地质通报2025，Vol.44Issue(4)：623-632,10.DOI:10.12097/gbc.2023.09.018
东昆仑造山带纳克秀马地区铀-钼矿化时代及其对区域热液铀成矿的启示
Uranium-molybdenum mineralization age in Nakexiuma area of East Kunlun Orogenic Belt and its implications for regional hydrothermal uranium mineralization
摘要
Abstract
[Objective]The East Kunlun Orogenic Belt(EKOB)is one of China's most significant metal ore-forming regions,housing a multitude of metal deposits,including Fe,Au,Cu,Ni,and Mo.Recent uranium exploration results have also demonstrated that the EKOB may be a crucial area for hydrothermal uranium deposits.Further research and analysis are required to comprehensively understand the geological conditions and characteristics of U mineralization in this area.To determine the hydrothermal uranium mineralization events in the EKOB and explore the regional uranium mineralization potential,[Methods]U-Mo mineralization at Nakexiuma in the EOKB was selected.Basing on the summarizing the geological features,the ore-forming epoch was explored.[Results]U mineralization at Nakexiuma primarily occurs within the fractures of quartz schists within the Tanjianshan Formation.Primary uranium minerals identified are uraninite and brannerite,indicating a high-temperature hydrothermal U mineralization.Elemental analysis shows that most uraninite analyses from the Nakexiuma area exhibit low concentrations of Ca,Si,and Fe,moderate to low contents of Th,and moderate to high U/Th ratios.The chemical ages(U-Th-Pb)of these analyses range from 229 Ma to 280 Ma,with the smallest U-Th-Pb age likely representing the age of U mineralization at Nakexiuma.[Conclusions]This age aligns with the youngest granitic magmatic age at Nakexiuma,suggesting that hydrothermal fluids may have originated from the Triassic granitic magmatism.Building upon previous research,this study proposes the possibility of an Early Mesozoic hydrothermal U mineralization event in the northwest China.The areas that develop Paleozoic to Mesozoic igneous rocks in the NW China should be a focal point for future uranium exploration.关键词
高温铀成矿/晶质铀矿/成矿年代/纳克秀马/东昆仑Key words
high temperature U mineralization/uraninite/metallogenetic age/Nakexiuma/East Kunlun分类
天文与地球科学引用本文复制引用
王凯兴,刘松林,戴佳文,刘晓东,余驰达..东昆仑造山带纳克秀马地区铀-钼矿化时代及其对区域热液铀成矿的启示[J].地质通报,2025,44(4):623-632,10.基金项目
国家自然科学基金面上项目《青海海德乌拉地区A型中—酸性火山岩成因及其铀成矿作用研究》(批准号:42072095)、青海省科学技术厅重点研发与转化计划《青海省东昆仑火山岩型铀矿资源调查理论创新与找矿突破》(编号:2021-SF-157)、江西省科技厅科技计划项目-对外科技合作计划《江西主要热液铀矿床成矿时代的厘定:基于铀矿物SIMS原位U-Pb同位素定年技术)(编号:20212BDH81006)和中国核工业地质局高校科研攻关项目《西北古生代铀成矿作用与成矿规律研究》(编号:201619) （批准号:42072095）
