赣东北早古生代火山侵入杂岩的发现及地质意义  

DISCOVERY OF EARLY PALAEOZOIC VOLCANIC AND INTRUSIVE COMPLEX ROCKS FROM GANGDONGBEI DISTRICT,JIANGXI PROVINCE AND THEIR GEOLOGICAL SIGNIFICANCE

作　　者：廖群安[1] 薛重生[1] 李昌年[1] 樊光明[1] 

机构地区：[1]中国地质大学地球科学学院

出　　处：《地质科技情报》1998年第4期15-18,共4页Geological Science and Technology Information

基　　金：国家计委和原地矿部"八五"地勘专项"上饶地区1:5万区域遥感地质调查项目

摘　　要：通过对赣东北横峰港边火山侵入杂岩的地质学、同位素年代学及岩石学的研究发现，该火山侵入杂岩并非晋宁期岩浆活动的产物，其Ｓｍ－Ｎｄ同位素年龄为（５８４±７７）Ｍａ，归属早古生代。火山侵入杂岩在空间上密切共生，成因上具密切联系，均属钙碱性系列，为典型的岛弧火山岩组合。这一研究成果，对于重新认识江南造山带具重要的意义。Based on the studies of the geology,Sm Nd isotopic age and petrology of Gangbian volcanic and intrusive complex rocks from Hengfeng,Jiangxi Province,it is suggested,that the complex rocks were formed at Early Palaeozoic (584±77)Ma ,and belong to calc alkaline series.The volcanic and intrusive complex rocks closely associated temporally and spacially are different in petrochemistry and geochemistry,but all were formed in arc setting.To reconsider the Jiangnan orogenic zone these are very important conclusions following the discovery of Early Palaeozoic fossils group in this area in early days (1995-1996).

关 键 词：火山侵入杂岩 杂岩 钐-钕同位素 地质年龄 

分 类 号：P588.36[天文地球—岩石学]