| 中国塔里木板块南华纪成冰事件及其地层对比 |
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| 关键词:Cryogenian Nanhuan glaciation Tarim Plate debris zircon dating |
| 基金项目:中国地质调查局地质调查项目“中国新元古代年代地层格架及其全球对比”(编号: 121201011120131); 中国石化股份有限公司海相前瞻性项目“塔里木盆地构造背景、盆山动力学及油气前景”(编号: YPH08110);科技部基础性工作专项“中国地质志欧亚大陆大地构造图编制”(编号: 2011FY120100) |
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| Nanhuan Glaciation Event and Its Stratigraphic Correlation in Tarim Plate, China |
| The hypothesis of the “Snow Earth” pours new vitality into the study of the global Neoproterozoic glaciations. According to the development of glaciations in different continents, isotopic dating, ratios of δ13C/δ18O and CIA, four glaciations have been recognized in the whole globe along different sections in different continents. The change of the circle of Neoproterozoic glaciations is regarded as the start of the early biota or division. Because the top GSSP of the Crytersian has been defined, the bottom of GSSA has become a problem in the study of glaciations. Now, the Kuruk Tag section in Tarim Plate of Xinjiang is the only section with four Neoproterozoic glaciations and different volcanic rocks. The further study of the Nanhuan glaciations in Tarim is useful work for the stratigraphic correlation with the global Neoproterozoic glaciations. The authors put forward for the first time the upper limit line of the deposition of the Bolong Formation based on the distributional pattern of debris zircon ages from the Bolong Formation, Nanhuan System. The main distributional pattern of debris zircon ages comprises 2.5 Ga, 2.2 Ga and 1.8 Ga, with the youngest age being 756 Ma, suggesting that the depositional age is younger than 756 Ma. According to the distributional pattern of debris zircon ages of the Bolong Formation, they must have had different rock sources in relation to Tarim Plate. |
| GAO Lin-zhi,GUO Xian-pu,DING Xiao-zhong,ZONG Wen-ming,GAO Zhen-jia,ZHANG Chuan-heng,WANG Zi-qiang.2013.Nanhuan Glaciation Event and Its Stratigraphic Correlation in Tarim Plate, China[J].Acta Geoscientica Sinica,34(1):39-57. |
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