湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征

邓义楠; 郭庆军; 朱茂炎; 张俊明

doi:10.3799/dqkx.2014.027

Volume 39 Issue 3

Mar. 2014

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Article Navigation > Earth Science > 2014 > 39(3): 283-292

Deng Yinan, Guo Qingjun, Zhu Maoyan, Zhang Junming, 2014. REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan. Earth Science, 39(3): 283-292. doi: 10.3799/dqkx.2014.027

Citation:

Deng Yinan, Guo Qingjun, Zhu Maoyan, Zhang Junming, 2014. REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan. Earth Science, 39(3): 283-292. doi: 10.3799/dqkx.2014.027

Deng Yinan, Guo Qingjun, Zhu Maoyan, Zhang Junming, 2014. REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan. Earth Science, 39(3): 283-292. doi: 10.3799/dqkx.2014.027

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REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan

doi: 10.3799/dqkx.2014.027

Deng Yinan^{1, 2, 3
,},
Guo Qingjun^{3
,
,},
Zhu Maoyan⁴,
Zhang Junming⁴

1.
Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China
2.
Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510075, China
3.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
4.
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Received Date: 2013-09-26
Publish Date: 2014-03-15

Abstract

Abstract

Organic matter from Early Cambrian black rock series in western Hunan was derived from organisms in the euphotic zone. For not interfered by the detrital component, REE geochemistry of organic matter can demonstrate paleoenvironmental characteristics of the upper seawater. As the main part of organic matter, kerogen is fully consistent with the modern seawater—like REE pattern which shows a progressive enrichment towards the heavier REE, depletion of Ce, positive anomalies of Y and no obvious anomalies of Eu. The characteristics of kerogen may trace paleoredox condition of upper seawater. The euxinic environment may have arised in the lower part of sections in the Yangtze area, and the depositional condition may have shifted to gradual oxidization in the upper part of sections. The negative Ce anomalies of bulk rocks are most probably derived from organic matter input. Gradual increase of Ce/Ce^* values indicates increasing oxygen content of upper seawater, and weakening of euxinic environment of bottom seawater may result in rising of oxygen content of upper seawater.
- western Hunan,
- Early Cambrian,
- rare earth element (REE),
- kerogen,
- black rock series,
- geochemistry

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References(47)

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REE Geochemistry of Kerogen from Early Cambrian Black Rock Series in Western Hunan

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