摘要
江西西北部董坑及其附近的铀矿床产于震旦系上统陡山沱组的Z_3^(1-4)层和灯影组的Z_3^(2-2)层细晶白云岩内。铀矿化与咸化水白云石化蚀变有关,并与方解石脉共生。作者以该区的系统岩矿资料、热分析曲线、包裹体测温、稳定同位素、硅酸盐分析以及水化学数据解释了董坑矿床的聚铀要素、成矿条件和矿床成因问题。
Lots of copper, lead, zinc and rare element deposits occur in dolomite or dolomitic rocks. Uranium deposits related to dolomite occupy an important place in southern China, and the host rock is dolomite of semi-closed neritic facies.Uranium content of the host rock ranges from 6-36 ppm, much higher than the average uranium content of dolomite. The hot climate and repeated fracturing in Tertiary were favorable for the oxidation and migration of uranium in Sinian strata. Due to the geothermal gradient, the uranium-bearing solution was heated and, as a result, uranium ore was precipitated along the interformational fracture zones of dolomite.Based on data obtained in such aspects as strata, minerals, rocks, thermal analysis, chemical analysis, inclusion thermometry, cathodolummescence and sulfur carbon and oxygen isotopes, it is concluded that the ore deposit is of sedimentary-thermal infiltration type.
出处
《矿床地质》
CAS
CSCD
北大核心
1990年第1期70-76,共7页
Mineral Deposits
