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首页> 外文期刊>Journal of the Geological Society of India >Identification and significance of CH4-rich fluid inclusions in Langdu skarn Cu deposit, Yunnan Province, China
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Identification and significance of CH4-rich fluid inclusions in Langdu skarn Cu deposit, Yunnan Province, China

机译：云南郎都矽卡岩型铜矿床富CH4流体包裹体的识别及意义

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摘要

Single-phase CH4 and two-phase CH4-rich fluid inclusions were identified at Langdu skarn Cu deposit in Zhongdian area, southwest China. Microthermometric results confirm that the single-phase CH4 fluid inclusions are homogenized to liquid from -118.3A(0)C to -114.2A(0)C, and two-phase CH4-rich fluid inclusions partly homogenized from -87.5 A(0)C to -84.7 A(0)C. Laser Raman micospectroscopic analyses show that vapors of the fluid inclusions are dominant of CH4 with minor N-2. The two-phase CH4-rich fluid inclusions allow the determination of the fluid temperature (300A degrees C to 400A degrees C) and pressure (1014 bars to 1484 bars) during mineralization, suggesting that ore formation took place at 3.8 to 4.8 km depth under lithostatic pressure. CH4 contained in the fluid inclusions most likely formed by the reaction 2C + 2H(2)O=CH4+CO2 between carbonaceous slate from Qugasi Formation and hydrothermal fluids either in situ or during migration. CH4 (and/or N-2) will greatly expand the field of vapor/liquid immiscibility and will act as reducing agent which transforms SO4 (2-) to S2- that is essential anion for sulfide deposition. Numerous massive sulfide deposits (chalcopyrite and pyrrhotite) reflect that physical and chemical condition of hydrothermal fluid and significant change would be caused by CH4.
机译：在中国西南地区中甸地区的郎都矽卡岩型铜矿床中发现了富含单相CH4和两相CH4的流体包裹体。微量热测量结果证实，单相CH4流体夹杂物从-118.3A（0）C到-114.2A（0）C均质化为液体，富两相CH4流体夹杂物从-87.5 A（0）均质化C至-84.7 A（0）C。激光拉曼光谱分析表明，流体包裹体中的蒸气是CH4的主要成分，N-2含量较低。富含CH4的两相流体包裹体可以确定矿化过程中的流体温度（300A摄氏度至400A摄氏度）和压力（1014巴至1484巴），这表明成矿发生在3.8至4.8 km的深度下。岩石静压力。来自Qugasi组的含碳板岩与原位或运移过程中的热液之间的2C + 2H（2）O = CH4 + CO2反应很可能形成了流体包裹体中所含的CH4。 CH4（和/或N-2）将极大地扩展气/液不溶混性的范围，并充当还原剂，将SO4（2-）转化为S2-，这是硫化物沉积所必需的阴离子。大量块状硫化物（黄铜矿和黄铁矿）反映出热液的物理和化学条件，CH4会引起显着变化。

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