Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p12d0526t&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P12D-0526
Other
5420 Impact Phenomena (Includes Cratering), 5464 Remote Sensing, 5470 Surface Materials And Properties, 5475 Tectonics (8149), 5480 Volcanism (8450)
Scientific paper
Mare deposits play an important role to understand the origin of magma sources, resulting evolution of lunar secondary crust, and the relationship between volcanic eruptions and impact structures. In South Pole-Aitken (SPA) basin, more than 50 well-discrete mare ponds exist. In order to clarify the relationship between impact tectonic and post-impact volcanic activities, we investigate the distribution and compositional variation of mare ponds in SPA. The areal coverage of mare ponds indicates the highest areal ratio in central region and small peaks near ring regions, as observed in Orientale basin. It suggests that the structure of the basin is related to the initiation of volcanic eruptions. For the compositional analysis, FeO and TiO2 contents of mare materials of 43 mare ponds in SPA are estimated using Clementine UV/VIS images. The average of FeO contents of relatively large 14 mare ponds is 15.5 % in weight, which is within the range of typical samples of mare basalts. It is 4.5 % higher than the analysis of Yingst and Head (1999). The discrepancy may be originated from differences in estimation methods or investigated sites. The average value of TiO2 contents of our analysis is 3.5 %. All of the mare deposits in SPA are classified in Low-Ti basalts type, even though mare deposits of High-Ti basalts exist outside SPA basin, such as, mare Moscovience. The gradual increases in FeO and TiO2 contents are also recognized as a function of radial distance from SPA center. The variance of contents may be related to the subsurface structure of impact basin, since the content of TiO2 represents the depth of the magma source. In SPA region, most of crustal materials are excavated, and lower crust or upper mantle is exposed. The layer of the source of Hi-Ti basalts may be heavily brecciated, mixed with crustal materials, isositatically rebounded, and less-pressurized, after the impact. Then, magma chambers of High-Ti basaltic source may not be developed. Another interpretation is that the variation may be due to the degree of the mixing of highland materials and it may represent the duration of the exposure to the space. Thus, the variation of FeO and TiO2 contents may reflect the relationship between the sub-surface structure of impact basin and the location or the time of the development of magma sources.
Hori Sadaki
Takata Tadafumi
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