Geochemical evidence for the formation and evolution of North Qinling microcontinent

被引：0
|
作者：
欧阳建平
张本仁
机构：
[1] China
[2] Institute of Geochemistry
[3] Wuhan 430074
[4] China University of Geoscienoes
来源：
Science China Earth Sciences | 1996年 / S1期
基金：
中国国家自然科学基金;
关键词：
Qinling orogenic belt; microcontinent; isotope mapping; mantle evolution; crustal growth;
D O I：
暂无
中图分类号：
P542.2 [];
学科分类号：
070904 ;
摘要：
Nd-Pb isotope and incompatible trace element compositions of the Precambrian basements, mantle-derived mafic rocks and feldspar of granite from East Qinling and its adjacent tectonic units are studied. It is concluded that the North Qinling was not part of the North China Craton, but an independent microcontinent in geological history. This microcontinent was built upon a newly formed continental crust derived from strong depleted mantle. It is also suggested that the microcontinent formed initially in an oceanic island setting as the margin of the North China Craton.
引用
收藏
页码：43 / 49
页数：7
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