Mathematics – Logic
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p23a0181b&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P23A-0181
Mathematics
Logic
5415 Erosion And Weathering, 5475 Tectonics (8149), 5480 Volcanism (6063, 8148, 8450), 6225 Mars
Scientific paper
Preliminary morphologic and chronologic studies of three spatially distinct regions along the Arabia Terra dichotomy boundary (Arabia Terra to Acidalia Planitia ~20N, 20W, Arabia Terra to Vastitas Borealis through Deuteronilus Mensae ~45N, 35E, and Arabia Terra to Vastitas Borealis north of Syrtis Major Planum ~40N, 70E) provide insight into post boundary formation processes, local burial, exhumation, and extensive denudation. Morphologically, the three study areas display a wide variety of post-boundary modification processes: outflow floods in the west, volcanism and tectonism in the east, and potential volatile deposition and glacial modification in the north. Preservation of these activities lies predominantly in localized linear depressions, which exhibit finely layered channel fill deposits, flood lavas, and lineated valley fill, respectively. Despite significant reworking of the surface by a variety of processes, crater-frequency plots reveal that the `highland terrains' outboard of the depressions display surface model ages that fall near or before the 3.5 Gy isochron, alluding that the crust beneath was in place across the region during the Noachian. Localized fill deposits display a variety of ages that span from the Noachian to the Amazonian. Additionally, each region displays a marked decline in the preservation of small craters (250m) suggesting significant denudation across the region. This investigation is focusing on the myriad of criss-crossing lineaments that dissect the Arabia Terra dichotomy boundary, their local morphology and origin, their temporal differences, and their orientations, all in attempt to reveal patterns of crustal structure potentially related to original dichotomy formation. Deciphering the multi-stage and multi-process geologic history remains one of several challenges in determining the origin and age of the crustal dichotomy boundary on Mars.
Berman Daniel C.
Bleamaster Leslie F.
Crown David A.
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