摘要
文章以康滇地轴典型热液型铀矿——大田铀矿床为研究对象,开展了围岩、构造蚀变带脉岩中的锆石和矿石晶质铀矿U-Pb法定年,以及年代学特征研究,获得如下认识:1)大田地区混合岩的原岩形成于晚元古代早期之前(>900Ma);2)混合岩化作用发生于840~900Ma;3)铀矿区F3碱性构造蚀变岩带形成于混合岩化晚期(820~840Ma);4)大田铀矿床的成矿年龄为777Ma左右。因此笔者认为,康滇地轴的形成与发展、包括铀在内的成矿作用,是与罗迪尼亚大陆的形成及裂解演化所导致的构造岩浆作用密切相关。大田地区的构造演化对铀成矿具有重要的意义。
The chronology characteristics of Kangdian typical hydrothermal uranium ore （Datian uranium deposits ） were studied by dating the U- Pb age of zircon and uraninite in the surrounding rock, dike in structure belt. Through careful dating, recognition was conclude in the follows： 1） the original rock of migmatite in Datian area was formed before middle-late proterozoic （earlier than 900 Ma） ; 2） the mig- matization was formed in 840-900 Ma; 3） the alkaline alteration belt （ F3 tectonic belt） in Datian ura- nium ore area was formed in the late migmatization which was formed in the age of 820-840 Ma; 4） Datian uranium mineralization epoch is about 777 Ma. Formation, development of Kangdian geo-axis and uranium mineralization has close relationship with the formation and evolution oI Rodinia continental and tectonic magmatic thermal event caused by its cracking. The tectonic evolution of Datian region has im- portant significance on uranium mineralization.
作者
徐争启
张成江
欧阳鑫东
姚建
孙康
尹明辉
XU Zhengqi ZHANG Chengjiang OUYANG Xindong YAO Jian SUN Kang YIN Minghui(College of Geoscience, Chengdu University of Technology, Chengdu, Sichuan 610059, China Research Institute No. 280, CNNC, Guanghan, Sichuan 618300, China)
出处
《铀矿地质》
CAS
CSCD
2017年第5期280-287,共8页
Uranium Geology
基金
中国核工业地质局重点科研项目"西南三江地区花岗岩铀成矿条件分析"和"康滇地轴中南段混合岩中特富铀矿成矿机制研究"(编号:201637
201638)资助
