摘要
短波红外(SWIR)光谱技术是蚀变矿物鉴别与光谱参数分析的关键手段。然而,不同仪器间潜在的系统误差严重制约了国内外光谱数据的横向对比与融合。本研究采用国产常用的CSD350A光谱仪与国际通用的ASD TerraSpec 4光谱仪,对西藏甲玛、河南夜长坪和福建悦洋三个矿床的1628个样品进行了系统测试,从矿物识别精度、光谱特征参数及空间分布趋势三个维度开展对比分析。研究结果表明,两种仪器对矿物大类的识别具有较高一致性,但在矿物亚类细分中存在显著差异,尤其是在区分白云母族矿物中伊利石与云母方面。在光谱参数方面,两种仪器在吸收特征峰位置检测上表现出明显的系统误差,其中TerraSpec 4仪器测试值普遍偏高,不同吸收峰位置的系统误差范围为2~6 nm;而吸收深度、光谱成熟度及半高宽等参数的差异相对较小。空间趋势对比分析显示,由两种仪器获得的光谱参数变化规律在空间分布上具有一致性,但在实际应用中需考虑具体数值的系统偏差。本研究系统提供了常用蚀变矿物在国内外光谱仪器间的识别结果及其光谱参数的系统误差,为不同仪器间数据的标准化处理提供依据。
Shortwave infrared(SWIR)spectroscopy is a crucial technique for identifying alteration minerals and analyzing spectral parameters.However,potential systematic errors between different spectrometers impede the crosscomparison and integration of spectral data on a global scale.This study systematically evaluates the performance of the domestically developed CSD350A spectrometer against the widely used ASD TerraSpec 4 spectrometer by comprehensively testing 1628 samples from the Jiama porphyry-skarn Cu-Mo-Au deposit in Xizang,the Yechangping porphyry-skarn Mo-W deposit in Henan,and the Yueyang intermediate-sulfidation epithermal deposit in Fujian.The comparative analysis focuses on mineral identification,spectral parameters,and spatial distribution trends.The results demonstrate that both instruments exhibit high consistency in identifying mineral groups but show significant differences in classifying specific mineral species,particularly in distinguishing illite from other micas in the white mica group.Regarding spectral parameters,the wavelengths of absorption features obtained by the TerraSpec 4 are consistently higher,with systematic offsets ranging from 2 nm to 6 nm across different features.In contrast,differences in absorption depth,spectral maturity,and full width at half maximum are minimal.Spatial trend analysis indicates that the spectral parameters from both instruments exhibit consistent spatial patterns.However,systematic offsets in numerical values should be taken into account in practical applications.This study provides a comprehensive set of identification results for common alteration minerals and the discrepancies in their spectral parameter between domestic and international spectrometers.The findings provide a quantitative foundation for data standardization across different instruments.
作者
赵骏峰
朱亚博
王雪娜
陈华勇
肖兵
杨征坤
杜亮
ZHAO Junfeng;ZHU Yabo;WANG Xuena;CHEN Huayong;XIAO Bing;YANG Zhengkun;DU Liang(State Key Laboratory of Deep Earth Processes and Resources,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou 510640,Guangdong,China;Xizang Huatailong Mining Development Co.,Ltd.,Lhasa 850200,Xizang,China)
出处
《大地构造与成矿学》
北大核心
2026年第1期179-194,共16页
Geotectonica et Metallogenia
基金
中国黄金集团“典型斑岩-矽卡岩型矿床蚀变矿物勘查标志研究与靶区圈定”项目(ZJZY-2023-KY02)
国家自然科学基金重点项目(42230810)联合资助。
关键词
蚀变矿物
短波红外光谱
矿物勘查
光谱仪
系统误差
alteration minerals
SWIR spectroscopy
mineral exploration
spectrometers
systematic error
