甘肃阿克塞县变粒岩型铌钽矿综合找矿方法及找矿模型  

Comprehensive Prospecting Methods and Model of the Leptynite-Type Nb-Ta Deposit in Aksai County,Gansu Province

作　　者：吴义布[1] 余君鹏[1,2] 司豪佳 董国强 褚广博[1] 司东泽 李通国 徐磊[1] WU Yibu;YU Junpeng;SI Haojia;DONG Guoqiang;CHU Guangbo;SI Dongze;LI Tongguo;XU Lei(Geological Survey of Gansu Province,Lanzhou,Gansu 730000;School of Earth Sciences,Lanzhou University,Lanzhou,Gansu)

机构地区：[1]甘肃省地质调查院,甘肃兰州730000 [2]兰州大学地质科学与矿产资源学院,甘肃兰州730000

出　　处：《地质与勘探》2023年第3期570-579,共10页Geology and Exploration

基　　金：国家重点研发计划项目“我国稀有金属矿床形成的深部过程与综合探测技术示范”(编号:2017YFC0602400);甘肃省地质勘查基金项目“甘肃省阿克塞县余石山铌钽多金属矿普查”(编号:201601-D03)联合资助。

摘　　要：甘肃阿克塞县余石山变粒岩型铌钽矿是近年在国内新区新层位发现的一种新类型铌钽矿床,其矿床规模已达大型,但对变粒岩型铌钽矿有效的综合找矿方法总结研究不够系统。本次依托1∶5万矿产地质调查和余石山铌钽矿普查等工作成果,系统梳理和分析总结了余石山铌钽矿的有效找矿方法,发现地质、地球化学、地球物理多学科综合找矿方法能快速准确定位铌钽矿带,总结了余石山铌钽矿表格式综合找矿模型,并提出了变粒岩型铌钽矿综合找矿方法组合:(1)优选熬油沟组地层分布区内的1∶5万水系沉积物测量Nb-Ta-La-Ce-Y组合异常和1∶5万地面高精磁测高磁异常的叠加区,确定为铌钽矿的找矿靶区;(2)在1∶5000岩石剖面测量和1∶2000高精磁测剖面浓缩物化探异常的同时,结合矿区大比例尺填图快速圈定铌钽矿带,推断隐伏-半隐伏矿带的有利部位;(3)槽探工程地表圈定矿体,深部钻探验证并寻找隐伏-半隐伏矿。The Yushishan leptynite-type Nb-Ta deposit in Akesai County of Gansu Province is a new type of Nb-Ta deposit,discovered in new strata of new area.It has reached a large deposit scale.However,the effective comprehensive prospecting methods for the leptynite-type Nb-Ta deposit have not been systematically studied.Based on the results of 1∶50,000 mineral geological survey and mineral survey of Yushishan Nb-Ta deposit,the effective prospecting methods of Yushishan Nb-Ta deposit were systematically sorted out and analyzed.Multi-discipline comprehensive prospecting methods of geology,geochemistry and geophysics were discovered to be capable of quickly and correctly locating the leptynite-type Nb-Ta ore belt.The comprehensive prospecting model of Yushishan Nb-Ta deposit was summarized and a combination of comprehensive prospecting methods for leptynitetype Nb-Ta deposit was proposed.(1)The prospecting target area for the Nb-Ta deposit is preferred to be the superposition area of 1∶50,000 stream sediment survey Nb-Ta-La-Ce-Y assemblage anomalies and 1∶50,000 ground high-precision magnetic anomaly in the Aoyougou Formation.(2)Geophysical and geochemical anomalies of 1∶5000 rock profile survey and 1∶2000 high-precision magnetic profile are concentrated.Combined with large-scale mapping in the mining area,the Nb-Ta ore belt will be rapidly delineated,and the favorable parts of concealed and semi-concealed ore belt will be inferred.(3)The ore bodies are delineated by the exploratory trench on the surface,and the concealed and semi-concealed orebodies are verified and searched by deep drilling.

关 键 词：变粒岩型铌钽矿 找矿方法 找矿模型 余石山 阿克塞县 甘肃 

分 类 号：P624[天文地球—地质矿产勘探]