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Constraints on the crystal-chemistry of Fe/Mg-rich smectitic clays on Mars and links to global alteration trends

Authors
  • Joseph R, Michalski
  • Javier, Cuadros
  • Janice Bishop
  • Darby, Dyar
  • Vesselin, Dekov
  • Saverio, Fiore
Type
Published Article
Journal
Earth and Planetary Science Letters
Publisher
Elsevier
Publication Date
Sep 30, 2015
Volume
427
Pages
215–225
Source
SETI Institute
License
Unknown

Abstract

Near-infrared remote sensing data of Mars have revealed thousands of ancient deposits of Fe/Mg-rich smectitic clay minerals within the crust with relevance to past habitability. Diagnostic metal–OH infrared spectroscopic absorptions used to interpret the mineralogy of these phyllosilicates occur at wavelengths of 2.27–2.32 μm, indicating variable Fe/Mg ratios in the clay structures. The objective of this work is to use these near infrared absorptions to constrain the mineralogy of smectites on Mars. Using Fe/Mg-rich ...

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