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Ipiranga meteorite, Lajeado Ipiranga, São Miguel do Iguaçu, Paraná, Brazil

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Latitude & Longitude (WGS84): 25° 30' South , 54° 30' West
Latitude & Longitude (decimal): -25.5, -54.5


Ordinary chondrite, regolith breccia (H6; S3)
Fall, 27 December 1972; 7 kg, small shower

Seen as far as 300 km from the fall site by an airplane pilot a westwardly moving fireball appeared in a cloudless sky, detonations and rapid gunfire-like sounds were heard, houses were shaken, cups tinkled, and a number of meteoritic stones fell at Lajeado Ipiranga. A trail of smoke lingered for well over 15 minutes and over the following weeks ~30 small fragments and a single 2.65 kg mass were recovered over an ~40 km long strewn field. The largest piece was recovered from a 45 cm wide, 25 cm deep pit. Within the meteorite chondrules are quite evident (0.2-2.0 mm) and are integrated into the normally very well equilibrated matrix dominated by olivine and orthopyroxene. Minor amounts of plagioclase, troilite, and often plessitic Fe-Ni metal are also observed. Even smaller amounts of accessory apatite, chromite, and pentlandite have been reported from some specimens. Compositionally, bulk iron contents (26.27 wt%) and the uniform olivine (Fa19) and low Ca-orthopyroxene (Fs16.1) are characteristic of well equilibrated H6 chondrites. This overall chemical and mineralogical account is complicated, however, by evidence of extensive shock in some regions — shock veins, turbid glass in some chondrules, undulose extinction, twinning, and melt pockets.

The H (relatively high in total iron) chondrites are the 2nd largest geochemical group of ordinary chondrites and represent ~35% of all properly classified and witnessed falls. The H6 petrologic type subgroup account for ~25 % of the total H chondrite group. Ipiranga is one 94 meteorite falls classified exactly as an H6 chondrite and the only one from Brazil (June 2016). For several decades masses of 3.2 kg and 2.6 kg have been curated by the Museo di Mineralogia (Rome) and the Observatório Astronômico (Curbita).

Mineral List


7 valid minerals.

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References

Clarke Jr, R.S. (1974). The Meteoritical Bulletin, No. 52. Meteoritics 9 (1): 101-124. (March 1974).
Cavarretta, G., Fornaseri, M., Funiciello, R. & Tolomeo, L. (1975) The chondritic shower of Lajeado Ipiranga, Paraná, Brazil: Meteoritics 10(4): p. 380. (Dec 1975).

Gomes, C.B., Ruberti, E., Jarosewich, E. & Silva, J.M.L.U. (1978) Studies of Brazilian meteorites XVI: Mineralogy, petrology and chemistry of the Ipiranga, Paraná, chondrite. Chemie der Erde: Beitrage zur chemischen Mineralogie, Petrographie und Geologie. 37:265-270.

Clarke Jr, R.S. & Scott, E.R.D. (1980) Tetrataenite—ordered FeNi, a new mineral in meteorites. American Mineralogist 65(7-8): 624-639. (Jul-Aug 1980).

Gomes, C.B. & Keil, K. (1980) Brazilian Stony Meteorites: University of New Mexico Press: Albuquerque. 162 pages.

Graham, A.L., Bevan, A.W.R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.

Crozaz G., Pellas, P., Bourot-Denise, M., de Chazal, S.M., Fieni, C., Lundberg, L.L. & Zinner, E. (1989) Plutonium, uranium and rare earths in the phosphates of ordinary chondrites—the quest for a chronometer: Earth and Planetary Science Letters 93: 157-169.

Stöffler, D., Keil, K. & Scott, E.R.D. (1991). Shock metamorphism of ordinary chondrites. Geochimica et Cosmochimica Acta 55: 3845-3867. (Sept 1991).

Graf, T. & Marti, K. (1995) Collisional History of H Chondrites: Journal of Geophysical Research 100 (E10): 247-263. (Oct 1995).

Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Dunn, T.L., Cressy, G., McSween Jr, H.Y. & McCoy, T.J. (2010) Analysis of ordinary chondrites using powder X-ray diffraction: 1. Modal mineral abundances. Meteoritics & Planetary Science 45(1):123-134. (Jan 2010).
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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