【引用本文】 代晶晶, 王登红, 代鸿章, 等. 川西甲基卡锂矿基地典型岩石及矿物反射波谱特征研究[J]. 岩矿测试, 2018, 37(5): 507-517. doi: 10.15898/j.cnki.11-2131/td.201701110003
DAI Jing-jing, WANG Deng-hong, DAI Hong-zhang, et al. Reflectance Spectral Characteristics of Rocks and Minerals in Jiajika Lithium Deposits in West Sichuan[J]. Rock and Mineral Analysis, 2018, 37(5): 507-517. doi: 10.15898/j.cnki.11-2131/td.201701110003

川西甲基卡锂矿基地典型岩石及矿物反射波谱特征研究

1. 

中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037

2. 

中国地质大学(北京)地球科学与资源学院, 北京 100082

收稿日期: 2017-01-11  修回日期: 2017-06-12  接受日期: 2018-06-11

基金项目: 中国地质调查局地质调查工作项目“大宗急缺矿产和战略性新兴产业矿产调查”工程“川西甲基卡大型锂矿资源基地综合调查评价”(DD20160055);“华南重点矿集区稀有稀散和稀土矿产调查”(DD20160056)

作者简介: 代晶晶, 博士, 副研究员, 硕士生导师, 研究方向为遥感地质。E-mail:daijingjing863@sina.com

Reflectance Spectral Characteristics of Rocks and Minerals in Jiajika Lithium Deposits in West Sichuan

1. 

Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

2. 

School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

Received Date: 2017-01-11
Revised Date: 2017-06-12
Accepted Date: 2018-06-11

摘要:四川甲基卡矿田是中国乃至于世界上锂矿资源最集中的地区之一,目前对甲基卡锂矿床的光谱学认识还很欠缺。本文运用地物波谱仪对甲基卡地区野外采集的典型岩石及矿物开展波谱测试,建立了研究区样品的波谱数据库,总结了黑云母片岩、十字石片岩、十字石堇青石片岩、角岩、二云母花岗岩、含锂辉石伟晶岩、不含锂辉石伟晶岩、石英脉、长石斑晶、锂辉石、云母、绿柱石的波谱特征。研究结果表明:围岩与岩体波谱特征差异较大,围岩反射率一般在0.2以下,吸收特征不明显,岩体反射率一般在0.5以下,具有1413 nm、1911 nm、2197 nm三处不同程度的吸收特征;其中含矿伟晶岩、不含矿伟晶岩及花岗岩可以通过1413 nm及2197 nm等处的吸收特征进行区分;锂辉石及绿柱石具有独特的波谱特征,可以直接用于找矿。本文开展的甲基卡型锂矿地面波谱研究,对其高光谱遥感填图及地质找矿具有重要的指导意义。

关键词: 甲基卡, 典型岩石及矿物, 地物波谱仪, 波谱测量

要点

(1) 开展了川西甲基卡锂矿床典型岩石及矿物的波谱特征研究。

(2) 伟晶岩与围岩可以通过波谱特征区分。

(3) 含锂辉石伟晶岩与不含锂辉石伟晶岩可以通过波谱特征区分。

Reflectance Spectral Characteristics of Rocks and Minerals in Jiajika Lithium Deposits in West Sichuan

ABSTRACT

BACKGROUND:

The Sichuan Jiajika ore field is one of the most concentrated areas of lithium resources in China and even in the world. At present, the understanding of the spectroscopy of the Jiajika lithium deposit is still very poor.

OBJECTIVES:

To better understand the spectra of lithium ore deposits and provide the basis for hyperspectral study of lithium ore deposits by spectrum measurement of typical rocks.

METHODS:

Spectra of typical rocks and minerals collected in Jiajika area were measured by Analytical Spectral Devices (ASD) FieldSpec-4 Spectroradiometer and a spectral library of this area was built. The spectral characteristics of rocks and minerals including biotite schist, grenatiteschist, grenatite cordieriteschist, hornstone, granite, pegmatite containing spodumene, pegmatite without spodumene, quartz vein, feldspar, spodumenemono, biotite, aquamarine were analyzed.

RESULTS:

The results indicate that there are differences in spectral characteristics between rock masses and surrounding rocks. The reflectance of surrounding rocks is less than 0.2, and absorption characteristics are not obvious, whereas the reflectance of rock masses is less than 0.5, and there are three absorption features at 1413 nm, 1911 nm, 2197 nm. In addition, granite, pegmatite containing spodumene, and pegmatite without spodumene can be discriminated by their unique spectra on 1413 nm and 2197 nm. The unique spectral characteristics of spodumene and aquamarine can be applied for ore exploration.

CONCLUSIONS:

The research on the surface spectroscopy of the Jiajika type lithium ore deposit carried out in this paper has important guiding significance for hyperspectral remote sensing mapping and geological prospecting.

KEY WORDS: Jiajika, typical rocks and minerals, Ground-Object Spectrometer, spectrum measurement

HIGHLIGHTS

(1) Spectra of typical rocks and minerals collected in Jiajika lithium deposits were studied.

(2) There are great differences between the spectra of rock masses and surrounding rocks.

(3) Pegmatite containing spodumene and pegmatite without spodumene can be discriminated by their characteristic spectra.

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川西甲基卡锂矿基地典型岩石及矿物反射波谱特征研究

代晶晶, 王登红, 代鸿章, 刘丽君, 令天宇