Phum Sambo meteorite, Kâmpóng Cham Province, Cambodia
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Latitude & Longitude (WGS84): | 12° 0' 0'' North , 105° 28' 59'' East |
---|---|
Latitude & Longitude (decimal): | 12, 105.483333333 |
Erratic type: | Meteorite |
Ordinary chondrite (H4; S1)
Fell, 9 Jan 1933, 16:30 hrs; 7.8 kg
A 7.8 kg mass and some small fragments were collected. Olivine and low Ca-pyroxene compositions (Fa18.6 & Fs16.5, resp.) are characteristic of the H-chondrite geochemical group. Mineralogically the meteorite consists primarily of dominant olivine, somewhat lesser amounts of low-Ca pyroxene) with minor amounts of Fe-Ni metal (mostly kamacite), troilite and plagioclase reported. Accessory chromite, ilmenite, and primary magnetite have also been reported. Shock indicators (level S1) are quite mild.
Phum Sambo literature has focused more on chronology than mineralogy. A 4.567 Ga I-Xe age places formation of the Phum Sambo original parent body (OPB) in the earliest epochs of Solar System history. Phum Sambo's 8.0 Ma cosmic ray exposure (CRE) age appears to be part of a peak in CRE ages for H-group chondrites — suggesting that the Phum Sambo meteoroid was involved in a major collision with other recent H chondrite falls.
The H (relatively high in total iron) chondrites are the second largest group of ordinary chondrite falls representing nearly 40% of the well-classified witnessed falls. The H4 petrologic type itself accounts for less than 20% of H-group chondrites. Currently, Phum Sambo is the 21st most massive meteorite fall classified exactly as an H4 chondrite (May 2017). [Ochansk, an 1887 Russian fall, is the most massive witnessed H4 fall.]
The main mass has been kept at the Museum National d'Histoire Naturelle (Paris) with smaller samples held elsewhere.
Mineral List
9 valid minerals.
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References
Mason, B. (1963) Olivine Composition in Chondrites: Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).
Müller, H.W. & Zähringer, J. (1979) Rare Gases in Stony Meteorites: IN: Meteoritic Research (Millman, P.M.-ed.) Springer-Verlag.
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.
Graf, Th. & Marti K. (1995) Collisional history of H chondrites. J. Geophys. Res. (Planets) 100: 21247–21263. (Oct 1995).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Robert Hutchinson (2004) Meteorites: A Petrologic, Chemical and Isotopic Synthesis. Cambridge University Press: Cambridge, New York, Melbourne, Cape Town, Madrid, São Paolo. 506 pages.
Kessel, R. (2002). The activity of chromite in multicomponent spinels: An experimental study with implications for the metamorphic history of equilibrated ordinary chondrites (Thesis). California Institute of Technology: Pasadena, California. 219 pages.
Kessel, R., Beckett, J.R. & Stolper, E.M. (2007) The thermal history of equilibrated ordinary chondrites and the relationship between textural maturity and temperature: Geochimica et Cosmochimica Acta 71(7):1855-1881. (April 2007).
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
Müller, H.W. & Zähringer, J. (1979) Rare Gases in Stony Meteorites: IN: Meteoritic Research (Millman, P.M.-ed.) Springer-Verlag.
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.
Graf, Th. & Marti K. (1995) Collisional history of H chondrites. J. Geophys. Res. (Planets) 100: 21247–21263. (Oct 1995).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Robert Hutchinson (2004) Meteorites: A Petrologic, Chemical and Isotopic Synthesis. Cambridge University Press: Cambridge, New York, Melbourne, Cape Town, Madrid, São Paolo. 506 pages.
Kessel, R. (2002). The activity of chromite in multicomponent spinels: An experimental study with implications for the metamorphic history of equilibrated ordinary chondrites (Thesis). California Institute of Technology: Pasadena, California. 219 pages.
Kessel, R., Beckett, J.R. & Stolper, E.M. (2007) The thermal history of equilibrated ordinary chondrites and the relationship between textural maturity and temperature: Geochimica et Cosmochimica Acta 71(7):1855-1881. (April 2007).
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=18811 -Phum Sambo@MetBullDatabase
http://webapp1.dlib.indiana.edu/virtual_disk_library/index.cgi/1185879/FID904/ABSTRCTS/501-END/2047.pdf -Phum Sambo xenology (I-Xe ages).
http://www.lpi.usra.edu/meteor/metbull.php?code=18811 -Phum Sambo@MetBullDatabase
http://webapp1.dlib.indiana.edu/virtual_disk_library/index.cgi/1185879/FID904/ABSTRCTS/501-END/2047.pdf -Phum Sambo xenology (I-Xe ages).