Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27s.214d&link_type=abstract
Meteoritics, vol. 27, no. 3, volume 27, page 214
Other
Scientific paper
During a recent visit to Bulgaria one of the authors (BDD) had the opportunity to examine the Bulgarian National Collection of Meteorites. Five of the chondrites in the collection are falls from Bulgaria (Gumoschnik, Konovo, Paval, Rasgrad, and Virba). It was decided, in light of modern technology, to reexamine their mineralogy and petrography in order to provide additional data for classification purposes, and to search for other interesting features. In this study, Paval, Gumoschnik, and Debnevo (v. Gumoschnik) were examined for their olivine and pyroxene compositions. In Gumoschnik the fayalite contents range from Fa 18.85 to Fa 20.0, with an average content of Fa 19.21 (PMD=2.28%). The low-Ca pyroxene contents range from Fs 15.76 to Fs 19.95, with an average content of Fs 16.95 (PMD=4.54%). Petrographically, Gumoschnik is best classified as an equilibrated H5 chondrite. Similar compositions were found in the specimen labeled Debnevo (v. Gumoschnik). Fayalite contents range from Fa 18.83 to Fa 20.92, with a mean value of Fa 19.48 (PMD=2.17%). The contents for low-Ca pyroxene range from Fs 15.88 to Fs 20.92, with a mean of Fs 16.54 (PMD= 1.58%). This data supports both specimens belong to the same fall, despite the higher pyroxene PMD value in Gumoschnik. This can be attributed to the heterogeneous nature of many chondrites or in the sampling for analysis. The last chondrite examined in the present study is Paval. Fayalite contents range from Fa 19.19 to Fa 20.19, with a mean of Fa 19.75 (PMD=1.42%). The low Ca-pyroxene range from Fs 17.13 to Fs 21.73, with a mean content of Fs 19.0 (PMD= 10.24). Petrographically, classification as an equilibrated H5 chondrite appears best, despite the high PMD value for the pyroxene.
Dod Bruce D.
Olsen Edward J.
Popov Andrey M.
Sipiera Paul P.
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