江西相山沙洲铀矿床He、Ar同位素特征及其地质意义  

Helium—Argon Isotopic Characters and Geological Significance of the Shazhou Uranium Deposit,Xiangshan Orefield,Jiangxi Province

作　　者：严冰[1] 严寒 魏文风[1] 曹阳 李健[1] 

机构地区：[1]成都理工大学,成都610059 [2]核工业西藏地质调查院,成都610081 [3]有色金属华东地质勘查局,南京210007

出　　处：《地质论评》2014年第3期624-634,共11页Geological Review

基　　金：国家重点基础研究发展计划(即973计划)(编号2007CB411400)的成果

摘　　要：江西相山沙洲铀矿床位于中国华南赣杭铀成矿带南西段、华南中生代陆相火山岩带西缘。本次工作系统采集了矿区内成矿期黄铁矿、方解石,开展了稳定同位素和稀有气体同位素研究。研究表明方解石的δ13CV-PDB和δ18OV-SMOW值分别为-3.2‰^-7.4‰,8.5‰~15.2‰,成矿流体中的碳主要源自地幔;黄铁矿样品流体包裹体的n(40Ar)/n(36Ar)值为303~326,n(3He)/n(4He)值为0.193~2.946 Ra;成矿流体的He—Ar同位素组成是地壳流体[n(3He)/n(4He)值较低,n(40Ar)/n(36Ar)值与大气近似]和地幔流体[高n(3He)/n(4He)和n(40Ar)/n(36Ar)值]两端元的不同比例混合产物。bThe Shazhou uranium deposit in Xiangshan of Gan-Hang uranium metallogenie belt in Southern China, orefield, Jiangxi Province,is located in the south-west in the west of Southern China vocalnic belt of terrestrial facies. We have systematically collected pyrites and calcite formed at mineralization epoch, then took isotopic tests. The results show that the 813 CV.PDB and818 Ov-SMoW of calcites is - 3.2‰ - - 7.4‰,8.5‰ - 15.2‰, and it in ore- forming fluids was mainly derived from the Mantle. the n（40Ar）/n（36Ar） of fluid inclusions in pyrites is 303 ～ 326, the n（3He）/n（4He） is 0. 193 ～2. 946 Ra, which is resulted from that Crust-derived fluids mixed with Mantle-derived fluids at different ratios.

关 键 词：铀 HE AR 壳幔混合 

分 类 号：P619.14[天文地球—矿床学]