Regional Correlation of Sinian Sedimentary of Central Cathaysia Block and Its Tectonic Significance:Evidence from Detrital Zircon Chro-nology
Sinian sedimentary strata widely spread in central Cathaysia Block with unitary lithology and influ-ences of subsequent tectonic-magmatic events,making it very difficult to find complete section with top and bottom in the area.Therefore,the Sinian strata correlation between the Cathaysia and Yangtze blocks has still been controversial.This research focuses on the area of the central Cathaysia Block,northern Guangdong and eastern Guangdong,to conclude the lithology characteristics of late Neoproterozoic strata as a set of abyssal and semi-abyssal deposits dominated by shallow metamorphic sandstone and siltstone interspersed with sili-ceous rocks,with high silica content on the bottom and top,by geological route survey.The results of U-Pb dating of detrital zircon show that its provenance has two significant peaks of～1000Ma and～650Ma,with relatively complex composition,which is a typical"Cathaysia-typed"provenance.Based on the above-men-tioned results,the Sinian strata in central Cathaysia Block could be well correlated to that of the other areas of the South China Block,indicating a united sedimentary basin in the central South China without a wide ocean.
Sinian SystemLA-ICP-MS U-Pb dating of detrital zirconmaterial sourcestratigraphic correla-tionCathaysia Block
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