| Study on the Physical and Chemical Conditions of Ore Formation of Hetai Ductile Shear Zone—Hosted Gold Deposit and Discovery of Melt Inclusions |
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| 引用本文： | 李兆麟,翟伟,李文,石贵勇,文拥军.Study on the Physical and Chemical Conditions of Ore Formation of Hetai Ductile Shear Zone—Hosted Gold Deposit and Discovery of Melt Inclusions[J].中国地球化学学报,2002,21(1):40-51. |
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| 作者姓名： | 李兆麟 翟伟 李文 石贵勇 文拥军 |
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| 作者单位： | 李兆麟,李文,石贵勇,文拥军(Department of Earth Sciences, Zhongshan University, Guangzhou 510275, China);翟伟(Department of Earth Sciences, Zhongshan University, Guangzhou 510275, China;State Laboratory of Metallogenesis, Nanjing University, Nanjing 210093, China) |
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| 基金项目： | 国家自然科学基金，the State Key Laboratory for Mineral Deposits Research |
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| 摘 要： | The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic rock series. In this study there have been discovered melt inclusions, fluid-melt inclusions and organic inclusions in ore-bearing quartz veins of the ore deposit and mylonite for the first time. The homogenization temperatures of the various types of inclusions are 160℃, 180 - 350℃, 530℃ and 870℃ for organic inclusions, liquid inclusions, two-phase immiscible liquid inclusions and melt inclusions, respectively. Ore fluid is categorized as the neutral to basic K+ -Ca2+ -Mg2+ -Na+ - SO2- 4-HCO3-Cl- system. The contents of trace gases follow a descending order of H2O＞CO2＞CH4＞(or ＜ ) H2＞CO＞C2H2＞C2I-I6＞O2＞N2.The concentrations of K , Ca2 + ,SO2-4,HCO3-,Cl- H2O and C2H2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in ores from different levels of the gold deposit. This is significant for deep ore prospecting in the region. Daughter minerals in melt inclusions were analyzed using SEM. Quartz, orthoclase, wollastonite and other silicate minerals were identified. They were formed in different mineral assemblages.This analysis further proves the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form silicate melts during metamorphic anatexis and dynamic metamorphism, which possess melt-solution characteristics. Ore formation is related to the multi-stage forming process of silicate melt and fluid.
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| 关 键 词： | 热液交互作用 金矿床 物理化学条件 成矿带 成矿作用 |
Study on the physical and chemical conditions of ore formation of Hetai ductile shear zone-hosted gold deposit and discovery of melt inclusions |
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| Li?Zhaolin,Zhai?Wei,Li?Wen,Shi?Guiyong,Wen?Yongjun.Study on the physical and chemical conditions of ore formation of Hetai ductile shear zone-hosted gold deposit and discovery of melt inclusions[J].Chinese Journal of Geochemistry,2002,21(1):40-51. |
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| Authors: | Li Zhaolin Zhai Wei Li Wen Shi Guiyong Wen Yongjun |
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| Institution: | (1) Department of Earth Sciences, Zhongshan University, 510275 Guangzhou, China;(2) State Laboratory of Metallogenesis, Nanjing University, 210093 Nanjing, China |
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| Abstract: | The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic
rock series. In this study there have been discovered melt inclusions, fluid-melt inclusions and organic inclusions in ore-bearing
quartz veins of the ore deposit and mylonite for the first time. The homogenization temperatures of the various types of inclusions
are 160°C, 180 – 350°C, 530°C and 870°C for organic inclusions, liquid inclusions, two-phase immiscible liquid inclusions
and melt inclusions, respectively. Ore fluid is categorized as the neutral to basic K+-Ca2+-Mg2+ -Na+ − SO
4
2−
-HCO
3
−
-Cl− system. The contents of trace gases follow a descending order of H2O> CO2> CH4> (or < ) H2> CO> C2H2 > C2H6> O2>N2. The concentrations of K+, Ca2+, SO
4
2−
, HCO
3
−
,. Cl−, H2O and C2H2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in ores from different levels of the gold deposit.
This is significant for deep ore prospecting in the region. Daughter minerals in melt inclusions were analyzed using SEM.
Quartz, orthoclase, wollastonite and other silicate minerals were identified. They were formed in different mineral assemblages.
This analysis further proves the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form silicate
melts during metamorphic anatexis and dynamic metamorphism, which possess melt-solution characteristics. Ore formation is
related to the multi-stage forming process of silicate melt and fluid.
This research project was supported by the National Natural Science Foundation of China (Nos. 49873018, 49673189) and the
State Key Laboratory for Mineral Deposits Research, Nanjing University. |
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| Keywords: | gold deposit ductile shear zone physical-chemical condition melt inclusion fluid-melt inclusion melt and fluid metallogenesis Hetai |
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