吉林中部地区钼矿Re-Os同位素年代学及其地质意义

Re-Os isotopic geochronology of the Mo deposits in central Jilin Province and its tectonic implications

通过对吉林中部地区主要钼矿Re-Os同位素年代学研究,获得大石河辉钼矿模式年龄(185.6±2.7)Ma、大黑山辉钼矿模式年龄(169.8±2.7)Ma、大冰湖沟辉钼矿模式年龄(192.4±3.0)Ma、新安屯辉钼矿模式年龄(195.7±3.1)Ma。同时对吉林中部地区钼矿成矿时代、构造背景进行初步研究分析,结合区域已有的研究成果,认为吉林中部地区主要钼矿形成于燕山早期(165～195Ma),其成矿构造背景与太平洋板块向欧亚大陆俯冲关系极为密切。

Through the study on Re-Os isotopic chronology of major molybdenum minerals,in central Jilin Province,we get the model ages in Daheishan Molybdenite mine(169.8±2.7)Ma,Dabinghugou Molybdenite mine(192.4±3.0)Ma,Xin’antun Molybdenite mine(195.7±3.1)Ma.At the same time,this paper preliminarily analyzed the metallogenic epoch and tectonic setting of molybdenum deposits in central Jilin.Combined with the existing research results in the region,we think the metallogenic epoch of molybdenum deposits in central Jilin is in Early Yanshanian(165~195Ma).The tectonic setting is closely related to the subduction of the Pacific plate to Eurasia.