赣闽长英质隐爆角砾岩和基底围岩水-岩作用的实验研究及其地质意义  

Experiment On Water Rock Interaction Between Felsic Cryptoexplosive Breccia and Basement Rock and Its Geological Significance In Jiangxi And Fujian Provinces

作　　者：章邦桐[1] 陈培荣[1] 倪琦生[1] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室

出　　处：《华东地质学院学报》1998年第3期201-205,共5页Journal of East China Geological Institute

基　　金：国家自然科学基金

摘　　要：对闽北５７０铀矿床，赣南６７２２铀矿床，赣东北银山多金属矿床的长英质隐爆角砾岩及其基底岩石，用ｐＨ＝１．９，含ΣＳ＝３．２×１０－４，Σｄ＝３．５×１０－４，ΣＦ＝３×１０－５的水溶液，在９０℃条件下进行水－岩作用实验，研究岩石中活动性Ｕ，Ｔｈ，Ｐｂ，Ｚｎ等元素的地球化学行为。实验结果证实：岩石中铀、锌、铅具有较强的活化迁移能力；交代蚀变作用对铀活化和成矿富集有特殊重要意义；长英质隐爆角砾岩不是所研究矿床矿物质的主要来源；基底围岩对成矿有重要贡献。For the sake of study geochemical behavior of active U, Th,Pb,Zn elements in rocks, an experiment on water rock interaction between felsic cryptoexplosive breccia and basement rock from uranium deposit No.570 in north Fujian, uranium deposit No.6722 in south Jiangxi, Yinshan polymetallec deposit in Jiangxi is conducted with the solution conditions of pH=1.9,ΣS=3.2×10 -4 ,ΣCl=3.5×10 -4 ,ΣF=3×10 -5 ,t=90 ℃. The experiment result shows that U,Zn,Pb elements in rocks have stronger activation migration power, metasomatic alteration has important significance for the migration and enrichment of U, main ore formation material is not derived from felsic cryptoplosive breccia, and the basement rocks play an important role in ore formation.

关 键 词：长英质 隐爆角砾岩 水岩作用 铀矿床 多金属矿床 

分 类 号：P619.140.5[天文地球—矿床学] P617.9[天文地球—地质学]