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    Wyświetlanie 1-6 z 6
    Tytuł:
    Kratery meteorytowe na Marsie
    Meteorite Craters on Mars
    Autorzy:
    Hurnik, Hieronim
    Powiązania:
    https://bibliotekanauki.pl/articles/1032712.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Mars
    craters
    meteorite
    meteorites
    Opis:
    Meteorite craters, volcanoes and deep valleys are main obiects of Mars topography. The are many tausend or millions of craters and they are very different, with diameters of only centimeters to big basins with diameters of 25oo kilometers. The age of oldest craters on Mars is about 3,9 billions year.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 40-56
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identyfikacja kraterów uderzeniowych ze względu na rodzaj środowiska
    Identification of impact craters due to the environment
    Autorzy:
    Brachaniec, Tomasz
    Brom, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1033025.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    craters
    impact structures
    shock metamorphism
    Opis:
    It seems that the only correct way to identify impact craters is a combination of theoretical analysis, visual observation and experimental analysis, which are inextricably linked to the environment in which the crater was formed. Undoubtedly, the shock metamorphism is an essential diagnostic tool for the identification of the crater. The depth of water is a major problem in the formation of the marine craters.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2015, 6; 26-33
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Początki badań impaktów
    Beginnings of impacts research
    Autorzy:
    Brachaniec, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1032957.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    craters
    geology
    impacts
    meteorites
    research
    Opis:
    Impacts geology is a multi-disciplinary science, focus aspects of meteoritics, astronomy, petrography, geochemistry, structural geology, sedimentology and geophysics. The first studies of craters began in the 60s. Significant events in the development of this science were: the first research of the Cosmos, development of mineralogical and geochemistry analysis and important papers. Significant progress in the development of research studies reflect the number of newly discovered craters. Many aspects associated with them, such as dating, strewnfields, water impacts are still fairly problematic.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2013, 4; 9-21
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza cech impaktu ukośnego na przykładzie struktur Porządzie, Jaszczułty i Ochudno
    Analysis of oblique impact features. A case study of Porzadzie, Jaszczulty and Ochudno structures
    Autorzy:
    Walesiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1033069.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    asymmetry
    cardioid
    craters
    ejecta
    experiments
    impact structures
    oblique
    Opis:
    It’s considered that one half of all projectiles are striking surface of planets at the angle lower than 45°. Our knowledge of oblique impact events is based on computer modelling, laboratory experiments and observation of craters on the Moon, Mars, Venus and other celestial bodies. Recent discovery in northeast Poland, reveals at least four structures with features reserved for low-angle impacts. In this article we show and explain them using high-quality laser air scanning data (LiDAR) in comparison to results of experiments and similar real known objects on other planets. Also we try to verify by analyzing historical sources if multiple impact event could occur in our area and, if it was noticed and reported in the papers.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2016, 7; 151-176
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przegląd najważniejszych prac dotyczących próby ustalenia daty spadku meteorytów oraz wieku kraterów Morasko
    Review of most important papers regarding attempts to determine the date of Morasko meteorite fall and age of the craters
    Autorzy:
    Walesiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1830331.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    age
    craters
    dating
    fall
    luminescence
    meteorite Morasko
    palynological
    radiocarbon
    Opis:
    One of criteria suggesting impact origin may be recognition of extraterrestrial matter inside or around suspected cavities. In case of Morasko some dating results throw doubt on link between craters and meteorites. Conclusion of some past research papers was that cavities were formed about 5 ka BP (e.g. palynological investigation, luminescence dating), while more or less facts testify fall in the Middle Ages (e.g. “young” charcoal pieces in crust of meteorites or shrapnel stuck in the roots of old tree). In this paper we perform comprehensive analysis of each result and check if there exists alternative explanation. During past palynological investigation, there were examined two craters. It was concluded that beginning of accumulation of sediments in smaller cavity started 5500–5000 BP. However, pollen spectrum for largest basin was different suggesting younger age. The problem is that according to bathymetric maps, samples could be collected from inner uplift (similar feature was observed inside Porzadzie and Jaszczulty, unconfirmed impact structures yet). If we compare profiles from craters with recent research (palynological study supported by radiocarbon dating) on sediments in Lake Strzeszynskie (6 km SW from Morasko) pollen spectrum seems to be similar more to results dated to <1000 BP. Especially percentage of non-arboreal pollen for both examined Morasko craters is much higher (5 times greater than it was for layer dated to 5 ka BP in Lake Strzeszynskie). Possibility of short disturbance (related to impact) cannot be excluded, but in such case any time of event should be taken into account. For small lakes (like those filling the craters) also local conditions could play important role. Analysis of luminescence dating may also discuss past conclusions. OSL method applied for samples taken from the thin layer of sand in the bottom of largest structure (under 3,9 m of organic sediments filling the crater) suggested age 5–10 ka BP for 24 aliquots. Same number of samples (24) revealed age 0–5 ka BP (13 samples with age <3 ka BP including several younger than 1 ka BP). Older dates can be explained by partial or even no zeroing, but last contact with light (zeroing signal) of sand grains (excavated from depth of almost 4 meters under organic matter) seems that might occur only during (or shortly after) the impact. It is difficult to find convincing arguments, which can undermine initial radiocarbon dating giving age <1 ka BP for 7 of 9 samples taken from the bottom layer of organic sediments from three Morasko craters. Same issue may exist with small charcoal pieces with age <2 ka BP (and several dated to ~700 BP) discovered deep in sinter-weathering crust of meteorites. Study of charcoal particles excluded their origin during post-sedimentary processes (like forest fire) unless meteorite fragments were laying directly on the surface for period between impact and wildfire (surviving whole time inhospitable climate conditions). There are two other possible explanations of charcoals. Either they were present at location as a result of past forest fire or they were produced during impact. However, similar small charcoal pieces were discovered around many craters (Kaali, Ilumetsa, Campo del Cielo, Whitecourt) and they were successfully used to estimate maximum age of those structures. During second stage of 14C dating the age obtained from three samples (taken few centimeters above the mineral bottom) was estimated ~5 ka BP. Looking for answer why these results are so different from previous once there may be mentioned at least two options. Lake sediments is difficult matter for radiocarbon dating and results may be hundreds or even thousands years older than real age. Second explanation may be that older matter (remnant of trees, paleosoil etc.), distributed around craters during impact, could be displaced by wind, rain, erosion and trapped in the bottom of cavities. The argument, which may be also against hypothesis of impact ~5 ka BP is meteorite shrapnel stuck in the roots of old tree. Result of expertise showed, that there exists mechanical damage in the wood and the only possible explanation is that meteorite has hit living tree. Maximum age, that this type of wood may preserve (inside building) is 1,8 ka while in natural environment not more than 500 years. Anyway some further examinations should be performed. The age obtained during AMS 14C dating of 2 samples from thin layer of paleosoil, discovered under overturned flap around largest Morasko crater, was ~5 ka BP. Observation that preserved layer of paleosoil is approximately 3 times thinner than thickness of modern soil may lead to conclusion that during impact top (younger) layer of organic sediments was removed and only older part “survived” in few locations close to the rim. The conclusion of the research was that dating provides maximum age of the impact (which does not exclude much younger impact <1 ka BP) so could be considered as right explanation of past discrepancies.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2021, 12; 129-148
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kratery Morasko w świetle wiedzy na temat ukośnych impaktów
    Morasko craters base on knowledge related to oblique impacts
    Autorzy:
    Walesiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1033091.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko meteorite
    asymmetry
    craters
    ejecta
    oblique impact
    penetration funnels
    strewnfield
    Opis:
    It is considered that The Morasko meteorite shower happened about 5400 years BP with a trajectory from NE to SW (Bronikowska et al. 2015). Recent studies not only prove that this fall could be observed in Februrary 14, 1271, but also that location of most findings in the area to the east side of the craters, should not be taken as the main indicator of impact direction. The proper answer can be given base on knowledge related to oblique impacts, supported by understanding of complicated fragmentation process. The largest crater in Morasko Meteorite Restricted Area has main ejecta plume located in SE, side walls in SW and NE, and free of ejecta Zone of Avoidance (ZoA) in NW. This clearly shows that impact trajectory was approximatelly from NW to SE. There were also discovered other structures, 2 km North from Restricted Area, having common features. Their ejecta plumes as well as few raised ducts (possible traces of underground penetration) are directed to SE, pointing the largest structure – Umultowskie Lake, located approx. 2 km ESE from known main Morasko crater. Shapes of cavities, their walls and ejecta asymmetry allow estimating trajectories and defining new Morasko strewnfield, which matches not only location of impact strucures and discovered meteorite fragments, but also explains smaller (3–4 kg) findings in the neighborhood of Oborniki Wielkopolskie.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2017, 8; 149-168
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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