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Determining physical and mechanical volcanic rock properties via reflectance spectroscopy.
Determining physical and mechanical volcanic rock properties via reflectance spectroscopy.
- Source :
-
Journal of Volcanology & Geothermal Research . Dec2021, Vol. 420, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- There are currently no reliable methods to determine rock physical and mechanical properties that are not labor or resource intensive, especially at the scale of volcanoes. Using mineralogical-physical-mechanical relationships, we suggest it is possible to derive rock properties from rapid, non-invasive reflectance spectroscopy measurements. To demonstrate this potential, we correlate the physical and mechanical properties of variously altered andesitic volcanic rocks to laboratory reflectance spectroscopy using statistical analysis. Several rock properties, including density, connected porosity, strength, magnetic susceptibility, and elasticity, correlate with reflectance spectroscopy in both the visible and short-wave infrared parts of the electromagnetic spectrum. We attribute these correlations to the presence and degradation (i.e. weathering or hydrothermal alteration) of iron-bearing minerals such as pyroxene, magnetite, and pyrite, which reflect changes to both rock properties and reflectance spectroscopy measurements. Results support the use of transfer functions to estimate rock properties directly from reflectance spectroscopy. Ultimately, aerial or satellite imaging spectroscopy could be used to create geotechnical maps at volcano scale. • Laboratory reflectance spectroscopy correlates to many physical and mechanical rock properties. • Iron-bearing minerals are sensitive to weathering and hydrothermal alteration. • Their reflectance correlates well to rock properties such as strength and porosity. • Material property-reflectance correlations associated with clay minerals are poor. • Spectroscopy shows potential for predicting rock properties at large spatial scales. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03770273
- Volume :
- 420
- Database :
- Academic Search Index
- Journal :
- Journal of Volcanology & Geothermal Research
- Publication Type :
- Academic Journal
- Accession number :
- 153657256
- Full Text :
- https://doi.org/10.1016/j.jvolgeores.2021.107393