| 塔里木陆块西北缘伽师铜矿成矿流体特征与成矿作用 |
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| 引用本文： | 王伟,李文渊,唐小东,熊中乙,高满新,李天虎,宿晓虹,郭周平,孟勇,全守村,陈传庆.塔里木陆块西北缘伽师铜矿成矿流体特征与成矿作用[J].岩石矿物学杂志,2018,37(4):605-620. |
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| 作者姓名： | 王伟 李文渊 唐小东 熊中乙 高满新 李天虎 宿晓虹 郭周平 孟勇 全守村 陈传庆 |
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| 作者单位： | 长安大学地球科学与资源学院;国土资源部岩浆作用成矿与找矿重点实验室中国地质调查局西安地质调查中心;中国冶金地质勘查工程总局新疆地质勘查院 |
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| 基金项目： | 中国地质调查局地质调查项目（DD20160015，DD20160009，12120113043700） |
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| 摘 要： | 伽师铜矿是柯坪盆地砂岩型铜矿的典型代表,多位学者曾对其成因进行研究,但均缺乏详细地球化学证据。本次研究认为该矿床成矿期分为成岩成矿期与改造成矿期,以成岩成矿期为主。本文通过对伽师铜矿不同成矿期包裹体显微测温,成分分析以及氢、氧、碳、硫同位素的研究,探讨了该矿床成矿流体形成演化与成矿作用的关系。结果表明,该矿床成矿流体成岩期均一温度为131~206℃,盐度0.35%~9.86%(NaCl_(eq),质量分数,下同),流体密度0.90~0.99 g/cm~3,流体压力为227~464 MPa;改造期均一温度为131~285℃,盐度0.53%~9.34%,流体密度0.78~1.00 g/cm~3,流体压力为231~448 MPa,总体表现为中低温、中压、中低盐度、中等密度特征,具有典型地下热卤水特点。其δ~(34)S值范围为-34.5‰~-22.7‰,表明该矿床的硫主要源自硫酸盐细菌还原和有机质还原;成岩期包裹体水的δD值为-105.4‰~-79.2‰、δ~(18)O_(H_2O)为-3.13‰~0.87‰,改造期δD值为-108.5‰~-81.3‰,δ~(18)O_(H_2O)为-4.21‰~4.04‰,表明成矿流体为大气降水、盆地卤水二者混合来源,并有有机水加入;其成岩期δ13C值为-28.4‰~-24.2‰,改造期δ~(13)C值为-28.5‰~-23.0‰,与自然界有机碳δ~(13)C的负值范围特征吻合,激光拉曼探针成分分析显示该矿床成矿流体成岩期、改造期成分主要为CH_4、H_2S、H_2O等,指示油田卤水中有机质参与了矿床成岩期、改造期成矿作用过程,在伽师铜矿成矿过程中起重要还原作用。综合分析认为,有机质与伽师铜矿成矿作用关系密切,该矿床是油田卤水参与成矿作用的沉积-改造成因砂岩型铜矿。
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| 关 键 词： | 塔里木陆块 伽师 砂岩型铜矿 成矿流体 成矿作用 |
| 收稿时间： | 2017/8/24 0:00:00 |
Ore-forming fluid features and mineralization of the Jiashi copper deposit in northwestern Tarim Block |
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| WANG Wei,LI Wen-yuan,TANG Xiao-dong,XIONG Zhong-yi,GAO Man-xin,LI Tian-hu,SU Xiao-hong,GUO Zhou-ping,MENG Yong,QUAN Shou-cun and CHEN Chuan-qing.Ore-forming fluid features and mineralization of the Jiashi copper deposit in northwestern Tarim Block[J].Acta Petrologica Et Mineralogica,2018,37(4):605-620. |
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| Authors: | WANG Wei LI Wen-yuan TANG Xiao-dong XIONG Zhong-yi GAO Man-xin LI Tian-hu SU Xiao-hong GUO Zhou-ping MENG Yong QUAN Shou-cun and CHEN Chuan-qing |
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| Institution: | Faculty of Earth Science and Resources, Chang''an University, Xi''an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Faculty of Earth Science and Resources, Chang''an University, Xi''an 710054, China;Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Xinjiang Institute of China Geological Exploration and Engineering Bureau, Urumqi 830000, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China,Key Laboratory for the Study of Focused Magmatism and Giant ore Deposits, MLR, Xi''an Center of Geological Survey, CGS, Xi''an 710054, China and Xinjiang Institute of China Geological Exploration and Engineering Bureau, Urumqi 830000, China |
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| Abstract: | |
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| Keywords: | Tarim block Jiashi sandstone copper deposit ore-forming fluid mineralization |
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