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Study on geochemical characteristics and genesis of Xiazhuang granite,northern Guangdong
Author(s): 
Pages: 65-71
Year: Issue:  2
Journal: URANIUM GEOLOGY

Keyword:  地球化学过铝质花岗岩下庄岩体;
Abstract: 印支期下庄花岗岩是粤北贵东复式花岗岩体的重要组成部分,其岩石的主要元素显示出富硅、富碱、过铝质等特征;微量元素表现为富集Rb、Th、U、Ce、Sm、Y,亏损Ba、Sr、P、Ti;LREE轻微富集(LREE/HREE=7.54~11.18,(La/Yb)N=7.36~16.03),Eu亏损明显(δEu=0.24~0.33);构造环境判别显示下庄花岗岩属于后碰撞花岗岩范畴.这些特征表明,下庄岩体属于典型的壳源型花岗岩,是在地壳伸展减薄的构造背景下,通过以泥质岩和砂质岩组成的古元古代变质沉积岩部分熔融而形成.
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