Ozdín, Daniel

English

Ozdín Daniel

Uher Pavel

Kanuchová Z.

Svoren J.

Baratta G. A.

Porubcan V.

Tóth József

University of Szeged

Acta Mineralogica-Petrographica, Abstract Series, Szeged, Vol. 7, 2012 99 Joint 5th Mineral Sciences in the Carpathians Conference and 3rd Central-European Mineralogical Conference 20–21 April, 2012, University of Miskolc, Miskolc, Hungary MINERALOGICAL RESEARCH OF THE KOŠICE CHONDRITE (SLOVAKIA)   OZDÍN, D.1*, UHER, P.1, KAŇUCHOVÁ, Z.2, SVOREŇ, J.2, BARATTA, G.A.3, PORUBČAN, V.4 & TÓTH, J.4 1 Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia 2 Astronomical Institute of Slovak Academy of Sciences, 05960 Tatranská Lomnica, Slovakia 3 INAF – Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy 4 Department of Astronomy, Physics of the Earth and Meteorology, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynská dolina G, 842 48 Bratislava, Slovakia * E-mail: daniel.ozdin@gmail.com  On February 28, 2010 at 23:24:46 CET a very bright fireball over a wide area of the city of Košice in Eastern Slovakia, followed by a fall of meteorite was observed. Fireball was clearly visible from a distance of several hundred kilometres. In some parts of Eastern Slovakia and Northern Hungary also sound effects accompanying falling meteorite similar to thunder or the explosion, were recorded. Sonic booms were recorded at 7 seismic stations in Slovakia, Hungary, and Poland. Bolide was recorded also by radiometric sensors at six automatic bolide stations in the Czech Republic and one in Aus-tria. On the basis of two private security cameras in Hungary (Örkény and Telki), which captured the fire-ball, trajectory and approximate location of the impact of meteorites, were calculated. Meteorite flew over Slovakia from west to east and disintegrated at explo-sion 35 km above the surface. Most of the meteorite fell on the area between Košice town and Vyšný Klátov village. By August 2010, 76 fragments of the meteorite were recovered of a total weight of 4.3 kg. The largest fragment is of the weight of 2.17 kg. Considering that individual meteorite fragments were found only a few weeks after the fall, the samples were only slightly af-fected by weathering. The Košice meteorite is the first Slovak meteorite and only the 15th with the known orbit in the interplanetary space. The meteorite Košice was officially approved by the Nomenclature Committee of the Meteoritical Society on June 27, 2011.  Mineralogical research was done mainly by using of polarized microscopy, electron microprobe (WDS, EDS, BSE, CL methods). From other analytical methods also Micro-Raman spectroscopy, ICP-MS, ICP-ES, Infrared spectroscopy, and powder X-ray diffraction, were ap-plied.  In the thin sections meteorite is characterized by highly recrystallized fine-grained granular texture with abundant chondrules. Part of meteorite exhibits brecci-ated character, but individual breccia fragments show almost the same composition. Several types of chon-drules are present; they are commonly indistinct and only a part of them are clearly visible. Most of chon-drules contain forsterite but albite, augite and enstatite are also abundant. Rarely, some chondrules are formed predominantly by chromite. These chondrules have granular texture and usually are not of a perfect round shape. Size of chondrules is up to 1.1 mm. The Košice chondrite has a dark gray to black fusion crust with thickness up to 0.6 mm. Fusion crust is characteristic by remelting silicates, phosphates and oxides. Fe-Ni alloys were not remelting. Based on the average compositions of forsterite (Fa19) and enstatite (Fs17), high metallic Fe and other criteria, the meteorite could be classified as the H-group ordinary chondrite. According to homogeneous compo-sitions of forsterite (olivine) and enstatite, absence of igneous glass, presence of secondary albite predomi-nately as crystalline aggregates and overall texture with (relatively high metamorphic grade) enable us to clas-sify the Košice chondrite as petrologic type H5. Planar fractures in olivine and undulatory extinction of olivine and albite as well as opaque shock veins and locally melt pockets indicate S3 stage of shock metamorphism.  Mineralogy of the meteorite is characteristic for this type of chondrite. The major non-metallic minerals of the chondrite are forsterite, enstatite and albite (Ab82An12Or06). Additional minerals comprise augite (En45–59Wo26–43Fs08–15), chromite, chlorapatite, merril-lite/tuite, graphite and Fe-oxides. Accessory graphite (<1 vol%) was confirmed by Micro-Raman spectrome-try. Metallic phases are represented mostly by taenite, iron (kamacite) and tetrataenite. Sulphides are repre-sented only by troilite. Iron and taenite form characteris-tic immiscible textures. Chemical composition of Fe, Ni alloys shows a rising of Ni + Cu contents with current recession of Fe + Co contents. Rarely, troilite forms veinlets with taenite skeletal crystals. These veinlets are one of the primary minerals in the chondrite and may indicate mobilization of metallic elements during meta-morphism or local impacts-induced phenomena.  Acknowledgement. This work was supported by the Slovak Research and Development Agency under the contract No. APVV-0516-10 and VEGA – the Slovak Agency for Science, grant No. 2/0022/10.      

Mineralogical research of the Košice chondrite (Slovakia)

http://acta.bibl.u-szeged.hu/33034/1/mineralogica_as_007_099.pdf

Mineralogical research of the Košice chondrite (Slovakia)

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