New insights into gully formation on Mars: Constraints from composition as seen by MRO/CRISM
| Autor: | Scott L. Murchie, Olivier S. Barnouin, Debra Buczkowski, Frank P. Seelos, Jorge I. Nunez, J. A. McGovern, Kimberly D. Seelos |
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| Rok vydání: | 2016 |
| Předmět: |
Martian
Mineral hydration 010504 meteorology & atmospheric sciences Water on Mars Earth science Evidence of water on Mars from Mars Odyssey Mars Exploration Program 01 natural sciences CRISM law.invention Orbiter Geophysics law 0103 physical sciences General Earth and Planetary Sciences Composition of Mars 010303 astronomy & astrophysics Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 43:8893-8902 |
| ISSN: | 0094-8276 |
| Popis: | Over 100 martian gully sites were analyzed using orbital data collected by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) and High Resolution Imaging Science Experiment (HiRISE) on the Mars Reconnaissance Orbiter (MRO). Most gullies are spectrally indistinct from their surroundings, due to mantling by dust. Where spectral information on gully sediments was obtained, a variety of mineralogies were identified. Their relationship to the source rock suggests that gully-forming processes transported underlying material downslope. There is no evidence for specific compositions being more likely to be associated with gullies, or with the formation of hydrated minerals in situ as a result of recent liquid water activity. Seasonal CO2 and H2O frosts were observed in gullies at mid- to high latitudes, consistent with seasonal frost-driven processes playing important roles in the evolution of gullies. Our results do not clearly indicate a role for long-lived liquid water in gully formation and evolution. |
| Databáze: | OpenAIRE |
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