福建省永定山口钼矿辉钼矿铼-锇同位素定年及其地质特征

Re-Os Isotopic Dating of Molybdenite from the Shankou Molybdenum Deposit in Yongding County of Fujian Province and Its Geological Significance

福建永定山口钼矿位于武夷山北东-北北东构造带南段与南岭东西向构造带东段的复合部位,受上杭—云霄北西向断裂控制的湖雷早侏罗世火山喷发盆地的西北侧边缘,是目前福建省近年来钼矿地质找矿工作取得重大进展的矿床之一,也是已发现赋存于早侏罗世火山岩及火山碎屑沉积岩中仅有的一个中型钼矿床。文章通过采集钻孔中的辉钼矿进行铼-锇同位素年龄测定,获得辉钼矿等时线年龄为(165.3±3.5)Ma,表明该矿床形成于燕山早期,说明武夷山成矿带存在南岭成矿带相类似的成矿作用,为寻找南岭成矿带相类似成矿作用的找矿工作提出新的方向和新的思路。

The Shankou molybdenum deposit in Yongding is one of the molybdenum deposits with great progress in geologieal and mineral exploration in recent years. The mine area is located in the complex place of south part of the northeast （NE） -north-northeast （NNE） Wuyishan tectonic belt and the east part of the latitudinal Nanling tectonic belt. It is at the northwestern margin of Early Jurrasic volcanic eruption Hulei Basin which is controlled by the northwest Shanghang-Yunxiao fault. Until now, it is the only discovered middle scale molybdenum deposit occurring in the Early Jurrasic volcanic rocks and pyroclastic sedimentary rocks. In this papar, the Re-Os isoehron age of （ 165.3 ＋ 3.5 ） Ma for molybdenite samples from drilling holes was obtained. It suggests this deposit formed in the Early Yanshanian period and there is similar mineralization between the Nanling metallogenetie belt and the Wuyushan metallogenetic belt. It provides a new orientation for ore-prospeeting in the metallogenetie belts with the similar mineralization to the Nanling metallogenetic belt.