Journal
CHINESE SCIENCE BULLETIN
Volume 46, Issue 2, Pages 106-111Publisher
SCIENCE PRESS
DOI: 10.1007/BF03187002
Keywords
Sm-Nd dating; high pressure granulite; Paleoproterozoic collision; North China craton
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The high pressure (HP) metamorphic age has been dated to HP rocks from the Sanggan area, North China craton. We have got garnet+whole rock isochron ages of (1 842+/-38) hla for PIP granulite, and (1 856 +/- 26) Ma for HP amphibolite. The Sm-Nd whole rock isochron of HP granulites give out an age of (1870+/-150) Ma with Nd depleted mantle model age of (2402-2 482) Ma. Considering the Nd isotope homogenization during the peak metamorphism of the HP granulite, Sm-Nd closure temperature and the retention of Nd isotopic memory in garnets partially brokers down during decompression, all these isochron ages are thought to be HE metamorphic age. Furthermore, we proposed that the HP metamorphism took place at the end of Paleoproterozoic during the large-scale collision and assembly of the North China craton.
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