کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8867930 | 1621789 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Estimating the Mg# and AlVI content of biotite and chlorite from shortwave infrared reflectance spectroscopy: Predictive equations and recommendations for their use
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
کامپیوتر در علوم زمین
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چکیده انگلیسی
Shortwave infrared (SWIR, 1000-2500â¯nm) reflectance spectra of biotite and chlorite were investigated to establish quantitative relationships between spectral metrics and mineral chemistry, determined by electron microprobe analysis (EMPA). Samples spanning a broad range of mineral compositions were used to establish regression equations to Mg#, which can be estimated to ±3 and ±5 Mg#, and to AlVI content, which can be estimated to ±0.044 AlVI (11 O) and ±0.09 AlVI (14 O), respectively for biotite and chlorite. Both minerals have absorptions at common positions (1400, 2250, 2330â¯nm), and spectral interference may occur in mineral mixtures. For an equivalent Mg#, absorptions of chlorite are offset to 1-15â¯nm higher wavelengths relative to those of biotite. If the incorrect mineral is identified, errors in the estimation of composition may occur. Additionally, the 2250â¯nm absorption, which is related to Al(Mg,Fe)-OH in both minerals, is strongly affected by both the AlVI content and Mg#. This can lead to erroneous Mg# estimations in low AlVI samples. Recommendations to mitigate these issues are presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Applied Earth Observation and Geoinformation - Volume 68, June 2018, Pages 116-126
Journal: International Journal of Applied Earth Observation and Geoinformation - Volume 68, June 2018, Pages 116-126
نویسندگان
Philip Lypaczewski, Benoit Rivard,