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    Wyświetlanie 1-9 z 9
    Tytuł:
    Nowy chondryt z Libii
    New chondrite from Libya
    Autorzy:
    Abu Anbar, Mohamed
    Kryza, Ryszard
    Przylibski, Tadeusz A.
    El Bahariya, Gaafar
    Powiązania:
    https://bibliotekanauki.pl/articles/1032649.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    meteorite fall
    meteorites
    ordinary chondrite
    Opis:
    On Saturday, 21 of May, 2006, a fall was observed and the stony meteorite was found in a small crater on an apple farm at Werdama village, near Al Beda town in Libya. Based on preliminary examinations, the authors described the meteorite as an ordinary chondrite. Further research aiming at full characteristics, classification and registration of the meteorite is in progress.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 9-12
    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:
    Aktualny stan badań nad meteorytem Morasko
    Autorzy:
    Muszyński, Andrzej
    Karwowski, Łukasz
    Kryza, Ryszard
    Pilski, Andrzej S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032812.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko meteorite
    meteorites
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 191
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klasyfikowanie chondrytów zwyczajnych – kolejność prac, metody badań, sprawy formalne i inne problemy
    Autorzy:
    Przylibski, Tadeusz A.
    Kryza, Ryszard
    Pilski, Andrzej S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032862.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    meteorite classification
    meteorites
    ordinary chondrite
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 195-196
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania chemiczne deszczu meteorytów żelaznych Jankowo Dolne-Morasko-Przełazy
    Autorzy:
    Pilski, Andrzej S.
    Karwowski, Łukasz
    Kryza, Ryszard
    Muszyński, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1032950.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Jankowo Dolne meteorite
    Morasko meteorite
    Przełazy meteorite
    iron meteorites
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2012, 3; 157-158
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pierwiastki syderofilne w meteorytach Morasko
    Siderophile elements in the Morasko meteorites
    Autorzy:
    Pilski, Andrzej S.
    Kryza, Ryszard
    Wasson, John T.
    Muszyński, Andrzej
    Karwowski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1032939.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Jankowo Dolne
    Morasko
    Seeläsgen
    iron meteorites IAB
    meteorites
    siderophile elements
    Opis:
    Sixteen specimens of the Morasko, one specimen of Seeläsgen and one specimen of Jankowo Dolne irons were analyzed with INAA to determine contents of 14 siderophile elements. The samples selected for analyses have their structures described and the presence or absence of cohenite checked. For preliminary interpretation, we have chosen elements determined with highest accuracy: Co, Ni, Ga, As, Ir and Au. The results are shown in tables and diagrams. It has been found that there are no significant differences in composition between fragments with and without cohenite. The observed low contents if iridium are not accompanied by lower contents of elements showing similar behavior during crystallization: platinum and tungsten, which suggests that fractional crystallization was not the reason of lower iridium content. Similar concentrations of elements have been found in all the Morasko specimens, and in the Seeläsgen and Jankowo Dolne irons, which suggests that all these meteorites come from one iron shower.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2012, 3; 62-70
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowe znaleziska w rezerwacie „Meteoryt Morasko”
    New finds in the reserve „Metorite Morasko”
    Autorzy:
    Muszyński, Andrzej
    Pilski, Andrzej S.
    Karwowski, Łukasz
    Kryza, Ryszard
    Gurdziel, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1032983.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko meteorite
    meteorites
    meteoryt Morasko
    new find
    nowe znaleziska
    rezerwat
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2013, 4; 136-138
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowy chondryt zwyczajny L6, S1, W1: Northwest Africa 11779
    A new ordinary chondrite L6, S1, W1: Northwest Africa 11779
    Autorzy:
    Przylibski, Tadeusz A.
    Łuszczek, Katarzyna
    Kryza, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1033133.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    L6 chondrite
    NWA chondrite
    bulk chemistry
    chemistry of minerals
    meteorite
    ordinary chondrite
    Opis:
    Based on petrological, mineralogical and geochemical research authors classified new meteorite Northwest Africa 11779 as the ordinary chondrite L6, S1, W1. Chemical composition of olivine crystals (Fa 24.9 mol.%) and of pyroxene crystals (Fs 19.4 mol.%) proved that this meteorite belongs to L chondrites. However, bulk chemical composition of NWA 11779 is not typical for L chondrites. Nevertheless, all analyzed elements (except Mo, Sn and Nb) are in abundances reported for L chondrites, some of elements have concentration closed to average abundances for L chondrites. The content of chosen, characteristic lithophile, siderophile and chalkophile elements in NWA 11779 chondrite is in most cases in accord with its typical abundance in L chondrites. Presence of poorly defined chondrules, secondary feldspar crystals larger than 50 µm in size, absence of glass within chondrules, coarse recrystallized matrix (with olivine crystals of 0.5 mm in diameter and pyroxene crystals of 0.3 mm in diameter) as well as carbon content below 0.2 wt% proved that studied meteorite belongs to the petrologic type 6. The only difference from characteristic features of petrologic type 6 in case of NWA 11779 chondrite is presence of ca. 10% of monoclinic Ca-poor pyroxenes. Undulatory extinction by olivine and absence of other shock features in this chondrite allow to determine the shock level as S1. Weathering grade of NWA 11779 was identified as W1 based on weathering of only FeNi alloy grains. The outer part of metallic grains as well as contact zones of FeNi and FeS are changed due to weathering. Between 10 and 20% of FeNi alloy grains are oxidized to iron oxides and hydroxides. These secondary products of weathering replace outer zone of FeNi grains and fill the small cracks, creating a few thin veins.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2019, 10; 121-139
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowy chondryt zwyczajny H5, S2, W1: Northwest Africa 11778
    A new ordinary chondrite H5, S2, W1: Northwest Africa 11778
    Autorzy:
    Przylibski, Tadeusz
    Łuszczek, Katarzyna
    Kryza, Ryszard
    Blutstein, Konrad
    Powiązania:
    https://bibliotekanauki.pl/articles/1033153.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    H5 chondrite
    NWA chondrite
    bulk chemistry
    chemistry of minerals
    meteorite
    ordinary chondrite
    Opis:
    Based on petrological, mineralogical and geochemical analyses, the authors classified the new meteorite Northwest Africa 11778 as an ordinary chondrite H5, S2, W1. It is a single stone with mass 767.5 g and with well-preserved black fusion crust with brown shade (Fig. 1). This meteorite was found in Sahara Desert and it was purchased by Wroclaw University of Science and Technology, Faculty of Geoengineering, Mining and Geology from Moroccan dealer in Zagora in June 2013. The most characteristic component of analyzed chondrite are different types of chondrules (barred olivine – BO, porphyritic olivine – PO, granular olivine – GO, radial pyroxene – RP, porphyritic olivine-pyroxene – POP, cryptocrystalline – C) (Fig. 2), which constitute 75% of meteorite. Their size is in range 0.2–1.2 mm, with average chondrule size ca. 0.6 mm. Bigger porphyritic olivine chondrules with diameter up to 1.5 mm rarely occur. The chemical composition of olivine crystals (Fa 18 mol%) and pyroxene crystals (Fs 16.2 mol%) proves this meteorite to be an H chondrite (Tab. 1, Fig. 4–5, App. 1–2). The averaged concentration of major elements in the classified meteorite is comparable to their mean content in H chondrites (Fig. 8). The meteorite NWA 11778 contains only slightly less Mg and Al than average H chondrites (Tab. 2). Among the other analysed elements, values distinctly out of the range of typical concentrations for H chondrites are characteristic of Hg and Eu (lower concentration in the NWA 11778 meteorite) (Tab. 3, Fig. 8–9). The presence of chondrules with predominantly sharp boundaries (Fig. 2), secondary feldspar crystals with sizes of up to 50 mm, chiefly crystalline mesostasis and only secondarily – devitrified glass in chondrules, and transparent crystalline matrix (with olivine crystals up to 0.26 mm and pyroxenes up to 0.30 mm in size), as well as common occurrence of untwinned rhombic pyroxenes prove the classified meteorite to belong to petrological type 5. It is additionally confirmed by mean Ni content in troilite below 0.5 wt% (0.04 wt%) (Tab. 1, App. 4) and carbon content below 0.2 wt% (0.07 wt%) (Tab. 2). Undulatory extinction in some olivine and pyroxene crystals and the presence of irregular fractures in the NWA 11778 chondrite enables specifying its shock level as S2. The weathering grade adopted for the NWA 11778 chondrite was W1, as visible weathering changes cover only the marginal parts of FeNi alloy grains. As a result of the weathering of 10–20% of FeNi grains, iron oxides and hydroxides are formed. These secondary weathering Fe3+ compounds also fill cracks, forming veins running between chondrules within matrix (Fig. 3).
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2020, 11; 77-97
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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