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    Wyświetlanie 1-12 z 12
    Tytuł:
    Zastosowanie neutronowej analizy aktywacyjnej NAA do identyfikacji materii pochodzenia kosmicznego na Ziemi
    Application of Neutron Activation Analysis for identification of cosmic matter on Earth
    Autorzy:
    Tymiński, Zbigniew
    Mysłek-Laurikainen, Bogumiła
    Powiązania:
    https://bibliotekanauki.pl/articles/1032679.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    NAA
    classification of meteorites
    impact craters
    meteorites
    neutron activation analysis
    neutrons
    γ spectrometry
    Opis:
    Neutron activation analysis (NAA) is an analytical method based on the measurement of characteristic radiation from radionuclides formed by neutron irradiation of the material of interest. The most suitable source of neutrons for NAA is a research reactor. The neutron activation analysis has been found to be extremely useful in the determination of trace and minor elements in geological and extraordinary samples. The method is non-destructive, giving many advantages, which are described. Measured abundances of the elements in meteorites, from major constituents down to those appearing only in trace amounts, provide information important for the theories of the origin and history of the Solar System.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 97-100
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Wybuchowe kratery meteorytowe
    Explosive Craters of Meteorites
    Autorzy:
    Kosiński, Janusz W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032722.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    explosive craters of meteorites
    impactites
    shock changes
    Opis:
    The article contains the description of the most important features of explosive craters of meteorites.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 78-84
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Empiryczne dowody wielkiego bombardowania (LHB) na Księżycu na podstawie danych zaczerpniętych z Geologicznego atlasu Księżyca
    Autorzy:
    Telecka, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/763126.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Moon
    Large Heavy Bombardment
    meteorite craters
    dating of lunar craters
    lunar stratigraphy
    Księżyc
    wielkie bombardowanie
    datowanie kraterów księżycowych
    stratygrafia Księżyca
    Opis:
    Lunar cratering chronology is a basis for chronology of meteorite impacts on Mars, Earth and on the other terrestrial planets. Moon is a calibration plate for cratering record for all inner solarsystem. There are two methods of preparing lunar flux curve: theoretical size-frequency distribution (SFD) proposed by Neukum et al. (2001) and empirical, based on the samples collected by thespace probes Apollo and Luna. In this paper I checked empirically SFD method based on two maps: Geologic Map of the North Side of the Moon (1978) and Geologic Map of the South Side of the Moon (1979) collected in the Geologic Atlas of the Moon. There was count all craters dated on the each of the lunar stratigraphic units.Boundaries of the lunar geologic units are related to impact structures and lava flows. The most problematic is the age of these forms. Most of the known ages of the lunar basins and craters which are the limits of the stratigraphic units (Nectaris, Imbrium and Orientale basins and Copernicus crater – Table 1) were compared in this paper. If the number of craters in the lunar geological period is constant, duration of the geological units affects the diagram of the impact flux (Fig. 3–8). The period with the most intensive frequency of meteorite collisions is called Large Heavy Bombardment (LHB), but, as we see on figures 3–8, it changes depending on the used data. The length and boundaries of LHB period is a clue to understanding of early evolution of terrestrial planets and inner solar system.
    Artykuł nie zawiera abstraktu w języku polskim
    Źródło:
    Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia; 2013, 68, 2
    0137-1983
    Pojawia się w:
    Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia
    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:
    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:
    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:
    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
    Tytuł:
    Jak powstały Kratery Morasko? Rewizja istniejących poglądów dotyczących genezy zagłębień w rezerwacie pod Poznaniem
    How the Morasko craters were formed? The revision of existing opinions regarding the formation of depressions in the reserved area near Poznan
    Autorzy:
    Bronikowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1033098.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    impact craters
    iron meteorite
    strewn field
    Opis:
    Althought the first Morasko meteorite has been found over 100 years ago, the discussion about the Morasko strewn field and cratersis is still ongoing. In this paper, the revision of existing opinions on the Morasko craters formation and origin is conducted regarding to numerical modeling results and current knowlage about impact cratering procssess.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2018, 9; 30-41
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kratery Morasko – obrona hipotezy ukośnego impaktu w kontekście dostępnej wiedzy i wyników badań
    Morasko craters – in defense of oblique impact origin based on knowledge and research
    Autorzy:
    Walesiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1830330.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    bilateral symmetry
    crater field
    elliptical craters
    forbidden zone
    meteorite Morasko
    oblique impact
    Opis:
    Over 2 years ago there was published an article (Bronikowska 2018a) challenging some results of research related to Morasko meteorite fall. Those results are huge problem for scientists who are not able to explain them using simplified models and maybe do not want to admit that some assumptions should be verified and redefined. One of hypothesis discussed in the paper was article manifesting that Morasko craters were created during oblique impact (Walesiak 2017) and that initial trajectory can be estimated by elongation of almost all cavities, their bilateral symmetries according to longer axis and observed asymmetries of rims. By comparison to Campo del Cielo craters Walesiak suggested that impact angle could be very shallow (10–20°), as ellipticity of all smaller Morasko structures is approx. 1,3. Further analysis of topography in neighborhood of Morasko revealed that there may exist more impact craters around this area, which may explain discovery of two iron meteorites near Oborniki village (17 km NW from Meteorite Morasko Restricted Area), unfortunately lost during World War II. In fact, Bronikowska confused definitions “oblique impact” and “elliptical craters”, what can be supported by given references (Elbeshausen et al. 2009) confirming Walesiak hypothesis. Unfortunately, this misunderstanding touches also another article of this author (Bronikowska et al. 2017), where obliquity was neglected. However, estimated during that modeling pre-impact angle (30–43°), according to known definitions written in many publications, should be classified as oblique impact. All elongated craters, as well as morphology of the largest structure in Meteorite Morasko Restricted Area suggest impact from NW while during reconstruction of meteoroid parameters Bronikowska assumed impactor coming from NE (based on existing strewn field). Considering not clear relation between meteorites and craters (e.g., lack of findings in cavities, relatively poor number of shrapnel fragments around structures and possibility that craters may be much older than fall of meteorites), it may be not enough reliable justification. Even if relation exists, example of Whitecourt (with distribution of meteorites downrange), compared with abundance of Morasko shrapnel fragments collected hundreds of meters NE from Restricted Area, undermines parameter used in modelling. Also, single fragmentation is doubtful, concluded after unreasonable omitting known craters outside Restricted Area (e.g., crater no 8 described by Pokrzywnicki (1964) and structure no 9 mentioned by Hodge (1994)). Finally, use of iSALE-2D shock physics code (valid for vertical impacts only) for modelling of elliptical craters formed during highly oblique impact (angle lower than 12°), even considering vertical component (which approximation is only applicable for impact into materials with a friction coefficient of about f=0,7 with no or very little cohesion) (Elbeshausen et al. 2009), also should not be considered as proper applied method leading to get valuable results. In this article there is proposed new strewn field definition for Morasko meteorite, based on elongation of all known and unconfirmed (yet) craters. Surprisingly, estimated (redefined) pre-impact trajectory gives convincing explanation for bilaterally symmetrical distribution of documented findings.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2021, 12; 108-128
    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
      Wyświetlanie 1-12 z 12

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