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A NEW LL3 CHONDRITE, ALLAN HILLS A79003, AND OBSERVATIONS ON MATRICES IN ORDINARY CHONDRITES
Author(s) -
Scott Edward R.D.,
Taylor G. Jeffrey,
Maggiore Peter
Publication year - 1982
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1982.tb00557.x
Subject(s) - chondrule , chondrite , meteorite , ordinary chondrite , troilite , opacity , kamacite , silicate , geology , matrix (chemical analysis) , geochemistry , mineralogy , astrobiology , chemistry , materials science , physics , composite material , organic chemistry , optics
Allan Hills A79003 is an LL3 chondrite with a petrologic subtype of 3.4 ± 0.2. Contrary to previous suggestions, it is not paired with other Allan Hills specimens. It contains haxonite, (Fe, Ni) 23 C 6 ; shock‐melted, ‘fizzed’ metal‐troilite intergrowths; and translucent, glassy‐looking Huss matrix (fine‐grained, Fe‐rich silicate matrix), in addition to the normal opaque and recrystallized varieties of Huss matrix. Some chondrules are partly coated with opaque matrix, others with translucent matrix. Translucent matrix is more uniform in composition and contains less S, CaO and FeO and more MgO than the opaque variety. Both kinds of matrix rimmed chondrules before consolidation of the meteorite.