| 华南地区新元古代年代地层标定及地层对比 |
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| 关键词:South China Neoproterozoic chronostratigraphy Qingbaikouan Nanhuan |
| 基金项目:国家自然科学基金项目“华南长安冰期下界年龄及成冰纪生物地层学研究”(编号: 41372038);中国地质调查局项目“中国及邻区新元古代年代地层格架及全球对比”(编号: 12120113013900);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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| Rating Data of the Neoproterozoic Chronostratigraphy and Stratigraphic Correlation in South China |
| Neoproterozoic strata in South China consist of Qingbaikouan, Nanhuan and Sinian systems in Chinese Time Scale which can be respectively correlated with Tonian, Cryogenian and Ediacaran systems in the International Time Scale. The South China area is subdivided into two parts, i.e., Upper and Lower Yangtze blocks. Traditionally, the Jinning Movement or Sibao Movement is regarded as the marker for the boundary between the Mesoproterozoic and the Neoproterozoic. In recent years, the SHRIMP U-Pb determination of the tuff zircons from the strata has yielded effective dating data for chronology of Neoproterozoic strata, which give prominence to the reliability of the stratigraphic correlation and add interpretation of new tectonic viewpoints. We should take the tectonic as the key to tectonic evolution studies so as to reconfirm the depositional records of Late Mesoproterozoic on the margin of South China. However, the Sibao movement is a late orogeny in the interior of South China old land. The new chronostratigraphic data promote tectonic division, stratigraphic correlation and understanding of stratabound deposits. At the same time, a framework will contribute to the stratigraphic correlation of global and continental blocks. In this paper, the authors present the SHRIMP zircon U-Pb data ((799.8±5.5) Ma) obtained at the bottom of Qingbaikouan Gongdong Formation in western Guangxi, the SHRIMP zircon U-Pb age of (770±10) Ma for the Chang’an Formation in Jiangxi- Hunan border area, the SHRIMP zircon U-Pb age of (758.6±5.4) Ma for the bottom of the Chang’an Formation in western Hunan, and the SHRIMP zircon U-Pb age of (743.8±4.1) Ma for the strata 10 m above the bottom of the Chang’an Formation at Wanxikou Village. These data further provide the geochronologic basis for dismictite strata in South China. |
| GAO Lin-zhi,YIN Chong-yu,DING Xiao-zhong,WANG Ze-jiu,ZHANG Heng.2015.Rating Data of the Neoproterozoic Chronostratigraphy and Stratigraphic Correlation in South China[J].Acta Geoscientica Sinica,36(5):533-545. |
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