摘要
运用热红外反射光谱技术建立花岗伟晶岩型锂矿识别方法,可以用来对目标靶区开展含矿性快速评价工作。锂辉石在热红外波段主要存在四个吸收峰,波长位置分别位于8 600 nm, 9 150 nm, 9 350 nm和11 670 nm处附近,其中11 670 nm处的吸收峰是锂辉石矿物的特征吸收峰,吸收深度为0.021 9~0.042 0。通过对锂辉石花岗伟晶岩、花岗伟晶岩、辉石角岩和灰岩等样品热红外波段的光谱特征进行分析,结果表明当11 670 nm处的吸收深度大于0.008时,样品主要为锂辉石花岗伟晶岩;吸收深度小于0.008时,样品主要为不含锂辉石的其它岩性。此外,11 670 nm处的吸收深度与锂元素含量具有较好的相关性,相关系数为0.636 1,可以用来建立锂元素定量反演模型。
Thermal infrared reflectance spectroscopy is adopted for recognition and rapid evaluation of granitic pegmatite type lithium ore deposit in the target area.Spodumene in the study area mainly has four absorption peaks in the thermal infrared band,and the wavelength positions are at around 8600 nm,9150 nm,9350 nm and 11670 nm respectively.Among them,the absorption peak at 11670 nm is the character-istic absorption peak of spodumene mineral,with the absorption depth of 0.0219-0.0420.Analysis of the thermal infrared spectral characteristics of spodumene granite pegmatite;granitic pegmatite,pyroxene hornstone and limestone samples shows that when the absorption depth at 11670 nm is greater than 0.008,the lithology is mainly spodumene granite pegmatite;and when the absorption depth is less than 0.008,the lithology is mainly country rock.In addition,the absorption depth at 11670 nm has a good cor-relation with the content of lithium with a correlation coefficient of 0.6361,which can be used to establish a quantitative inversion model of lithium.
作者
张弘
高卿楠
郭东旭
Zhang Hong;Gao Qingnan;Guo Dongxu(Cores and Sam ples Center of Natural Resources,Sanhe,Hebei 065201,China)
出处
《矿物岩石》
CAS
CSCD
北大核心
2021年第1期25-31,共7页
Mineralogy and Petrology
基金
地质调查项目“实物地质资料汇集与服务”(DD20190411)。
关键词
锂辉石
热红外光谱
花岗伟晶岩型锂矿
定量反演
spodumene
thermal infrared spectroscopy
granitic pegmatite type lithium deposit
quantita-tive inversion
