The Dengli H3 complex breccia: A 1976 find from the Karakoom Desert

Ivanova, М. А.; Zaslavskay, N. I.; Kononkova, N. N.

doi:10.1111/j.1945-5100.1992.tb00229.x

Cited by 2 publications

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“…The Dengli (H3) meteorite is a complex chondritic breccia containing several angular clasts and inclusions (Ivanova et al 1992(Ivanova et al , 1993. The plagioclase phases from a silica-bearing inclusion, an angular clast (clast number 2 of Ivanova et al 1992) and a chondrule were analysed by us.…”

Section: Sample Details and Experimental Proceduresmentioning

confidence: 99%

26Al as a heat source for early melting of planetesimals: Results from isotopic studies of meteorites

Sahijpal

Ivanova

Kashkarov

et al. 1995

Proc. Indian Acad. Sci. (Earth Planet Sci.)

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Ion microprobe studies of magnesium isotopic composition in igneous components from several chondritic meteorites have been carried out to look for 26Mg excess that may be attributed to the presence of the now-extinct radionuclide Z6Al(~ ~ 1 Ma) at the time of formation of these objects. A positive evidence for the presence of 26A1 in the analysed objects will strengthen its case as the primary heat source for the early thermal metamorphism/melting ofmeteorite parent bodies. Based on calculated temperature profiles inside chondritic objects of different sizes and initial 26AI/27Ai ratios, we have estimated the initial abundances of 26A1 needed to provide the heat necessary for the wide range of thermal processing seen in various types of meteorites. The magnesium isotopic data obtained by us do not provide definitive evidence for the presence of 26Al at the time of formation of the analysed igneous phases in different chondritic meteorites. Experimental evidence for a planetary scale distribution of 26A1 in the early solar system to serve as a significant heat source for the thermal metamorphism and melting of meteorite parent bodies (planetesimals) remains elusive.

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Section: Sample Details and Experimental Proceduresmentioning

confidence: 99%