地质论评2025，Vol.71Issue(3)：997-1010,14.DOI:10.16509/j.georeview.2024.10.075
大兴安岭南段浩布高多金属矿集区LA-MC-ICP-MS锡石U-Pb定年及其意义
LA-MC-ICP-MS cassiterite U-Pb dating and implications in Haobugao skarn polymetallic district,southern Great Hinggan Mountains
摘要
Abstract
Objectives:The Haobugao polymetallic district in Inner Mongolia is located within the Huanggangliang—Ganzhuermiao metallogenic belt of the southern Great Hinggan Mountains.Skarn Zn—polymetallic,porphyry Mo,and granite-hosted Sn mineralization occurred during the Mesozoic magmatic intrusion.However,the relationship of the granite-hosted Sn mineralization with skarn Zn—polymetallic and porphyry Mo mineralization remain obscure,and are poorly understood. Methods:In this paper,based on detailed field geological work,granite-hosted Sn ores in the Wulanba pluton are investigated as an ideal objective.Two cassiterite samples were collected to date the U-Pb ages via LA-MC-ICP-MS method. Results:They yielded U-Pb Tera-Wasserburg lower intercept ages of 148.7±5.1 Ma and 146.4±3.4 Ma,respectively.The data suggests that granite-hosted Sn mineralization at Haobugao is coeval with the emplacement of the alkaline granite in the middle part of the Wulanba pluton(148.9～142.0 Ma),and thus indicating a consistency in space and time. Conclusions:Combined with previous studies,we propose that granite-hosted Sn mineralization can be spatially,temporally and genetically related with skarn Zn—polymetallic and porphyry Mo mineralization at Haobugao,and formed by the Late Jurassic—Early Cretaceous magmatism and related mineralization.In addition,the timing of Sn mineralization at Haobugao(148.7～139.6 Ma)coincides with that of large-scale Sn—polymetallic metallogeny in the southern Great Hinggan Mountains(150～130 Ma).We thus propose that,in combination with regional tectonic evolution,the Haobugao Sn—polymetallic district formed in an extensional tectonic setting.关键词
浩布高矿集区/锡石U-Pb定年/LA-MC-ICP-MS/大兴安岭南段Key words
Haobugao/cassiterite U-Pb dating/LA-MC-ICP-MS/southern Great Hinggan Mountains引用本文复制引用
赵伟策,陈佳德,魏良民,李伟,秦季军,柳爱新,刘孜..大兴安岭南段浩布高多金属矿集区LA-MC-ICP-MS锡石U-Pb定年及其意义[J].地质论评,2025,71(3):997-1010,14.基金项目
本文为赤峰山金红岭有色矿业有限责任公司科研资助项目(编号:QT-YY-T2022141)的成果. This work was supported by the research project from the Chifeng Hongling Nonferrous Mining Co.,Ltd.(No.QT-YY-T2022141) （编号:QT-YY-T2022141）
