甘肃北山臭水沟VMS型铜多金属矿千枚状玄武质凝灰岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb age of the phyllitic basaltic tuff from Choushuigou VMS-type copper polymetallic deposit in Beishan region,Gansu Province,and its geological implication
摘要
Abstract
In recent years,a new breakthrough in mineral exploration has been achieved in the Choushuigou area of Beishan,Gansu Province,where medium-sized and above VMS-type copper polymetallic deposits have been discovered.However,there is still controversy over their diagenesis and mineralization age,and a lack of precise dating basis has constrained the summary of mineralization laws and analysis of mineralization processes.Based on field geolog-ical surveys,the LA-ICP-MS zircon U-Pb dating was employed to conduct high-precision isotopic chronology on the ore-hosting phyllitic basaltic tuff.The U-Pb age of the zircon is 277.4±0.72 Ma,which is from the late Early Per-mian period.Therefore,it is classified as the Permian Jinta Formation rather than the previously classified Carbon-iferous Hongliuyuan Formation,indicating that the late Early Permian was also an important period for submarine volcanic-hydrothermal mineralization in the area.Comprehensive analysis demonstrates that the diagenesis and min-eralization in the Choushuigou area occurred within an extensional rift setting during the Early Permian.The deposit exhibits definitive characteristics of the VMS-type copper polymetallic deposit,and the phyllitic basaltic tuff of the Permian Jinta Formation and VMS-type copper polymetallic deposits are key directions for breakthroughs in regional mineral exploration.关键词
千枚状玄武质凝灰岩/U-Pb同位素年龄/早二叠世/臭水沟VMS型铜多金属矿/甘肃北山Key words
phyllitic basaltic tuff/U-Pb isotopic age/Early Permian/Choushuigou VMS-type copper polymetallic deposit/Beishan region of Gansu Province分类
天文与地球科学引用本文复制引用
杨永春,宋小宏,刘文浩,张旭,张立涛,王刚刚,王学银,樊新祥,戴霜,杨涛,刘家军,徐沛斌..甘肃北山臭水沟VMS型铜多金属矿千枚状玄武质凝灰岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].岩石矿物学杂志,2026,45(3):468-484,17.基金项目
甘肃省自然科学基金项目(26JRRF002) （26JRRF002）
甘肃省自然资源厅科技创新项目(202424) （202424）
甘肃省重点人才项目(2025RCXM039) （2025RCXM039）
甘肃省自然资源重点人才项目(甘资人函[2024]65号) （甘资人函[2024]65号）
甘肃省重大专项计划项目(26ZDFF001) （26ZDFF001）
中央引导地方科技发展资金项目(24ZYQF001) （24ZYQF001）
甘肃省瓜州县臭水沟石灰岩(铜)矿资源储量核实项目(Sky-zdzx/[2024]046号) Gansu Provincial Natural Science Foundation Project(26JRRF002) （铜）
Scientific and Technological Innovation Project of Gansu Provincial Department of Natural Resources(202424) （202424）
Projects of Gansu Provincial Key Talent(2025RCXM039) （2025RCXM039）
Gansu Provincial Natural Resources Key Talent(Gan Zi Ren Han[2024]65) （Gan Zi Ren Han[2024]65）
Gansu Provincial Major Special Project(26ZDFF001) （26ZDFF001）
Central Government Guides Local Science and Technology Development Fund(24ZYQF001) （24ZYQF001）
Mineral Resources and Mineral Reserves Review of Choushuigou Limestone(Copper)Deposit in Guazhou County,Gansu Province(Sky-zdzx/[2024]046) （Copper）
