Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p53b1449b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P53B-1449
Mathematics
Logic
6008 Composition (1060), 6017 Erosion And Weathering, 6055 Surfaces, 6207 Comparative Planetology, 6225 Mars
Scientific paper
The phyllosian period of Mars displays rocks that are altered at different levels, containing phyllosilicates of various nature, revealing that liquid water played a strong role in their formation. However, debates currently exist to know if this alteration was conduced at the surface due to a different climate, or in the subsurface from hydrothermal circulation. Here, we display results in the Tyrrhena Terra region, which is of interest to address this issue. Indeed, Tyrrhena Terra is located in cratered Noachian highlands in the southern hemisphere, south of Isidia Planitia and north of Hellas basin. This region displays highland terrains partially dissected by fluvial valleys and several intercrater plains. Phyllosilicates are identified by the combination of 1.9 and 2.3 micron features in the OMEGA imaging spectrometer data. They are frequently located on craters ejecta and pieces of outcrops close to the highlands. Olivine and pyroxenes are also identified, and are associated mainly to the intercrater plains when present together. We focus our interest on regions where a single 1.9 micron signature is observed (with small 2.3 micron features observed locally), and where pyroxene is found in the same area. This detection suggests a partial alteration or a spatial mixing with unaltered material as highlighted by the presence of pyroxene signatures at the same location. The geologic study of these areas of interest shows that these hydrous minerals are located at the foothills of highlands, especially in locations where valley networks end in plains. This leads to the conclusion that these hydrous minerals are observed in alluvial plains collecting material from the highlands. This example shows that external cycles of running water are involved in alteration minerals deposition. We currently study these regions in details to know if the alteration was a result of this process during sedimentation (alteration coeval to fluvial activity), or if the alteration occurred earlier in the crust with later erosion and transport into the alluvial plains (without relation with fluvial episodes).
Ansan Véronique
Bibring J.
Bouley Sylvain
Langevin Yves
Le Mouélic Stéphane
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