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地质论评  2012 

广西那龙地区中三叠世火山岩地球化学特征及构造意义

Keywords: 右江盆地,中三叠世,锆石UPb年龄,地球化学,岛弧火山岩,古特提斯洋

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Abstract:

右江盆地西南缘广泛出露早―中三叠世火山岩,目前对这些火山岩没有精确的年代学和地球化学研究。本文选择广西那坡县那龙地区下三叠统罗楼组与中三叠统百逢组之间的一套厚层状分布的火山岩作为研究对象,对其进行了LAICPMS锆石UPb同位素定年、锆石主微量元素及全岩的地球化学研究。锆石206Pb/238U同位素年龄为241?2±1?9Ma(MSWD=0?69),代表火山岩的结晶年龄。锆石稀土元素总量较高,富集重稀土元素,具有明显Eu负异常及Ce正异常,含有较低的Th、Th/U、Ce/Sm和δEu值及相对较高的Hf、Yb/Gd和U/Ce值,指示原岩岩浆源区有地壳熔体的组分。火山岩全岩SiO2含量为51?28%~56?17%,并显示低TiO2含量(0?79%~1?28%)和高Al2O3含量(13?52%~15?51%)的特征。稀土元素地球化学特征表现为Eu负异常(δEu=0?60~0?71),富集大离子亲石元素(Rb、Cs、Ba、U、Sr、Pb、Th、K)和轻稀土元素而亏损高场强元素(Nb、Ta、Zr、Hf、P、Ti)及重稀土元素,与岛弧火山岩的特征一致。Ce/Pb及Nb/U值接近大陆地壳,Zr/Y值和Zr含量偏高,表明原始岩浆源区可能为地壳熔体和俯冲洋壳熔体组成的混合物,岩浆在形成上升过程中有深海沉积物或地壳物质的加入,岩石成因与俯冲作用有关。但Ba/Th值(2?92~69?75)小于300,表明原始岩浆在上升过程中受到流体混染的程度比较小。结合前人研究成果可得出,广西那龙中三叠世岛弧火山岩的发现,代表早中生代古特提斯洋东延部分存在一个俯冲消减带。

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