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Hydrothermal Alteration at Lonar Crater, India and Elemental Variations in Impact Crater ClaysThe role of hydrothermal alteration and chemical transport involving impact craters could have occurred on Mars, the poles of Mercury and the Moon, and other small bodies. We are studying terrestrial craters of various sizes in different environments to better understand aqueous alteration and chemical transport processes. The Lonar crater in India (1.8 km diameter) is particularly interesting being the only impact crater in basalt. In January of 2004, during fieldwork in the ejecta blanket around the rim of the Lonar crater we discovered alteration zones not previously described at this crater. The alteration of the ejecta blanket could represent evidence of localized hydrothermal activity. Such activity is consistent with the presence of large amounts of impact melt in the ejecta blanket. Map of one area on the north rim of the crater containing highly altered zones at least 3 m deep is shown.
Document ID
20050172168
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Newsom, H. E. (New Mexico Univ. Albuquerque, NM, United States)
Nelson, M. J. (New Mexico Univ. Albuquerque, NM, United States)
Shearer, C. K. (New Mexico Univ. Albuquerque, NM, United States)
Misra, S. (Indian Inst. of Tech. Kharagpur, India)
Narasimham, V. (Indian Inst. of Tech. Kharagpur, India)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Publication Information
Publication: Lunar and Planetary Science XXXVI, Part 14
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-11496
Distribution Limits
Public
Copyright
Public Use Permitted.

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