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Fluid Inclusion Petrography and Microthermometry of Zn and Pb Deposits of Rajpura-Dariba Bethumni Belt, Udaipur District (Rajasthan), India
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作者 Juned Alam Farhat Nasim Siddiquie 《International Journal of Geosciences》 2015年第3期256-273,共18页
The Proterozoic Aravalli-Delhi orogenic complex hosts a large number of economically important stratabound base metal sulphide deposits. In the present work, rock samples taken from Outcrop and Underground Mine of Sin... The Proterozoic Aravalli-Delhi orogenic complex hosts a large number of economically important stratabound base metal sulphide deposits. In the present work, rock samples taken from Outcrop and Underground Mine of Sindeskar Kalan, Vedanta Group, Rajpura Dariba-Bethumni Belt which is located at a distance of 76 kms from Udaipur city, Rajasthan have been studied. The chief litho units of the group which contain sulfide-bearing calc-silicate and graphite mica schist, dolomite marble, calc-biotite schist and quartzite are identified. An attempt has also been made to study/or hydrothermal in origin in the different types of fluid inclusions, hosted predominately in Geothermometry viz. heating and freezing study of entrapped palaeo-fluids (such as sedimentary and quartz host grain and a few in sphalerites). The quartz hosts are identified with four types of fluid inclusions, such as 1) monophase (gas/vapour), 2) gas-rich biphase, 3) liquid-rich biphase and 4) polyphase types. The primary types of fluid inclusions show that melting temperature of ice or depression freezing point (DFP) (ranging from -2.5°C to -7.2°C)/(salinity ranging from 4.5 - 13.25 wt% NaCl eq.) and temperature of homogenization into liquid phase (ranging from +188°C to +218°C) have been measured. Data from the fluid inclusions and salinity calculation (low salinity) reveal that rate of cooling is the important mechanism of ore deposition in the study area. 展开更多
关键词 SPHALERITE Quartz fluid inclusionS petrography and microthermometry Rajpura
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Cu-Bearing Mokama Granite Prospect of the Kibara Belt in the Maniema Province, DRC: A Preliminary Petrography, Geochemistry, and Fluid Inclusion Study
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作者 Douxdoux Kumakele Makutu Ivan Bongwe +3 位作者 Chris Musomo Mfumu Frederick Makoka Mwanza Jean-Pierre Bulambo Pierre Kambuli Kaseti 《Open Journal of Geology》 2023年第10期1007-1023,共17页
The Mokama granites are located in the Kibara belt (KIB) and hosts tin oxide group minerals (TOGM: Sn-W), and sulfide group minerals (SGM: Cu-Zn-Fe-As). The essential of Cu mineralization (non-economic deposit) is dis... The Mokama granites are located in the Kibara belt (KIB) and hosts tin oxide group minerals (TOGM: Sn-W), and sulfide group minerals (SGM: Cu-Zn-Fe-As). The essential of Cu mineralization (non-economic deposit) is disseminated inside the rock and consists of minerals (Raman, EPMA and metallographic microscopy) including chalcopyrite and bornite that are replaced by chalcocite and covellite, and the last also replaced later by malachite. The chemistry (XRF, LA-ICP-MS) of these peraluminous S-type leucogranites show SiO<sub>2</sub> (71 wt% - 79 wt%), ASI (1.4 - 3.1 molar), and are enriched in Rb (681 - 1000 ppm), Ta (12–151 ppm), Sn (43 - 142 ppm), Cu (10 - 4300 ppm), Zn (60 - 740 ppm), U (2.2 - 20.7 ppm) while depleted in Zr (20 - 31 ppm), Sr (20 - 69 ppm), Hf (1.3 - 2.0 ppm), Th (2.2 - 18.9 ppm), W (9 - 113 ppm), Pb (5 - 50 ppm), Ge (5 - 10 ppm), Cs (21 - 53 ppm) and Bi (0.6 - 17.4 ppm) and low ratios of (La/Yb) N, (Gd/Yb) N, (La/Sm) N). Fluid inclusion assemblages (FIAs) hosted in quartz in the Mokama granites show ranges of salinities of 4 - 23 wt% (NaCl equivalent) and homogenization temperatures (Th) of 190°C - 550°C. A boiling assemblage in the granite suggests a fluid phase separation occurred at about 380 - 610 bars, and this corresponds to apparent paleodepths of approximately 1 - 2 km (lithostatic model) or 3 - 5 km (hydrostatic model). FIAs hosted in TOGM such as cassiterite (salinities of 2 wt% - 10 wt% and Th of 220°C - 340°C) helped set up the possible temperature limit of SGM (Cu sulfide) precipitations that are estimated below 200°C. 展开更多
关键词 Mokama Granites petrography GEOCHEMISTRY Cu-Mineralization XRF EPMA LA-ICP-MS fluid inclusion microthermometry
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人工合成包裹体的实验研究及其在激光拉曼探针测定方面的应用 被引量:40
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作者 倪培 饶冰 +1 位作者 丁俊英 张林松 《岩石学报》 SCIE EI CAS CSCD 北大核心 2003年第2期319-326,共8页
利用愈合人工水晶裂隙合成人工流体包裹体的技术,在0.5~1kb,350~800℃的范围内,对纯H_2O体系、NaCl-H_2O体系、KCl-H_2O体系进行了人工合成包裹体实验研究。并对这些合成的包裹体进行了详细的测温学研究,证实了合成包裹体是母液成分... 利用愈合人工水晶裂隙合成人工流体包裹体的技术,在0.5~1kb,350~800℃的范围内,对纯H_2O体系、NaCl-H_2O体系、KCl-H_2O体系进行了人工合成包裹体实验研究。并对这些合成的包裹体进行了详细的测温学研究,证实了合成包裹体是母液成分的真实代表,完全可以用来做为自然界包裹体研究的标样。同时利用合成包裹体采集了均一、和冷冻状态下的拉曼谱,讨论了合成包裹体在激光拉曼探针测定方面的某些可能的应用。研究表明,合成包裹体是了解包裹体的形成机理和进行地质流体性质研究的一种十分有效的手段,在地质流体和实验地球化学研究领域有着广阔的应用前景。 展开更多
关键词 人工合成包裹体 岩相学和显微测温 激光拉曼
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CaCl_2-H_2O体系人工合成流体包裹体研究 被引量:14
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作者 丁俊英 倪培 饶冰 《岩石学报》 SCIE EI CAS CSCD 北大核心 2005年第5期1425-1428,共4页
人工合成包裹体可以作为天然包裹体参照物,提高我们对天然包裹体各种形成作用的认识,并用来模拟天然包裹体以验证许多涉及流体包裹体研究假设的有效性。本文利用人工水晶裂隙愈合方式,在一定的温压条件下合成了具有特定组成的 CaCl_2-H_... 人工合成包裹体可以作为天然包裹体参照物,提高我们对天然包裹体各种形成作用的认识,并用来模拟天然包裹体以验证许多涉及流体包裹体研究假设的有效性。本文利用人工水晶裂隙愈合方式,在一定的温压条件下合成了具有特定组成的 CaCl_2-H_2O 体系流体包裹体,并对这些合成的包裹体样品进行了详细的测温学研究,结合倪培等(2003)研究结果,进一步证实了:人工合成包裹体与天然包裹体的相似性,以及流体包裹体中捕获流体是母溶液的真实代表性。因此,合成包裹体作为天然包裹体参照物,将在流体包裹体和地质流体研究领域具有十分广阔的应用前景。 展开更多
关键词 人工合成包裹体 岩相学 显微测温
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NaCl-CaCl_2-H_2O体系人工合成流体包裹体及其冷冻后的熔融行为研究 被引量:8
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作者 丁俊英 倪培 《岩石学报》 SCIE EI CAS CSCD 北大核心 2007年第9期2039-2044,共6页
在倪培等在2003年和丁俊英等在2005年成功开展人工合成包裹体研究的基础上,利用愈合人工水晶裂隙技术,在设定的实验条件下合成了 NaCl-CaCl_2-H_2O 体系的流体包裹体。对合成的包裹体进行了岩相学观察,显微测温工作,并结合相应相图分析... 在倪培等在2003年和丁俊英等在2005年成功开展人工合成包裹体研究的基础上,利用愈合人工水晶裂隙技术,在设定的实验条件下合成了 NaCl-CaCl_2-H_2O 体系的流体包裹体。对合成的包裹体进行了岩相学观察,显微测温工作,并结合相应相图分析研究——主要对合成包襄体的低温熔融行为进行探讨。结果表明合成的包裹体捕获了既定组成的流体,其低温相变过程与相应相图吻合。因此,人工合成流体包裹体与天然包裹体相似,天然流体包襄体的各种行为可以参照人工合成流体包裹体;同时,通过人工合成流体包裹体校正补充实验相图,使其更准确的被应用于天然包襄体测定分析。 展开更多
关键词 人工合成包裹体 岩相学 低温相变
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