Was there a Cambrian ocean in South China? – Insight from detrital provenance analyses
Was there a Cambrian ocean in South China? – Insight from detrital provenance analyses
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DOI：
10.1017/s0016756814000338
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发表时间：
2014-07
影响因子：
2.3
通讯作者：
W. Yao;Zheng‐Xiang Li;Wu-Xian Li
中科院分区：
文献类型：
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作者：
W. Yao;Zheng‐Xiang Li;Wu-Xian Li
本文利用寒武纪砂岩碎屑物源资料，研究了中国南部扬子地块和华夏地块在寒武纪是否被大洋隔开。寒武纪砂岩中的锆石在扬子地块中部以~800 Ma的年龄峰为主，来自扬子地块西部，而在华夏地块西北部以~980 Ma的年龄峰为主，来自曾经与华夏相连的外来大陆。在扬子地块东南部寒武系砂岩中发现了两个年龄峰的混合物源，表明碎屑可以从华夏地块运往扬子地块，从而证明了广阔的寒武纪大洋的存在。
Abstract We use detrital provenance data from Cambrian sandstones to examine whether the Yangtze and Cathaysia blocks in South China were separated by an ocean during the Cambrian period. Zircons from the Cambrian sandstones exhibit a dominant ~ 800 Ma age peak in the central Yangtze Block, being sourced from the western Yangtze Block, whereas a ~ 980 Ma peak dominates in the northwestern Cathaysia Block, being sourced from an exotic continent once connected to Cathaysia. A mixed provenance with both age peaks is found in Cambrian sandstones from the southeastern Yangtze Block, indicating that detritus can travel from the Cathaysia Block to the Yangtze Block, and therefore arguing against the existence of a broad Cambrian ocean.