Rb-Sr isochron ages and significance of bimodal volcanic association in Baimianshi uranium ore-field, South China  

作　　者：CHEN Peirong~1, WANG Yinxi~2, NI Qisheng~1, KONG Xinggong~2 and ZHANG Bangtong~2 1. State Key Laboratory of Mineral Deposits, Department of Earth Sciences, Nanjing University, Nanjing 210093, China 2. Center of Modern Analysis, Nanjing University, Nanjing 210093, China 

出　　处：《Chinese Science Bulletin》1999年第S2期3-4,共2页

摘　　要：1 Geologic background THE volcanic U-deposits are generally associated with felsic to intermediate volcanic rock and their sedimentary derivatives. However, uranium mineralization has been found to be spatially associated with thebasalt of bimodal volcanic associations in Baimianshi uranium ore field. Baimianshi uranium ore-field islocated in Baimianshi volcanic-sedimentary basin of south Jiangxi Province. The cover rocks of the basinconsist of a suite of bimodal volcanic-sedimentary sequences. Its basement rocks are two-mica granites ofBaimianshi rock body. The basalt of cover rocks is interbedded with arkoses in lower sequence, and rhyolite or rhyolitic tuff in upper sequence. Uranium minerals mainly occur as disseminations in the

关 键 词：RB-SR ISOCHRON AGES BIMODAL VOLCANIC rocks uranium ore-field south China. 

分 类 号：P597.3[天文地球—地球化学]