衢州市上方镇方解石矿床碳、氧同位素地球化学特征  

Carbon and Oxygen Isotopic Composition of the Shangfang Calcite Deposit in Quzhou City, Zhejiang Province

作　　者：刘成东[1,2] 刘友 万建军[1,2] 谭双[1,4] 赵严 张辉 梁良 肖俊[1,2] 张书嘉[1,2] LIU Cheng-dong;LIU You;WAN Jian-jun;TAN Shuang;ZHAO Yan;ZHANG Hui;LIANG Liang;XIAO Jun;ZHANG Shu-jia(Stale Key Laboratory of Nuclear Resources and Environment, East China University of Technology , Nanchang 330013 , China;College of Earth Sciences, East China University of Technology, Nanchang 330013 , China;Qujiang District Bureau of Quzhou Land and Resources of Zhejiang Province, Quzhou Zhejiang 324000, China;Changsha Uranium Geology Research Institute, CNNC, Changsha 410007 , China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]东华理工大学地球科学学院,南昌330013 [3]浙江省衢州市衢江区国土资源局衢江分局,浙江衢州324000 [4]核工业二三○研究所,长沙410007

出　　处：《矿物岩石地球化学通报》2019年第2期374-378,394,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41762016);企事业单位委托科技项目(ZR2017000014);东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金(RGET1804)

摘　　要：为研究浙江省衢州市上方镇方解石矿床的成岩成矿环境,采集了上方镇方解石矿床中的大理岩样品,用MAT-253型气体同位素质谱仪对其进行了碳、氧同位素分析测试。结果表明,样品的δ^(13)C_(PDB)和δ^(18)O_(SMOW)均值分别为-1.32‰和18.25‰,计算的盐度指数Z值为97.42～130.08,均值为118.50,在δ^(18)O_(SMOW)-δ^(13)C_(PDB)图解上大多数样品点落于海相碳酸盐与碳酸盐溶解作用范围内,上方镇方解石矿床大理岩的原岩应为沉积成因,可能形成于宽阔的海洋环境。In order to investigate the petrogenetic and metallogenic environments of the Shangfang deposit in the Qujiang District, Quzhou City, systematic studies of carbon and oxygen isotopes of calcites from this deposit have been carried out. 48 samples were measured by Thermo MAT-253 gas isotope ratio mass spectrometer. The results show that the average values of δ13CPDB and δ18OSMOW are-1.32‰ and 18.25‰, respectively. Calculated salinity indexes(Z) based on the δ13C and δ18O values range from 97.42 to 130.08(average=118.50). In the δ18OSMOW-δ13CPDB diagram, carbon-oxygen isotopic compositions of most samples plot in the area of marine carbonates and the carbonate dissolution. Integrated studies indicate that the protolith of marbles in the Shangfang deposit is likely to be sedimentary carbonate rocks, and the Shangfang calcite deposit might be formed in a marine environment.

关 键 词：方解石矿床 大理岩 碳氧同位素 地球化学特征 

分 类 号：P597.2[天文地球—地球化学]