| 油气有机质与MVT铅锌矿床的成矿——以四川赤普铅锌矿为例 |
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| 关键词:Chipu MVT deposit sulfur isotopes and Carbon-Oxygen isotopes TSR of organic matter mineralization and Oil-gas destruction Sichuan |
| 基金项目:国家自然科学基金项目(编号: 40902029);中央级公益性科研院所基本科研业务费专项资金(编号: K0904; 200911007);地质过程与矿产资源国家重点实验室开放课题基金项目(编号: GPMR2011);成矿作用与资源评价重点实验室开放基金(编号: ZS1102) |
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| The Relationship between Oil-gas Organic Matter and MVT Mineralization: A Case Study of the Chipu Lead-zinc Deposit, Sichuan |
| There is a close relationship between mineralization of the Chipu MVT deposit and oil-gas reservoirs. Through a systematic study of sulfur isotope of sulfides and carbon and oxygen isotopes of hydrothermal carbonates, combined with organic geochemical characteristics of bitumen, the authors suggest a possible lead-zinc mineralization process in this deposit. The conclusions are as follows: (1) H2S, derived from cracking of crude oil was the main sulfur source for early-stage mineralization, whereas the thermochemical sulfate reduction provided reduced sulfur once TSR process was triggered. Mg2+ could be a key factor controlling the TSR reaction. (2) The carbon and oxygen isotopic variation of hydrothermal sparry carbonates was contributed by heterogeneous mixture of the host-rock dolomite isotope source and the lighter organic one. (3) The bitumen has the features of high-degree degradation and low aromatics content, which is considered to have been involved in the lead-zinc mineralization of the Chipu MVT deposit as well as other deposits. (4) The Pb-Zn mineralization and oil-gas field formation in this area were products of basin fluids, corresponding to the different stages of the basin-and-range system. |
| WU Yue,ZHANG Chang-qing,MAO Jing-wen,ZHANG Wang-sheng,WEI Cheng.2013.The Relationship between Oil-gas Organic Matter and MVT Mineralization: A Case Study of the Chipu Lead-zinc Deposit, Sichuan[J].Acta Geoscientica Sinica,34(4):425-436. |
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