西北地质2024，Vol.57Issue(2)：90-106,17.DOI:10.12401/j.nwg.2024009
内蒙古下陶勒盖铁铜矿床成矿岩体地球化学特征及其成岩成矿启示
Geochemical Characteristics of Ore-forming Intrusions and their Diagenetic and Metallogenic Revelation from the Xiataolegai Iron and Copper Deposit,Inner Mongolia
摘要
Abstract
The Xiataolegai iron and copper deposit,located in Inner Mongolia,is a representative skarn-type deposit within the active continental margin of the Beishan Metallogenic Belt.Situated in the western part of the Ejina Banner in the Alashan League,it is closely associated in both time and space with granodiorite and monzo-granite linked to Fe-Cu mineralization.To ascertain the formation age,source characteristics,and the relation-ship between magmatism and mineralization,samples underwent petrography,geochemical analysis,and zircon U-Pb dating.Results reveal high SiO2,Al2O3,alkalinity,and low MgO,with LREE enrichment and HREE deple-tion in both granodiorite and monzogranite.Granodiorite exhibits Rb,La enrichment,Ta,Nb,Ti,P depletion,weak Ce positive and Eu negative anomaly,while monzogranite shows Rb,U enrichment,Nb,Ti,P depletion,Ce positive and weak Eu negative anomaly Both granodiorite and monzogranite are classified as calc-alkaline I-type granite.The obtained U-Pb ages for zircons from granodiorite and monzogranite are(451.7±4.8)Ma and(460.1±4.9)Ma,indicating that the magmatism and related mineralization in the eastern and western section of the deposit occurred in the Late Ordovician and Middle Ordovician,respectively.A comprehensive analysis sug-gests that the Xiataolegai deposit formed in the late-middle Ordovician within an active continental margin arc tectonic setting,likely associated with oceanic plate subduction.关键词
下陶勒盖铁铜矿床/花岗闪长岩/二长花岗岩/岩石地球化学/锆石U-Pb定年Key words
Xiataolegai iron and copper deposit/granodiorite/monzogranite/petrogeochemistry/zircon U-Pb dating分类
天文与地球科学引用本文复制引用
宋彦博,杨永亮,王继春,袁硕浦,王建平,翟德高,柳振江,许展,王东星,邱广东..内蒙古下陶勒盖铁铜矿床成矿岩体地球化学特征及其成岩成矿启示[J].西北地质,2024,57(2):90-106,17.基金项目
内蒙古自治区自然资源厅项目"内蒙古北山成矿带黑鹰山-石板井地区铁铜钼多金属成矿系统研究与找矿预测"(2022-TZH03)资助. （2022-TZH03）
