Hydrous minerals on Mars as seen by the CRISM and OMEGA imaging spectrometers: Updated global view
Article first published online: 24 APR 2013
©2012. American Geophysical Union. All Rights Reserved.
Journal of Geophysical Research: Planets
Volume 118, Issue 4, pages 831–858, April 2013
How to Cite
2013), Hydrous minerals on Mars as seen by the CRISM and OMEGA imaging spectrometers: Updated global view, J. Geophys. Res. Planets, 118, 831–858, doi: 10.1029/2012JE004145., , , , and (
- Issue published online: 17 MAY 2013
- Article first published online: 24 APR 2013
- Manuscript Accepted: 12 DEC 2012
- Manuscript Revised: 1 NOV 2012
- Manuscript Received: 31 MAY 2012
- infrared spectroscopy;
- hydrated minerals;
- aqueous alteration
 The surface of Mars has preserved the record of early environments in which its basaltic crust was altered by liquid water. These aqueous environments have survived in the form of hydrological morphologies and alteration minerals, including clays and hydrated salts. Because these minerals probe on Earth aqueous environments compatible with biotic activity, understanding their formation processes on Mars is of great exobiological relevance and also offers insight into Earth's now erased ancient water environments. Using remote sensing, we conducted a large-scale investigation of the distribution, composition, age, and geomorphic settings of hydrous minerals on Mars, providing a sharpened global view of the early aqueous environments and their evolution with time. Aqueous alteration seems to have produced clays on a planetary scale but these are found to be restricted to the oldest observable terrains on Mars (∼4 Gyr). However, very diverse aqueous environments have also been found which suggest widespread, complex aqueous settings from the surface to kilometric depths, and spanning over 1 Gyr. By building a robust statistical sample of detections, the global trends inferred here attempt to provide a broad view of our current understanding of hydrous minerals on Mars and provide context for more localized, in-depth analyses. Collectively, these trends suggest that at least transient conditions have existed on Mars which may have been favorable for pre-biotic to biotic activity.