湖北蕲春烈马咀花岗岩成因及与钼成矿的关系
The genesis of Qichun liemazui granite and its relationship with molybdenum mineralization
刘欣 1张森 2洪汉烈 3金珊合 1钟辉 1伍月 1鞠楠 1施璐1
作者信息
- 1. 中国地质调查局沈阳地质调查中心(东北地质科技创新中心),辽宁沈阳 110034
- 2. 自然资源实物地质资料中心,河北廊坊 065201
- 3. 中国地质大学(武汉),湖北武汉 430074
- 折叠
摘要
湖北蕲春烈马咀钼矿位于大别山南坡,已探明的大型钼矿鲜有报道,对该矿区的深入研究甚少,缺少对成岩成矿时代、成因和构造背景的准确厘定.对烈马咀钼矿及与成矿有关的花岗岩进行了岩相学、岩石地球化学研究和Re-Os同位素测年.结果表明:与成矿有关的岩石为斑状二长花岗岩或二长花岗斑岩,矿区成矿规模小,矿石为浸染状或细脉浸染状展布;辉钼矿等时线年龄为 119±8 Ma,年龄加权平均值为 118.9±0.98 Ma,指示烈马咀钼矿为早白垩世热液产物;岩石地球化学数据表明其为高硅、高钾钙碱性系列A型花岗岩;稀土元素的总含量高,轻稀土元素含量相对富集,重稀土元素含量相对亏损.烈马咀钼矿区与成矿有关的岩石形成于大别造山带伸展环境,与燕山晚期岩石圈减薄有关.
Abstract
Qichun Liemazui molybdenum mine in Hubei Province is located on the southern slope of Dabie Mountain.Proven large molybdenum mines are rarely reported.There are few in-depth studies on this mining area,and there is a lack of accurate determination of the diagenetic and mineralization age,genesis and tectonic setting.In this paper,the Liemazui ore-forming granite was selected for petrographic,and petrochemical studies.The experimental results indicate that the ore-forming rocks are porphyry monzogranite or monzogranite-porphyry by petrographic analysis.The ore-forming scale of the mining area is small.The ore is disseminated or veined disseminated.The isochronous age of molybdenite in liemazui deposit is 119±8 Ma,the weighted mean age was 118.9±0.98 Ma.Therefore,the Liemazui molybdenum deposit is formed in the Early Cretaceous.Geochemical data show that it is a high-silicon,high-potassium,calc-alkaline series A-type granite.The total amount of rare earth elements is high,the light rare earth elements are enriched,and the heavy rare earth elements are relatively deficient.The rocks related to metallogenic formation in the Liemazui molybdenum mining area were formed in the extensional environment of the Dabie orogenic belt,and were related to the thinning of the lithosphere in the Late Yanshanian period.
关键词
烈马咀花岗岩/辉钼矿/岩石地球化学/Re-Os同位素测年/湖北Key words
Liemazui granite/molybdenite/petrochemical/Re-Os isotopic dating/Hubei Provincce引用本文复制引用
基金项目
国家自然科学基金项目(42102087)
自然资源部深地动力学重点实验室开放研究课题(J1901-16)
中国博士后科学基金(2022M712966)
出版年
2024
国家科技期刊平台
NSTL
万方数据