大别山东部花岗岩类的稀土元素地球化学及其地质意义  

REE GEOCHEMISTRY AND GEOLOGICAL SIGNIFICANCE OF GRANITOIDS IN EASTERN DABIE MOUNTAINS

作　　者：胡雄星[1] 马东升[2] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室 [2]南京大学地球科学系,江苏南京210093

出　　处：《矿产与地质》2002年第6期321-326,共6页Mineral Resources and Geology

基　　金：国家攀登计划预选项目 (项目编号 :95 -预 -3 9)资助

摘　　要：在研究大别山东部主要花岗岩体的稀土元素地球化学特征、稀土元素配分型式的基础上 ,探讨了花岗岩体的物质来源、成岩模式及其构造意义。研究表明 :(1)大别山东部出露的主要花岗岩类岩体的物质来源基本相同 ,且源区具有古岛弧的特征 ;(2 )各岩体的成岩模式呈现以分离结晶作用为主的特征 ;(3)花岗质岩浆上侵的构造环境与中国东部燕山期构造转折的大背景有关。伸展拉张过程造成的地幔上涌不但是花岗岩类形成的构造条件 ,也对超高压变质岩的快速折返有重要影响。REE geochemical characteristics of the main granitoids rock masses in eastern Dabie Mountains of China are investigated.Based on the researches,origin of substance,lithogenetic pattern and structural implications of granitoids are discussed.Research shows:(1)The substance origins of different granitoids rock masses are similar and the source of granitic magma is possibly from old island arc.(2)The main lithogenetic pattern of granitoids rock masses is fractional crystallization.(3)The upper intrusion of granitic magma is related to Yanshan movement in Eastern China.Mantle upswelling formed by extension process is not only the structural conditions of granitoid formation,but also has great influence on the fast exhumation processes of UHP metamorphic rocks.

关 键 词：地球化学 稀土元素 物质来源 花岗岩类 分离结晶作用 成岩模式 折板过程 大别山 

分 类 号：P588.121[天文地球—岩石学] P59[天文地球—地质学]