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Sulfur Isotopes of Framboidal Pyrite in the Permian-Triassic Boundary Clay at Meishan Section
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This paper is supported by China Scholarship Council, National Natural Science Foundation of China (No. 40572020) and Doctoral Program of Higher Education (No. 20040290005).


Sulfur Isotopes of Framboidal Pyrite in the Permian-Triassic Boundary Clay at Meishan Section
Author:
  • ZHANG Jun

    ZHANG Jun

    1 State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing 100083, China； 2 Haihe River Water Environmental Monitoring Center, Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China
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  • LIANG Handong

    LIANG Handong

    1 State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing 100083, China； 2 Haihe River Water Environmental Monitoring Center, Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China
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  • HE Xiaoqing

    HE Xiaoqing

    1 State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing 100083, China； 2 Haihe River Water Environmental Monitoring Center, Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China
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  • YANG Ye

    YANG Ye

    1 State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing 100083, China； 2 Haihe River Water Environmental Monitoring Center, Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China
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  • CHEN Baohua

    CHEN Baohua

    1 State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing 100083, China； 2 Haihe River Water Environmental Monitoring Center, Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China
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Fund Project:

This paper is supported by China Scholarship Council, National Natural Science Foundation of China (No. 40572020) and Doctoral Program of Higher Education (No. 20040290005).

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    摘要:

    Pyrite framboids were found in the Permian-Triassic boundary at Meishan Section, while their sulfur isotopes were determined. The majority of framboids is less than 5 μm in diameter, with some large-sized framboids. Also, euhedral gypsums were observed in the boundary clay. The authors suppose that most of the pyrite framboids formed just below the redox boundary and stopped growing after entering the lower water column. The result indicates that it was probably lower dysoxia condition in the temporal ocean. Moreover, the authors also presume that some pyrite was oxidated to sulfates accompanying the fluctuation of redox condition, which would probably be the origin of the negative sulfur isotopes of gypsum and CAS reported before. In addition, sulfur isotope of framboidal pyrite suggests that sulfur is originated from bacterial sulfate reduction in anoxic condition. Therefore, this study confirms that the ocean was widely anoxic during the Permian-Triassic transitional period. However, the redox condition in temporal ocean was probably not stable, with short-term fluctuations.

    Abstract:

    Pyrite framboids were found in the Permian-Triassic boundary at Meishan Section, while their sulfur isotopes were determined. The majority of framboids is less than 5 μm in diameter, with some large-sized framboids. Also, euhedral gypsums were observed in the boundary clay. The authors suppose that most of the pyrite framboids formed just below the redox boundary and stopped growing after entering the lower water column. The result indicates that it was probably lower dysoxia condition in the temporal ocean. Moreover, the authors also presume that some pyrite was oxidated to sulfates accompanying the fluctuation of redox condition, which would probably be the origin of the negative sulfur isotopes of gypsum and CAS reported before. In addition, sulfur isotope of framboidal pyrite suggests that sulfur is originated from bacterial sulfate reduction in anoxic condition. Therefore, this study confirms that the ocean was widely anoxic during the Permian-Triassic transitional period. However, the redox condition in temporal ocean was probably not stable, with short-term fluctuations.

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ZHANG Jun, LIANG Handong, HE Xiaoqing, YANG Ye, CHEN Baohua.2011. Sulfur Isotopes of Framboidal Pyrite in the Permian-Triassic Boundary Clay at Meishan Section[J]. ACTA GEOLOGICA SINICA(English edition),85(3):694~701

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  • 收稿日期:2010-12-01
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