黔东北地区南华系大塘坡组冷泉碳酸盐岩及其意义

周琦; 杜远生; 王家生; 彭加强

Volume 32 Issue 3

May 2007

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Article Navigation > Earth Science > 2007 > 32(3): 339-346

ZHOU Qi, DU Yuan-sheng, WANG Jia-sheng, PENG Jia-qiang, 2007. Characteristics and Significance of the Cold Seep Carbonates from the Datangpo Formation of the Nanhua Series in the Northeast Guizhou. Earth Science, 32(3): 339-346.

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Characteristics and Significance of the Cold Seep Carbonates from the Datangpo Formation of the Nanhua Series in the Northeast Guizhou

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Geological Team 103, Guizhou Bureau of Geology and Mineral Resources, Tongren 554300, China

Received Date: 2006-07-03
Publish Date: 2007-05-25

Abstract

Abstract

In the Northeast Guizhou and its surrounding, a series of black shales, covering the tilm sheet of Tiesiao Formation which is thought to be formed during the Sturtian, distributes at the bottom of Datangpo Formation, lower Nanhua Series, Neoproterozoic.Generally, the lower part of the black shales is mainly composed of carbonate such as dialogite, dolomite and so on, near the center of a succession of syngenetic fault basins.Through the studies of the carbonate outcrop in this area in terms of the field structure, mineral components and the characteristics of carbonate, oxygen and sulfur isotopes, it is shown that sulfur isotope presents distinct positive excursion in contrast with carbonate isotope that indicates an intense negative excursion.In addition, a mount of stomatal dialogite and significant structures like mud volcano, diapers and so on have been found.Based on the above features, the studied carbonate is supposed to have come into being under the same mechanisms as modern cold venting carbonate on the sea floor via the seep and release of gas hydrate and the environmental mutation.Therefore a simple conclusion is obtained that the carbonate for research is possible to be generated on the ancient ocean floor in the Proterozoic as the deposition of cold venting carbonate, because of the gas hydrate seep.This study widens the research areas for the ocean floor gas hydrate and its spatial and temporal distribution, supplying a new idea for the analysis of the diagenesis, mineralization and environmental assessment.
- Nanhua Series,
- cold venting carbonate,
- Datangpo Formation,
- Northeast Guizhou

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Characteristics and Significance of the Cold Seep Carbonates from the Datangpo Formation of the Nanhua Series in the Northeast Guizhou

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