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Lunar Impact Basins and Crustal Heterogeneity: New Western Limb and Far Side Data from Galileo

Belton, Michael J. S. and Head, James W., III and Pieters, Carle M. and Greeley, Ronald and McEwen, Alfred S. and Neukum, Gerhard and Klaasen, Kenneth P. and Anger, Clifford D. and Carr, Michael H. and Chapman, Clark R. and Davies, Merton E. and Fanale, Fraser P. and Gierasch, Peter J. and Greenberg, Richard and Ingersoll, Andrew P. and Johnson, Torrence and Paczkowski, Brian and Pilcher, Carl B. and Veverka, Joseph (1992) Lunar Impact Basins and Crustal Heterogeneity: New Western Limb and Far Side Data from Galileo. Science, 255 (5044). pp. 570-576. ISSN 0036-8075. doi:10.1126/science.255.5044.570.

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Multispectral images of the lunar western limb and far side obtained from Galileo reveal the compositional nature of several prominent lunar features and provide new information on lunar evolution. The data reveal that the ejecta from the Orientale impact basin (900 kilometers in diameter) lying outside the Cordillera Mountains was excavated from the crust, not the mantle, and covers pre-Orientale terrain that consisted of both highland materials and relatively large expanses of ancient mare basalts. The inside of the far side South Pole-Aitken basin (>2000 kilometers in diameter) has low albedo, red color, and a relatively high abundance of iron- and magnesium-rich materials. These features suggest that the impact may have penetrated into the deep crust or lunar mantle or that the basin contains ancient mare basalts that were later covered by highlands ejecta.

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Head, James W., III0000-0003-2013-560X
Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1992 American Association for the Advancement of Science. 30 August 1991; accepted 11 December 1991. We thank the Galileo Project Office, the National Aeronautics and Space Administration, and numerous individuals who participated in the mission planning and initial data analysis for help and support including T. Becker, L. Bolef, H. Breneman, E. Dejong, E. Fischer, L. Gaddis, P. Helfenstein, H. Hoffmann, R. Jaumann, J. Moersch, S. Murchie, J. Oberst, J. Plutchak, M. Robinson, D. Rudy, R. Sullivan, J. Sunshine, L. Wainio, and D. Williams. Helpful comments on earlier drafts of this manuscript were provided by P. Pinet, S. Murchie, J. Sunshine, E. Fischer, and an anonymous reviewer.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Issue or Number:5044
Record Number:CaltechAUTHORS:20130510-152958369
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38434
Deposited By: Ruth Sustaita
Deposited On:10 May 2013 22:49
Last Modified:09 Nov 2021 23:37

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