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    Wyświetlanie 1-9 z 9
    Tytuł:
    Radioactivity of the Baszkówka meteorite
    Autorzy:
    Biernacka, M.
    Isajenko, K.
    Lipiński, P.
    Żak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059301.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    meteorites
    radioactivity
    gamma spectrometry
    Opis:
    In January 1996 a fragment, and in May 1996 a cut slab of the Baszkówka meteorite, were delivered for the radioactivity analysis to the Dosimetry Department of the Central Laboratory for Radiological Protection (CLOR) in Warsaw. The measurement method was gamma spectrometry using HPGe (High Purity Germanium) detectors. The CLOR prepared volume calibration source identical to the cut slab of the meteorite delivered for analyses. The presence of 40K and the cosmogenic radionuclides such as 54Mn and 22Na was detected in the Baszkówka meteorite. The results and measurement method are discussed.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 327-330
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two spinel-bearing compound chondrules from the Baszkówka meteorite
    Autorzy:
    Borucki, J.
    Stępniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059304.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    meteorites
    ordinary chondrites
    spinel
    Opis:
    The present paper describes two compound chondrules labelled panda and chevron, discovered in the Baszkówka meteorite. Optical microscope, electron microscope and electron microprobe studies revealed an unusual mineral composition and fabric. Both chondrules include "primary" and "secondary" components. The panda and chevron chondrules have apparent diameters of ~0.86 and ~0.54 mm respectively with spinel dominant in primary components and olivine-plagioclase in secondary components overlain by thin microcrystalline rims. Euhedral or subhedral Mg, Fe2+/Al, Cr-spinel crystals from the panda's primary component (zoned, cavernous or homogeneous) were not found in Mg-Fe chondrules in Baszkówka, where Cr occurs exclusively as chromite. Olivine crystals from panda's primary (Fa27.1) and secondary (Fa26.5) component have similar compositions to those from panda's rim (Fa26.4) and comparable to olivine from other Baszkówka Mg-Fe chondrules (average ~Fa25.7). The Ca-plagioclase laths from the groundmass of panda's primary component has an extremely variable composition (~An49 to ~An60), evidently more calcic than those in other chondrules of the meteorite (mean ~An13). The primary components of the two spinel-bearing chondrules may have been formed in a fireball generated by powerful impact during early accretion of a protoplanet. After crystallisation the spinel crystals were abraded and polished, probably during rapid flight through a dense cloud of interplanetary dust. The moderately reducing conditions of the hypothetical fire ball were replaced by a more reducing environment during the condensation of the rims of both chondrules.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 281-288
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Euhedral crystals in interstitial pores of the Baszkówka and Mt. Tazerzait L5 chondrites
    Autorzy:
    Wlotzka, F.
    Otto, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059306.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    Tazerzait Mountains
    euhedral crystals
    pores
    chondrites
    Opis:
    Euhedral to anhedral crystals of the main meteoritic minerals are found in interstitial pores of the unshocked L5 chondrites Baszkówka and Mt. Tazerzait. The composition of these pore minerals is the same as elsewhere in the meteorite. They must have grown from a vapour phase during metamorphic equilibration of the meteorite minerals. The pores are primary features, i.e. open space remaining after compaction of the constituents of the meteorite.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 257-262
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mineralogy of the Baszkówka chondrite (L5 S1): new data on silicates, opaques and minor minerals
    Autorzy:
    Borucki, J.
    Stępniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059302.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    meteorites
    ordinary chondrites
    minerals
    spinel
    picotite
    Opis:
    The mineral composition of the Baszkówka meteorite comprises: olivine, pyroxenes, plagioclase, Fe,Ni metal, troilite and chromite with minor chlorapatite, whitlockite, magnetite, haematite, spinel, idaite, calcite and native Cu. A rare variety of spinel (picotite), probably the oldest among the minerals of Baszkówka, was identified in the only two chondrules named: panda and chevron. The composition of the olivine (Fa 26.2š1.8 wt.%) and the high degree of chondrite homogenisation, a result of thermal metamorphism, are consistent with earlier results and indicate the L5 group. No distinct shock effects were observed in Baszkówka, classified as S1. Troilite-Fe,Ni and Fe,Ni metal lumps are defined and interpreted as molten planetesimals impact splashes.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 229-256
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Petrography of the Baszkówka chondrite
    Autorzy:
    Siemiątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059299.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    ordinary chondrites
    chondrules
    structure
    petrography
    classification
    origin
    Opis:
    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.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 263-280
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxygen-isotopic compositions of minerals from the Baszkówka chondrite
    Autorzy:
    Maruyama, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059312.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    meteorites
    ordinary chondrites
    chondrules
    spinel
    oxygen isotopes
    Opis:
    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.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 303-312
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on chemical composition of Baszkówka and Mt. Tazerzait chondrites
    Autorzy:
    Dybczyński, R.
    Chwastowska, J.
    Danko, B.
    Kulisa, K.
    Polkowska-Motrenko, H.
    Samczyński, Z.
    Sterlińska, E.
    Szopa, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059297.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    Tazerzait Mountains
    meteorites
    chondrites
    neutron activation analysis
    speciation
    cosmochemistry
    Opis:
    The elemental contents of two new meteorites, Baszkówka (Poland, 1994) and Mt.Tazerzait (Niger, 1991), were studied by instrumental and radiochemical neutron activation analysis (NAA), supplemented in the case of some elements by gravimetric, titrimetric, spectrophotometric and atomic absorption spectrometric measurements. In total 28 elements were determined for each meteorite. A striking similarity in the bulk chemical composition of the two meteorites was observed. In the case of Baszkówka some study of the elemental contents of the magnetic fraction and the distribution of elements between kamacite and taenite phases was also made. This study confirms that Baszkówka and Mt. Tazerzait are generally more similar to L chondrites than to any other class of chondrites. However both meteorites show also some distinctive features (e.g very low Hg content), distinguishing them from all other L chondrites known. Both meteorites may derive from a common parent body, which may be different from that typical for other chondrites.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 289-302
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    K/Ar dating and stable isotope analysis of the Baszkówka and Mt. Tazerzait L5 chondrites
    Autorzy:
    Hałas, S.
    Wójtowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059307.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    Tazerzait Mountains
    chondrites
    K/Ar ages
    oxygen isotopes
    sulphur isotopes
    Opis:
    We have determined the content of 40Ar* (1.49 nmol/g) and 4He (1.75 nmol/g) in the Baszkówka meteorite by static vacuum mass spectrometry. The radiogenic argon content was calculated from the measured argon spectrum using the equation: 40Ar* = 40Ar - 295.536Ar assuming a potassium content of 680 ppm wgt. We have obtained K/Ar ages of 3.78 Ga for the chondrules and 3.47 Ga for a bulk sample of Baszkówka. A similar 4He content (1.47 nmol/g) but larger 40Ar* (2.32 nmol/g) content was found for the Mt. Tazerzait bulk sample. The K/Ar age of this meteorite on the basis of the K content (732 ppm) is 4.34 Ga. Sulphur isotope analysis of troilite specimens from both meteorites reveals essentially negative delta 34S values: -1.25š0.06o/oo for Baszkówka and -1.18š0.06o/oo for Mt. Tazerzait expressed on the V-CDT scale. This indicates that both chondrites may have a common origin. The oxygen isotope data (delta 18O = 4.88š0.03o/oo and delta 17O = 3.66š0.10o/oo) suggests that Baszkówka belongs to the L chondrites.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 315-318
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noble gases in Baszkówka and Mt. Tazerzait
    Autorzy:
    Scherer, P.
    Schultz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059313.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    Tazerzait Mountains
    meteorites
    noble gases
    cosmic-ray exposure age
    gas retention ages
    Opis:
    Concentration and isotopic composition of noble gases have been measured in bulk samples of the L5 chondrites Baszkówka and Mt. Tazerzait. Compared to other chondrites both meteorites have very large cosmic-ray exposure ages of 74 and 60 million years, respectively. During their history both meteorites were not involved in major thermal events.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 313-314
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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