期刊
JOURNAL OF SPECTROSCOPY
卷 2018, 期 -, 页码 -出版社
HINDAWI LTD
DOI: 10.1155/2018/6958260
关键词
-
资金
- Fundamental Research Grant Scheme of the National Natural Science Foundation of China [41502312]
- Chinese Ministry of Science and Technology [2015BAB05B0301]
- China Geological Survey Foundation [DD20160002]
- Fundamental Research Grant Scheme of the National Natural Science Foundation of China [41502312]
- Chinese Ministry of Science and Technology [2015BAB05B0301]
- China Geological Survey Foundation [DD20160002]
The mineral chemistry of twenty chlorite samples from the United States Geological Survey (USGS) spectral library and two other regions, having a wide range of Fe and Mg contents and relatively constant Al and Si contents, was studied via infrared (IR) spectroscopy, near-infrared (NIR) spectroscopy, and X-ray fluorescence (XRF) analysis. Five absorption features of the twenty samples near 4525, 4440, 4361, 4270, and 4182 cm(-1) were observed, and two diagnostic features at 4440 and 4280 cm-1 were recognized. Assignments of the two diagnostic features were made for two combination bands ((nu + delta)((AlAl)O-OH) and (nu + delta)((SiAl)O-OH)) by regression with IR fundamental absorptions. Furthermore, the determinant factors of the NIR band position were found by comparing the band positions with relative components. The results showed that Fe/(Fe + Mg) values are negatively correlated with the two NIR combination bands. The findings provide an interpretation of the NIR band formation and demonstrate a simple way to use NIR spectroscopy to discriminate between chlorites with different components. More importantly, spectroscopic detection of mineral chemical variations in chlorites provides geologists with a tool with which to collect information on hydrothermal alteration zones from hyperspectral-resolution remote sensing data.
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