中国地质2026，Vol.53Issue(1)：16-35,20.DOI:10.12029/gc20240402002
新疆若羌县阿尔金砂梁西锂多金属矿床地质特征、成矿年龄及找矿潜力
Geologic characteristics,metallogenic age and prospecting potential in the Altyn Shaliangxi lithium polymetallic deposit,Ruoqiang County,Xinjiang
摘要
Abstract
This paper is the results of mineral exploration engineering. [Objective]Lithium,as a critical strategic mineral resource,plays an increasingly essential role in the development of the new energy sector.A newly discovered lithium polymetallic deposit in the Shaliangxi area of Ruoqiang County,Xinjiang,has attracted significant attention in recent years.This study aims to elucidate the geological setting,mineralization age,and genetic mechanisms of the deposit,and to assess its exploration potential,thereby providing a theoretical basis for future rare-metal prospecting.[Methods]Based on systematic field geological surveys,this research integrates petrographic analysis,geochemical characterization,and U–Pb isotopic dating of multiple zircon and ore mineral types.Laser ablation-inductively coupled plasma mass spectrometry(LA–ICP–MS)was employed to obtain high-precision U–Pb ages for zircons from biotite monzogranite,mineralized pegmatite,and for columbite–tantalite minerals.[Results]The study area lies in the foreland zone at the junction of the Altyn Tagh orogenic belt and the southern margin of the Tarim Basin,characterized by intense tectonic activity.Exposed lithologies are dominated by the Changcheng and Jixian systems,composed mainly of biotite quartz schist,siliceous rock,and marble.The stratigraphic sequence exhibits structural inversion and overall southward dip due to regional thrust faulting and nappe deformation.Intrusive granitic bodies are developed in the southern part of the area.Three spodumene-bearing pegmatite dike zones have been identified,delineating 25 lithium-bearing ore bodies.The longest individual ore body extends up to 776 m with a maximum thickness of 7.7 m.Li2O grades range from 0.80%to 1.84%,accompanied by(Nb,Ta)2O5 concentrations of 0.032%~0.091%.The estimated Li2O resource scale reaches or exceeds the medium-sized deposit threshold.Zircon U-Pb dating indicates an age of(440.9±4.6)Ma for the biotite monzogranite(Early Silurian),while zircons in the pegmatites are predominantly inherited grains older than 736 Ma.The columbite-tantalite U–Pb age constrains the mineralization to(228.8±5.8)Ma(Late Triassic).[Conclusions]The Shaliangxi lithium polymetallic deposit is classified as a typical granitic pegmatite-type lithium deposit.Its mineralization age(Late Triassic)is significantly younger than the emplacement age of the Caledonian granites in the region,indicating no direct genetic relationship between the two.The formation of the deposit is likely linked to deep crustal remelting events triggered by tectonic regime transformation during the Indosinian orogeny.These findings define a new temporal window for rare metal mineralization within the Altyn metallogenic belt and highlight the region's considerable exploration potential.关键词
锂多金属矿/花岗伟晶岩/地质特征/成矿时代/找矿潜力/矿产勘查工程/阿尔金/新疆Key words
lithium polymetallic deposit/granitic pegmatite/geological characteristics/mineralization age/exploration potential/mineral exploration engineering/Altyn Tagh/Xinjiang分类
天文与地球科学引用本文复制引用
沈明宏,王核,孙子龙,牟伦洵,韩红卫,朱宝彰,杜晓飞,蔡铭泽,张嵩..新疆若羌县阿尔金砂梁西锂多金属矿床地质特征、成矿年龄及找矿潜力[J].中国地质,2026,53(1):16-35,20.基金项目
国家重点研发专项(2021YFC2901904-4)、第二次青藏高原综合科学考察(2019QZKK0802)、中国科学院前瞻战略科技先导专项(XDA0430102)联合资助. Supported by the National Key Research and Development Program of China(No.2021YFC2901904-4),the Second Comprehensive Scientific Expedition to the Tibetan Plateau(No.2019QZKK0802)and the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA0430102). （2021YFC2901904-4）
