Sm-Nd age dating of high-pressure granulites and amphi-bolite from Sanggan area,North China craton

被引：0
|
作者：
GUO Jinghui & ZHAI MingguoInstitute of Geology and Geophysics
机构：
来源：
Science Bulletin | 2001年 / 02期
基金：
中国国家自然科学基金;
关键词：
Sm-Nd dating; high pressure granulite; Paleoproteroz-oic collision; North China craton;
D O I：
暂无
中图分类号：
P597 [同位素地质学与地质年代学];
学科分类号：
070902 ;
摘要：
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) Ma for HP 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 broken down during decompression, all these isochron ages are thought to be HP 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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页码：106 / 111
页数：6
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