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    Wyświetlanie 1-9 z 9
    Tytuł:
    Patyna na skałach podłoża oraz blokach piramid w Giza i Abu Roasz, Egipt
    Patina present on the base rocks and blocks of the pyramids from Giza and Abu Rowash, Egypt
    Autorzy:
    Zalewski, Franc
    Powiązania:
    https://bibliotekanauki.pl/articles/1032699.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    mineralogical research
    Abu Rowash
    Egypt
    Giza
    meteorite crater
    Opis:
    The hill of Abu Rowash is situated on the edge of the Western Desert at the southern end of the Nile Delta about fifteen kilometers North West from Cairo where a cone-shaped pit of roughly is located. In the central part of the area, the measured diameter of the structure is up to 30 meters and the deep is up to 15 meters, respectively. Both the size and the shape of the object could indicated its impact origin. The samples of calcareous rocks which were collected from the central part of the crater and from the base have been examined both, in the University of Science and Technology in Cracow and the Jagiellonian University laboratories. Analyzed rock samples were classified as an organogenic micrite-sparite limestone. Some clasts commonly represented by shells from the inner walls of the crater, reflect traces of a shock wave. The another fossilized shells which are presented in the epicentral part of the crater has dark, macroscopic well-observed inclusions. The surrounding rocks of the crater have numerous fractures in the less metamorphosed layers. The border zone observed in thin sections is developed as an amorphous layer. The SEM-EDS analysis affirmed that the transparent coating is carbon (C) which is separated from the limestone by a thin layer of sulfates. A more detailed analysis of the sulfates between the calcitedolomite rock and the layer of carbon revealed the presence of the mettalic iron. The results of the investigation confirm the hypothesis about the craters being formed as a result of an impact by some extraterrestrial matter. Patina present on the rock was probably formed during the high temperature process. The above conditions could be a result of the impact of meteorite, which contained metallic elements and high amounts of graphite.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 161-168
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Kaali crater field and other geosites of Saaremaa Island (Estonia): the perspectives for a geopark
    Autorzy:
    Raukas, Anto
    Stankowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/94342.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    geopark
    geosites
    meteorite-crater field
    Saaremaa Island
    Estonia
    geostanowiska
    Opis:
    The Island of Saaremaa in Estonia offers highly spectacular geological features that belong to the most interesting in the Baltic Sea area. A unique geological monument on the island is the Kaali meteorite-crater field, formed by nine meteorite impacts. There are also attractive coastal cliffs, huge erratics, alvars (limestone areas covered by a very thin soil) and well-developed glacial and marine landforms. Limestone cliffs and shingle beaches abound with Silurian fossils and offer great opportunities to fossil collectors. The island is a prospective geopark. During the past few years, the geology of the island has become an intensely studied object of Estonian and Polish geologists.
    Źródło:
    Geologos; 2010, 16, 1; 59-68
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomitologia kraterów kolizyjnych i zjawisk impaktowych
    Geomythology of the meteorite craters and cosmic collisions
    Autorzy:
    Telecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075659.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    krater meteorytu
    wulkan
    geomitologia
    religie
    meteorite crater
    volcano
    geomythology
    religions
    Opis:
    Meteorite craters are unique, and sometimes distinctive sites whose formation was accompanied by catastrophic events. That could not have gone unnoticed by people who try to explain the circumstances and causes of crater formation. This article presents meteorite craters in religions and oral stories (geomythology), which accurately interpret theseforms and phenomena. All stories (except present myths) indicate that the authors of geomyths had an exceptional perceptiveness and ability to draw logical (in their state of the art) conclusions, often many years before cosmically origin of crater was scientifically explained.
    Źródło:
    Przegląd Geologiczny; 2017, 65, 7; 427--431
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meteorytowy krater Mjølnir na Morzu Barentsa w interpretacjach stratygraficznych
    The meteorite Mjølnir crater in the Barents Sea in stratigraphical interpretations
    Autorzy:
    Wierzbowski, A.
    Grabowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075086.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    meteorite crater
    ejecta
    stratigraphical correlations
    Jurassic-Cretaceus boundary
    meteorytowy krater
    korelacja stratygraficzna
    pogranicze jury i kredy
    Opis:
    The Mjølnir submarine crater attaining about 40 kilometers in diameter on the Barents Shelf is one of the largest meteorite craters in the World. It was formed in the earliest Ryzanian as proved by the ammonite datings of the ejecta bearing strata in the boreholes in the Barents Sea. The iridium anomalies related to that impact were recognized also on central Spitsbergen, and in Nordvik Peninsula of northern Siberia . The Mjølnir impact resulted in a large scale reworking and redeposition of sediments in the Boreal Sea across the Late Volgian and Ryazanian transition as documented e.g. in a close neighbourhood of the crater, but also in more distal successions in central Spitsbergen. So far, no unequivocal proof of this event was documented in more southern areas in Europe, but the detailed studies of complete successions in the nonmarine Purbeck-type facies in north-western and central Poland seem to be promising in this respect. This could allow for correlation of the Boreal ammonite subdivision with that based on the ostracodes. The palaeomagnetic studies of the continuous succession in the Nordvik Peninsula section of the uppermost Upper Volgian and Lower Ryazanian yielded also new information on the correlation between the Boreal and the Mediterranean biostratigraphical zonal schemes which is especially importantfor recognition of the uniform Jurassic-Cretaceous boundary in the World. The recent results of these studies indicate that the Mjolnir impact took place during magnetozone 17 r which suggests the correlation of that event with the boundary of the Jacobi and Occitanica ammonite zones corresponding to the boundary of the Lower and the Middle Berriasian of the Mediterranean domain. This confirms an opinion that the Volgian-Ryazanian boundary of the Boreal domain is placed much higher than the Tithonian-Berriasian boundary in the Tethyan domain - treated as a main candidate level for the uniform Jurassic-Cretaceous boundary in the World.
    Źródło:
    Przegląd Geologiczny; 2013, 61, 9; 516--522
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Batymetria jezior meteorytowych w rezerwacie „Meteoryt Morasko”
    Bathymetry of crater lakes in the “Meteoryt Morasko” reserve
    Autorzy:
    Choiński, Adam
    Ptak, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1033077.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Morasko
    crater
    impact
    lakes
    meteorite
    Opis:
    The paper presents results of bathymetric measurements performed on three crater lakes located in the “Meteoryt Morasko” reserve in west Poland. The maximum depth of the largest of the analysed lakes (1695 m2) was determined to amount to 2.6 m. The parameters of the lake (surface area, depth, etc.) are largely determined by a ditch dug through the crater in the north-western part of the lake, affecting the maximum water volume accumulated in the lake.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2017, 8; 23-29
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Imilchil meteorite strewn field and Isli-Agoudal craters
    Autorzy:
    Nachit, H.
    Ibhi, A.
    Vaccaro, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/411597.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Meteorite
    strewn field
    Isli
    Agoudal
    Impact crater
    Morocco
    Opis:
    New meteorite prospections at different places in the region of Imilchil showed that (1) besides the Ataxite of Tasraft all the other collected specimens belong to the same and only IIAB iron mother meteorite (2) the strewn field of the meteorite has a length of about 38 km into north-south direction (3) the small crater of Agoudal as well as the impact crater of Isli are situated on a parallel north-south axis, if not put together with the strewn field of the Imilchil meteorite (4) these two structures might be the result of the fall of the same and only mother meteorite of the IIAB type.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 11; 65-71
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka petrograficzna skał pochodzących ze struktury impaktowej Gardnos, Norwegia
    Petrographic charctersitics of the rocks from the impact structure Gardnos, Norway
    Autorzy:
    Jarmołowicz-Szulc, K.
    Ilcewicz-Stefaniuk, D.
    Stefaniuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061826.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    meteoryt
    krater
    brekcja impaktowa
    suevit
    Gardnos
    meteorite
    crater
    impact breccia
    suevite
    Opis:
    Krater meteorytu Gardnos znajduje się w Norwegii, ok. 125 km na północny zachód od Oslo. Cała struktura jest dobrze widoczna w terenie dzięki licznym odkrywkom brekcji impaktowych i utworów poimpaktowych występujących w okręgu o promieniu ok. 5 km. Główne typy skał impaktowych w rejonie krateru Gardnos to autochtoniczna brekcja z Gardnos oraz przykrywająca ją allochtoniczna brekcja impaktowa (suevit). W artykule omówiono petrografię tych skał. Brekcja z Gardnos jest brekcją lityczną, złożoną ze spękanych fragmentów skał, ale nie zawiera fragmentów stopu. Suevit jest brekcją polimiktyczną, zawierającą małe fragmenty zrekrystalizowanego stopu z klastami skał i minerałów.
    The crater of the Gardnos meteorite is located in Norway, about 125 km north-west of Oslo. The structure is well seen due to the outcrops of impact breccias and post-impact deposits that form a circle with a radius of about 5 km. Main types of the impact rocks in the Gardnos area are the autochthonous Gardnos breccia and its cover – allochthonous suevite breccia. The petrological characteristics of these rocks are presented. The Gardnos breccia is a lithic breccia, composed of fissured rock fragments, without melt components. The suevite is a polymictic breccia, built of small fragments composed of recrystallized melt and clasts of rocks and minerals.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2015, 464; 43--48
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    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:
    Meteoryty, kratery uderzeniowe i inne ślady kosmicznej katastrofy w rejonie Moraska pod Poznaniem
    Meteorites, impact craters, and other traces of a cosmic disaster at Morasko near Poznań
    Autorzy:
    Szczuciński, Witold
    Muszyński, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2076071.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    krater uderzeniowy
    meteoryt
    depozyty wyrzucane
    Holocen
    Polska
    impact crater
    meteorite
    ejecta deposits
    Holocene
    Polska
    Opis:
    About 5,000 years ago near Morasko (the district of the present-day city of Poznań, western Poland) the largest known iron meteorite shower in Central Europe took place. The evidence of that impact, documented so far, comprises numerous iron meteorite fragments distributed over an area of approximately 3 km2 and at least six meteorite impact craters with a maximum diameter of about 100 m. The present paper reviews the most recent findings related to the meteorite, craters, processes of their formation, as well as the environmental effects of the impact in the Morasko area. The most important findings, reported in this review cover: 1) the recognition of two new minerals in the meteorite: moraskoite and czochralskiite; 2) the identification and detailed analysis of the ejecta layer around the craters and underlying paleosoil providing evidence for the mid-Holocene age of the impact; 3) the numerical modelling constraining the range of likely physical properties of the impactor, e.g. the diameter of the projectile forming the largest crater and its landing velocity (c. 1.5 m and 10km/s, respectively);4) the studies of the nearby lake and peat deposits revealing restricted environmental effects of the impact. The Morasko craters field is currently one of the best-studied examples of small/moderate-sized meteorite impact in unconsolidated sediments.
    Źródło:
    Przegląd Geologiczny; 2020, 68, 8; 637--644
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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