华南李家沱剖面寒武纪纽芬兰世海水氧化还原性质演化及其驱动因素

向雷; 蔡春芳; 贺训云; 姜磊; 袁余洋; 汪天凯; 贾连奇

doi:10.3799/dqkx.2015.100

Volume 40 Issue 7

Jul. 2015

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Article Navigation > Earth Science > 2015 > 40(7): 1197-1214

Xiang Lei, Cai Chunfang, He Xunyun, Jiang Lei, Yuan Yuyang, Wang Tiankai, Jia Lianqi, 2015. Ocean Redox State Evolution and Its Controlling Factors during Cambrian Terreneuvian Epoch: Evidence from Lijiatuo Section, South China. Earth Science, 40(7): 1197-1214. doi: 10.3799/dqkx.2015.100

Citation:

Xiang Lei, Cai Chunfang, He Xunyun, Jiang Lei, Yuan Yuyang, Wang Tiankai, Jia Lianqi, 2015. Ocean Redox State Evolution and Its Controlling Factors during Cambrian Terreneuvian Epoch: Evidence from Lijiatuo Section, South China. Earth Science, 40(7): 1197-1214. doi: 10.3799/dqkx.2015.100

Citation:

Xiang Lei, Cai Chunfang, He Xunyun, Jiang Lei, Yuan Yuyang, Wang Tiankai, Jia Lianqi, 2015. Ocean Redox State Evolution and Its Controlling Factors during Cambrian Terreneuvian Epoch: Evidence from Lijiatuo Section, South China. Earth Science, 40(7): 1197-1214. doi: 10.3799/dqkx.2015.100

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Ocean Redox State Evolution and Its Controlling Factors during Cambrian Terreneuvian Epoch: Evidence from Lijiatuo Section, South China

doi: 10.3799/dqkx.2015.100

1.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Received Date: 2014-12-30
Publish Date: 2015-07-15

Abstract

Abstract

The evolution of atmospheric and oceanic oxygen content played an important role in the metazoans' radiation around Ediacaran-Cambrian transition. To explore the vertical stratigraphic evolution and controls of the redox ocean state, primary productivity and seawater sulfate levels during the Terreneuvian epoch, South China, Lijiatuo section, a well-exposed one that is located in the slope and basin environment and consists of mudstones of Xiaoyanxi Formation and cherts of Liuchapo Formation, is selected as the study area for an in-depth analysis of the trace elements, total organic carbon(TOC), organic carbon isotopes, total sulfur(TS) and the sulfur isotope of the pyrite. Based on the ratios of V/Sc, Th/U and the enrichment factors of Mo, U, V, Ni and Cu in the Lijiatuo section, five oxic-anoxic cycles are identified across the Terreneuvian epoch. Except for the middle-upper Liuchapo Formation and the middle Xiaoyanxi Formation, the rest parts of the Lijiatuo section are under anoxic conditions. The Re/Mo ratios demonstrate that the oxic environment of the middle Xiaoyanxi Formation is accompanied by transient sulfidic conditions, and the rest parts of the section are under anoxic and non-sulfidic conditions. All the TOC and the enrichment factors of Ba, Ni, Cu, Zn and Cd demonstrate that both the sink and burial flux of organic matter of Liuchapo Formation are lower than those of the overlying Xiaoyanxi Formation. The highest sink and burial fluxes of organic matter in the Xiaoyanxi Formation appeare in its lower parts, however, whereas the lowest sink and burial fluxes of organic matter in the Xiaoyanxi Formation appeare in its middle parts. The proxies of TOC/TS, TS and the vertical trend of sulfur isotope of pyrite show that the majority of the Lijiatuo section is under low seawater sulfate levels. The low seawater sulfate level was the dominating control for the depletion of free H₂S in the majority of the anoxic depositional environment of Lijiatuo section during Terreneuvian epoch. The rise of the atmospheric oxygen content was the principal driver for the coupled, transient oxic and near sulfidic environment in the middle Xiaoyanxi Formation.
- trace element,
- sulfur isotope of pyrite,
- redox state,
- seawater sulfate level,
- Terreneuvian epoch,
- Lijiatuo section,
- geochemisty

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References(95)

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Ocean Redox State Evolution and Its Controlling Factors during Cambrian Terreneuvian Epoch: Evidence from Lijiatuo Section, South China

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