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地球学报  2011 

扬子板块西北缘碧口地块南一里花岗岩成因研究

DOI: 10.3975/cagsb.2011.05.06

Keywords: 南一里花岗岩,地球化学,岩石成因,地壳深熔,碧口地块

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Abstract:

本文对扬子板块西北缘南一里岩体进行了系统的地球化学研究,探讨了该岩体的岩石成因、成岩物质来源及其地质意义。该岩体具有高SiO2(70.27%~71.21%)、Al2O3(14.97%~16.19%)、K2O(3.11%~3.83%)含量,A/CNK=1.04~1.08,以低Y(<10.01×10-6)和HREE(e.g.Yb<0.70×10-6)为特征,富集Rb、Th、U、K、Sr,亏损Ba、Nb、Ta、P和Ti,稀土总量73.55×10-6~93.86×10-6。Eu异常不明显(0.67~0.83)。具有较高的Sr/Y(33.01~50.53)和(La/Yb)N(15.30~23.04)比值及强分异的稀土元素组成。结合岩体产出的时空位置,表明南一里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板块的碰撞作用导致该区地壳明显增厚,在伸展-减薄的构造体制下,地壳中变玄武质和泥质岩石通过角闪岩脱水发生部分熔融形成。

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