Calcite Sm-Nd Isochron Age and Its Geological Significance of the 6722 Uranium Ore Deposit, Southern Jiangxi Province, China
详细信息
- 责任者：Chen Heng (State Key Laboratory of Ore Deposit Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Hu Ruizhong
- 刊名：Acta Mineralogica Sinica
- 出版年：2012
- 卷期：32(1)
- 关键词：铀矿 ; uranium ores ; 钐—钕计时 ; Sm-Nd dating ; 江西 ; Jiangxi Province
- 页码：p.52-59
- 图表：5 illus., 2 tables, 49 refs.
- 分类号：1001
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
The 6722 vein-type Uranium Deposit, the largest deposit in Hecaokeng uranium ore fields, lies in the intersection of EW-trending Nanling Mountains and NE-trending Wuyi uplift.In this study, eight samples of syngenic calcite from granite-type ore body were collected for Sm-Nd isochron age dating, and the result was (113.4±6.9) Ma. Early-stage mineralization happening in 113 Ma preceded main-stage mineralization in felsic cryptoexplosive breccia. It is inferred that early-stage mineralization (113 Ma) created preconcentration of uranium for the formation of later higher-grade ore in cryptoexplosive breccia.