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OA
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
近年来在甘肃北山臭水沟一带实现找矿新突破,发现了中型以上VMS型铜多金属矿床,但其成岩成矿时代尚存争议,缺乏精细的测年依据,制约了成矿规律的总结和成矿作用的分析.在野外地质调查的基础上,采用LA-ICP-MS锆石U-Pb精细测年技术,对赋矿的千枚状玄武质凝灰岩开展了U-Pb同位素年代学研究,测得其中锆石U-Pb年龄为277.4±0.72 Ma,为早二叠世晚期,因而将其归属为二叠系金塔组,而非前人所划分的石炭系红柳园组,表明早二叠世晚期亦是区内海底火山气液成矿作用的重要发生时期.综合分析表明,臭水沟成岩成矿作用发生在早二叠世拉伸背景下的裂谷环境中,矿床具有VMS型铜多金属矿床的特征,二叠系金塔组千枚状玄武质凝灰岩和VMS型铜多金属矿床为区域找矿突破的重要方向.
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.
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
兰州大学地质科学与矿产资源学院,甘肃兰州 730000||甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000兰州大学地质科学与矿产资源学院,甘肃兰州 730000||甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000兰州大学地质科学与矿产资源学院,甘肃兰州 730000甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局,甘肃兰州 730000中国地质大学(北京)地球科学与资源学院,北京 100083甘肃省矿产资源勘查重点实验室,甘肃兰州 730000||甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉 735000
天文与地球科学
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
phyllitic basaltic tuffU-Pb isotopic ageEarly PermianChoushuigou VMS-type copper polymetallic depositBeishan region of Gansu Province
《岩石矿物学杂志》 2026 (3)
468-484,17
甘肃省自然科学基金项目(26JRRF002)甘肃省自然资源厅科技创新项目(202424)甘肃省重点人才项目(2025RCXM039)甘肃省自然资源重点人才项目(甘资人函[2024]65号)甘肃省重大专项计划项目(26ZDFF001)中央引导地方科技发展资金项目(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)Scientific and Technological Innovation Project of Gansu Provincial Department of Natural Resources(202424)Projects of Gansu Provincial Key Talent(2025RCXM039)Gansu Provincial Natural Resources Key Talent(Gan Zi Ren Han[2024]65)Gansu Provincial Major Special Project(26ZDFF001)Central Government Guides Local Science and Technology Development Fund(24ZYQF001)Mineral Resources and Mineral Reserves Review of Choushuigou Limestone(Copper)Deposit in Guazhou County,Gansu Province(Sky-zdzx/[2024]046)
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