The Relationship between Oil-Gas Organic Matter and MVT Mineralization: A Case Study of the Chipu Lead-Zinc Deposit, Sichuan
详细信息
- 责任者：Wu Yue (School of Earth Environment and Water Resource ; Yangtze University ; Wuhan 430100 ; China) ; Zhang Changqing
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：34(4)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 油气 ; petroleum ; 稳定同位素地球化学 ; stable isotope geochemistry ; 四川 ; Sichuan Province
- 页码：p.425-436
- 图表：4 illus., 2 tables, 56 refs.
- 分类号：1003
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
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) H 2 S,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.Mg 2+ 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.
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