九瑞地区中生代岩浆活动及其大地构造意义  

Magmatism and Geotectonic Signification in Mesozoic Era in Ruichang,Jiujiang area

作　　者：罗小洪[1] 

机构地区：[1]江西省地质调查研究院,江西南昌330201

出　　处：《东华理工学院学报》2006年第2期121-126,共6页Journal of East China Institute of Technology

基　　金：国土资源部自由探索研究项目资助(B2-35)

摘　　要：通过对该地区中生代不同时期形成的花岗岩的研究,认为该区主成矿期前（160～200 Ma）形成C型埃达克岩,这时的地壳是增厚的地壳（〉40 km）,随后在该地区的软流圈地幔上涌和岩石圈的伸展减薄作用过程中,形成I型花岗岩（130～160 Ma）及其有关矿床,达到该地区铜金成矿高峰期,随着地壳减薄作用进一步加强,岩浆活动和成矿作用减弱.不但强调I型花岗岩的成矿专属性,而且也强调成矿时间、大地构造环境转换期成矿.The granite formed in different period of Mesozoic era in Ruichang, Jiujiang area is studied. It ts think that C-type adakite is formed before main metallogenic epoch （160 -200 Ma） and the crust is thickening in this area. After that time, the I -type granite and related mineral is formed in the process of upweUing of asthenosphere mantle and stretching and tapering of lithosphere. The time is peak of the copper-gold mineralogenetic. The magmatism and metaUization is weakening with attenuation of crust strengening. The metallogenic attribute of I -type granite , metaUogenic epoch and metaUogenic in geotectonic environmental transition is emphasized.

关 键 词：C型埃达克岩 大地构造环境转换 成矿 九瑞 

分 类 号：P545[天文地球—构造地质学]