摘要
位于大兴安岭中南段的801矿床是我国最大的碱性花岗岩型稀有稀土矿床。当前该地区已开展过较多的地质年代学、地球化学和岩石矿物学等方面研究,而成矿物质的深部来源位置、成矿物质的运移通道、控矿的关键构造因素等尚未明确,外围勘查找矿工作迟迟未有较大突破。本文利用最新1∶2.5万高精度航空物探(磁、放)资料,识别出与成矿密切相关的主脊深大断裂和环形断裂构造,最新的航磁ΔT数据三维反演结果显示出深部隐伏花岗质侵入岩体的空间分布,揭示了该区特殊的岩浆活动、线-环断裂构造组合与稀有稀土矿成矿之间的耦合关系。认为该区深部隐伏花岗质侵入岩体和线-环断裂体系控制了801矿床的分布、形成和富集。同时,总结了801典型矿床航空地球物理找矿标志,推断了801矿外围碱性花岗岩的空间分布,找矿有利区以深部花岗质侵入体为中心,在其顶上带沿环状断裂系呈“卫星”状分布,特别是西部环状断裂带内有较大可能找到碱性花岗岩型稀有稀土矿,为下一步找矿勘查指明了方向。本研究对区域稀有稀土矿成矿研究及找矿勘查具有明确的指导价值。
The 801 deposit,located in the central-southern section of the Great Xing'an Range,is the largest alkaline granite-type rare and rare earth elements deposit(REE deposit)in China.At present,there have been many studies on geochronology,geochemistry,and rock mineralogy in the region.However,there is relatively little research on deep sources of ore-formingmaterials,the migration pathways of ore-forming materials,and the key structural factors controlling mineralization.Therefore,therehas been no significant breakthrough in peripheral exploration and prospecting work for a long time.This article uses the latest 1∶25000high-precision aerogeophysical(magnetic,gamma-ray spectrometry)data to identify the Zhuji ridge deep fault and circular faultstructures closely related to mineralization.The three-dimensional inversion results of aeromagneticΔT data show the spatialdistribution of hidden granite intrusive rocks,revealing the coupling relationship between the special magmatic activity,the line-ringfault structure combination,and rare-earth ore mineralization in the area.It is believed that the deep-seated granite intrusion and theline-ring fault structure in the area control the distribution,formation,and enrichment of the 801 REE deposit.At the same time,thetypical aerogeophysical prospecting indicators for REE deposits in 801 were summarized,and the spatial distribution of alkalinegranite in the periphery of the 801 deposit was inferred.The favorable area for prospecting is centered on the deep granite intrusion,which is distributed in a"satellite"shape along the circular fault system at its top.Especially in the western circular fault zone,thereis a high possibility of discovering alkaline granite-type REE deposits,which points out the direction for the next exploration andprospecting.This study has clear guiding value for the study of regional REE ore mineralization and exploration.
作者
何敬梓
葛藤菲
牛兴国
张林杰
范振宇
周道卿
王刚
李亮
HE Jingzi;GE Tengfei;NIU Xingguo;ZHANG Linjie;FAN Zhenyu;ZHOU Daoqing;WANG Gang;LI Liang(China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China;KeyLaboratory of Airborne Geophysics and Remote Sensing Geology,Ministry of Natural Resources,Beijing 100083,China;Comprehensive Survey Team of Inner Mongolia Autonomous Region Nonferrous Geological Exploration Bureau,Hohhot 010000,China)
出处
《沉积与特提斯地质》
北大核心
2025年第4期751-764,共14页
Sedimentary Geology and Tethyan Geology
基金
内蒙古自治区地质勘查项目([2024]-JC28)
中央引导地方科技发展资金项目(2023ZY0036)。
关键词
大兴安岭
稀有稀土矿
线-环断裂体系
航空物探
找矿勘查
Great Xing'an Range
rare metal and rare earth element deposit
line-ring fault structure
airborne geophysicalprospecting
mineral exploration and prospecting
