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Semarkona meteorite, Madhya Pradesh, India

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Latitude & Longitude (WGS84): 22° 15' North , 79° 0' East
Latitude & Longitude (decimal): 22.25, 79
Non-native locality type:Meteorite
Other regions containing this locality:Deccan Traps, India


LL3.0, unusually primitive chondrite
Fall, 26 October 1940; 691 g


Of the 6000 plus stones listed as LL Chondrites (very low in Fe) at the 'Meteoritical Bulletin Database' only 5 are classified as LL3.0, the most primitive petrologic type possible for ordinary chondrites. The modest-sized Semarkona Chondrite is the largest of this select group. Such chondrites have abundant chondrules, minimal aqueous alteration, and unequilibrated mineralogical assemblages which were gathered together by low temperature nebular processes and subsequent mild metamorphism on the original homeworld. Studies of Fe-rich and Fe-poor chondrules, amoeboid olivine aggregates, carbide assemblages, and sulfide assemblages have revealed a plethora of minerals recording various aspects of Semarkona's complex formation. Among the mineralogical vestiges of its ancient past are various minute presolar grains (diamond, corundum, spinel) which continue to spark inquiry and interest.


Initial Refs.:
Hutchinson, R., Alexandra, C.M.O., and Barber, D.J. (1987) The Semarkona meteorite - First recorded occurrence of smectite in an ordinary chondrite, and its implications. Geochimica et CosmochimicaActa: 51 (July 1987): 1875-1882.

Fisenko, A.V. and L.F. Semenova (1997) On the Selection of Chondrites for Studying Interstellar Diamond. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences.

Mineral List


30 valid minerals.

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References

Taylor, G. J., Okada, A., Scott, E. R. D., Rubin, A. E., Huss, G. R. & Keil, K. (1981) The Occurrence and Implications of Carbide-Magnetite Assemblages in Unequilibrated Ordinary Chondrites (abstract). Lunar and PLanetary Science XII: 1076-1078. ( March 1981)

Grossman, J. N. (1985) Semarkona: The Least Metamorphosed Ordinary Chondrite. Meteoritics 20 (4): 656-657 (Dec 1985)

Hutchison, R., Alexander, C. M. O. & Barber, D. J. ( 1987) The Semarkona meteorite - First recorded occurrence of smectite in an ordinary chondrite, and its implications: Geochimica et Cosmochimica Acta 51: 1875-1882. (July 1987)

E.R.D. Scott et al. (1988) Primitive material surviving in chondrites: Matrix. IN: Meteorites and the Early Solar System. Kerridge, J. & Matthews, M.S. -Eds., pp. 718--745: University of Arizona Press: Tucson, Arizona.

Jones, R. H. (1990) Petrology and Petrology of Type II, FeO-rich chondrules in Semarkona (LL3.0). G&CA 54 (6), 1985-1802. (June 1990)

Bourot-Denise, M., Perron, C. & Zanda, B (1993) Compositional Heterogeneity in Metal Grains of Primitive Chondrites: Onset of Metamorphism. Meteoritics 28(3): 327. (July 1993).

Jones, R. H. (1994) Petrology of FeO-poor, porphyritic pyroxene chondrules in the Semarkona chondrite Geochimica et Cosmochimica Acta 58 (23), 5325-5340. (Dec 1994).

Huss, G.R. & Lewis, R.S. (1995) Presolar diamond, SiC, and graphite in primitive chondrites: Abundances as a function of meteorite class and petrologic type. Geochimica et Cosmochimica Acta 59 (1):115-160 (Jan 1995).

Zanda, B., Bourot-Denise, M. & Hewins, R. H. (1995) Condensate Sulfide and Its Metamorphic Transformations in Primitive Chondrites: Meteoritics 30 (5): 605 (Sept 1995).

Srinivasan, G., Russell, S.S., MacPherson, G.J., Huss, G.R. & Wasserburg, G.J. (1996) New Evidence for 26Al in CAI and Chondrules from Type 3 Ordinary Chondrites: Lunar and Planetary Science 27: 1257-1258.

Russell, S.S., Huss, G.R., MacPherson, G.J. & Wasserburg, G.J. (1997) Early and late chondrule formation - New constraints for solar nebula chronology from Al-26/Al-27 in unequilibrated ordinary chondrites: 28th Annual Lunar and Planetary Science Conference: 209-210.

Fisenko, A.V. & Semenova, L. F. (1997) On the Selection of Chondrites for Studying Interstellar Diamond. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences.

Brearley, A. J. & Jones, R. H. (1998). Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

Beckett et al. (2006) Chemical processes in Calcium-Aluminum-rich Inclusions: A Mostly CMAS View of Melting and Crystallization: In: Meteorites and The Early Solar System (Editors: Lauretta, D.S. & McSween Jr, H.Y.) University of Arizona Press. Tucson. pp. 399-429.

Huss, G.R., Rubin, A.E. & Grossman (2006) Thermal Metamorphism in Chondrites: In: Meteorites and The Early Solar System (Editors: Lauretta, D.S. & McSween Jr, H.Y.) University of Arizona Press. Tucson. pp. 567-586.

Brearley, A.J. (2006) — The Action of Water: In: Meteorites and The Early Solar System (Editors: Lauretta, D.S. & McSween Jr, H.Y.) University of Arizona Press. Tucson. pp. 603-624.

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