桂林理工大学学报2025，Vol.45Issue(6)：795-809,15.DOI:10.3969/j.issn.1674-9057.2025.06.001
南岭西段越城岭地区加里东期锡成矿作用
Caledonian tin mineralization in Yuechengling area,western Nanling Range:a case of Tongyoucun tin deposit in northeastern Guangxi
摘要
Abstract
The Yuechengling area,situated in the western segment of Nanling metallogenic belt,is recognized as one of the crucial Caledonian W-Sn mineralization prospective zones in South China due to its superior metal-logenic geological conditions and dense distribution of mineralized occurrences.A systematic investigation into its petrogenesis-metallogenic coupling mechanisms is indispensable for both theoretical research and achieving exploration breakthroughs.This study focuses on Tongyoucun tin deposit and its ore-forming granites as key re-search subjects.A systematic investigation is conducted,encompassing petrological analyses,zircon U-Pb and cassiterite U-Pb geochronology,whole-rock geochemical studies,and exploring their genetic relationships with tin mineralization.Geochemical results reveal that the granites in mining area exhibit SiO2 and K2O contents of 76.00％-77.66％and 4.78％-6.64％respectively,with an aluminum saturation index(ASI)of 1.16-1.68 and a differentiation index(DI)of 88.77-95.10,classifying them as the highly fractionated S-type granites within the strongly peraluminous high-K calc-alkaline series.The zircon and cassiterite U-Pb dating results show that the intrusion age of granite is 438.0±10.0 Ma.The tin-bearing greisen-type and fracture-zone vein-type cassiterite U-Pb ages in mining area are 429.1±3.4 Ma and 413.5±4.1 Ma,respectively.These data in-dicate that both magmatic intrusion and tin mineralization events occurred during Late Caledonian period,with mineralization slightly postdating the granite emplacement.The significant temporal gap between tin mineraliza-tion stages suggests the existence of two-stage tin mineralization events in Tongyoucun area,potentially linked to late-stage intrusions related to tin mineralization at depth.Petrogeochemical characteristics indicate that the granites in mining area are formed during the post-collisional tectonic setting of orogenic compression-to-exten-sion transition phase,representing a product of partial melting of ancient crust enriched in clay-rich metapelitic rocks.Comprehensive studies reveal that Caledonian magmatic activity in Yuechengling area can be subdivided into six phases,corresponding to five W-Sn mineralization events.Late-stage intrusions exhibit a specific metal-logenic affinity with W-Sn mineralization.关键词
地球化学/锆石U-Pb年龄/锡石U-Pb年龄/桐油村锡矿/越城岭地区/南岭西段Key words
geochemistry/zircon U-Pb age/cassiterite U-Pb age/Tongyoucun tin deposit/Yuechengling area/western Nanling Range分类
天文与地球科学引用本文复制引用
戴昱,刘希军,吴庆杰,许继峰,战明国,刘华应,黄凡,秦锦华,李智兴..南岭西段越城岭地区加里东期锡成矿作用[J].桂林理工大学学报,2025,45(6):795-809,15.基金项目
广西找矿突破战略行动地质矿产勘查项目(桂自然资函[2022]1165号) （桂自然资函[2022]1165号）
国家自然科学基金项目(42473063 （）
42162008 （）
42162018) （）
广西壮族自治区第七批八桂学者项目(刘希军) （刘希军）
中国地质科学院矿产资源研究所委托业务(地科资审[2024]N2303-48) （地科资审[2024]N2303-48）
