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1
Content available Microstructure on NWA 4435 meteorite
Szurgot M., Polański K.
Scientific Bulletin. Physics / Lodz University of Technology
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2008
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Vol. 29
75-83
EN
Elemental composition, mineral composition and microstructure of NWA 4435 meteorite found in 2006 has been studied by analytical electron microscopy and optical microscopy. It was established that the main meteorite minerals: olivines, pyroxenes, troilite, and graphite identified in the sample represent extraterrestrial minerals typical of carbonaceous chondrites. Chemical and mineral composition, petrologic type of chondrules, their abundance and sizes, the presence of troilite, and abundance of oxidized iron phases confirm CV3 class of this chondrite.
PL
Badano skład chemiczny i mineralny oraz mikrostrukturę meteorytu NWA 4435. Zanalizowano chondry i ciasto skalne meteorytu. Obecność chondr, troilitu, inkluzji wysokotemperaturowych oraz tekstura próbki świadczą o pozaziemskim pochodzeniu badanej skały i przynależności tego meteorytu do chondrytów węglistych klasy CV3.
2
Content available Microscopic investigations of Gold Basin and El Hammami chondrites
Szurgot M., Polański K.
Scientific Bulletin. Physics / Lodz University of Technology
|
2007
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Vol. 28
79-94
EN
Elemental and mineral composition of Gold Basin and El Hammami meteorites discovered in 1995 and 1997 have been studied by analytical electron microscopy and optical microscopy. It was established that the main meteorite minerals: olivines, pyroxenes, kamacite and taenite as well as troilite identified in the samples represent extraterrestrial minerals typical of the ordinary chondrites. Feldspars represented by plagioclase, orthoclase, magnetite, calcite, chromite and silica have been also present in the studied samples. Chemical and mineral composition, iron content, petrologic types of chondrules, their abundance and sizes, the presence of troilite veins and abundance of nonoxidised iron phases confirm H class of El Hammami chondrite, i.e.. olvine-bronzite class, and L class of Gold Basin, i.e. olivine-hyperstene class.
PL
Badano skład chemiczny i mineralny meteorytów Gold Basin i El Hammami. Zanalizowano chondry i ciasto skalne. Obecność chondr oliwinowych, chondr piroksenowych, żył troilitowych oraz faz żelazo-niklowych: kamacytu i troilitu świadczą o pozaziemskim pochodzeniu badanych skał. Oprócz minerałów najbardziej rozpowszechnionych w meteorytach takich jak: oliwin, piroksen, kamacyt, taenit i troilit wykryto także plagiklazy, magnetyt, kalcyt, chromit, ortoklaz i krzemionkę. Zgodnie z uprzednią klasyfikacją Gold Basin jest chondrytem klasy L o niskiej zawartości żelaza, a El Hammami chondrytem typu H zawierającym dużo żelaza.
3
Content available remote Microscopic studies of NWA4047 meteorite
Szurgot M., Polański K., Krystek M.
Scientific Bulletin. Physics / Lodz University of Technology
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2006
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Vol. 27
61-76
EN
Elemental and mineral composition of NWA4047 meteorite found in 2005 has been studied by analitical electron microscopy and optical microscopy. It was established that the main meteorite minerals: olivines, pyroxenes, kamacite and taenite as well as troilite identified in the sample represent extraterrestrial minerals typical of the ordinary chondrite of high iron content. Chemical and mineral composition, petrologic types of chondrules, their abundance and sizes, the presence of troilite veins and abundance of nonoxidised iron phases confirm H class of this chondrite, i.e. olvine-bronzite class.
PL
Badano skład chemiczny i mineralny meteorytu NWA 4047. Zanalizowano chondry i ciasto skalne tego meteorytu. Obecność chondr, żył troilitowych oraz faz żelazo-niklowych: kamacytu i troilitu świadczą o pozaziemskim pochodzeniu badanej skały i przynależności tego meteorytu do chondrytów żelaznych o dużej zawartości żelaza, tj. do klasy chondrytów oliwinowo-bronzytowych.
4
Content available Polish scientists in studies of extraterrestrial matter; past, present, reminiscences
Manecki A.
Geological Quarterly
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2001
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Vol. 45, No 3
211-218
EN
The contributions of Polish scientists to studies of extraterrestrial matter are described, and a history of investigations into the Pułtusk, Łowicz, Morasko and Baszkówka meteorites is given. Opinions expressed in Polish journals on the structure and genesis of chondrules are discussed, together with the results of X-ray structural research of graphites. Polish papers devoted to the studies of cosmic dusts, particularly of their aluminosilicate glass, are summarized. In this context the use of the infrared method in distinguishing terrestrial and cosmic glasses is stressed.
5
Content available Petrography of the Baszkówka chondrite
Siemiątkowski J.
Geological Quarterly
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2001
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Vol. 45, No 3
263-280
EN
The Baszkówka chondrite comprises chondrules, individual crystals of olivine, xenomorphic concentrations of kamacite and troilite, matrix and pores up to 3.0 mm in diameter; porosity reaches 20% by volume. Measurements of 697 chondrules in an area of 250 m2 enabled distinction of three populations. The chondrules and olivine crystals have been sintered at high temperatures. Six structural types showing transitions between porphyritic and granular structures have been discriminated. Rims showing a similar diversity surround about 10% of chondrules. The composition and structure of the chondrules suggest a source from the nebular dust disk around the Sun. The abudance of voids and their relatively large size and a lack of fissures, indicate a small size of the host body, which must have been derived from an early phase of protoplanet formation.
6
Content available Oxygen-isotopic compositions of minerals from the Baszkówka chondrite
Maruyama S.
Geological Quarterly
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2001
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Vol. 45, No 3
303-312
EN
Oxygen isotopic compositions of two picotite-bearing chondrules from Baszkówka L5(S1) equilibrated ordinary chondrite have been determined by secondary ion mass spectrometry. The O-isotopic compositions of the minerals in the picotite-bearing chondrules are slightly more 16O-rich than the bulk O-isotopic composition of Baszkówka. The petrological properties and the O-isotopic compositions of these chondrules suggest that they have closer relationship to ferromagnesian chondrules than CAIs. The 16O-enrichment of the picotite-bearing chondrules may result from incomplete O exchange reaction between 16O-rich chondrule precursors and the 16O-poor solar nebular gas. This implies that the picotite-bearing chondrules are more primitive than ordinary ferromagnesian chondrules in Baszkówka. The O-isotopic compositions of the minerals in one of these chondrules relate to the crystallization sequence. These O-isotopic variations of minerals within the chondrule may result from incomplete O exchange between the chondrule melt droplet and the nebular gas. The heterogeneity of the O-isotopic composition in Baszkówka indicates that Baszkówka has not been homogenized completely during thermal metamorphism and/or secondary alteration.
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