Burdett meteorite, Pawnee Co., Kansas, USA
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Latitude & Longitude (WGS84): | 38° 13' 59'' North , 99° 31' 59'' West |
---|---|
Latitude & Longitude (decimal): | 38.23333,-99.53333 |
Non-native locality type: | Meteorite |
Köppen climate type: | Cfa : Humid subtropical climate |
Ordinary chondrite, veined (H5)
Find, 1940; 8.6 kg
A weathered meteoritic stone covered with a deep brown crust was recognized as a meteorite after having lain in a barnyard for ~17 years. Grayish brown, often indistinct chondrules and usually irregular grains of troilite and Fe-Ni metal are dispersed within a dark gray matrix. Olivine and orthopyroxene crystals (≤ 1 mm, ≤ 0.5 mm, resp.) occur as large subhedral grains and as granular matrix. Twinned orthopyroxene grains [inverted clinopyroxene] account for ~20 % of orthopyroxene. Smaller grains of diopsidic clinopyroxene are present as well as some unusually chromite-rich chondrules. Compositionally, bulk iron contents (26.42 wt% Fe), equilibrated olivine (Fa18), low Ca-orthopyroxene (Fs15.3), and moderately recrystallized matrix are characteristic of H5 chondrites. Overall mineralogy is characterized by dominant olivine and accompanying orthopyroxene along with minor plagioclase, Fe-Ni metal, and troilite. Accessory chromite and diopside plus smaller amounts of several opaques (copper, ilmenite, and isocubanite) are reported. A few tiny phosphate grains (merrillite [≤ 50 mm diameter] and lesser chlorapatite) have also been reported.
A U-He age of ~3.71 Ga is reported, possibly indicative of a major collision involving an intermediate parent body (IPB) subsequent to the original formation of a putative H-chondrite parent body.
Mineral List
10 valid minerals.
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References
Krinov, E. L. - Editor (1967) The Meteoritical Bulletin, no. 40: Moscow.
Ramdohr, P. (1967) Chromite and chromite chondrules in meteorites—I : Geochimica et Cosmochimica Acta 31(10): 1961-1967. (Oct 1967).
Taylor, G.J. (1968) On the Thermal History of Chondrites: Master's Thesis: Rice University. 73 pages.
Fodor, R.V., Keil, K., Jarosewich, E. & Huss, G.I. (1969). A mineralogical and chemical study of the Burdett, Kansas, chondrite: Meteoritics 4: 272. (Sept 1969).
Fodor, R.V., Keil, K., Jarosewich, E. & Huss, G.I. (1971) Mineralogy, petrology, and chemistry of the Burdett, Kansas, chondrite: Chemie der Erde : Beitrage zur chemischen Mineralogie, Petrographie und Geologie 30: 103-113.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Wasson, J. & Wang, S. (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions. Meteoritics 26(2): 161-167. (June 1991).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Ramdohr, P. (1967) Chromite and chromite chondrules in meteorites—I : Geochimica et Cosmochimica Acta 31(10): 1961-1967. (Oct 1967).
Taylor, G.J. (1968) On the Thermal History of Chondrites: Master's Thesis: Rice University. 73 pages.
Fodor, R.V., Keil, K., Jarosewich, E. & Huss, G.I. (1969). A mineralogical and chemical study of the Burdett, Kansas, chondrite: Meteoritics 4: 272. (Sept 1969).
Fodor, R.V., Keil, K., Jarosewich, E. & Huss, G.I. (1971) Mineralogy, petrology, and chemistry of the Burdett, Kansas, chondrite: Chemie der Erde : Beitrage zur chemischen Mineralogie, Petrographie und Geologie 30: 103-113.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Wasson, J. & Wang, S. (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions. Meteoritics 26(2): 161-167. (June 1991).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=5167 - Burdett@MetBullDatabase
http://www.encyclopedia-of-meteorites.com/test/Burdett_don_edwards.JPG — Burdett specimen
http://www.lpi.usra.edu/meteor/metbull.php?code=5167 - Burdett@MetBullDatabase
http://www.encyclopedia-of-meteorites.com/test/Burdett_don_edwards.JPG — Burdett specimen