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Country: USA
State/District: Arizona, Pima Co.
Co-ordinates: 31°51'N, 110°58'W
Date of find: 1850, (before)
Total known weight: 975kg
Number of pieces: 2
Classification:
Type: Ungrouped iron, ataxite, Ni-rich with silicate inclusions
Shock Stage:
Weathering Stage:
Mineral Analyses: Pyroxene Fs 0.4
Pairings: not known
Synonyms: Ainsa Iron, Arizona, Bartlett Meteorite, Cañada de Hierro, Carleton Iron, Irwin, Irwin-Ainsa Iron, Muchachos, Ring Meteorite, Santa Catarina Mountains, Santa Rita, Signet, Iron, Sonora, Taos, Tuscon
Metbase description: Show/Hide
Two large masses, one ring-shaped (the Signet or Irwin-Ainsa Iron) of 688kg and the other (the Carleton Iron) of 287kg known for centuries, had been transported to Tucson from the Puerta de los Muchacos, a pass 20-30 miles S of that town and were used as anvils; first mentioned by J.F.Velasco in 1850, M.H.Hey, Cat. Met., 1966, p.491. Bibliography, with analyses, L.Fletcher, Min. Mag., 1890, 9, p.16. Bibliography for the period 1850-1876, P.J.McGough, Pop. Astron., Northfield, Minnesota, 1943, 51, p.511, 564, and 1944, 52, p.243. Detailed history, with bibliography, R.R.Willey, The Tucson Meteorites, Washington D.C., 1986, 56 pp. A unique iron with silicate inclusions, containing brezinaite, (Cr3S4), T.E.Bunch and L.H.Fuchs, Amer. Miner., 1969, 54, p.1509. Analysis, 9.45% Ni, 0.94 ppm Ga, 0.049 ppm Ge, 2.1 ppm Ir, orthopyroxene Fs0.4 in silicate inclusions, J.T.Wasson, GCA, 1970, 34, p.957. The Carleton mass has been heated and forged; different coordinates, weights of masses, V.F.Buchwald, Handbook of Iron Meteorites, Univ. of California, 1975, p.1235. Further chemical analysis, 9.82% Ni, 0.54% Co, M.I.Dyakonova and V.Y.Kharitonova, Meteoritika, 1975, 34, p.65. Microstructure and cooling rate calculation, the meteorite was rapidly cooled, G.T.Miyake and J.I.Goldstein, GCA, 1974, 38, p.1201. Further analysis, E.R.D.Scott, GCA, 1978, 42, p.1243. Relationship to enstatite meteorites; mineralogy and chemical composition of silicate inclusions, C.E.Nehru et al., J. Geophys. Res., 1982, 87, (suppl.), p.A365. Further analysis data of metallic and non-metallic phase, H.Wänke et al., Meteoritics, 1983, 18, p.416 (abs.). Synonyms, references, A.L.Graham et al., Cat. Met., 1985, p.353. Relationship of silicates to components in Renazzo, Bencubbin, and Kakangari meteorites, M.Prinz et al., LPSC, 1987, 18, p.800 (abs.). Ag-Pd isotopic composition, J.H.Chen and G.J.Wasserburg, LPSC, 1990, 21, p.184 (abs.). Nitrogen isotopic composition, C.A.Prombo and R.N.Clayton, GCA, 1993, 57, p.3749. Oxygen isotopic composition, R.N.Clayton and T.K.Mayeda, GCA, 1996, 60, p.1999.
The meteorite was data copied from MetBase 7.1 for Windows.
For information about this software please contact the Author: Joern Koblitz, The MetBase Library of Meteoritics and Planetary Sciences, Benquestrasse 27, D-28209 Bremen, Germany
Phone: +49 421 24 100 24 Fax: +49 421 24 100 99
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