摘要
小干沟金矿点位于内蒙古呼伦贝尔盟额尔古纳市吉拉林砂金矿西约５ｋｍ处．小干沟金矿点的发现（内蒙古地勘局第六勘察院，１９９６）为在该区大面积分布的海西期花岗岩中寻找岩金矿及探索吉拉林等砂金矿的形成具有重要意义．笔者在小干沟金矿点发现了侏罗纪末期侵位的二长岩，并初步确定该金矿化与二长岩关系密切．
he authors discovered the Xiaogangou monzonite in the southern margin of the ErgunaXing’an block where the Xiaogangou gold ore spot located. The research confirms that:1.The Xiaogangou monzonite was formed in late Jurassic.The wholerock KAr age is 145.1±4.8Ma,while the Kfeldspar KAr age of the pegmatite is 147.0±7.8Ma.2.There are several types of gold depsits in Xiaogangou,but the altered monzonite is the main one among them.3.The Kfeldspar KAr age of the altered rock,137.3±6.1Ma,shows that there is a very close relationship between the Xiaogangou gold ore and the monzonite on alteration and mineralization.
基金
地质矿产部资源与环境科技攻关课题
关键词
二长岩
金矿床
矿化
地质意义
内蒙古
Xiaogangou monzonite goldmineralization middle section of Derbugan mineralization belt Inner Mongolia
