The Campos Sales Brazil meteorite: A lightly shocked L5 chondrite fall

Details The Campos Sales Brazil meteorite: A lightly shocked L5 chondrite fall The Campos Sales Brazil meteorite: A lightly shocked L5 chondrite fall

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33.1335s&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 6, pp. 1335-1337.

Physics

4

Scientific paper

The Campos Sales meteorite fell close to the town of Campos Sales, in the northeastern Brazilian state of Ceara (72' deg S; 4010' deg W), on 31 January 1991, at 10:00 PM (local time). Several fragments were recovered from an area estimated to be 3 km ? 1 km. The stone is an ordinary chondrite, L5 ( Fa25.0 and Fs21.6 ), lightly shocked, S1. Metal phases present are kamacite, tetrataenite and antitaenite. Noble gases He, Ne, Ar, Kr and Xe have been analyzed in 2 bulk samples of Campos Sales. All exposure ages based on determination of cosmogenic 3He, 21Ne, 38Ar, 83Kr, 126Xe abundances and on cosmogenic 81Kr/83Kr ratio agree well, suggesting 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.

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