斑岩矿床的控制作用。普朗矿床成矿前粗粒石英闪长玢岩(CQD)和成矿期石英二长斑岩(QMP)复式岩体中均普遍发育镁铁质暗色微粒包体(MMEs),岩相学特征显示斑岩体中角闪石和黑云母发育韵律环带结构或港湾状溶蚀结构以及针柱状磷灰石的存在均指示发生了镁铁质岩浆混合作用。与单一的分离结晶模型(FC)相比,多阶段岩浆补给-分离结晶模型(R3FC)显示,镁铁质岩浆的补给一方面会抑制长石的结晶,另一方面会促进钙铁镁和铁镁等多类型角闪石的形成,并大幅提前黑云母的结晶次序。以硅酸质岩浆物质摩尔分数变化与挥发分之间相关性为参照,获得的熔体H_(2) O、SCSS(硫化物饱和时硅酸盐熔体中的S含量)和Cl溶解度显示,镁铁质岩浆补给将在岩浆演化早期提高而在晚期降低残余熔体H_(2)O含量(0.16%、0.04%、-0.30%),持续提高熔体SCSS(78.74×10^(-6)、94.44×10^(-6)和137.88×10^(-6))和Cl溶解度(0.04%、0.10%和0.20%),但对Cu含量影响有限。结果表明,能量约束体系下的R3FC和FC热力学模型不仅能够合理解释普朗复式斑岩体矿物结构特征,也定量验证了镁铁质岩浆的补给对成矿岩体异常高H_(2) O、S和Cl含量的贡献。 展开更多
关键词 岩浆混合 热力学模拟 挥发分 普朗斑岩Cu-au矿床
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A STUDY ON THE GEOLOGICAL FEATURES AND GENESIS OF THE LONGSHAN Au-Sb DEPOSIT 被引量:1
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作者 HU Xiang zhao and YANG Zhong bao(Dept. of Geology, Central South Univ., Changsha 410083, China) 《Geotectonica et Metallogenia》 2002年第1期82-88,共7页
The geological features of the Longshan Au Sb deposits are systematically described. Mineralization conditions, sources of ore materials and metallogenetic mechanism are also analysed according to sulfur,oxygen isotop... The geological features of the Longshan Au Sb deposits are systematically described. Mineralization conditions, sources of ore materials and metallogenetic mechanism are also analysed according to sulfur,oxygen isotope composition, pyrite typomorphic features and fluid inclusion thermometry dating, The results show that it is a sedimentary metamophic hydrothermal deposit. 展开更多
关键词 GEOLOGICAL FEATURE au-deposit GENESIS Longshan
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STUDY ON THE FAULT TECTONIC-METALLOGENETIC MECHANISM OF W-Sb-Au TYPE GOLD DEPOSITS
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《Geotectonica et Metallogenia》 1994年第Z2期78-78,共1页
关键词 sb STUDY ON THE FauLT TECTONIC-METALLOGENETIC MECHANISM OF W-sb-au TYPE GOLD depositS
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Geological, Alteration and Mineralization Characteristics of Ali Javad Porphyry Cu-Au Deposit, Arasbaran Zone, NW Iran
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作者 Behzad Hajalilou Mehraj Aghazadeh 《Open Journal of Geology》 2016年第8期859-874,共17页
Ali Javad porphyry Cu-Au deposit is located 20 Km north of Ahar city in Arasbaran metallogenic zone which is considered as a part of Alp-Himalayan mineralization belt. Magmatism in this area began in Late Cretaceous, ... Ali Javad porphyry Cu-Au deposit is located 20 Km north of Ahar city in Arasbaran metallogenic zone which is considered as a part of Alp-Himalayan mineralization belt. Magmatism in this area began in Late Cretaceous, followed by extensive magmatism in Cenozoic and Quaternary periods. Porphyry type mineralization developed in Ali Javad quartz monzonitic porphyry stock and Eocene pyroclastic and volcanic country rocks. Ali Javad porphyry intrusion has shoshonitic nature and shows characteristics of volcanic arc granitoids that it is have been emplaced in a post-collision tectonic setting. Alteration zones at the deposit demonstrated zoning which is comparable with Lowel-Guilbert model proposed for quartz-monzonite type porphyry copper deposits. Phyllic, argillic, silicic and propylitic alteration zones were observed at the surface while potassic alteration zone could be observed at depth in drill core samples. Mineralization was recognized both as supergene and hypogene, the latter was as veins, veinlets and disseminations. Dominant hypogene minerals were chalcopyrite, bornite, molybdenite, pyrite and magnetite while chalcocite, covellite and limonite were dominant supergene minerals. Four mineralization zones were observed in the deposit as leached, transitional, supergene and hypogene zones. Average grades were 0.75% for copper and 1.86 ppm for gold with 81.5 Mt proved reserve for copper and 37.8 Mt for gold. 展开更多
关键词 GEOLOGY ALTERATION MINERALIZATION Ali Javad Porphyry Cu-au deposit Iran
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湖南沃溪W-Sb-Au矿床成因的流体包裹体证据 被引量:16
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作者 董树义 顾雪祥 +4 位作者 Oskar Schulz Franz Vavtar 刘建明 郑明华 程文斌 《地质学报》 EI CAS CSCD 北大核心 2008年第5期641-647,共7页
系统研究了沃溪W-Sb-Au矿床层状矿体的流体包裹体特征,均一温度集中在120~180℃,盐度变化于2.9%~8.9%NaCl之间,由包裹体均一温度与盐度计算得出的流体密度介于0.94~0.96g/cm^3。流体包裹体稀土元素地球化学组成表明,成矿流体为一种... 系统研究了沃溪W-Sb-Au矿床层状矿体的流体包裹体特征,均一温度集中在120~180℃,盐度变化于2.9%~8.9%NaCl之间,由包裹体均一温度与盐度计算得出的流体密度介于0.94~0.96g/cm^3。流体包裹体稀土元素地球化学组成表明,成矿流体为一种进化的海水,即海水在海底下沉积柱循环过程中萃取矿质,形成120~180℃温度的低密度成矿流体。当其回返上升到海底后,形成悬浮热液柱,并与冷海水逐渐掺和,发生化学和机械-化学沉积,在海底形成层状矿体。流体包裹体均一温度和盐度的变化范围与很多沉积喷流(SEDEX)矿床极为相似,暗示与这些矿床具有相似的成因机制。同一矿层、条带状矿石中同一条带的石英中包裹体均一温度和盐度的规律性变化,支持沃溪W-Sb-Au矿床的同生热水沉积成因观点。 展开更多
关键词 流体包裹体 悬浮热液柱 热水沉积 W-sb-au矿床 沃溪 湖南省
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湘西沃溪Au-Sb-W矿床中富放射成因锶的成矿流体及其指示意义 被引量:19
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作者 彭建堂 胡瑞忠 +1 位作者 赵军红 符亚洲 《矿物岩石地球化学通报》 CAS CSCD 2003年第3期193-196,共4页
研究表明 ,湘西沃溪Au Sb W矿床白钨矿的Sr含量很高 ,为 14 5 5~ 6 810 μg g ;87Sr/ 86 Sr为 0 .74 6 75~0 .75 0 0 3,明显不同于国外金矿中的白钨矿 ,表现出显著富放射成因锶。沃溪矿床的成矿流体为一种显著富放射成因锶的热水溶液 ... 研究表明 ,湘西沃溪Au Sb W矿床白钨矿的Sr含量很高 ,为 14 5 5~ 6 810 μg g ;87Sr/ 86 Sr为 0 .74 6 75~0 .75 0 0 3,明显不同于国外金矿中的白钨矿 ,表现出显著富放射成因锶。沃溪矿床的成矿流体为一种显著富放射成因锶的热水溶液 ,暗示成矿流体不可能是类似于现代大洋中脊喷出的热液或古海水 ,其矿床成因并非前人所认为的“海底热泉 (卤水 )沉积成因”或“海底喷流沉积成因”。矿床中这种显著富放射成因锶的成矿流体 ,很可能是热水溶液对下伏古老基底淋滤或是对元古界赋矿地层中的碎屑岩选择性优先淋滤所致。 展开更多
关键词 沃溪ausb—W矿床 成矿流体 富放射成因锶 白钨矿 金矿床 湖南 地质特征 矿床成因
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湘西沃溪W-Sb-Au矿床白钨矿Nd-Sr-Pb同位素对成矿流体的示踪 被引量:42
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作者 彭渤 Robert FREI 涂湘林 《地质学报》 EI CAS CSCD 北大核心 2006年第4期561-570,共10页
本文对湘西沃溪W-Sb-Au矿床白钨矿进行了系统的Nd—Sr—Pb同位素分析。结果表明,白钨矿的Sm、Nd含量较低,^147Sm/^144Nd(0.64~1.27)值和Sm/Nd值(1.11~2.22)变化较大,其εNd(t=199Ma)值也很低,平均为-25.5(n=9);... 本文对湘西沃溪W-Sb-Au矿床白钨矿进行了系统的Nd—Sr—Pb同位素分析。结果表明,白钨矿的Sm、Nd含量较低,^147Sm/^144Nd(0.64~1.27)值和Sm/Nd值(1.11~2.22)变化较大,其εNd(t=199Ma)值也很低,平均为-25.5(n=9);白钨矿的^87Sr/ε84Sr值(0.7476~0.7504)高,平均为0.74961(n=11),代表白钨矿形成时的初始^87Sr/^86Sr(t=199Ma)值;逐级分离Pb同位素分析结果显示白钨矿的^206Pb/^204Pb、^207Pb/^204Pb、^208Pb/^204Pb值变化范围小,平均依次分别为18.11、15.61、38.6,与含金石英脉中黄铁矿、蚀变围岩及区域板溪群板岩等的相应Pb同位素比值基本一致。白钨矿Nd—Sr—Pb同位素组成和闪锌矿等其他矿物的Sr同位素特征指示成矿流体来自:板溪群下伏成熟陆壳、深部花岗质岩浆、浅部赋矿围岩等源区。成矿流体是这些来自不同源区的流体相作用而形成的混合流体。成矿作用则是这些不同源区的流体混合作用并演化的结果。且成矿流体演化早期是来自下伏成熟陆壳的流体与来自赋矿围岩的流体混合,导致早期W成矿;晚期是来自深部花岗质岩浆的流体与浅部赋矿围岩的流体混合作用,导致晚期Sb—Au成矿。W—Sb—Au成矿则是中生代陆内碰撞造山体制下不同期次的流体演化和叠加作用的结果。 展开更多
关键词 Nd—Sr—Pb同位素示踪 白钨矿 成矿流体 W—sbau矿床 湘西沃溪
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贵州开阳磷矿地区下寒武统牛蹄塘组地层层序及其As、Sb、Au、Ag丰度异常与赋存状态研究 被引量:8
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作者 张岳 颜丹平 +3 位作者 赵非 李旭拓 邱亮 张翼西 《岩石学报》 SCIE EI CAS CSCD 北大核心 2016年第11期3252-3268,共17页
贵州开阳磷矿地区出露较为完整的下寒武统黑色岩系层序,这套黑色岩系中富含多种金属元素,但目前对岩系中主要低温成矿元素As、Sb、Au、Ag的地球化学背景异常与分布规律了解极少,对其形成背景与赋存状态无法进行深入讨论。本文以开阳磷... 贵州开阳磷矿地区出露较为完整的下寒武统黑色岩系层序,这套黑色岩系中富含多种金属元素,但目前对岩系中主要低温成矿元素As、Sb、Au、Ag的地球化学背景异常与分布规律了解极少,对其形成背景与赋存状态无法进行深入讨论。本文以开阳磷矿地区下寒武统牛蹄塘组黑色岩系剖面作为研究对象,通过详细的野外地质调查、系统采样并进行地球化学分析、全岩硫同位素分析及黄铁矿电子探针分析,划分了详细的牛蹄塘组地层层序,对主要低温成矿元素(As、Sb、Au、Ag)的丰度异常、富集特征及赋存状态进行了研究,结果表明,黑色岩系中普遍富集As、Sb、Ag三种主要低温成矿元素,Au也在大部分层位富集。四种元素具有层控性的特点,在牛蹄塘组下部有机质含量较高的黑色白云质粉砂质页岩和黑色页岩层位中具有较高的元素丰度异常,在泥岩和粉砂岩混合层位元素丰度异常较低,钙质成分含量较高的层位元素含量较低。黄铁矿是黑色页岩中金的主要赋存矿物,也是Sb的重要赋存矿物,同时是Ag和As的次要赋存矿物;不同类型的黄铁矿,元素富集规律也不相同:As、Ag更容易富集在不规则集合体和草莓状黄铁矿中,Sb和Au则在散布的单颗粒黄铁矿中富集系数最高。 展开更多
关键词 牛蹄塘组 地层层序 AS sb au AG 丰度异常 赋存状态
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湘中龙山Au-Sb矿床成矿物质来源——来自S、Pb和Sr同位素证据 被引量:3
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作者 蔡应雄 杨红梅 +4 位作者 邱啸飞 梅玉萍 童喜润 谭娟娟 刘重芃 《地质学报》 EI CAS CSCD 北大核心 2020年第8期2311-2324,共14页
龙山Au-Sb矿床是湘中Au、Sb矿集区的代表性矿床,本文对其不同类型矿石、矿区围岩和区域地层进行了S、Pb、Sr同位素组成对比研究。矿石中硫化物的δ34S值为-3.0‰~5.1‰,平均值2.3‰;矿区围岩的δ34S值为4.0‰~5.9‰,平均值5.2‰;区域地... 龙山Au-Sb矿床是湘中Au、Sb矿集区的代表性矿床,本文对其不同类型矿石、矿区围岩和区域地层进行了S、Pb、Sr同位素组成对比研究。矿石中硫化物的δ34S值为-3.0‰~5.1‰,平均值2.3‰;矿区围岩的δ34S值为4.0‰~5.9‰,平均值5.2‰;区域地层的δ34S值为9.3‰~13.3‰,平均值11.3‰。矿石与矿区围岩、区域地层的硫同位素组成差别较大,矿石硫具岩浆来源特征。矿石中硫化物的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为16.992~18.457、15.392~15.722和37.586~38.960,矿区围岩的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为17.630~17.993、15.522~15.644和37.981~38.366;区域地层的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为17.566~18.092、15.430~15.630和37.988~38.710。矿石铅同位素组成变化较大,矿石铅的来源较复杂,赋矿地层、印支期岩浆岩和上地幔可能都为其提供了部分铅。石英流体包裹体的(87Sr/86Sr)i比值为0.71540~0.72309,矿区围岩的(87Sr/86Sr)i比值为0.71844~0.72153,区域地层的(87Sr/86Sr)i比值为0.71792~0.71939,矿石、矿区围岩、区域地层的初始锶同位素值均较高,主要为壳源锶,部分锶来自赋矿地层,部分来自印支期岩浆岩。龙山矿床成矿物质具壳幔混合来源特征,矿化剂硫主要来源于岩浆,成矿物质部分来自江口组地层,部分来自印支期岩浆岩。 展开更多
关键词 S同位素 PB同位素 SR同位素 成矿物质来源 湘中龙山
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扬子地块西南缘低温成矿域Au、Sb、Hg、As矿床区域分布上的共生分异及控制因素 被引量:6
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作者 孙国胜 胡瑞忠 +2 位作者 苏文超 王国芝 朱赖民 《地质地球化学》 CAS CSCD 2003年第4期50-55,共6页
扬子地块西南缘大面积低温成矿域的Au、Sb、Hg、As矿床,常出现共生分异的现象,在空间上形成Au、Sb、Hg、As矿床、矿带相伴出现而又相对独立的规律性分布。在详细研究Au、Sb、Hg、As矿床、矿带区域分布及其产出地质背景的基础上,从不同... 扬子地块西南缘大面积低温成矿域的Au、Sb、Hg、As矿床,常出现共生分异的现象,在空间上形成Au、Sb、Hg、As矿床、矿带相伴出现而又相对独立的规律性分布。在详细研究Au、Sb、Hg、As矿床、矿带区域分布及其产出地质背景的基础上,从不同的角度,对制约Au、Sb、Hg、As矿床、矿带共生分异的因素进行了探讨。 展开更多
关键词 低温成矿域 共生分异 控制因素 扬子地块西南缘
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Sb在Au电极上不可逆吸附的电化学过程(英文) 被引量:2
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作者 吴启辉 甄春花 +1 位作者 周志有 孙世刚 《物理化学学报》 SCIE CAS CSCD 北大核心 2008年第2期201-204,共4页
用电化学循环伏安法和电化学石英晶体微天平(EQCM)技术研究了Sb在Au电极上不可逆吸附的电化学过程.研究结果表明,在-0.25V到0.18V(vs SCE)范围内,Sb可在Au电极上稳定吸附,并且在0.15V附近出现特征氧化还原峰.根据EQCM实验数据,在电位0.... 用电化学循环伏安法和电化学石英晶体微天平(EQCM)技术研究了Sb在Au电极上不可逆吸附的电化学过程.研究结果表明,在-0.25V到0.18V(vs SCE)范围内,Sb可在Au电极上稳定吸附,并且在0.15V附近出现特征氧化还原峰.根据EQCM实验数据,在电位0.18V时,Sb在Au电极上的氧化产物是Sb2O3;同时Sb的吸附阻止了电解液中阴离子和水在Au电极上的吸附.当电极电位超过0.20V时,Sb2O3会被进一步氧化成Sb5+化合物,同时逐渐从Au电极表面脱附. 展开更多
关键词 电化学石英晶体微天平 sb吸附 au电极
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Sb在Au单晶电极上结构敏感吸附行为的比较 被引量:1
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作者 颜佳伟 商旺火 +1 位作者 吴琼 毛秉伟 《电化学》 CAS CSCD 北大核心 2005年第2期140-145,共6页
本文研究比较Sb(III)在Au(111)和Au(100)电极上的不可逆吸附与还原和Sb的欠电位沉积行为及其相互影响.现场扫描隧道显微镜和循环伏安法测试结果表明,基底表面结构不仅影响阴离子的吸附行为和Sb的吸附结构,而且还影响其自身结构的稳定性.... 本文研究比较Sb(III)在Au(111)和Au(100)电极上的不可逆吸附与还原和Sb的欠电位沉积行为及其相互影响.现场扫描隧道显微镜和循环伏安法测试结果表明,基底表面结构不仅影响阴离子的吸附行为和Sb的吸附结构,而且还影响其自身结构的稳定性.在Au(111)表面,致密无序膜的SbO+不可逆吸附层还原后基本保持原有的无序结构;而在Au(100)表面,由于SO42-的共吸附,不可逆吸附物种还原后形成(2×2)有序结构.在Au(111)表面上,Sb的欠电位沉积伴随显著的合金化,且因表面有序结构的破坏而形成沟道状二维结构;但对Au(100)表面,由于其晶格和尺寸与稳定的AuSb2合金之(100)面有较好的匹配性,使Au与Sb得以形成有序的表面化合物,从而避免了欠电位沉积过程中的表面合金化问题,进一步体现基底结构的敏感性和重要性. 展开更多
关键词 吸附行为 电极 au 扫描隧道显微镜 单晶 SO4^2- 有序结构 循环伏安法 不可逆吸附 sb(Ⅲ) 欠电位沉积 表面合金化 相互影响 沉积行为 吸附结构 表面结构 无序结构 吸附物种 二维结构 沉积过程 基底结构 还原 阴离子 稳定性
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湘西沃溪钨锑金矿床黄铁矿中发现Au-Sb矿物相 被引量:3
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作者 彭渤 Adam Piestrzynski +1 位作者 刘升友 Jadwiga Pieczonka 《地质通报》 CAS CSCD 北大核心 2007年第5期553-559,共7页
利用扫描电镜和电子探针等方法,对沃溪钨锑金矿床中产于(块状白钨矿-石英脉中的)黄铁矿微裂隙中的自然金和Au-Sb矿物相进行了较详细的观察和研究。结果表明,黄铁矿中Au-Sb矿物相除了有前人已经鉴定出的方锑金矿(AuSb2.13)外,还新发现有... 利用扫描电镜和电子探针等方法,对沃溪钨锑金矿床中产于(块状白钨矿-石英脉中的)黄铁矿微裂隙中的自然金和Au-Sb矿物相进行了较详细的观察和研究。结果表明,黄铁矿中Au-Sb矿物相除了有前人已经鉴定出的方锑金矿(AuSb2.13)外,还新发现有锑金矿(Au1.02Sb)矿物相。二者以显微颗粒的形式存在于黄铁矿显微裂隙中。黄铁矿微裂隙中Au-Sb矿物相的存在,指示矿床成矿在黄铁矿形成之后存在Au-Sb混溶的成矿流体。自然金、方锑金矿、锑金矿等矿物的沉淀析出可能是Au-Sb混溶流体从高温(高于350℃)向低温(250℃)演变的结果。此外,Au-Sb矿物相的发现对改进矿石冶炼中Au、Sb的分离技术有参考价值。 展开更多
关键词 ausb矿物相 方锑金矿 锑金矿 钨锑金矿床 湘西沃溪
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