U-Pb ages from the neoproterozoic Doushantuo Formation, China
U-Pb ages from the neoproterozoic Doushantuo Formation, China
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DOI：
10.1126/science.1107765
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发表时间：
2005-04-01
期刊：
影响因子：
56.9
通讯作者：
Jin, YG
中科院分区：
文献类型：
--
作者：
Condon, D;Zhu, MY;Jin, YG
中国陡山沱组火山灰层锆石U-Pb年龄表明陡山沱组的沉积发生在6.35亿~ 5.51亿年前。该基地记录了全球规模的马里诺冰川作用的终止，并与纳米比亚的类似年代岩石同时代，表明同步冰川消退。碳同位素和层序地层学数据表明，陡山沱组的壮观动物化石大部分年龄小于5.8亿年。陡山沱组最上部的碳酸盐碳同位素出现明显的负偏移，我们认为这是一个发生在约5.51亿年前的全球性事件。
U-Pb zircon dates from volcanic ash beds within the Doushantuo Formation (China) indicate that its deposition occurred between 635 and 551 million years ago. The base records termination of the global-scale Marinoan glaciation and is coeval with similar dated rocks from Namibia, indicating synchronous deglaciation. Carbon isotopic and sequence-stratigraphic data imply that the spectacular animal fossils of the Doushantuo Formation are for the most part younger than 580 million years old. The uppermost Doushantuo Formation contains a pronounced negative carbonate carbon isotopic excursion, which we interpret as a global event at circa 551 million years ago.