短波近红外光谱技术在青海省铁勒木钨多金属矿区的应用  

Application of Short-Wave Near-Infrared Spectroscopy Technology in the Tielmu Tungsten-Polymetallic Ore Deposit,Qinghai Province

作　　者：张全成 赖华亮 周杨 赵海超 ZHANG Quancheng;LAI Hualiang;ZHOU Yang;ZHAO Haichao(The Fifth Geological Survey Institute of Qinghai Province,Xining,Qinghai 810003,China)

机构地区：[1]青海省第五地质勘查院,青海西宁810003

出　　处：《中国锰业》2024年第6期95-103,共9页China Manganese Industry

基　　金：青海省都兰县铁勒木钨多金属矿调查评价项目(编号:2024524105kc071)。

摘　　要：为考察短波近红外光谱技术(SWIR)在青海省铁勒木钨多金属矿区的应用效果及其对矿床勘查的贡献,采用便携式短波红外光谱矿物测量仪(PIMA)对矿区内的岩矿石进行光谱测试与解译。通过对253个测试点的光谱数据进行分析,识别出高岭石、绿泥石、角闪石等18种矿物,并建立了光谱勘查找矿标志和蚀变分带模型。结果显示,钨矿主要集中在特定深度的矽卡岩化带中,且结晶度(IC)在矿化区段呈现高值特征,表明其可作为有效的找矿标志。研究还发现,通过光谱吸收峰的波长变化,可以推断出矿物的成分变化及其与矿化的关系。研究表明,SWIR技术在矽卡岩型矿床的勘查中具有较高的应用价值,能够为矿床的深部预测和靶区圈定提供重要的技术支持。但该技术在识别某些矿物类型时存在局限性,需与其他地质方法联合使用以提高找矿精度。To examine the effectiveness of short-wave near-infrared spectroscopy(SWIR)technology in the Tielmu tungsten-polymetallic ore deposit in Qinghai Province and its contribution to ore deposit exploration,a portable short-wave infrared spectroscopy mineral analyzer(PIMA)was used to conduct spectral testing and interpretation of rock and mineral samples within the ore deposit.By analyzing spectral data from 253 testing points,18 minerals,including kaolinite,chlorite,and amphibole,were identified,and a spectral exploration mineralization indicator and alteration zoning model were established.The results indicate that tungsten ore is primarily concentrated in specific depths of skarn alteration zones,and the crystallinity index(IC)exhibits high values in mineralized sections,suggesting its potential as an effective exploration indicator.The study also found that changes in the wavelength of spectral absorption peaks can be used to infer variations in mineral composition and their relationship with mineralization.The research demonstrates that SWIR technology has high application value in the exploration of skarn-type ore deposits,providing important technical support for deep prediction and target area delineation of ore deposits.However,the technology has limitations in identifying certain types of minerals and needs to be used in conjunction with other geological methods to improve exploration accuracy.

关 键 词：短波近红外光谱技术 钨矿 矽卡岩化 矿床勘查 蚀变矿物分带 

分 类 号：P631.7[天文地球—地质矿产勘探]