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The Richfield LL3 chondrite
Author(s) -
RUBIN Alan E.,
BENOIT Paul,
REED Blaine,
EUGSTER Otto,
POLNAU Ernst
Publication year - 1996
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.1996.tb02125.x
Subject(s) - breccia , chondrite , geology , clastic rock , parent body , geochemistry , chondrule , silicate , carbonaceous chondrite , mineralogy , meteorite , astrobiology , chemistry , sedimentary rock , physics , organic chemistry
— Richfield is a moderately shocked (shock stage S4) LL3.7 genomict breccia find consisting mainly of light‐colored recrystallized clasts and dark clasts exhibiting significant silicate darkening; a few impact‐melt‐rock clasts and LL5 chondrite clasts also occur. The cosmic‐ray exposure age of 14.5 Ma is indistinguishable from the main exposure peak for LL chondrites (15 Ma). Although the exposure ages indicate little He loss, the gas‐retention ages indicate high gas losses that must have occurred prior to or during ejection from the LL parent body.