Characteristics,origins,and significance of pyrites in deep-water shales

Chao LIANG ¹Shichao JI ²Yingchang CAO ¹Keyu LIU ¹Jing WU ³Fang HAO¹

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作者信息

1. National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;School of Geosciences,China University of Petroleum,Qingdao 266000,China;Laboratory for Marine Mineral Resource,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China
2. National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China
3. College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China
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Abstract

As important metal sulfides in the geochemical cycle of sulfur,the characteristics and formation processes of pyrites can provide useful clues regarding their environment.Based on previous findings,shale pyrites were divided into three major classes(euhedral pyrites,framboidal pyrites(framboids)and metasomatic pyrites)and six sub-classes in this study.At the microscopic scale,each type of pyrite is associated with a different formation process.Framboids are formed by burst nucleation in environments with a homogeneous distribution of nutrients while euhedral pyrites are usually formed on pre-existing sites(such as=FeS on the minerals surface)in the heterogeneous system.Metasomatic pyrites formed by the replacement of other ions in accountable material by iron ions and hydrogen sulfide ions in hydrothermal events.The morphology and isotope value of pyrite provide information to track the origins of their nutrient and characteristics of sulfur and iron pools.In addition,the trace element content of pyrite can serve as a proxy for paleo-ocean trace element abundance,indicating changes in atmospheric oxygen content.Additionally,pyrite can also serves as an indicator of shale gas reservoirs.

Key words

Shale/Pyrite/Sulfate reduction reaction/Isotope fractionation/Pyrite element

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基金项目

National Natural Science Foundation of China(42072164)

National Natural Science Foundation of China(42272119)

National Natural Science Foundation of China(41821002)

Shandong Provincial Key Research and Development Program,China(2020ZLYS08)

Taishan Scholars Program,China(TSQN201812030)

Fundamental Research Funds for the Central Universities,China(2022CX06001A)

出版年

2024

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

参考文献量207

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