地球学报2025，Vol.46Issue(2)：343-360,18.DOI:10.3975/cagsb.2024.061901
大兴安岭南段锡多金属矿床成矿岩体全岩地球化学、锆石U-Pb年龄、Hf同位素特征及其地质意义
摘要
Abstract
The southern Great Xing'an Range is the most important tin-polymetallic mineralization zone in Northern China,highlighted by the Bianjiadayuan,Baogaigou,and Maodeng deposits.These deposits are closely spatially associated with the Yanshanian granitic intrusions.Precision zircon U-Pb isotopic dating of ore-bearing intrusions revealed emplacement ages of(136.9±0.8)Ma,(143.6±0.8)Ma,and(135.0±1.4)Ma for the Bianjiadayuan quartz porphyry,the Baogaigou granite,and the Maodeng granitic porphyry,respectively.According to detailed major element analyses,these granitic intrusions were classified as metaluminous to weak peraluminous,high-K calc-alkaline granites.Trace element studies showed an enrichment in LILE and a depletion in HFSE of these intrusions,with pronounced negative Eu anomalies.We classified these granites as highly differentiated I-type granites,based on their whole-rock geochemical characteristics and Zr saturation temperature(753-796 ℃).Zircon Hf isotope analysis(εHf(t)=-0.86-13.7,TDM2=307-1 240 Ma)indicated that these granitic predominantly originated from partial melting of Neoproterozoic juvenile lower crust.Geochemical and geochronological studies suggested that Early Cretaceous highly differentiated I-type granites in the southern Great Xing'an Range showed significant potential for tin exploration.关键词
大兴安岭南段/锡矿/高分异花岗岩/早白垩世Key words
southern Great Xing'an Range/tin deposits/highly fractionated granite/Early Cretaceous分类
地质学引用本文复制引用
张雪旎,张宇飞,彭蓉,杨颖,曾庆栋..大兴安岭南段锡多金属矿床成矿岩体全岩地球化学、锆石U-Pb年龄、Hf同位素特征及其地质意义[J].地球学报,2025,46(2):343-360,18.基金项目
本文由国家科技重大专项项目(编号:2024ZD1001507)、国家自然科学基金青年基金项目(编号:41672095)和国家自然科学基金重点项目(编号:92062218)联合资助. This study was supported by National Science and Technology Major Project(No.2024ZD1001507),and National Natural Science Foundation of China(Nos.41672095 and 92062218). （编号:2024ZD1001507）
