摘要
文章对新台门钼矿取自花岗斑岩含矿石英脉中的5件辉钼矿样品进行了Re-Os同位素分析,获得模式年龄介于(177±4)～(185±1)Ma之间,加权平均年龄为(183±3)Ma(2σ,MSWD=1.6),表明该矿床形成于早侏罗世。结合区域岩浆活动和成矿作用的年代学格架,作者认为燕辽成矿带,特别是辽西地区的早侏罗世成矿作用非常重要,其形成应与印支期末华北板块与南北两侧大陆聚合后的伸展作用有关。
The Xintaimen molybdenum deposit is situated in eastern Yanshan-Liaoning metallogenic belt and the transitional zone between the western Liaoning depression and the Shanhaiguan-Beizhen uplift in North China. There are two ore types in the deposit： one is veinlet-dissemination type, and the other is fracture-filling type. As the former type ore possesses the dominant position, the authors consider that the deposit can be regarded as a porphyry type Mo deposit. Five molybdenite samples from the veinlet-dissemination type ore yielded Re-Os isotopic model ages ranging from （177 ± 4） Ma to （185 ± 1 ） Ma, and a weighted average age of （183±3） Ma a（2σ, MSWD= 1.6）. These data show that the porphyry type Mo mineralization occurred in Early Jurassic. According to chronological framework of regional magmatic activities and igneous mineralization, this paper holds that the Early Jurassic mineralization is very important in the Yanshan-Liaoning metallogenic belt, especially in western Liaoning area. The tectonic setting is supposed to be of an extensional process after continental collision between the North China plate and the Mongolia and Yangtze block in Late Indo-China epoch.
出处
《矿床地质》
CAS
CSCD
北大核心
2009年第3期313-320,共8页
Mineral Deposits
基金
国家重点基础研究发展计划项目(2006CB403501)
国家自然科学基金项目(40872050
40872064)的联合资助
关键词
地球化学
RE-OS同位素测年
斑岩钼矿
早侏罗世
燕辽成矿带
geochemistry, Re-Os isotopic dating, porphyry Mo deposit, Early Jurassic, Yanshan-Liaoning metallogenic belt
