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Putinga meteorite, Linha Rui Barbosa, Putinga, Rio Grande do Sul, Brazil

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Latitude & Longitude (WGS84): 29° 0' South , 52° 10' West
Latitude & Longitude (decimal): -29.00000,-52.16667
Non-native locality type:Meteorite
Meteorite Class:L6 chondrite meteorite
Meteoritical Society Class: L6
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Cfa : Humid subtropical climate
Name(s) in local language(s):, Rio Grande do Sul, Sul, Brasil


Ordinary chondrite (L6; S3)
Fall, 16 August 1937; 300 kg
Main mass found at Linha Rui Barbosa (Putinga municipality), 2 km from Putinga city center, but other masses were spread over Anta Gorda, Arvorezinha, Ilópolis, São José do Herval and Encantado municipalities.

A day after an afternoon bolide had been observed, several large and moderate-sized stones were recovered ~ 2 km from Putinga. The two largest stones, 57 and 45 kg, were recovered from depths of 2-3 meters. Other stones were recovered in the following weeks and months. The roughly polyhedral 45 kg stone — investigated by several parties — is partially covered by a black fusion crust and occasional regmaglypts. Investigations reveal a stone with poorly defined chondrules within the light gray interior. Chondrules of various textures usually range in size from 0.2—4 mm in apparent size (mean diameter ~ 0.8 mm) within a fine-grained matrix with ~0.15 diameter crystals and fragments. Well-equilibrated, often poikilitically intergrown olivine (Fa~25) and orthopyroxene (Fa21) are dominant within both chondrules and matrix. Lesser amounts of shock-produced maskelynite of oligoclase composition is present as well. Fe-Ni metal (mostly kamacite) is prominent while troilite is found in lesser amounts as isolated grains or as monomineralic aggregates. Accessory chromite and merrillite are found only as quite minor constituents. Bulk iron contents (Fe ~22.5 wt%), textures, and the well-equilibrated olivine (Fa24) and orthopyroxene (Fs21.2) are consistent with the meteorite's L6 classification. Several shock features— mineralogically most evident in the presence of plessite and the complete or nearly complete conversion of plagioclase to maskelynite in some regions — are indicative of S3 or even higher shock levels. While limonite staining is apparent on the surface and ferric compounds are revealed by Mössbauer spectroscopy, weathering does not appear to have altered interior Fe-Ni metal to a significant degree.

The L (relatively low in total iron) chondrites represent ~40% of all properly classified and witnessed falls with the L6 type accounting for ~ 70% of these falls. Putinga is the 2nd most massive of the 271 meteorite falls classified exactly as an L6 chondrite (as of June 2016). The 45 kg mass has been stored at the Museu Luis Englert, Universidade do Rio Grande do Sul in Porto Alegre. Other smaller masses are reported, but the specimens listed at the Catalogue of Meteorites (2000) and in several earlier listings provide only an incomplete inventory of the original recovered mass.


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5 valid minerals.

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References

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Mason, B. (1967) Olivine Composition in Chondrites—a supplement: Geochimica et Cosmochimica Acta 31:1100-1103.
Symes, R.F. & Hutchison, R. (1970) Medanitos and Putinga, two South American meteorites. Mineral. Mag. 37 (290):721-735. (June 1970).
Keil, K., Lange, D., Ulbrich, M. N. C., Gomes, C. B., Jarosewich, E., Roisenberg, A., & Souza, M.J. (1978) XIII - Mineralogy, petrology, and chemistry of the Putinga, Rio Grande do Sul, chondrite: Meteoritics 13:165-175. (June 1978).
Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. pp. 162.
Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
de Oliveira, J.C.P., da Costa Jr., M.I., Vasquez, A., Roisenberg, A. & Vieira Jr., N. (1988) Moessbauer study of the Putinga chondrite: Physica Scripta 37(1): 185-187. (Jan. 1988).
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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