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Iron-manganese redox reactions in endeavour crater rim apron rocks
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gellert, R. Crumpler, L. S. Schroder, C. Farrand, W. H. Arvidson, R. E. Morris, R. V. Grant II, J. A. Jolliff, B. L. Parker, T. J. Ming, D. W. Peretyazhko, T. Clark, B. C. Yen, A. S. Mittlefehldt, D. W. |
| Copyright Year | 2015 |
| Description | The Mars Exploration Rover Opportunity has been exploring Noachian age rocks and outcrops on the rim of the 22 km diameter Endeavour crater since August 2011. The Cape York area is a low-lying rim of Endeavour that contains 3 distinct lithologies: 1) the stratigraphically lowest Matijevic fm of pre-impact lithology, 2) Shoemaker fm of impact breccias, and 3) the stratigraphically highest rim lithology Grasberg fm of post-impact sediments that drape the lower slopes of the rim. The sulfate-rich sediment of the Burns fm lies unconformably over the Grasberg fm. Ca-sulfate veins were discovered in Grasberg fm sediments; the sulfates precipitated from aqueous fluids flowing upward through these materials. Opportunity investigated the chemistry and morphology of outcrops in the Matijevic fm that have Fe(sup 3+)-rich smectite detected by orbital signatures returned by CRISM on MRO. Matijevic fm also contains "boxwork" fractures with chemistry consistent with an Al-rich smectite and veins that appear to be rich in Ca-sulfate. More recently on Cape Tribulation, Opportunity has characterized two S-, Mg- and Mn-rich rich rocks overturned and fractured by the rover's wheels on Cook Haven. Those rocks have been dubbed "Pinnacle Island" and "Stuart Island" and will be referred to as the "Island" rocks. The objectives of this study are to characterize the Fe and Mn contents in the Cape York materials, including the two Island rocks, and to provide a model for Mn mobilization and precipitation. Detailed geochemistry of Endeavour rim rocks is presented in a companion paper. Geochemical trends and elemental associations were obtained from data returned by the Alpha Particle X-ray Spectrometer (APXS) on Opportunity. |
| File Size | 394066 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150002976 |
| Archival Resource Key | ark:/13960/t53f9rr5c |
| Language | English |
| Publisher Date | 2015-03-16 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Science And Exploration Fractionation Chemical Analysis Montmorillonite Outcrops Geochemistry Iron Breccia Mars Exploration Veins Petrology Planetary Geology Mars Craters Lithology Stratigraphy Mars Surface Nickel Sulfur Oxidation-reduction Reactions X Ray Spectrometers Manganese Mars Roving Vehicles Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
