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Isheyevo meteorite, Bashkortostan Republic (Bashkiria Republic), Southern Urals, Urals Region, Russia

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Carbonaceous Chondrite (CH/CBb S4)

In 2003 a single 16 kg metal-rich stone was found by a tractor driver during harvest time close to the Isheyevo village in the Southern Urals. Isheyevo’s bulk Mg-Si and oxygen isotope ratios mark it as a carbonaceous chondrite. In addition, its isotope rations and high Fe-Ni metal content (>50 vol%) indicate a more specific membership within the carbonaceous chondrite CR clan (CR, CBa, CBb & CH Chondrites). What is especially unusual about Isheyevo, however, is that it is a more or less half-half mixture of highly shocked CH- and CBb-like chondritic material. Both CH and CBb meteorites contain small chondrules and unusually high N15/N14 isotope ratios. Usually, however, CBb meteorites contain more Fe-Ni metal and CH meteorites contain more refractory inclusions. While Isheyevo’s overall lithology is dominated by regions with 40-50 vol% Fe-Ni metal, metal content varies from 7%-90%. Olivine-and/or-pyroxene components plus a few other minor components are readily identified within the chondrules and other lithic elements. Isheyevo’s non-metallic regions also contain unusually fine-grained hydrated silicates, sulfides, carbonates with intermingled glasses. Definitive mineralogical determinations for these minute and intermingled phases, however, is usually difficult.

While refractory inclusions constitute only about 1% of Isheyevo’ volume, they have been the focus of much recent work. Some of Isheyevo’s inclusion minerals were formed at very high temperature — apparently very near the beginning of the inner solar system’s planetismal and asteroidal formation epoch. The fact that Isheyevo is nearly 9 times more massive than any CH chondrite and is more massive than any normal CBb chondrites provides welcome material for research.

Mineral List

16 entries listed. 11 valid minerals.

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Sara S. Russell et al., (2005). The Meteoritical Bulletin, No. 89, 2005 September. Meteoritics & Planetary Science 40 (9, Suppl.): A201-A263. (Sept 2005).

Ivanova, M. A., Nazarov, M. A., Kononkova, N. N. & Brandstaetter, F. (2005). Isheyevo: A New CB Chondrite. Meteoritics & Planetary Science 40 (9, Supplement): A74, pdf. #5073. (Sept 2005).

Grokhovsky, V. I. (2006). Osbornite in CB/CH-like Carbonaceous Chondrite Isheyevo. Meteoritics & Planetary Science 41 (8, Supplement): A68, pdf#5231. (Aug 2006)

Ivanova et al., (2008) The Isheyevo meteorite: Mineralogy, petrology, bulk chemistry, oxygen, nitrogen, carbon isotopic compositions, and 40Ar-39Ar ages. Meteoritics & Planetary Science 43 (5): 915-940. (May 2008).

Krot, A. N., Ulyanov, A. A. & Ivanova, M. A. (2008). Refractory inclusions in the CH/CB-like carbonaceous chondrite Isheyevo: I. Mineralogy and petrography. Meteoritics & Planetary Science 43, #9, 1531-1550. (Sept 2008).

Bonal, L., Huss, G. R., Krot, A. N. & Nagashima, K. (2010). Chondritic lithic clasts in the CB/CH-like meteorite Isheyevo: Fragments of previously unsampled parent bodies. Geochimica et Cosmochimica Acta 74, #8, 2500-2522. (April 2010).

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