江西上饶蔡家坪铅锌矿床地质特征和成矿岩体SHRIMP锆石U-Pb定年  

Geological characteristics and SHRIMP zircon U-Pb dating of Caijiaping Pb-Zn deposit in Shangrao,Jiangxi

作　　者：黄安杰[1] 李康东 温祖高 HUANG Anjie;LI Kangdong;WEN Zugao(Northeast Geological Party of Jiangxi Bureau of Geology and Mineral Resources Exploration,Shangrao 334000,China)

机构地区：[1]江西省地质矿产勘查开发局赣东北地质大队,江西上饶334000

出　　处：《桂林理工大学学报》2023年第2期176-183,共8页Journal of Guilin University of Technology

基　　金：江西省地质矿产勘查开发局地勘项目(赣地矿字〔2005〕41号)。

摘　　要：蔡家坪铅锌矿床是近年来在北武夷成矿带内铜钹山中生代陆相火山盆地中新发现的铅锌矿床。在野外地质调查的基础上,通过钻孔揭露和岩矿鉴定等方法对蔡家坪铅锌矿床的地质特征进行分析,并对成矿流纹斑岩进行同位素定年。蔡家坪铅锌矿矿化类型可分为次火山岩型和层间破碎带型,矿床成因均与流纹斑岩关系密切;流纹斑岩SHRIMP锆石U-Pb定年显示其^(206)Pb/^(238)U与^(207)Pb/^(235)U的谐和曲线年龄为133±3 Ma,而^(206)Pb/^(238)U加权平均年龄为133.3±2.7 Ma,表明成岩时代为早白垩世,属于燕山中晚期。综合区域地质分析认为,该矿床的成岩成矿时代、成矿条件等与冷水坑铅锌银矿相似,找矿潜力较大。Caijiaping Pb-Zn deposit in Shangrao of Jiangxi province,is the latest discovered Pb-Zn deposit in Tongboshan Mesozoic continental volcanic basin in the northern Wuyishan metallogenic belt in recent years.Based on field geological survey,the geological characteristics of Caijiaping Pb-Zn deposit are analyzed by means of borehole exposure,rock-ore identification and U-Pb isotopic dating of ore-forming rhyolite porphyry.The results show that the deposit can be divided into subvolcanic type and interlayer fracture belt type,and the genesis of the deposit is closely related to the rhyolite porphyry.The SHRIMP zircon U-Pb age of ore-forming rhyolite porphyry body is 133±3 Ma,the diagenesis and mineralization age of rhyolite porphyry is Early Cretaceous.Comprehensive analysis of regional geology shows that the ore deposit is similar to Lengshuikeng Pb-Zn-Ag polymetallic deposit in terms of its age of rock formation and metallogenic conditions,and has a high potential for prospecting.

关 键 词：铅锌矿 地质特征 SHRIMP锆石U-PB定年 上饶 江西 

分 类 号：P588.141[天文地球—岩石学] P597.3[天文地球—地质学]