赣东北晚元古代港边岩浆混合杂岩体的区域地质调查及岩石学研究

Regional geological survey and petrological research of the Gangbian magma-mixed complex from northeastern Jiangxi Province

赣东北横峰县港边岩体是我国罕见的能在填图尺度上表示的岩浆混合杂岩体。该杂岩体出露于古江南造山带的南侧 ,实际上它是该造山带晚元古代增生柱内岩浆混合作用的典型产物。文章从地质学、岩相学和岩石地球化学等不同角度确证港边岩浆混合杂岩体形成于开放体系下岩浆演化的独特方式———岩浆混合作用。因此 ,我们在填图时没有采用封闭体系下岩浆演化的谱系单元 -超单元方法 ,而是以岩浆混合作用理论为基础 ,应用端员 -混合物

The Gangbian magma mixed complex from northeastern Jiangxi Province is an important constitute in the Late Proterozoic magma mixed zone in the southeastern margin of the Paleo Yangtz continent. This complex is actually a typical product of large scale of magmatic mixing occurred in the Later Proterozoic accreted column. Based on research of geology,petrology and petrochemistry etc,it is concluded that this complex is a special type of magmatic evolution under the open system. Therefore,the unit superunite mapping method which is based on magmatic evolution under a closed system is unfit for charting,a end member mixture end member mapping method is used into regional geological survey to effectively study and decomplex the complex according to the theory of magmatic mixing.