Mathematics – Logic
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0207h&link_type=abstract
American Astronomical Society, DPS meeting #41, #2.07
Mathematics
Logic
Scientific paper
The Orientale basin is the youngest and most well-preserved large basin on the Moon. Thus, analysis of Orientale permits us to assess: 1) the primary structure of fresh basin interiors including the nature and distribution of impact melts, and 2) the nature of the early stages of filling of basins with mare basalts. We have undertaken a joint analysis of Chandrayaan-1 Moon Mineralogy Mapper (M3) data (to assess the distribution and characterization of geologic units at high spatial and spectral resolution) and Terrain Mapping Camera (TMC) data for high-resolution images and digital terrain models of specific local areas. M3 data show that the Hevelius Formation (interpreted to be Orientale ejecta) and the Montes Rook Formation (a domical facies of uncertain origin) have many similarities and appear to be variations of basin ejecta. The Maunder Formation (MF) occurs within the Outer Rook Ring, lies stratigraphically below the maria, and is characterized by two facies: 1) a crenulated, cracked and corrugated facies draped over pre-existing topography, and 2) a smoother, bright plains deposit that occurs preferentially toward the middle of the basin and lies adjacent to and below Mare Orientale. M3 data confirm the impact melt origin of the MF; they show a distinctive diversity of rock types in the smooth facies, supporting the idea that there are significant unmelted inclusions here, as well as in the corrugated facies. Topography associated with the cooling of the MF support melt-sheet thicknesses in the range of hundreds of meters, not kilometers. Mare basalts embay the MF structure and thus postdate the cooling of the melt sheet; a diversity of specific vents have been located and correlated with units. M3 data for Orientale basin deposits, rings and superposed impact craters provide insight into crustal stratigraphy.
Boardman Joseph
Buratti Bonnie
Clark Rebecca
Combe J.
Goswami Jitendra N.
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