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XIONG Guo-qing. Doushantuo Formation in northwestern Fanjing Mountains, Guizhou[J]. Sedimentary Geology and Tethyan Geology, 2006, 26(2): 106-109.
Citation: XIONG Guo-qing. Doushantuo Formation in northwestern Fanjing Mountains, Guizhou[J]. Sedimentary Geology and Tethyan Geology, 2006, 26(2): 106-109.

Doushantuo Formation in northwestern Fanjing Mountains, Guizhou

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  • Received Date: March 05, 2006
  • Published Date: June 29, 2006
  • Similar to the δ13CPDB values for the cap carbonates overlying the Marinoan glacial diamictites in the other parts of the world, there is a markedly negative excursion of the δ13CPDB values for the Neoproterozoic cap dolostones in northwestern Fanjing Mountains, Guizhou. The δ13CPDB values range from -1.4‰ to -8.52‰, with an average value of -4.52‰, and the δ18OPDB values range from -5.44‰ to -11.34‰, with an average value of -8.68‰. Except two data for the cap dolostones at the top, the rest δ13CPDB and δ18OPDB values generally increase upsection, and have a slightly positive correlation. The examination of sedimentary structures and carbon isotope shows that the cap dolostones in the study area are not related with the release of solid methane from the submarine permafrost soil. Instead they should be the products originated from the rapid precipitation of the weathered terrigenous alkaline matter following the reaction with CO2 due to the warmer climates after the Nantuoan glacial stage. This explanation strongly supports the "snowball Earth" hypothesis.
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