Carbo meteorite, Mun. de Pitiquito, Sonora, Mexico
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|Latitude & Longitude (WGS84):||29° 40' North , 111° 30' West|
|Latitude & Longitude (decimal):||29.66667,-111.50000|
|Other regions containing this locality:||Sonoran Desert, North America|
|Non-native locality type:||Meteorite|
|Meteorite Class:||IID iron meteorite|
|Meteoritical Society Class:||Iron, IID|
|Metbull:||View entry in Meteoritical Bulletin Database|
|Köppen climate type:||BWh : Hot deserts climate|
Iron meteorite, Octahedrite (IID, Om)
Find, 1923; 454 kg, the most massive IID iron
A large mass of Fe-Ni metal (~10% Ni) was found by cowboys on the Alamo ranch northwest of Hermosillo. In 1928 Harvard purchased the meteorite and over the years several sections have been available for study. For an iron meteorite the mineralogy is somewhat nondescript. Underneath a residual limonitic fusion crust kamacite with Neumann bands and decorated boundaries is somewhat dominant. Taenite and plessite (~40 vol%) account for most of the remaining mass. Minor schreibersite in several morphologies and even less abundant troilite are also present. However, other reduces phases frequently found in irons are either sparse or missing. Oxides include both preterrestrial phases (chromite, cristobalite) as well as terrestrial weathering products (hibbingite and the limonitic crust). Carbo's relatively long exposure age (~ 700 Ma) suggests a long time as part of a very small meteoroid before its eventual collision with the earth,
Carbo is the most massive of the small group of IID irons (22 members) which account for ~2% of all recovered irons.
9 valid minerals.
Meteorite/Rock Types Recorded
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Marvin, U. B. (1962) Cristobalite in the Carbo Iron Meteorite: Nature 196: 634-636. (Nov 1962)
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Buchwald, V. F. & Koch, C. B. (1995) Hibbingite (Beta-Fe2(OH)3Cl), a Chlorine-rich Corrosion Product in Meteorites and Ancient Iron Objects: Meteoritics, vol. 30, no. 5, page 493. (Sept 1995)
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.
Wasson, J.T., Huber, H., 2006. Compositional trends among IID irons; their possible formation from the P-rich lower magma in a two-layer core. Geochim. Cosmochim. Acta 70, 6153–6167.
Ammon, K., Masarik, J. & Leya, I. (2008) Noble gases in Grant and Carbo and the influence of S- and P-rich mineral inclusions on the 41K-40K dating system: Meteoritics & Planetary Science 43 (4): 685-699. (April 2008)
Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.