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 relationshipwith molybdenum mineralization

作　　者：刘欣[1] 张森 洪汉烈 金珊合 钟辉[1] 伍月[1] 鞠楠[1] 施璐 LIU Xin;ZHANG Sen;HONG Hanlie;JIN Shanhe;ZHONG Hui;WU Yue;JU Nan;SHI Lu(Shenyang Center of China Geological Survey(Northeast S&T Innovation Center),Shenyang 110034,Liaoning,China;Cores and Samples Centre of Nature and Resources,Langfang 065201,Hebei,China;China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[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4300741

出　　处：《地质通报》2024年第8期1417-1429,共13页Geological Bulletin of China

基　　金：国家自然科学基金项目《碱性岩浆作用中铌钽元素富集机制研究:以辽东地区赛马铌钽矿床为例》(批准号:42102087);自然资源部深地动力学重点实验室开放研究课题《幔源岩浆作用与铌钽元素富集成矿关系研究》(编号:J1901-16);中国博士后科学基金《辽东地区碱性岩型铌钽矿床成因研究》(编号:2022M712966)。

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。Qichun Liemazui molybdenum mine in Hubei Province is located on the southern slope of Dabie Mountain.Proven largemolybdenum mines are rarely reported.There are few in−depth studies on this mining area,and there is a lack of accurate determinationof the diagenetic and mineralization age,genesis and tectonic setting.In this paper,the Liemazui ore−forming granite was selected forpetrographic,and petrochemical studies.The experimental results indicate that the ore−forming rocks are porphyry monzogranite ormonzogranite−porphyry by petrographic analysis.The ore−forming scale of the mining area is small.The ore is disseminated or veineddisseminated.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 areenriched,and the heavy rare earth elements are relatively deficient.The rocks related to metallogenic formation in the Liemazuimolybdenum mining area were formed in the extensional environment of the Dabie orogenic belt,and were related to the thinning ofthe 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 

分 类 号：P618.51[天文地球—矿床学] P588.121[天文地球—地质学]