摘要
康定群五马箐组是四川米易海塔地区混合岩型铀矿的赋矿地层。文章对五马箐组中的蚀变斜长角闪岩进行了系统的岩相学、矿物地球化学、变质温压条件估算研究,探讨了该地区变质作用与铀成矿的关系。研究结果表明:米易海塔地区的变质岩经历了1个变质作用阶段和2个后期流体蚀变阶段。峰期变质阶段的温压条件为523~608℃和0.18~0.40 GPa,后两期流体蚀变阶段的温度为264~334℃。海塔地区的早期铀矿化时代与区内的变质-混合岩化时代较为相近,峰期变质阶段的温压条件和后期流体蚀变阶段的温度条件与混合岩型铀矿的流体包裹体均一温度划分的两个大的成矿阶段基本一致,反映海塔地区的混合岩型铀矿经历了变质-混合岩化作用成矿和后期热液叠加改造作用成矿两个大的阶段。
The Wumaqing Formation of the Kangding Group is the ore-hosting strata for the migmatite-type uranium deposits in Haita, Miyi, Sichuan. In this paper, a systematic researches of petrography, mineral geochemistry,and metamorphic P-T conditions for the altered amphibolites in the Wumaqing Formation was carried out, and the relationship between metamorphism and uranium mineralization in this area was discussed. The results showed that the metamorphic rocks in the Haita area had experienced one stage of metamorphism and two stages of late fluid alteration. The P-T conditions in the metamorphic stage of the peak period were 523~608℃/0.18~0.40 GPa,and the temperature in the latter two stages of fluid alteration was264~334℃. The early uranium mineralization age in the Haita area is similar to the metamorphicmigmatization age in the area.The temperature and pressure conditions in the peak metamorphic stage and the temperature conditions in the later fluid alteration stage were uniform with the fluid inclusions of the migmatite-type uranium deposits. The two major metallogenic stages divided by temperature were basically the same. It reflects that the migmatite-type uranium deposits in the Haita area have experienced two major stages:metamorphism and migmatization mineralization and later hydrothermal superimposed transformation mineralization.
作者
陈友良
顾孟娟
欧何琼
付于真
王凤岗
张宝玲
CHEN Youliang;GU Mengjuan;OU Heqiong;FU Yuzhen;WANG Fenggang;ZHANG Baoling(College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)
出处
《铀矿地质》
CAS
CSCD
2023年第1期16-28,共13页
Uranium Geology
基金
国家自然科学基金项目“康滇地轴中南段新元古代钠长岩型铀矿成矿机理研究”(编号:42072096)
中国核工业地质局重点科研项目“康滇地轴铀成矿环境及选区研究”(编号:202137-3)
成都理工大学珠峰科技计划(编号:2021ZF11413)联合资助。
关键词
五马箐组
变质作用
温压条件
成矿意义
海塔地区
Wumaqing Formation
metamorphism
temperature and pressure conditions
metallogenic significance
Haita area
