| 晚震旦世至早寒武世扬子地台北缘碳同位素研究 |
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| 关键词:Late Sinian to Early Cambrian carbon isotope composition environmental change Yangtze platform Nanjiang in Sichuan |
| 基金项目:国家自然科学基金项目(40072047、40303001) |
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| 摘要: |
| Isotopic Investigation of Late Neoproterozoic and Early Cambrian Carbon Cycle on the Northern Yangtze Platform, South China |
| The Precambrian-Cambrian transition is one of the critical time intervals in Earth history. Profound geotectonic climatic and biological changes occurred during late Neoproterozoic and the period of its transition into early Cambrian. This paper has studied paired carbonate and organic carbon isotope determinations of samples from Nanjiang of Sichuan Province on the northern Yangtze Platform, and provided a preliminary geochemical explanation for environmental changes in relation to bio-events on the northern Yangtze Platform during the Precambrian-Cambrian transitional interval. Organic carbon isotopic compositions of sediments vary from -35.8‰ to -30.1‰ and carbonate carbon isotopic compositions change between -3.5‰ and +0.5‰ along the Nanjiang section. Varied carbon and sulfur isotopic compositions and different contents of pyrite and organic materials reflect the changing environment and the burial of organic matter in the Dengying Formation and the lower and upper parts of Niutitang Formation. The anoxic conditions result in the widespread preservation of organic-rich sediments and pyrites in the black shale on the Yangtze Platform. |
| GUO Qing-jun,LIU Cong-qian,Harald Strauss,Tatiana Goldberg.2004.Isotopic Investigation of Late Neoproterozoic and Early Cambrian Carbon Cycle on the Northern Yangtze Platform, South China[J].Acta Geoscientica Sinica,25(2):151-156. |
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