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BASIC OUTLINE AND TECTONIC EVOLUTION OF THE METAMORPHIC BASEMENT IN THE SOUTH CHINA SEA

Liu Yixuan;Zhan Wenhuan(South China Sea Institute of Oceanology,Academia Sinica)  
The basic outline of the metamorphic basement in South China Sea is a mosaic folding basement with thefeature of senile basement located in the center and neobasement to the periphery of South China Sea,The Precambrianmetamorphic basement was found in waters of the Xisha Isles in central South China Sea Surrounding this paleoland-mass , the Caledonian , Hercynian,and Indo- Chinese epoch folding basements were developed in the periphery area. Thetectonic cvolution in South China is considered to be significantly complicated.The area experienced divergence and con-vergence of South China and Indo- Chinese massifs many times,forming the Jinning,Caledonian , Hercynian,Indo-Chi-nese folding metamorphic zones from the Proterozoic to the Paleozoic era and further exporienced the subduction of theKula-Pacific plate,forming the “Andes continental margin”in the Mesozoic,and later experienced the continental margin-spreading,forming the modern tectonic framework in the Cenozoic.
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