The effects of magmatic evolution, crystallinity, and microtexture on the visible/near-infrared and thermal-infrared spectra of volcanic rocks

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11-08-2022
Geography

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The effects of magmatic evolution, crystallinity, and microtexture on the visible/near-infrared and thermal-infrared spectra of volcanic rocks

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rafikiedu03 rafikiedu03 · Answer 1 · 2022-08-17T20:28:40+02:00

The natural chemical and physical variations that occur within volcanic rocks (petrology) provide critical insights into mantle and crust conditions on terrestrial bodies.

Visible/close to-infrared (VNIR; zero.3–2.5 μm) and thermal infrared (TIR; 5–50 μm) spectroscopy are the principle gear to be had to remotely signify these substances from satellites in orbit. but, the accuracy of petrologic facts that can be won from spectra while rocks showcase complex variations in mineralogy, crystallinity, and microtexture happening collectively in herbal settings is not well restrained.

Here, we examine the spectra of a suite of volcanic planetary analog rocks from the 3 Sisters Volcanic complicated, Oregon to their mineralogy, chemistry, and microtexture from X-ray diffraction, X-ray fluorescence, and electron microprobe analysis. Our results imply that TIR spectroscopy is an effective petrologic tool in such rocks for modeling bulk mineralogy, crystallinity, and mineral chemistry.

Given a library with suitable glass endmembers, TIR modeling can derive glass abundance with similar accuracy as different predominant mineral groups and offer first-order estimates of glass wt.% SiO2 in glass-rich samples, however, can't successfully stumble on versions in microtexture and minor oxide minerals. In contrast, VNIR spectra regularly yield non-particular mineralogic interpretations due to overlapping absorption bands from olivine, glass, and Fe-bearing plagioclase.

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