陕西勉—略—阳地区陈家坝铜铅锌多金属矿床白云岩地球化学特征及其成因研究  

Geochemical characteristics and genesis of dolomite at Chenjiaba Cu-Pb-Zn polymetallic deposit in Mian-Lue-Yang area,Shaanxi

作　　者：丁坤 王瑞廷 刘凯 张天运 DING Kun;WANG Ruiting;LIU Kai;ZHANG Tianyun(Shaanxi Railway Institute,Weinan 714000,Shaanxi,China;Chang'an University,Xi'an 710054,Shaanxi,China;Northwest Nonferrous Geology and Mining Group Co.,Ltd.,Xi'an 710054,Shaanxi,China;Shangluo Northwest Nonferrous Geological Party No.713 Co.,Ltd.,Shangluo 726000,Shaanxi,China;Hanzhong Northwest Nonferrous Geological Party No.711 Co.,Ltd.,Hanzhong 723000,Shaanxi,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]长安大学,陕西西安710054 [3]西北有色地质矿业集团有限公司,陕西西安710054 [4]商洛西北有色七一三总队有限公司,陕西商洛726000 [5]汉中西北有色七一一总队有限公司,陕西汉中723000

出　　处：《矿产与地质》2025年第1期118-123,共6页Mineral Resources and Geology

基　　金：中国地质调查局项目(编号:1212011220869);陕西铁路工程职业技术学院科技创新团队项目(编号:KJTD202001)共同资助。

摘　　要：白云岩是陕西省勉—略—阳地区陈家坝铜铅锌多金属矿床的主要赋矿围岩。为了探讨其成岩环境及岩石成因,对矿床中的白云岩进行稀土元素、微量元素及C、O同位素分析研究。结果显示,白云岩REE、Nb、Th和Zr等元素的含量,与沉积碳酸盐岩接近;结合岩石的Eu正异常、Ce负异常及U含量(4.07~10.3)×10^(-6)和U/Th比值(1.66~2.08),可知该区白云岩形成于较强的还原环境,沉积时受海底热液活动的影响。此外,白云岩δ^(13)C值在-0.93‰~1.44‰,平均值为0.35‰,δ^(18)O值在-16.22‰~-3.27‰,平均值-8.51‰,认为其形成于海相环境并具有较高的成岩温度。Dolomite is the main ore-hosted surrounding rock at Chenjiaba Cu-Pb-Zn polymetallic deposit in Mian-Lue-Yang area,Shaanxi province.In order to discuss the diagenetic environment and petrogenesis of dolomite,the dolomite in the deposit is analyzed for the rare earth elements,trace elements,and C and O isotopes.The result shows that the contents of REE,Nb,Th and Zr are similar to those of sedimentary carbonate rocks.According to Eu positive anomaly,Ce negative anomaly and U content(4.07×10^(-6)~10.3×10^(-6))and U/Th value(1.66×10^(-6)~2.08)of the rock,it is found that it is formed in a strong reduction environment,and the dolomite deposition in this area is affected by submarine hydrothermal activity.In addition,theδ^(13)C values of dolomite are from-0.93‰to 1.44‰,with an average value of 0.35‰,and theδ^(18)O values range from-16.22‰to-3.27‰,with an average value of-8.51‰.It is considered that dolomite is formed in the marine saline water environment with high diagenetic temperature.

关 键 词：陈家坝矿床 白云岩 地球化学特征 成因模式 勉—略—阳地区 

分 类 号：P618.4[天文地球—矿床学] P581[天文地球—地质学]