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Evidence for Impact-induced Hydrothermal Alteration at the Lonar Crater, India, and Mistastin Lake, CanadaThe 50,000 year old, 1.8km diameter Lonar crater is located in Maharashtra, India. This relatively small crater is of particular interest because of its unique morphological and mineralogical properties, which make it a valid analogue for similar craters on the surface of Mars. We show that even in this relatively small crater, substantial hydrothermal alteration of shocked breccias in the floor of the crater has occurred, probably due to the thermal effects of the impact event. The 38 my old, 28 km diameter, Mistastin crater contains an 80 m thick impact melt sheet. We have also documented the presence of alteration phases in the material from this larger crater.
Document ID
20030067110
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Newsom, H. E.
(New Mexico Univ. Albuquerque, NM, United States)
Hagerty, J. J.
(New Mexico Univ. Albuquerque, NM, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Third International Conference on Large Meteorite Impacts
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-8804
CONTRACT_GRANT: NAG5-10143
Distribution Limits
Public
Copyright
Other
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