四川广元上寺剖面不同地史时期沥青的钼同位素组成及意义

张海强; 周炼; 王瑾; 苏洁; 曹菱; 戴梦宁

doi:10.3799/dqkx.2011.111

Volume 36 Issue 6

Jun. 2011

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Article Navigation > Earth Science > 2011 > 36(6): 1053-1063

ZHANG Hai-qiang, ZHOU Lian, WANG Jin, SU Jie, CAO Ling, DAI Meng-ning, 2011. Molybdenum Isotopic Compositions and Significance of Bitumen at Different Geological Periods in Shangsi Section, Guangyuan, Sichuan. Earth Science, 36(6): 1053-1063. doi: 10.3799/dqkx.2011.111

Citation:

ZHANG Hai-qiang, ZHOU Lian, WANG Jin, SU Jie, CAO Ling, DAI Meng-ning, 2011. Molybdenum Isotopic Compositions and Significance of Bitumen at Different Geological Periods in Shangsi Section, Guangyuan, Sichuan. Earth Science, 36(6): 1053-1063. doi: 10.3799/dqkx.2011.111

Citation:

ZHANG Hai-qiang, ZHOU Lian, WANG Jin, SU Jie, CAO Ling, DAI Meng-ning, 2011. Molybdenum Isotopic Compositions and Significance of Bitumen at Different Geological Periods in Shangsi Section, Guangyuan, Sichuan. Earth Science, 36(6): 1053-1063. doi: 10.3799/dqkx.2011.111

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Molybdenum Isotopic Compositions and Significance of Bitumen at Different Geological Periods in Shangsi Section, Guangyuan, Sichuan

doi: 10.3799/dqkx.2011.111

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2011-01-10
Available Online: 2021-11-10
Publish Date: 2011-06-15

Abstract

Abstract

In this research, new Molybdenum isotopic compositions of the bitumen, in the Gaungyuan section, Sichuan, as well as trace elements are determined. The results show that it has a large variation of δ⁹⁸Mo (+0.34‰~+1.71‰) in this region, reaching the range of anoxic sediments δ⁹⁸Mo in general. The slightly positive δEu anomaly has been shown in the Cambrian interval (0.75-1.68), specially, with a sample from Qiongzhusi Formation (Hs-qzs) with a significant positive δEu anomaly (1.68), corresponding to the enrichment of redox-sensitive trace elements (such as Mo, Ni, V), with the positive δ⁹⁸Mo (1.17‰-1.71‰). These characteristics might be related to local intense hydrothermal erupting, corresponding to the large quantity of H₂S and HS^- into the contemporaneous seawater. Introduction of these sulfide gases would cause MoO₄^2- to be transferred into MoS₄^2-, favoring the preferential deposition of the heavy Mo isotope as MoS₄^2- and thus leaving a positive Mo isotope value. Although no much good correlation between TM_V and TM_Ni has been shown in this area, the distinct fields from difference interval of bitumen is observed by the plot of δ⁹⁸Mo against V/Ni ratios, it implies the possible stability of δ⁹⁸Mo by local mobilization during diagenesis/early catagenesis.
- Molybdenum isotope,
- bitumen,
- marine sediment,
- geochemistry

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References(78)

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Molybdenum Isotopic Compositions and Significance of Bitumen at Different Geological Periods in Shangsi Section, Guangyuan, Sichuan

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