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The collision time of the Yangtze Block and the Cathaysia Block has been controversial for decades. This paper discusses the sedimentary provenance and tectonic setting through the analysis of the trace element characteristics. The study results suggests that the Yangtze Block and Cathaysia Block were still in collision between the Ordovician and Silurian. Keywords-Wuling depression; block; tectonic; trace element; shale

The Trace Element Characteristics of Shales from Upper Ordovician-Lower Silurian in Wuling Depression: Implication for Block Amalgamation Time and Tectonic Setting