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海南晨星安山质火山岩地球化学、年代学特征及其构造意义

, PP. 99-108

Keywords: 安山质火山岩,元素地球化学,锆石LA?ICP?MSU?Pb年代学,海南晨星地区

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Abstract:

海南晨星地区发育一套变安山质火山岩,呈透镜状或层状夹于晚古生代变沉积地层中。该安山质火山岩SiO2含量为52.87%~65.27%;富Al2O3(15.59%~21.55%),具有较高的稀土元素丰度(ΣREE=166.80×10-6~246.21×10-6),平均204.39×10-6,(La/Yb)N=5.78~7.47,(Gd/Yb)N=1.24~1.58;大离子亲石元素富集、高场强元素Nb?Ta和Ti?P亏损明显,Eu弱负异常(δEu=0.72~0.90);在Nb/Y?(Zr/TiO2)×10-4和La/Yb?Sc/Ni图解上落入安山质大陆岛弧型火山岩区。火山岩样品10HN13B的LA?ICP?MS锆石U?Pb年代学测试表明,该安山质火山岩形成年龄为345±4Ma,表明在早石炭世晚期(~345Ma)在海南中部存在有安山质弧岩浆作用。该年龄的获得表明晨星地区夹持该安山质火山岩的原下二叠统峨查组很可能为一套石炭-二叠纪海相火山-碎屑沉积建造,或需要进一步解体。

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