赣北石门寺钨铜多金属矿床辉钼矿Re-Os同位素年龄及其地质意义
The Re-Os isotopic dating of molybdenite from the Shimensi tungsten-copper polymetallic deposit in the northern Jiangxi and its geological significance
刘更更 1吴颖宸 1魏文凤 1严冰 1邹志超1
作者信息
- 1. 成都理工大学 地球科学学院, 成都 610059
- 折叠
摘要
为了解赣北石门寺钨铜多金属矿床的钨富集机理及矿床成因,对该矿床中的辉钼矿开展了Re-Os同位素年代学研究.结果显示,6件辉钼矿样品的Re-Os模式年龄为140.2～142.5 Ma,加权平均年龄为(141.37±0.84)Ma(MSWD=0.84),等时线年龄为(141.79±0.97)Ma(MSWD=1.10),二者在误差范围内一致,可以代表辉钼矿的矿化年龄,指示该矿床的成矿时间为141 Ma左右.对赣北、赣中和赣南地区的成岩成矿年龄进行对比,发现三地的成岩成矿事件在时间上具有连续性.结合区域构造演化历程,本文认为石门寺钨铜多金属矿形成于早白垩世时期的伸展减薄环境.
Abstract
In order to explore the tungsten enrichment mechanism and metallogenesis of the Shimensi tungsten-copper polymetallic deposit in the northern Jiangxi,in this study,we have carried out the Re-Os isotopic dating of molybdenites of the deposit.The results show that six molybdenite samples have model ages varying from 140.2 Ma to 142.5 Ma,with a weighted mean age of(141.37±0.84)Ma(MSWD=0.84)and an isochron age of(141.79±0.97)Ma(MSWD=1.10),which are consistent within the standard deviation range and can be used to represent the mineralization age of molybdenite.Thus,the mineralization age of this deposit is about 141 Ma.On the basis of the above,we have made further comparison of diagenetic and metallogenic ages of tungsten polymetallic deposits in the northern,central and southern Jiangxi,and found that the diagenetic and metallogenic events in the three regions have continuity in time.Combined with the regional tectonic evolution history,we have suggested that the Shimensi tungsten-copper polymetallic ore deposit was formed in an extensional and thinning environment during the Early Cretaceous.
关键词
石门寺钨铜多金属矿床/Re-Os同位素/成矿年龄/赣北、赣中和赣南Key words
Shimensi tungsten-copper polymetallic deposit/Re-Os isotopes/metallogenic age/the northern,central and southern Jiangxi引用本文复制引用
基金项目
矿床地球化学国家重点实验室开放基金(202006)
矿床地球化学国家重点实验室开放基金(202007)
出版年
2024
NETL
NSTL
维普
万方数据