The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China

Lei Xiang; Chunfang Cai; Xunyun He; Lei Jiang; Yuyang Yuan; Tiankai Wang; Lianqi Jia; Lei Yu

doi:10.1007/s12583-016-0695-3

Volume 27 Issue 2

Mar 2016

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Journal of Earth Science > 2016 > 27(2): 255-270.

Lei Xiang, Chunfang Cai, Xunyun He, Lei Jiang, Yuyang Yuan, Tiankai Wang, Lianqi Jia, Lei Yu. The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China. Journal of Earth Science, 2016, 27(2): 255-270. doi: 10.1007/s12583-016-0695-3

Citation:

Lei Xiang, Chunfang Cai, Xunyun He, Lei Jiang, Yuyang Yuan, Tiankai Wang, Lianqi Jia, Lei Yu. The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China. Journal of Earth Science, 2016, 27(2): 255-270. doi: 10.1007/s12583-016-0695-3

Citation:

Lei Xiang, Chunfang Cai, Xunyun He, Lei Jiang, Yuyang Yuan, Tiankai Wang, Lianqi Jia, Lei Yu. The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China. Journal of Earth Science, 2016, 27(2): 255-270. doi: 10.1007/s12583-016-0695-3

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The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China

doi: 10.1007/s12583-016-0695-3

1.
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
2.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.
Hangzhou Research Institute of Geology, PetroChina, Hangzhou 310023, China
4.
Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, PetroChina, Xi'an 710018, China

More Information

Corresponding author: Lei Xiang, 649900940@qq.com
Received Date: 17 Mar 2015
Accepted Date: 12 Jun 2015
Publish Date: 01 Apr 2016

Abstract

Abstract

Well-exposed Lijiatuo Section was chosen to explore the temporal evolution and controls of the oceanic redox state, primary productivity and seawater sulfate levels during the Cambrian Series 1-2, South China. This section consists of Xiaoyanxi Formation (Fm.) mudstones and Liuchapo Fm. cherts that deposited in the slope and basin environment. Five oxic-anoxic cycles were identified based on V/Sc, Th/U and the enrichment factors of Mo, U, V, Ni and Cu. The Middle-Upper Liuchapo Fm. and the Middle Xiaoyanxi Fm. were deposited under oxic-suboxic conditions, and the rest of the strata were under anoxic conditions. The Re/Mo ratio demonstrated that the oxic-suboxic conditions in the Middle Xiaoyanxi Fm. were accompanied by transient sulfidic conditions, and the rest of the section was underanoxic and non-sulfidic conditions. All the TOC and the enrichment factors of Ba, Ni, Cu, Zn and Cd demonstrated that both the sinking and burial flux of organic matter (OM) in Liuchapo Fm. were lower than that in the overlying Xiaoyanxi Fm. The highest sinking and burial flux of OM in the Xiaoyanxi Fm. appeared at its lower parts; however, the lowest sinking and burial flux of OM in the Xiaoyanxi Fm. appeared in its middle parts. TOC/TS, TS and the vertical trend of δ³⁴S_py demonstrated that the seawater was dominated by low oceanic sulfate levels, which resulted in the absence of free H₂S. The rise of the atmospheric oxygen content may be the principal driver for the associated, transient suboxic-oxic and nearly sulfidic environment in the middle Xiaoyanxi Fm.
- trace element,
- redox state,
- seawater sulfate level,
- Cambrian Series 1-2,
- South China

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The Ocean Redox State Evolution and Its Controls during the Cambrian Series 1–2: Evidence from Lijiatuo Section, South China

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