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地质学报  2004 

江西大吉山五里亭花岗岩单颗粒锆石U-Pb同位素年龄及其地质意义探讨

, PP. 352-358

Keywords: 花岗岩,锆石U-Pb年龄,印支期,五里亭,大吉山

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Abstract:

江西大吉山五里亭花岗岩一直被认为是与大吉山钨矿有关的早阶段花岗岩体,时代为燕山早期。但实际上大吉山地区各阶段花岗岩体之间的时空关系并不清楚,前人的某些年龄数据也存在相互矛盾之处。本文利用单颗粒锆石U-Pb化学法,对五里亭花岗岩进行了年代学研究,获得238.4±1Ma的岩体侵位年龄,这个年龄属印支期。本文还结合某些岩石学、地球化学特征研究及与相邻岩体的对比,认为五里亭花岗岩确应归属于印支期,因此,五里亭岩体与大吉山钨矿没有成因上的直接联系。五里亭花岗岩侵位年龄的厘定和该地区更多印支期花岗岩的不断发现,表明印支运动在华南的影响超出了人们以往的认识。在此基础上,本文还对华南印支运动和印支期花岗岩的问题进行了简单的讨论

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