【作者】 刘红旭； 陈祖伊； 郭华； 王润红；

【Author】 Liu Hong-xu;Chen Zu-yi;Guo hua;Wang Run-hong;Beijing Research Institute of Uranium Geology;China Railway Resources Ltd.;

【机构】 核工业北京地质研究院； 中铁资源有限公司；

【摘要】 基于海拉尔盆地东缘海西早期花岗闪长岩岩石地球化学特征研究,该花岗闪长岩为钙碱性花岗闪长岩,其源区主要为软流圈地幔,同时有下地壳物质的混染;初步判定其形成环境为洋内岛弧环境,属不成熟岛弧,其相应的地壳成熟度不高,这在一定程度上制约了盆地后期砂岩型铀成矿作用。但随后强烈的中生代岩浆活化作用在很大程度上提升了该区地壳成熟度,在一定程度上提升了这一地区砂岩型铀成矿的潜力。更多还原

【Abstract】 The study on the geochemical characteristics of early Hercynian granodiorite at the eastern margin of Hailaer Basin indicates that the rocks belong to calc-alkaline granodiorite;their source region was most likely an asthenospheric mantle with lower crust involvement.It is considered that the rocks were formed under the tectonic setting of ocean island arc belonging to immature island arc,and the degree of crustal maturity was not high,which limited the sandstone-type uranium mineralization in a way.However,the magmatic activation of the Mesozoic upgraded the crustal maturity,and the mineralization potentiality of sandstone-type uranium increased to some extent.更多还原