The Campos Sales Chondrite: A New Fall from Ceara State, Brazil

Details The Campos Sales Chondrite: A New Fall from Ceara State, Brazil The Campos Sales Chondrite: A New Fall from Ceara State, Brazil

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30q.591v&link_type=abstract

Meteoritics, vol. 30, no. 5, page 591

Computer Science

Sound

Chondrites, L, Classification, Falls, Meteorites

Scientific paper

The Campos Sales meteorite shower fell at 10:00 PM (local time) on January 31, 1991 and was observed by many local inhabitants. The fall was accompanied by a loud sound and bright flash, causing astonishment among the witnesses. The site of the fall is a grain field near the small town of Campos Sales situated in the southwest of the state of Cear , Brazil (7 02' S, 40 10' W). The total weight of the recovered material is estimated to be 23.68 Kg. Thirty-five crust-covered pieces, weighing 21.30 Kg total, ranged from 3g to 3.49 Kg each, and 300 smaller fragments totalled 2.38 Kg. Preliminary mineralogical and microprobe studies indicate that Campos Sales is a lightly shocked L chondrite with many chondrules dispersed in mineral debris. The olivine is Fa 25.0 and orthopyroxene is Fs 21.4 Wo 1.6. Neumann bands in the kamacite (6.2 - 6.5% Ni and 0.4 - 0.7% Co) and cracks in the olivine are the main shock features. Clear and cloudy taenite, plessite and monocrystalline troilite are also present. The available analyses are still insufficient to allow for a precise definition of the degree of equilibration. Thus, a petrological classification of types L4 or L5 is suggested. More detailed analyses are in progress and will be published elsewhere.

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