Sahara 99555 and D'Orbigny: Possible Pristine Parent Magma of Quenched AngritesAngrites constitute a small, but important group of basaltic achondrites showing unusual mineralogy and old crystallization ages. The currently known angrites are divided into two subgroups. Angra dos Reis (ADOR) and LEW86010 show slow cooling histories ("slowly-cooled" angrites) and differ from the later found angrites (LEW87051, Asuka 881371, Sahara 99555, D Orbigny, NWA1670, NWA1298). This second group has textures that suggest rapid cooling histories ("quenched" angrites). The petrogenesis of angrites has been controversial, partly due to the small number of available samples. In this abstract, we suggest a possible parent melt composition for the quenched angrites and its relationship to the partial melts of carbonaceous chondrites.
Document ID
20040062070
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Mikouchi, T. (Tokyo Univ. Japan)
McKay, G. A. (NASA Johnson Space Center Houston, TX, United States)
Jones, J. H. (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Achondrites: An Awesome Assortment