福建砺山钼矿的地质特征、成矿时代及区域找矿前景

GEOLOGICAL CHARACTERISTICS AND METALLOGENIC EPOCH OF THE LISHAN MOLYBDENUM DEPOSIT—A DISCUSSION ON REGIONAL PROSPECTING FOR MO IN THE SOUTHEASTERN COAST OF CHINA

我国东南沿海钼矿点星罗棋布,但大中型矿床少见。福建仙游县的砺山钼矿是近年来找矿进展比较大的钼矿之一,找矿前景看好。本文简要介绍了矿区的地质背景及矿床特征,并采用Re-Os同位素测年方法对矿区所采辉钼矿样品进行了测试,获得等时线年龄为91.7±4.9Ma,结合区域上其他钼矿床的地质特征、成矿时代以及我国东南沿海钼矿成矿带的特点,认为在闽东地区乃至整个东南沿海钼矿的找矿工作具有良好的前景。

There are lots of small-scale molybdenum deposits in the southeastern coast of China, whereas there are few middle-and large-scale ones. The Lishan is one of the molybdenum deposits where great development has been made in exploration in recent years and there is a good prospecting potentiality. The deposit is located in the Wulijie-Xiany- ou Pb, Zn, Cu, Fe, W, Mu polymetal belt with an E-W strike. It is hosted by quartz diorite, and closely correlated to the rhyolite porphyry veins during the mineralization. This paper has provided an isochron age of molybdenites from this deposit 91.7 ±4. 9 Ma （ by the Re-Os dating method）. Combined with the geological characteristics, metallogenie epoch of other molybdenum deposits nearby and the basic metallogenic rule of the molybdenum metallogenic belt in eastern China, it is suggested that the Fujiang Province, even the whole molybdenum metallogenie belt in the southeastern coast of China, has a good prospecting potentiality for molybdenum deposits.