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Shock metamorphic effects in lunar microcratersDetailed petrographic descriptions and results of electron microprobe analyses are presented for impact glasses as well as shocked and unshocked minerals associated with individual lunar microcraters (diameters of 0.4 to 4.4 mm). Rocks of four typical lunar lithologies are studied: anorthosite, anorthositic norite, ophitic basalt, and polymict breccia. Textures, mineralogies, and chemical compositions are examined along a radial traverse through each microcrater; i.e., across the impact glasses lining the crater wall, the shock-metamorphosed zone immediately underlying the glass liner, and the unshocked host rock. The microcraters are discussed in a sequence of increasing mineralogical complexity of the host rock (from anorthosite to polymict breccia) in order to distinguish shock effects among mineral types. The shock metamorphic features observed are found to be comparable to those reported in shocked basalt from Lonar Crater, India, and are categorized into five shock-intensity classes with pressures experimentally calibrated.
Document ID
19770051864
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Schaal, R. B.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Hoerz, F.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Gibbons, R. V.
(NASA Johnson Space Center Houston, Tex., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 15, 1976
End Date: March 19, 1976
Accession Number
77A34716
Funding Number(s)
CONTRACT_GRANT: NSG-7052
CONTRACT_GRANT: NSR-09-051-001
Distribution Limits
Public
Copyright
Other

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