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Nd, Sr, Pb isotopic geochemistry of the alkali-rich intrusive rocks in East Qinling, central China and its tectonic significance
Author(s): 
Pages: 455-461
Year: Issue:  5
Journal: GEOCHIMICA

Keyword:  富碱侵入岩同位素地球化学东秦岭地区;
Abstract: 东秦岭北部富碱侵入岩主要分布在陕西省洛南与河南省卢氏-确山一带,岩石有碱性岩、碱性花岗岩和石英正长岩三大类.岩石Nd、Sr和Pb同位素地球化学的研究表明,该区富碱侵入体的源区应是以下地壳为主,并通过碰撞造山作用带入少量地幔和上地壳物质.源区同位素组成横向与垂向的不均一性说明华北块体存在成熟的下地壳层,而北秦岭块体是造山带环境.古大陆边缘经历了多次裂解作用和多期碱性岩浆活动;碱性岩浆是在减压扩容环境中再次熔融侵位,形成于松弛和张性构造环境.
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