A new age constraint on the onset of the neoproterozoic glaciations in the Yangtze platform, South China
A new age constraint on the onset of the neoproterozoic glaciations in the Yangtze platform, South China
复制标题
华南扬子地台新元古代冰川爆发的新时代约束
DOI：
10.1086/589312
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发表时间：
2008-07-01
影响因子：
1.8
通讯作者：
Song, Biao
中科院分区：
文献类型：
--
作者：
Zhang, Qi-Rui;Li, Xian-Hua;Song, Biao
对湖南省早新元古代板溪群顶部的一个样品进行了SHRIMP锆石U-Pb年龄测定。由此得到的725 +/- 10 Ma的年龄可能解决了莲沱组与冰前期对比的争论，并表明莲沱组很可能与冰前期的板溪群相对应。由于板溪群向上过渡到江口群，该年龄成为江口冰川作用开始的新的最大年龄限制，因此江口冰川作用很可能与Sturtian冰川作用有关。
A sample from the top of the Banxi Group ( early Neoproterozoic) in Hunan Province ( South China) was dated by the SHRIMP zircon U-Pb method. The resulting age of 725 +/- 10 Ma probably solves the debate between the synglacial and the preglacial correlation of the Liantuo Formation and indicates that the Liantuo Formation most likely correlates with the preglacial Banxi Group. Since the Banxi (Danzhou) Group is upwardly transitional to the glacial Jiangkou Group, the age becomes a new maximum age constraint on the onset of the Jiangkou glaciation, which therefore most likely correlates with the Sturtian glaciation.