Deformation Sequence,Metallogenic Age Setting and Ore-Controlling Structures of Longwangjiang Gold-Antimony Ore-Field in West Hunan,South China
Zhao Yanglian
Li Bin
Bai Daoyuan
Deng Xin
Chen Jianfeng
Zeng Guangqian
Huang Jianzhong
Xu Deru
Abstract：To clarify the deformation sequence and ore-controlling structures of the Longwangjiang Au-Sb ore-field in West Hunan,as well as to reveal the age and tectonic setting of its formation,it conducted detailed structural analyses and LA-ICP-MS U-Pb dating of ore-bearing quartz vein hydrothermal zircon.Additionally,it comprehensively analyzed regional tectonic evolution and age data.The study area underwent six stages of structural deformation events,progressing from early to late:Late Silurian NW-NWW compression,late Middle Triassic NW-NWW compression,late Late Triassic near SN compression,late Middle Jurassic NWW compression,Cretaceous regional NW-SE extension,and Mid-Late Cenozoic NEE-NE compression.The LA-ICP-MS U-Pb age of the quartz vein hydrothermal zircon was determined to be(211.8±4.8)Ma.The comprehensive analysis suggests that:mineralization primarily occurred during the Late Triassic(211-206 Ma)and the formation of the Longwangjiang ore-field is associated with late-stage hydrothermal activity triggered by the collision of the Indochina period with the South China margin during the intracontinental collision phase.The ore-field is situated within a block confined by the reverse thrust of the Longwangjiang fault(F1)and the Heitupo fault(F2).The F1 and F3 faults serve as ore-guiding structures,while the NE-NNE-trending strong foliated zones(shear zones)and the Jiangdongwan fault serve as ore-distributing and ore-bearing structures simultaneously.The ore-distributing and ore-bearing structures in the deep parts of the ore deposit have great mineral exploration potential;the Taojinping-Huomaotang area is a key region for exploration due to concentrated structural stress.
Keywords：deformation sequenceU-Pb dating of hydrothermal zirconmetallogenic age and settingore-controlling structureLongwangjiang Au-Sb ore-fieldJiangnan orogen
Publication Date：2025-11-30
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：23( 4300-4322 )