摘要
陈家庄铀矿床铀单矿物U-Pb及黑云母K-Ar、全岩Rb-Sr同位素定年结果,成矿时期为423—382Ma,主成矿年龄406Ma,矿床形成至今仍保持半封闭系统,未遭受明显后期改造。本区早古生代时期发生的区域动力热流变质作用的年龄为457Ma,热液活动的上限为378Ma,冷却年龄为373—350Ma,伟晶状花岗岩原岩丰龄452Ma。并提出了本区主要地质事件时序及演化模式。
The monomineralic uranium U-Pb, biotite K-Ar, whole rock Rb-Sr isotope dating results show that the minerogenetic age is 423—382 Ma, the major age is 406 Ma from uranium deposit in Chenjiazhuang. The ore deposit is still in semic-elosed system since its origin without epigenetic reformation, In addition, the regional metamorphism caused by kinetic heat flow is dated as 457 Ma; the upper hydrothermal limit of this area is calculated as 378 Ma, cooling age is of 373—350 Ma; source rock of giant granite is of 425 Ma. Besides, a sequence of major geologic events and evolution model of this area is presented.
出处
《矿物岩石》
CAS
CSCD
1991年第1期73-79,共7页
Mineralogy and Petrology
关键词
铀矿
矿床
同位素
地质年代
isotope geochron, chenjiazhuang uranium deposit, giant granite, magma, hydrothermal activity
