Modern-style Subduction Processes in the Archean:Evidence from the Shangyi Complex in North China Craton

被引：0

作者：

WANG RenminWAN YushengCHENG Suhua and FENG Yonggang The School of Earth and Space SciencesPeking UniversityBeijing China Institute of GeologyChinese Academy of Geological SciencesBeijing China School of the Earth Science and ResourcesChina University of GeosciencesBeijing China ^{[1
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机构：

来源：

ActaGeologicaSinica(EnglishEdition) | 2009年 / 83卷 / 03期

关键词：

low-Al2O3; tonalite; Nb-enriched basalts; intra-oceanic arc; Archean ancient oceanic crust; North China craton;

D O I：

暂无

中图分类号：

P56 [区域地质学];

学科分类号：

0709 ; 081803 ;

摘要：

<正>Three fragments of the Archean oceanic crust have been found between the Archean granulite belt and the Paleo-Proterozoic Hongqiyingzi group in North China craton,which spread along the Shangyi-Chicheng ancient fault.This paper presents integrated field,petrology,geochemistry and geochronology evidence of the ancient oceanic fragments.The magma crystallizing age of the tonalite in the Shangyi complex is 2512±19 Ma and the geochemical characteristics suggest that the Nb-enriched basalts may be related to crustal contamination and formed in the intra-oceanic arc of the supra subduction zone setting.

引用

页码：535 / 543

页数：9