江西相山火山岩型铀矿C、O、H、S同位素特征及意义  

ISOTOPIC CHARACTERISTICS OF C,O,H AND S IN XIANGSHAN URANIUM OREFIELD,JIANGXI PROVINCE

作　　者：严冰[1] 严寒[2] 周莉[1] 王腾[1] 许国明[3] 曹阳 

机构地区：[1]成都理工大学,四川成都610059 [2]四川省核工业地质局西藏地调院,四川成都610081 [3]四川省地质矿产勘查开发局402地质队,四川成都610213 [4]有色金属华东地质勘查局,江苏南京210007

出　　处：《矿物岩石》2013年第3期47-53,共7页Mineralogy and Petrology

基　　金：国家重点基础研究发展计划或973计划(2007CB411400);成都理工大学矿物;岩石;矿床重点学科建设项目;成都理工大查与勘探重点学科建设项目

摘　　要：通过测定相山铀矿成矿期方解石的δ13 CPDB和δ18 OSMOW值,分别为-3.2‰～-7.4‰,1.7‰～15.2‰,表明成矿流体中矿化剂CO2主要来源于地幔去气,且δ13 CPDB与δ18 OSMOW呈负相关关系,暗示CO2去气作用或流体与围岩间的水-岩反应可能是导致方解石沉淀的主要机制。萤石的流体包裹体中水的δ18 O值为-1.4‰～-9.0‰,δD值为-68‰～-90‰;石英的δ18 O值为2.4‰～4.4‰,δD值为-59‰～-71‰,属大气降水成因流体,成矿过程中发生的水-岩相互作用对流体氢氧同位素组成特征具有重要影响;S2-作为还原剂对铀沉淀也起了很大的作用;黄铁矿的δ34S为+9.6‰～+19.55‰,成矿流体中的硫可能主要来自围岩。Stable isotope compositions of different stages of uranium minerals in the Xiangshan uranium ore field are analyzed. The δ13CPDB and δTMOSMOw values of the calcite are in the range of 3.2N‰-7.4‰ and 1.7‰-15.2‰ respectively. It indicates that mineralizer CO2 mainly originated from earth mantle. The negative correlation between δ3 CPDB and δ18 OSMOW Of CO2 degassing, mix- ing of two fluids and fluid-rock interaction may be a major controlling factor for calcite precipitati- on. δ18O of water in fluid inclusions of fluorites is --1.4‰--9.0‰, and 8D is --68‰--90‰） δ18O of quartz is 2.4‰-4.4‰, and δD is --59‰--71‰, indicating that the fluids are meteoric in origin, and extensive water-rock reaction played an important role in the mineralization. S2- which as a reduction agent also played an important ment of S isotope in pyrite suggests that the most of role for uranium precipitation）the measure- part of sulfur in ore-forming fluid may main-ly came from surrounding rocks.

关 键 词：相山 稳定同位素 C H O S同位素 

分 类 号：P597.2[天文地球—地球化学]