下庄矿田气热高温铀成矿特征及年龄研究  

STUDY OF PNEUMATO HYDROTHERMAL HIGH TEMPERATURE URANIUM METALLOGENIC CHARACTERISTICS AND URANIUM METALLOGENIC AGES IN XIAZHUANG URANIUM ORE FIELD

作　　者：徐达忠[1] 刘林清[1] 胡宝群[1] 

机构地区：[1]华东地质学院

出　　处：《铀矿地质》1999年第5期266-270,278,共6页Uranium Geology

基　　金：核工业科学基金;核能资源开放实验室资助项目

摘　　要：本文报道了在下庄矿田花岗岩体接触带附近的剪切构造糜棱岩带中，存在受深色蚀变岩制约的气热高温型铀成矿，它是下庄矿田发生于晚侏罗世的一次重要铀成矿作用。文中指出了韧性剪切带及气热交代蚀变岩是铀成矿的共同控制因素，同时划分了４种气热高温矿石组合类型，对各组合电子探针分析的化学成分作了较详细介绍。文章还披露了作者所测的３个矿石晶质铀矿Ｕ－Ｐｂ同位素年龄（为１６５—１４６Ｍａ），表明属晚侏罗世成矿。此外，对以往所划分的成矿期次提出了修改的商榷意见。This paper reports that there is pneumato hydrothermal high temperature uranium mineralization controlled by dark color altered rock in mylonite shear zone in the vicinity of the granite contact zone of Xiazhuang uranium ore field.It is an important uranium metallogenic event which occurred in Late Jurassic period in Xiazhuang uranium ore field.The authors also propose that the shear zone and pneumato hydrothermally metasomatic altered rock are common controlling factors of uranium metallogenesis.In addition,four types of pneumato hydrothermal high temperature ore assemblages are distinguished,and chemical composition of each assemblage obtained by electron probe analysis is introduced in detail.It is revealed that three uranium samples have the U Pb isotope ages of 165-146 Ma indicating the Late Jurassic period of mineralization.Finally,the paper makes a modification in the previous division of metallogenic stages.

关 键 词：气热高温型铀矿 晶质铀矿 矿床成矿 年龄 铀矿床 

分 类 号：P619.140.5[天文地球—矿床学] P619.140.2[天文地球—地质学]