世界核地质科学2024，Vol.41Issue(1)：47-62,中插1-中插6,22.DOI:10.3969/j.issn.1672-0636.2024.01.005
新疆白杨河铀矿区白色云母短波红外光谱及电子探针成分特征
Short-wavelength infrared spectroscopy and EPMA of white mica from Baiyanghe uranium district in Xinjiang
摘要
Abstract
Uranium is one of the critical metals in China,and it is of great significance to the development of science and technology and national security.The Baiyanghe uranium deposit is an important hydrothermal uranium deposit,and white mica is widely developed in the process of uranium mineralization.Studies have shown that the shortwave infrared spectra of white mica contain rich geological information,recording its formation environment and its relationship with mineralization,however,systematical variation rules to shortwave infrared spectral parameters of white mica and geological influencing factors are still poorly known.In this paper,we use shortwave infrared spectroscopy and electron probe analysis to study the white mica from Baiyanghe uranium deposit.The results indicate that white mica with Al-OH absorption wavelengths from the Baiyanghe uranium deposit range from 2 190 nm to 2 220 nm,and the geochemical compositions indicate an obvious Tschermak substitution in white mica and suggest that variations in the Al-OH wavelengths of white mica are mainly affected by the Fe and Mg content and Fe/(Fe + Mg)ratios in addition to the wall rock composition.The white mica exhibiting a shorter Al-OH absorption wavelength indicates a relatively high-temperature hydrothermal environment,while the white mica with a longer Al-OH absorption wavelength suggests a relatively low-temperature hydrothermal environment.In addition,it is found that the white micas close to the uranium mineralization in the Baiyanghe uranium deposit,have shorter Al-OH wavelengths,greater ISM values,and lower FWHM 2 200 values than those with features unlike those near the uranium mineralization.The spatial distributions and variations in the Al-OH wavelengths,ISM values,and FWHM 2 200 values for white mica suggest that a hydrothermal mineralization center may be located in the northern contact zone between the Yangzhuang granite porphyry and the Devonian intermediate-acid volcanic rocks of the Baiyanghe uranium deposit.This study is of great practical significance for improving the genesis and for deep and peripheral exploration in Baiyanghe uranium deposit,and also has important reference value for the exploration of other hydrothermal metal minerals.关键词
短波红外光谱/白色云母/Al-OH特征吸收峰波长/白杨河铀矿床/热液流体环境Key words
shortwave infrared spectra/white mica/Al-OH wavelength/Baiyanghe uranium deposit/hydrothermal environment分类
天文与地球科学引用本文复制引用
徐清俊,叶发旺,张志新,张川,李新春,李瑞炜,田程..新疆白杨河铀矿区白色云母短波红外光谱及电子探针成分特征[J].世界核地质科学,2024,41(1):47-62,中插1-中插6,22.基金项目
受核能开发项目(编号:遥H2001)资助 Supported by Nuclear Power Development Project(No.遥H2001) （编号:遥H2001）
