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    Wyświetlanie 1-9 z 9
    Tytuł:
    NWA 6255 meteorite − Thermophysical properties of interior and the crust
    Autorzy:
    Łuszczek, K.
    Wach, R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411502.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    NWA 6255
    DSC
    thermophysical properties of meteorite
    specific heat capacity
    troilite phase transition
    troilite cosmothermometer
    Opis:
    Differences in the thermophysical properties of NWA 6255 meteorite samples obtained from various locations with respect o the distance from the surface of the meteorite were evaluated by a differential scanning calorimetry (DSC). DSC is a perfect tool to experimentally verify theoretically predicted thermophysical properties of extraterrestrial matter. The specific heat capacity of the crust and the interior of meteorite were determined to be in the temperature range of 223‒823 K. Measured Cp values at room temperature for crust and for the interior of this meteorite were 602 and 668 J·kg–1·K–1, respectively. In addition, the phase transition of troilite from: (a) the fusion crust samples, (b) the edge part of the meteorite (1‒2 mm below the crust), and (c) the interior (over 10 mm below the fusion crust) was examined. It is shown that the shift of α/β transition peak of the troilite exhibits the temperature gradient evolved during atmospheric passage of a meteoroid. Moreover, the enthalpy changes of α/β transition were used to determine the troilite content in the meteorite samples (3.6 wt.%). Obtained data are in agreement with previous Leco method’s results, since NWA 6255 is relatively fresh find (W1) and troilite tends to oxidized quickly.
    Źródło:
    Meteorites; 2014, 3, No. 1-2; 33-44
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cieszyn – nowy polski meteoryt
    Cieszyn – a new polish meteorite
    Autorzy:
    Karwowski, Łukasz
    Kotowiecki, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1032665.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Cieszyn
    daubreelite
    iron meteorite
    kamacite
    meteorites
    oktahedrite
    taenite
    troilite
    Opis:
    On 21 of July 2001, small fragment of metal has been found on side walk, near branch of Silesian University in Cieszyn, by Ms. Małgorzata Kotowiecki. After a few years, the metallic fragment was carefully study. The investigation show that the metallic element has meteoritic origin. The mineral composition of the meteorite (kamacite, taenite, tetraenite, troilite, daubreelite) classify it as an iron meteorite and the most probably is representative of octahedrite. The meteorite has features of shock metamorphism and represent very old fall. It could be supposed that the meteorite has been transported to the destination place, together with gravel.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 48-51
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polimineralne nodule w gruboziarnistym meteorycie Morasko
    Polymineral nodules in coarse-grained Morasko meteorite
    Autorzy:
    Karwowski, Łukasz
    Muszyński, Andrzej
    Kryza, Ryszard
    Pilski, Andrzej S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032667.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko iron IAB meteorite
    altaite
    graphite
    meteorites
    oxides
    silicates
    sulphides
    troilite
    Opis:
    Morasko meteorite (IAB octahedrite) contains numerous graphite-troilite inclusions. Within these inclusions, many mineral phases have been found, including native elements, sulphides, tellurides, oxides, phosphates and silicates. Apart from dominant graphite and troilite, the following minerals occur: copper, sphalerite, daubreelite, chromite, cosmochlor, enstatite, albite and orthoclase; phosphates (buchwaldite and brianite) are found occasionally, whereas djerfischerite, altaite, olivine and silica are rare. The mineral composition of the nodules suggests a more complex origin of the Morasko-type meteorites than currently assumed.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 52-58
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Minerały akcesoryczne w meteorycie Morasko
    Acessory minerals of meteorite Morasko
    Autorzy:
    Grzegolec, Urszula
    Muszyński, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1032974.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko meteorite
    graphite nodules
    meteorites
    meteoryt Morasko
    nodule troilitowo-grafitowe
    troilite
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2013, 4; 132-133
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowy niezbrekcjonowany meteoryt enstatytowy z Algierii
    A new unbrecciated enstatite meteorite from Algeria
    Autorzy:
    Karwowski, Łukasz
    Szyszka, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1032394.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Si- bearing kamacite
    enstatite
    enstatite achondrite
    keilite
    niningerite
    oligoclase
    siliceous glass
    troilite
    Opis:
    In this paper, a new mineralogical and chemical data on a new brecciated enstatite are presented. Fe-low enstite is the main pyroxene. Locally small grains of diopside were noted. The rest of silicates are represented by oligoclase and cristobalite. Siliceous glass was also found. The meteorite contains up to11.5 vol.% of Ni-kamacite (up to 6.8 wt.% of Ni and up to 2.9 wt.% of Si). Niningeryt and Cr-rich troilite are the main sulphides. Small amount of graphite forms a bundle-like agregates of fine plate crystals. The classification is still in progres. The new meteorite from Algeria can be an example of unbrecciated enstatite or ungrouped achondrites.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2019, 10; 51-61
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Mössbauer studies of the Baszkówka ordinary chondriteand some other meteorites
    Autorzy:
    Gałązka-Friedman, J.
    Bauminger, E. R.
    Nowik, I.
    Bakun-Czubarow, N.
    Stępniewski, M.
    Siemiątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059308.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ordinary chondrites
    parent body
    Mössbauer spectroscopy
    Q angle
    troilite
    kamacite
    olivine
    pyroxene
    weathering
    oxidation
    Opis:
    It was suggested that perhaps Mössbauer parameters of troilite could serve as a criterion for an interpretation of the origin of various meteorites. It was found that in three meteorites coming from the same parent body (Baszkówka, Mt. Tazerzait and Songyuan) the angle between the principal axis of the electric field gradient (EFG) and the direction of the magnetic field in troilite is around 60o. Further investigations showed that in some other meteorites, not belonging to this group, this angle is close to 90o.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 319-326
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skład chondrytów zwyczajnych a potencjalne surowce pasa planetoid
    Composition of Ordinary Chondrites and Potential Natural Resources of Asteroid Belt
    Autorzy:
    Łuszczek, Katarzyna
    Przylibski, Tadeusz A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032729.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Fe-Ni alloy
    asteroid
    asteroid belt
    chondrite
    extraterrestrial resource
    meteorite
    meteorites
    natural resource
    ordinary chondrite
    troilite
    Opis:
    In this article the authors present a simple method of determining the content of selected metal raw materials (Fe, Ni, Co) on the parent bodies of ordinary chondrites. Thanks to the use of planimeter for measuring, under microscope, polished slices of meteorites, it is possible to estimate quite accurately the proportion of these metals in the parent bodies of meteorites, i.e. on asteroids. When it comes to analysing a large number of polished slices, these results will be most likely comparable to much more expensive results of chemical tests conducted on meteorites. Based on the analysis of 16 thin polished sections and polished slices of 11 ordinary chondrites, the authors found out that the highest content of Fe, Ni and Co ore minerals, reaching 10,06% of the total volume, can be found in ordinary chondrites from group H. For ordinary chondrites from groups L and LL, it makes 3,86% and 3,93% of the volume respectively. Employing the results of chemical analyses available in literature sources, the authors also estimated the size of Fe, Ni and Co resources for several selected asteroids. These bodies contain higher concentrations of iron, nickel and cobalt than terrestrial deposits (those found in the earth’s crust). The total content of Fe on parent bodies of even the most deficient in metals group LL of ordinary chondrites is about twice as high as that in the earth’s crust. Cobalt occurs on parent asteroids of ordinary chondrites in concentrations 15–24 times as high as those in the earth’s crust, and the concentrations of Ni are 100–180 times as high as those in the earth’s crust. The contents of these metals on parent asteroids of ordinary chondrites are also several times as high as those in currently extracted deposits in the earth’s crust. Taking into account the mean annual terrestrial production of these metals, the authors have estimated that a parent asteroid of ordinary chondrites with the size between 433 Eros and 6 Hebe could satisfy our need for Fe, Ni and Co for the nearest several million to dozens of billion years. Considering the fact that asteroid belt contains plenty of such objects, and as many asteroids built chiefly of Fe-Ni alloy, one should regard this section of the Solar System as a practically inexhaustible source of metal raw materials. The prospect of their exploitation is probably much nearer than we can currently imagine.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 92-111
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Średni ciężar atomowy chondrytu Vicência (LL3.2)
    Mean atomic weight of Vicência LL3.2 chondrite
    Autorzy:
    Szurgot, Marian
    Powiązania:
    https://bibliotekanauki.pl/articles/1033113.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    LL3 chondrites
    Mössbauer spectroscopy
    Vicência chondrite
    grain density
    iron to silicon ratio
    mean atomic number
    mean atomic weight
    ordinary chondrites
    troilite content
    Opis:
    Mean atomic weight Amean of Vicência (LL3.2 S1W0, fall 2013) ordinary chondrite has been calculated using literature data (Keil et al. 2015) on chemical composition of the meteorite and using relationships: between mean atomic weight and Fe/Si atomic ratio, between Amean and grain density, and between Amean and magnetic susceptibility. It was shown that Vicência’s Amean = 22.91 for composition without water. This value is close to the mean atomic weight of LL chondrite falls, is close to Amean value of LL3 chondrite falls, and is close to Amean value of Semarkona LL3.0 chondrite. Vicência’s Fe/Si atomic ratio (0.492±0.050) leads to Amean = 23.06–23.26, which is close to the value determined by bulk composition. Vicência’s Fe/Si atomic ratio is close to the value for Semarkona’s (Fe/Si = 0.511), and is close to LL’s mean Fe/Si ratio (0.520). This confirms that Vicência belongs to LL chondrites, as previously classified. Using dependence between mean atomic weight and grain density leads to Amean = 21.89±0.54 (dgr = 3.28 g/cm3, Keil et al. 2015), and using dependence between Amean and magnetic susceptibility gives Amean = 23.01±0.24 (logc = 4.30, Keil et al. 2015). Arithmetic mean of Amean (dgr), Amean (logc), and Amean(Fe/Si), gives 22.72±0.73, the value close to Amean(bulk composition) determined using compositional data. Mean atomic number Zmean, and Amean/Zmean ratio of the meteorite have been also calculated. Vicência’s Zmean = 11.37, and Amean/Zmean ratio is: 2.015 for composition without water. Vicência’s silicates shown the values: Amean = 21,67, Zmean = 10.76, Amean/Z mean = 2.014, Fe/Si = 0.318, Amean(Fe/Si) = 22.07–22.18, and Fe, Ni metal values: Amean = 56.63, Zmean = 26.53, and Amean/Z mean = 2.135. Two dependences: i) grain density dgr on Amean, and ii) grain density dgr on Fe/Si atomic ratio, were used to determine/verify grain density of Vicência chondrite. It was established that dgr(Amean) leads to the values: 3,42 g/cm3 for Vicência chondrite, 3,25 g/cm3 for silicates, and 7,90 g/cm3 for Fe, Ni metal of Vicência meteorite. Dependence dgr(Fe/Si) predicts density for Vicência chondrite: 3,47–3,49 g/cm3, and for silicates: 3,32–3,35 g/cm3.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2018, 9; 126-144
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondryt Sołtmany
    Sołtmany chondrite
    Autorzy:
    Przylibski, Tadeusz A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033061.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Gefion family
    L6
    asteroid
    atomic weight
    bulk chemistry
    cosmic-ray exposure age
    cosmogenic radionuclides
    density
    fusion crust
    magnetic susceptibility
    meteorite
    meteorite age
    meteorite fall
    mössbauer spectroscopy
    noble gas
    ordinary chondrite
    organic matter
    parent body
    porosity
    primordial radionuclides
    thermophysical properties
    troilite thermometer
    Opis:
    The Sołtmany hammer meteorite is classified as an ordinary chondrite type L6, W0, S2. At present it is the most thoroughly and comprehensively examined Polish meteorite. A comprehensive petrological, mineralogical and geochemical analysis alongside the investigation of its physical and particularly thermophysical properties, and, most of all, analyses of cosmogenic radionuclides and noble gases isotopes content, as well as the use of a troilite thermometer has made it possible to draw interesting conclusions concerning the genesis and evolution of the parent body and the history of the parent meteoroid and, finally, the Sołtmany meteorite. The present report attempts at summing up the results of studies conducted at several European research centres in the last four years. The age of the the Sołtmany chondrite parent rock has been defined at 4.137 billion years. It was formed at a temperature of up to 440–450 K (about 170°C), probably at a depth of up to 3 to 7 km under the surface of the parent body, i.e. at a pressure of the order of 1–2.4 kbar. Such a low temperature during the accretion, diagenesis and metamorphism of the parent body may point to its complicated development, which may be in part due to collisions of partially melted planetesimals. Like with other type L ordinary chondrites, one can infer that the parent body could have been destroyed about 467 million years ago, at the time of a catastrophic collision which led to the formation of Gefion family of planetoids. Perhaps one of the bodies in this family was involved in another collision about 29.2 million years ago, which resulted in ejecting the parent meteoroid of the Sołtmany chondrite onto the Earth collision trajectory. Before entering the Earth’s atmosphere, this meteoroid had the mass of about 36 kg and the diameter of ca 13.5 cm. During its flight through the atmosphere, it rotated and somersaulted, which resulted in the formation of an uniform thin (0.5–0.7 mm) fusion crust, whose temperature reached 1000°C. In the last phase, the Sołtmany meteorite fell almost vertically and its mass was a mere 3% of the mass of the parent meteoroid – 1.066 kg. It hit the roof and then the concrete stairs of a farm building, which caused it to break into two bigger and many small pieces. It was found a few minutes after the fall, which occurred at 6:03 a.m. (CEST, UTC+2:00) on 30 April 2011, by Wydmińskie Lake in northern Poland (54°00,53’N, 22°00,30’E). The Sołtmany chondrite is one of just 14 meteorites in which the activity concentration of the cosmogenic 52Mn has been determined, and one of the few ordinary chondrites where the concentration of organic matter has been defined. As a result, it was found out that unlike in carbonaceous CI chondrites, the composition of organic particles is dominated by less complex compounds (CHO and CHOS) than CHNO and CHNOS compounds. This may indicate the decomposition of more complex organic compounds into particles with simple structures during magmatic and metamorphic processes related to formation of type L ordinary chondrites.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2016, 7; 93-122
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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