| 贵州新元古代陡山沱期碳酸盐岩帽沉积地球化学特征 |
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| 关键词:Doushantuo Formation Cap Carbonate geochemistry depositional environment |
| 基金项目:国家重大基础预研项目(编号:2002CCC02600)，贵州省优秀青年科技人才基金 |
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| Sedimentary Geochemical Characteristics of the Cap Carbonate of the Doushantuo Formation in Guizhou Province |
| As a mystery of Neoproterozoic,Cap Carbonates lying on the glacial diamictites with negative carbon isotopic anomalies have been found in many regions of the world. The authors studied the Cap Carbonate in three different depositional environments in Guizhou Province,where negative carbon isotopic anomalies were observed. The negative carbon isotopic anomalies are different in different depositional environments. The flat bedding at the lower part of the cap in Tongren and Qingzhen areas can not be explained by the “snow-ball” model. Furthermore,the crystal fans at the lower part of the cap in Tongren area exhibit soft sedimentary deformational structures that may be attributed to rebound-induced seismicity. The phenomena suggest the existence of a transitional stage after the Marinoan glacial period. Not conspicuous as it is,the transitional stage can also be found in the other two areas,which implies the rapid transition from the icehouse to the greenhouse in Snowball Earth. Calculation shows that the transition stage might have lasted for 280 000 years. |
| JIANG Li-jun,ZHANG Wei-hua,GAO Hui,YANG Rui-dong.2004.Sedimentary Geochemical Characteristics of the Cap Carbonate of the Doushantuo Formation in Guizhou Province[J].Acta Geoscientica Sinica,25(2):170-176. |
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