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Bholghati meteorite, Deoli pargana, Maurbhanj district, Odisha (Orissa), India

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Latitude & Longitude (WGS84): 22° 4' 59'' North , 86° 53' 59'' East
Latitude & Longitude (decimal): 22.0833333333, 86.9
Other regions containing this locality:Asia


Fall, 29 Oct 1905; 2.5 kg, 2 stones
Howardite with eucritic, diogenitic and carbonaceous clasts

After detonations, two stones fell only 500 meters apart at the village of Bholghati. Like all Howardites, Bholghati is a breccia composed primarily of eucritic and diogenitic fragments which were incompletely mixed by impacts and metamorphism subsequent to their original formation ~4.5 billion years ago on their ancient homeworld. Highly variable, but anorthite-rich eucritic components account for just over half of Bholghati's bulk while orthopyroxene-rich diogenitic material accounts for most of the rest. Minute monomineralic fragments abound, but larger single mineral clasts and multi-mineral aggregates are found as well. While most larger clasts are readily recognized as eucrite and diogenite fragments, a few carbonaceous chondrite-like fragments are also present. Indeed, the carbonaceous material accounts for ~ 3% of the meteorite - including clasts rich in CM and CR2 material. Minor silicates and opaques found in most HED meteorites are found, but the meteorite's total mineralogical inventory is further enriched by the addition of phyllosilicates, Ni-bearing sulfides, and other low temperature phases found in the carbonaceous clasts. Very small amounts of Fe-rich metal are found - some is ordinary meteoritic Fe-Ni metal (mostly kamacite), but Ni-poor iron is also reported.

As is true of most igneously derived meteorites in the Howardite-Eucrite-Diogenite clan (HED meteorites) most of the Bholgati eucritic and matrix material crystallized ~4.5 billion yeas ago. However, K-Ar ages and disturbed Rb-Sr patterns indicate subsequent important event(s) occurring < three billion yeas ago [presumably impact(s)]. At some point, a moderately small asteroidal fragment was launched into space. Cosmic ray ages suggest that sometime in the past ~20 million years or so Bholghati became part of an even smaller meteoroid with an orbit designed for an impact with earth. Oxygen isotope systematics and Fe-Mn ratios indicate that Bholgati is one of the many 'normal' HED meteorites apparently derived from a single parent body. At the present time Vesta appears to have been that parent body. [A few meteorites (e.g., Ibitira, Pasamonte) are apparent HED 'look-a-likes' from a separate parent body, but Bholgati is not one of them.]

Bholgati photos available at the Meteoritical Bulletin Database provide a nice visual match for the mineralogy and geochemistry summarized here. Most areas are dominated by milky white plagioclase accompanied by translucent pyroxenes. The various clasts of different colors and sizes include a few greenish pyroxenites and smaller, much darker carbonaceous clasts.

Mineral List


16 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Mason B., Jarosewich, E. & Nelen, J. A. (1979) The pyroxene-plagioclase achondrites. Smithson. Contrib. Earth Sci. 22: 27-45.

Hewins, R. H. (1979) The composition and origin of metal in howardites: Geochimica et Cosmochimica Acta 43: 1663-1673. (Oct 1979)

Delaney, J. S., Nehru, C. E. & Prinz M. (1980) Olivine Clasts from mesosiderites and howardites: Clues to the nature of achondritic parent bodies. Lunar Planetary Science Conference XI: 1037-1087.

Fuhrman, M. & Papike, J. J. (1981) Howardites: Samples of the Regolith of the Eucrite Parent-Body Petrology of Bholgati, Bununu, and Kapoeta (abstract). Lunar and Planetary Science XII: 309-311. (March 1981)

Fuhrman, M. & Papike, J. J. (1982) Howardites and polymict eucrites: Regolith samples from the eucrite parent body - Petrology of Bholgati, Bununu, Kapoeta, and ALHA 76005. Lunar and Planetary Science Conference XIII: 1257-1279. (March 1982)

Mayeda, T. K. & Clayton, R. N. (1989) Oxygen Isotopes in the Bholghati Howardite (abstract): Lunar and Planetary Science Conference XX: 648. (March 1989)

Reid, A. M., Buchanan, P. C., Zolensky, M. E., Nicols, R. H. & Barrett, R. A. (1990) The Bholgati Howardite: Petrography and mineral chemistry. G&CA 54 (8): 2161-2166. (Aug 1990)

Buchanan, P. C., Zolensky, M. E. & Reid, A. M. (1993) Carbonaceous Chondrite clasts in the howardites Bholghati and EET87513: Meteoritics 28 (5): 659-668. (Dec 1993).

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

External Links

http://www.lpi.usra.edu/meteor/metbull.php = Meteoritical Bulletin Database

 
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