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海南岛乐东地区志仲岩体锆石U-Pb年代学、Hf同位素研究及其构造意义

, PP. 294-307

Keywords: LA-ICP-MS,锆石U-Pb定年,Hf同位素,志仲岩体,海南岛

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Abstract:

海南岛分布大量的海西-印支期的花岗岩,关于这些花岗岩的成因及其成岩背景,特别是海西期花岗岩,一直是争论的焦点。本文采用LA-ICP-MS对海南岛乐东地区志仲花岗岩体进行了高精度的锆石U-Pb同位素年代学及锆石Hf同位素组成特征的研究。结果显示,两个花岗岩样品获得接近的272Ma的结晶年龄,表明该花岗岩体形成于早二叠世晚期。锆石原位Hf同位素组成εHf(t)值变化于-3.7至+2.8之间,对应的两阶段模式年龄tDM2集中在1.12~1.53Ga,表现出壳幔混合源区特征。据此,推测志仲花岗岩的形成岩浆很可能来源于海南中元古代火成岩的重熔,同时可能有新生地幔物质的加入。其两阶段模式年龄tDM2与前人研究的Nd二阶段模式年龄计算的结果(1.3~1.6Ga)相近,表明中元古代是该区一期重要的地壳分异的时间,即海南岛在中元古代发生过重要的地壳增生事件。结合区域构造-岩浆活动-沉积记录及古地磁资料,我们趋向于认为海南岛内海西期岩浆作用应该是古特提斯演化过程中构造-岩浆作用的产物,并非古太平洋西向俯冲-碰撞的结果。

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