Phyllosilicates and sulfates at Endeavour Crater, Meridiani Planum, Mars
Article first published online: 4 NOV 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 21, November 2009
How to Cite
2009), Phyllosilicates and sulfates at Endeavour Crater, Meridiani Planum, Mars, Geophys. Res. Lett., 36, L21201, doi:10.1029/2009GL040734., , , , , , , and (
- Issue published online: 4 NOV 2009
- Article first published online: 4 NOV 2009
- Manuscript Accepted: 21 SEP 2009
- Manuscript Revised: 20 SEP 2009
- Manuscript Received: 31 AUG 2009
 Phyllosilicates have been identified on the Martian surface from orbit, and are hypothesized to have formed under wet, non-acidic conditions early in the planet's history. Exposures of these minerals have not yet been examined by a landed mission. Using Mars Reconnaissance Orbiter data, we report the detection of phyllosilicate-bearing outcrops that may be accessible by the Mars Exploration Rover Opportunity currently exploring Meridiani Planum. The phyllosilicates are associated with layered, polygonally fractured rocks exposed in the rim of the 20 km diameter crater Endeavour. These rocks may have formed via regional or global-scale processes of aqueous alteration that predated the period of acid sulfate formation recorded in the rocks that Opportunity has studied to date. Detailed characterization by Opportunity could better constrain the conditions under which these phyllosilicates formed. Hydrated sulfates are also detected from orbit in the plains adjacent to Endeavour's rim, providing the first opportunity for ground truth of these detections.