川西里伍铜矿黑云母矿物化学特征及成矿指示意义  

Chemical composition andmetallogenic significance of biotite from the Liwu copper deposit,western Sichuan Province

作　　者：邹文 李同柱[2] 管桦 何立夫 张才森 ZOU Wen;LI Tongzhu;GUAN Hua;HE Lifu;ZHANG Caisen(Jiulong Yalongjiang Mining Co.,Ltd.,Ganzi 626200,Scichuan,China;Chengdu Center,China Geological Survey,Chengdu 610081,Sichuan,China)

机构地区：[1]九龙县雅砻江矿业有限责任公司,四川甘孜626000 [2]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《沉积与特提斯地质》2020年第1期60-67,共8页Sedimentary Geology and Tethyan Geology

基　　金：中国地质调查局成都地质调查中心项目(编号:CDG2019-KF-SK-001);国家自然科学基金青年科学基金项目(编号:41902068)的联合资助。

摘　　要：为了查明川西里伍铜矿黑云母的成因类型、形成的物理化学条件及成矿指示意义,本文对矿化蚀变带中的黑云母开展了电子探针分析。结果显示黑云母具有高SiO2(平均34.67%)、Al2 O3(平均19.20%)、FeO(平均22.45%)、MgO(平均7.96%)、K2O(平均9.37%)特征,属于铁质黑云母。形成于低的氧逸度、中高温(平均531°C)、较大压力(平均3.99 kbar)与深度(平均深度为15.08 km)的环境。结合前人研究认为,里伍铜矿矿化蚀变带中的黑云母是原生黑云母重结晶改造而成,里伍式富铜矿床与江浪穹窿成穹过程中的变形-变质作用具有成因联系。In order to ascertain the genetic type,physicochemical conditions and metallogenic significance,electron probe analysis of biotite in alteration zone of the Liwu copper deposit is carried out in this paper.The results show that these biotite grains:(1)have high SiO2(average 34.67%),Al2 O3(average 19.20%),FeO(average 22.45%),MgO(average 7.96%)and K2O(average 9.37%)contents,and are primary iron biotite;(2)were formed in low oxygen fugacity conditions,medium to high temperature environment(average 531°C)and high pressure(average 3.99 kbar).Combined with previous data,it is believed that biotite in the Liwu copper deposit is probably formed by recrystallization of primary biotite,and the Liwu-type high-grade copper deposit is most likely related to the deformation-metamorphism during the doming process of the Jianglang dome.

关 键 词：黑云母 矿物化学 成矿意义 里伍铜矿 江浪穹窿 

分 类 号：P581[天文地球—岩石学]