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Iron-Magnesium Phyllosilicates in Libya Montes
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Iron-Magnesium Phyllosilicates in Libya Montes

Acquired Date: June 12, 2008
Release Date: April 25, 2014
Latitude: 3.16 N
Longitude: 85.93 E
Keywords: Crater Interior/Rim/Ejecta, Ridges, Volcanic Feature, Hydrated Mineral, Mafic minerals, Phyllosilicate minerals, Dichotomy Boundary
Parameters: BD2210 (Al-OH minerals), D2300 (Fe-Mg phyllosilicates), OLINDEX3 (Olivine)

This image is located right along the rim of the Isidis impact basin, at the foot of Libya Montes. Here we see the interaction between olivine (red) and iron-magnesium phyllosilicates (green). The group of olivine minerals is known to have the simplest crystalline structure of all the silicate minerals and form at very high temperatures. Phyllosilicates are clay and clay-like minerals formed by chemical reactions with liquid water. They are very thin (microscopic) stacked layer crystal forms, also called sheet silicates.



This image is located right along the rim of the Isidis impact basin, at the foot of Libya Montes. Here we see the interaction between olivine (red) and iron-magnesium phyllosilicates (green). The group of olivine minerals is known to have the simplest crystalline structure of all the silicate minerals and form at very high temperatures. Phyllosilicates are clay and clay-like minerals formed by chemical reactions with liquid water. They are very thin (microscopic) stacked layer crystal forms, also called sheet silicates.

In hydrothermal situations, where both heat and water are present, olivine can be weathered down into a clay mineral. It can be altered by leaching where it absorbs different chemicals and water into its crystalline structure or by removing the silica that is present. When olivine is broken down into this raw form, it usually makes the mineral serpentine. While not shown in this particular CRISM image, serpentine can be found in the Nili Fossae region (located off of the northwestern rim of Isidis basin).

Link to further description of the spectral parameters shown in this image can be found here.

Disclaimer: Colors shown here represent indicators of mineralogy and are not what the human eye would see.

Acknowledgements: THEMIS, MOLA, CRISM, Google Earth.

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is one of six science instruments on NASA's Mars Reconnaissance Orbiter. Led by The Johns Hopkins University Applied Physics Laboratory, the CRISM team includes expertise from universities, government agencies and small businesses in the United States and abroad.

CRISM's mission: Find the spectral fingerprints of aqueous and hydrothermal deposits and map the geology, composition and stratigraphy of surface features. The instrument also tracks seasonal variations in dust and ice aerosols in the Martian atmosphere, and water content in surface materials — leading to new understanding of the climate.

Credit: NASA/JPL/JHUAPL

   

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