NEW RECOGNITION OF KANGDING-MIANNING METAMORPHIC COMPLEXES FROM SICHUAN, WESTERN YANGTZE CRATON: EVIDENCE FROM Nd ISOTOPIC COMPOSITION
Chen Yuelong
Luo Zhaohua
LIU Cui
Abstract：The Kangding Group, outcropping around the northern segment of the western Yangtze craton, has been regarded as a typical Archean high-grade terrain for a long time. The Kangding-Luding and Mianning complexes are representatives of the group. An Sm-Nd isochron of 706Ma was first obtained through the systematic determination of Sm-Nd isotopic composition in the amphibolites-TTG gneisses from the Shaba, Mianning county, Sichuan Province. The isochron and Nd depleted mantle model ages of other samples show that the complexes were metamorphic and anatectic products of Neoproterozoic mafic-ultra-mafic rocks after breakup of Rodinia by a mantle plume. All these evidences suggest that the present outcropping basements of the Yangtze craton are free of a united evolutionary history. Therefore, further study should be made of the basements of the Yangtze craton.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 279-285 )