豫西黄水庵地区碳酸岩中方解石Sr-Nd-Pb同位素特征及其地质意义  

Sr-Nd-Pb isotopic characteristics of calcite in the Huangshui’’an carbonatite,western Henan Province and its geological significance

作　　者：李肖龙 申硕果 李山坡 吕国营 茹朋 郭强 LI Xiaolong;SHEN Shuoguo;LI Shanpo;LYU Guoying;RU Peng;GUO Qiang(Henan Academy of Geology,Zhengzhou 450016,Henan,China;Henan Key Laboratory of Metallogenic Geological Processes and Resource Utilization,Zhengzhou 450016,Henan,China;Key Laboratory of Deep Ore-prospecting Technology Research for Non-ferrous Metals of Henan Province,Zhengzhou 450016,Henan,China;The Prevention and Control Center for the Geological Disaster of Henan Geological Bureau,Zhengzhou 450012,Henan,China;Lang Fang Natural Resources Comprehensive Survey Center,China Geo-logical Survey,TianJin 300301,China)

机构地区：[1]河南省地质研究院,河南郑州450016 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450016 [3]河南省有色金属深部找矿勘查技术研究重点实验室,河南郑州450016 [4]河南省地质局地质灾害防治中心,河南郑州450012 [5]中国地质调查局廊坊自然资源综合调查中心,天津300301

出　　处：《矿产勘查》2025年第1期34-43,共10页Mineral Exploration

基　　金：河南省地质研究院2023;2024年度地质科技攻关项目(2023-331-XM023-KT01、2024-903-XM08);河南省自然资源厅自然资源科研项目(2023-382-14)联合资助。

摘　　要：黄水庵地区处于华北克拉通南缘,在该地区沿北西向的木头沟—黄水庵背斜的轴部发育碳酸岩脉。本文在详细的矿物学、岩石学研究基础上,研究了黄水庵地区碳酸岩中方解石Sr-Nd-Pb同位素组成。结果表明,黄水庵碳酸岩中方解石的^(87)Sr/^(86)Sr为0.705749~0.706085,平均为0.705894;^(143)Nd/^(144)Nd为0.511619~0.512076,平均为0.511801;^(208)Pb/^(204)Pb为36.351~37.534,平均为37.443;^(207)Pb/^(204)Pb为15.413~15.471,平均为15.443;^(206)Pb/^(204)Pb为17.228~17.319,平均为17.258;μ值(^(238)U/^(204)Pb)为9.25~9.37,平均为9.31。方解石SrNd-Pb同位素组成表明,黄水庵碳酸岩可能来源于富集地幔EMI,在岩浆侵入过程中,可能有少量的壳源物质混染。综合分析该地区发育的稀土和铀地球化学异常,以及秦岭造山带已发现多处印支期形成的矿床,认为黄水庵地区具有寻找与碳酸岩相关矿产的潜力。The Huangshui’an region is situated in the southern margin of the North China Craton.In this area,carbonate veins are developed along the axis of the northwest-trending Mutougou-Huangshui’an anticline.This pa⁃per presents a comprehensive study of the Sr-Nd-Pb isotopic composition of calcite in the carbonate rocks of the Huangshui’an area,building upon detailed mineralogical and petrological investigations.The results indicate that the^(87)Sr/^(86)Sr ratios of calcite range from 0.705749 to 0.706085,with an average of 0.705894.The^(143)Nd/^(144)Nd ratios range from 0.511619 to 0.512076,with an average of 0.511801.The^(208)Pb/^(204)Pb ratios vary from 36.351 to 37.534,averaging at 37.443.Similarly,the^(207)Pb/^(204)Pb ratios range from 15.413 to 15.471,averaging at 15.443.The^(206)Pb/^(204)Pb ratios span from 17.228 to 17.319,with an average of 17.258.Theμvalues(^(238)U/^(204)Pb)range from 9.25 to 9.37,averaging at 9.31.The Sr-Nd-Pb isotopic composition of calcite suggests that the Huangshui’an carbonates likely originated from an enriched mantle source known as EMI,with potential minor contamination from crustal ma⁃terials during the magma intrusion process.Considering the rare earth and uranium geochemical anomalies in the re⁃gion,along with the presence of Indosinian deposits in the Qinling Orogen,it is evident that the Huangshui’an area holds significant potential for the exploration of minerals associated with carbonate formations.

关 键 词：碳酸岩 SR-ND-PB 富集地幔 地球化学 黄水庵 

分 类 号：P597[天文地球—地球化学]