Analysis of Rock Varnish from the Mojave Desert by Handheld Laser-Induced Breakdown Spectroscopy
| Autor: | Jeffrey R. Knott, Lewis A. Owen, Jason M. Dortch, Michelle Morency, Russell S. Harmon, Morgan Jennings, Daria Khashchevskaya |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
desert pavement
Desert varnish Pharmaceutical Science Mineralogy Organic chemistry Weathering Desert pavement microchemical mapping Article Analytical Chemistry geochemical fingerprinting QD241-441 Chemistry (miscellaneous) In situ analysis Drug Discovery Molecular Medicine rock varnish Laser-induced breakdown spectroscopy Optical emission spectroscopy Physical and Theoretical Chemistry Spectroscopy laser-induced breakdown spectroscopy (LIBS) Geology Colluvium |
| Zdroj: | Molecules, Vol 26, Iss 5200, p 5200 (2021) Molecules Volume 26 Issue 17 |
| ISSN: | 1420-3049 |
| Popis: | Laser-induced breakdown spectroscopy (LIBS) is a form of optical emission spectroscopy that can be used for the rapid analysis of geological materials in the field under ambient environmental conditions. We describe here the innovative use of handheld LIBS for the in situ analysis of rock varnish. This thinly laminated and compositionally complex veneer forms slowly over time on rock surfaces in dryland regions and is particularly abundant across the Mojave Desert climatic region of east-central California (USA). Following the depth profiling examination of a varnished clast from colluvial gravel in Death Valley in the laboratory, our in situ analysis of rock varnish and visually similar coatings on rock surfaces was undertaken in the Owens and Deep Spring valleys in two contexts, element detection/identification and microchemical mapping. Emission peaks were recognized in the LIBS spectra for the nine elements most abundant in rock varnish—Mn, Fe, Si, Al, Na, Mg, K, Ca and Ba, as well as for H, Li, C, O, Ti, V, Sr and Rb. Focused follow-up laboratory and field studies will help understand rock varnish formation and its utility for weathering and chronological studies. |
| Databáze: | OpenAIRE |
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