从地球生物学角度讨论华南中二叠世海相烃源岩缺氧沉积环境成因模式

颜佳新; 刘新宇

Volume 32 Issue 6

Jun. 2007

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Article Navigation > Earth Science > 2007 > 32(6): 789-796

YAN Jia-xin, LIU Xin-yu, 2007. Geobiological Interpretation of the Oxygen-Deficient Deposits of the Middle Permian Marine Source Rocks in South China: A Working Hypothesis. Earth Science, 32(6): 789-796.

Citation:

YAN Jia-xin, LIU Xin-yu, 2007. Geobiological Interpretation of the Oxygen-Deficient Deposits of the Middle Permian Marine Source Rocks in South China: A Working Hypothesis. Earth Science, 32(6): 789-796.

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Geobiological Interpretation of the Oxygen-Deficient Deposits of the Middle Permian Marine Source Rocks in South China: A Working Hypothesis

YAN Jia-xin^{1, 2
,},
LIU Xin-yu¹

1.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2007-08-26
Publish Date: 2007-11-25

Abstract

Abstract

To decipher the origin of oxygen-deficient shelf deposits is significant for tracing the distributions of marine hydrocarbon source rocks and interpreting the evolution of depositional environments. The origin of the Middle Permian Chihsia Formation from South China remains a puzzle for long, with its evident oxygen-deficient features associated with diverse benthos. This paper introduce briefly the nature of oxygen-deficient shelf environment as well as subdivision of related paleoxygenation facies, and shows a typical Chihsian depositional sequence with ecological and geochemical features. Massive bioclastic limestone from the middle of the sequence was believed to be formed under the aerobic conditions, supporting by both ecological and geochemical features. However, a contradictory conclusion is observed for "laminated" limestones from the lower and upper parts of the sequence; the aerobic ecological signal was associated with the anoxic geochemical record. The association of contradictory signals in ecology and geochemistry was here interpreted as the instability of paleoxygenation condition in shelf environment, caused by enhanced paleoproductivity. Repetitive occurrence of oxygen-deficient condition might have been stemmed from paleo-Tethyan currents flowing across the South China.
- South China,
- Middle Permian,
- oxygen-deficient,
- paleoxygenation facies,
- model

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References(27)

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