贵州松桃大塘坡地区南华纪早期冷泉碳酸盐岩地质地球化学特征

周琦; 杜远生; 颜佳新; 张命桥; 尹森林

Volume 32 Issue 6

Jun. 2007

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Article Navigation > Earth Science > 2007 > 32(6): 845-852

ZHOU Qi, DU Yuan-sheng, YAN Jia-xin, ZHANG Ming-qiao, YIN Sen-lin, 2007. Geological and Geochemical Characteristics of the Cold Seep Carbonates in the Early Nanhua System in Datangpo, Songtao, Guizhou Province. Earth Science, 32(6): 845-852.

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Geological and Geochemical Characteristics of the Cold Seep Carbonates in the Early Nanhua System in Datangpo, Songtao, Guizhou Province

ZHOU Qi^{1, 3
,},
DU Yuan-sheng^{1, 2
,
,},
YAN Jia-xin^{1, 2},
ZHANG Ming-qiao³,
YIN Sen-lin³

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Geological Team 103, Guizhou Bureau of Geology and Mineral Resources, Tongren 554300, China

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

Abstract

Abstract

Nanhua System in Datangpo, Songtao County, Guizhou Province is proposed to be one of the ideal areas to investigate the ancient gas seep and the associated cold spring carbonates. The cold seep carbonates found here occur as two kinds of rocks. One is the dolomite hills or lens in the clastic rocks of Liangjiehe Formation, which is thought to be formed during the early Sturtian glacial stage, and thus to be the oldest cold spring carbonates. The other is represented by the rhodochrosite orebodies occurring as layers and lens in association with some dolomite lens in the black manganese-bearing rocks in the first member in Datangpo Formation. The carbon isotope composition of the cold spring carbonates in the area shows a negative anomaly, and the carbon isotope composition of the asphalt filled in the gas holes in rhodochrosite orebodies is measured to be -30.98‰. The negative carbon isotope values are associated with the positive anomaly of the sulfur isotope composition. The cold seep carbonate rocks identified in this region are comparable with modern counterparts in the characteristics and the distribution of the carbonates, the gas seep structures and the depositional organics in the rhodochrosite orebodies. The dolomite hills and the rhodochrosite orebodies are formed in the same ancient gas seep system during different periods, showing a close relationship with the hydrocarbon source rocks of Datangpo Formation.
- Guizhou,
- Nanhua System,
- cold spring carbonates,
- geochemistry

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Geological and Geochemical Characteristics of the Cold Seep Carbonates in the Early Nanhua System in Datangpo, Songtao, Guizhou Province

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