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地质通报  2007 

南秦岭勉县-略阳缝合带印支期光头山埃达克质花岗岩的成因及其地质意义

, PP. 466-471

Keywords: 南秦岭先头山岩体黑云母斜长花岗岩埃达克岩岩石成因后碰撞期

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Abstract:

勉略缝合带北侧的印支期光头山黑云母斜长花岗岩的地球化学研究表明,该套岩石SiO2≥56%,Al2O3〉15%,Na2O〉K2O,富集LILE和LREE,负Eu异常不明显,强烈富集Sr(Sr=704.61~1052.81μg/g,平均为828.45μg/g)和亏损Y(Y=7.17~9.68μg/g,平均为7.66μg/g),高Sr/Y比值(80.74~281.41),表现出明显的埃达克岩的地球化学性质。结合岩体产出的时空位置,认为光头山岩体形成于典型的后碰撞构造环境,可能是三叠纪华北和扬子两大板块的碰撞作用导致俯冲板片断离、软流圈物质上涌底侵、下地壳增厚并熔融,产生了具有埃达克性质的熔体和含石榴子石的残余相。

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