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The Campos Sales meteorite from Brazil: A lightly shocked L5 chondrite fall
Author(s) -
SCORZELLI R. B.,
MICHELLÉVY M. CHRISTOPHE,
GILABERT E.,
LAVIELLE B.,
AZEVEDO I. SOUZA,
VIEIRA V. W.,
COSTA T. V. V.,
ARAÚJO M. A. B.
Publication year - 1998
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.1945-5100.1998.tb01317.x
Subject(s) - chondrite , meteorite , ordinary chondrite , kamacite , geology , cosmic ray , meteoroid , astrophysics , mineralogy , astrobiology , physics
— The Campos Sales meteorite fell close to the town of Campos Sales in the northeastern Brazilian state of Ceará (7°2′ S, 40°10′ W) on 1991 January 31 at 10:00 P.M. (local time). Several fragments were recovered from an area estimated to be 1 × 3 km. The stone is an ordinary L5 chondrite (Fa 25.0 and FS 21.6 ) and is lightly shocked (S1). Metal phases present are kamacite, tetrataenite, and antitaenite. Noble gases He, Ne, Ar, Kr, and Xe have been analyzed in two bulk samples of Campos Sales. All exposure ages based on determination of cosmogenic 3 He, 21 Ne, 38 Ar, 83 Kr, and 126 Xe abundances and on the cosmogenic 81 Kr/ 83 Kr ratio agree well, which suggests no gas loss during cosmic‐ray exposure. The cosmic‐ray exposure age is 23.3 ± 1.0 Ma, which falls in the range observed for L5 chondrites (20–30 Ma). The gas‐retention ages indicate He loss that must have occurred prior to or during ejection from the L‐chondrite parent body.