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Tytuł:
Mineralogiczne badania osadów wokół meteorytów na terenie rezerwatu „Meteoryt Morasko”
Autorzy:
Dziurdzi, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1032869.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Źródło:
Acta Societatis Metheoriticae Polonorum; 2011, 2; 179
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:
Porównanie wietrzenia meteorytów Pułtusk i Morasko
Autorzy:
Gurdziel, Agnieszka
Karwowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1032801.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Pułtusk meteorite
meteorites
Źródło:
Acta Societatis Metheoriticae Polonorum; 2011, 2; 182-183
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Co mówią wyniki badań mikrometeorytów z rezerwatu „Meteoryt Morasko”
Autorzy:
Dworzyńska, Magdalena
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1032947.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
meteorites
micrometeorites
Źródło:
Acta Societatis Metheoriticae Polonorum; 2012, 3; 155-156
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka ałtaitu z meteorytu Morasko metodą spektroskopii Ramana
Autorzy:
Runka, Tomasz
Karwowski, Łukasz
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1032954.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Raman spectroscopy
altaite
Źródło:
Acta Societatis Metheoriticae Polonorum; 2012, 3; 159-160
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogia wybranych próbek z otoczenia meteorytów w rezerwacie „Meteoryt Morasko”
Mineralogy of samples from the vicinity of finds of meteorite Morasko
Autorzy:
Bartosz, Zofia
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1032990.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
frakcja magnetyczna
meteorites
meteoryt Morasko
mikrometeoryty
Źródło:
Acta Societatis Metheoriticae Polonorum; 2013, 4; 131
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wietrzenie w meteorycie Nantan (porównanie wybranych wtórnych faz mineralnych z meteorytów Nantan i Morasko)
Weathering in the Nantan meteorite (comparison of selected secondary mineral phases of the Nantan and Morasko meteorites)
Autorzy:
Gurdziel, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1033030.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Nantan meteorite
secondary minerals
weathering iron meteorite
Opis:
The main products of terrestrial weathering of metallic phases in Nantan meteorite are represented by: goethite, lepidocrocite and others nonstructural Fe-hydroxides with differ hydratation ratio. Sometimes iron hydroxides are associated with high-nickel phases. Hydrated iron phosphates are observed like, e.g. vivianite, in vicinity schreibersite. Only phosphides, relics of taenite and the hight-nickel phases are preserved in strongly weathered specimens. Generally, both the process of weathering and the types of secondary phases are similar in Nantan and Morasko meteorites. The differences are very small and are caused by slightly different chemical composition of both meteorites.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2015, 6; 42-52
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wtórne zmiany w obrębie fosforków i węglików w meteorycie Morasko
The Secondary Changes of Phosphides and Carbides in Morasko Meteorite
Autorzy:
Gurdziel, Agnieszka
Karwowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1032705.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
meteorites
secondary minerals
weathered iron meteorite
Opis:
Weathering processes of minerals which are presented in the Morasko meteorite are characterized by different speed of the secondary changes. The most resistant minerals for the alternations are phosphites (schreibersite, rhabdite, nickielphosphide) and carbides (cohenite) but also the mentioned phases show secondary fluctuation. Phosphites are changing into metallic, phosphorus free phases, which are similar to native nickel or avaurite (awaruitu) with very well visible modification of its crystal morphology. All phosphorus amount is introduced to secondary phosphates like vivianite. The carbides alternation processes occur in a different way than in case of phosphates. Carbon is free to the environment up to time, when the new phase is totally decomposed and replaced by hydroxyoxide of iron. Sometimes, the high-nickel metallic phases are also noted as the products of the weathering. All described mineral phases, that are resistant for secondary alternation might be indicators for high evolved meteoritic material in the Earth’s weathered rocks.
Wietrzenie poszczególnych faz mineralnych, obecnych we fragmentach meteorytu Morasko, przebiega w różnym tempie. Za najbardziej odporne uznaje się fosforki (schreibersyt, rhabdyt, nickielphosphide) oraz węgliki (cohenit). Jednak po pewnym czasie również i te fazy ulegają rozpadowi. Z fosforków wyraźnie ubywa fosforu i przekształcają się one stopniowo w fazy metaliczne, zbliżone do taenitu lub awaruitu. Towarzyszy temu zmiana morfologii kryształów. Uwolniony fosfor wchodzi w skład wtórnych fosforanów typu wiwianit (vivianit). Węgliki zachowują się nieco odmiennie. Węgiel zostaje stopniowo uwalniany do środowiska a w dalszym etapie faza ta ulega całkowitemu rozpadowi przechodząc w wodorotlenki żelaza. Jednymi z ostatnich faz, które można dostrzec wśród wodorotlenków żelaza są wtórne fazy wysokoniklowe. Powyższe odporne na wietrzenie fazy, jako nieobecne na powierzchni Ziemi (z wyjątkiem krzemianów), mogą służyć identyfikacji meteorytowego pochodzenia silnie zwietrzałych skał.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2011, 2; 25-33
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:
Shock structures in the Morasko meteorite - preliminary SEM data
Autorzy:
Brachaniec, T.
Powiązania:
https://bibliotekanauki.pl/articles/100872.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:
shock
metamorphism
Morasko meteorite
dane SEM
metamorfizm
meteoryt Morasko
Opis:
This paper is a preliminary review of main shock deformations in the Morasko meteorite. Three main types of metamorphism structures occur in the investigated material: (i) brittle, (ii) plastic and (iii) thermal. Their interpretation may indicate, that Morasko meteorite reveals several stages of shock, eg.: extraterrestrial collisions and fall on the Earth.
Źródło:
Contemporary Trends in Geoscience; 2014, 3, 1; 1-4
2299-8179
Pojawia się w:
Contemporary Trends in Geoscience
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reevesyt i jarosyt – nowe wtórne fazy w meteorycie Morasko
Reevesite and jarosite – the new secondary phases in Morasko meteorite
Autorzy:
Gurdziel, Agnieszka
Karwowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1033049.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
jarosite
reevesite
secondary phases in iron meteorite
Opis:
Numerous investigations of Morasko meteorites, have so far identified many secondary mineral phases like: goethite, lepidocrocite, akaganeite, siderite, calcite, ankerite, awaruite, nickel native as well as vivianite. Recently studies on a new found meteorites Morasko, allowed the identification of more secondary minerals. They are represented by: aragonite CaCO3, chukanovite Fe2(CO3)(OH)2 and hellyerite (Ni[CO3]·6H2O) (Karwowski et al. 2011). More detailed analysis of the above phases revealed a new secondary phases, which are represented by: reevesite (Ni6Fe3+2CO3(OH)16·4H2O) as well as jarosite (KFe3+3(OH)6(SO4)2).
Źródło:
Acta Societatis Metheoriticae Polonorum; 2016, 7; 27-35
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania metalograficzne i mikroanalityczne meteorytu Morasko
Metallography and Microanalysis Study of the Morasko Meteorite
Autorzy:
Popławski, Mikołaj
Jóźwiak, Karol
Kachlicki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1032785.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
EDS
OM
SEM
TEM
meteorites
microstructure Morasko meteorite
Opis:
The following work is an attempt to characterize the microstructure of Morasko meteorite with the application of optical microscopy as well as transmission and scanning electron microscopy. Chemical composition was examined with EDS and OES methods. The occurrence of mechanical twins has been detected which is scarce in case of earthly a iron. The groundmass of the examined alloy constitutes a ferronickel (approx. 7% Ni) of A2 lattice. On the surface of metallographic microsection there can be seen Neumann bands and abundance of ferrophosphorus (Fe, Ni)3P.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2011, 2; 117-124
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:
Wietrzenie meteorytów Morasko i Pułtusk
Autorzy:
Gurdziel, Agnieszka
Karwowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1032656.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
Pultusk meteorite
meteorites
secondary minerals
weathered iron
weathering
Źródło:
Acta Societatis Metheoriticae Polonorum; 2009, 1; 28-34
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:
Dokumentacja znalezisk meteorytu Morasko w latach 2011–2014 : problemy metodyczne i uzyskane efekty
Documenting the Morasko meteorite finds in 2011-2014 : methodical problems and results obtained
Autorzy:
Nowak, Monika
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2076020.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
meteoryt Morasko
znaleziska meteorytów
dokumentacja meteorytów
pole zasypane
Morasko meteorite
meteorite findings
meteorite documentation
strewn field
Opis:
The Morasko meteorite is currently one of the biggest tourist attractions of the city of Poznań. In this paper we present the stages of creating documentation for finds of individual fragments of the Morasko meteorite, conducted at the Institute of Geology, Adam Mickiewicz University, in 2011-2014. During the initial period of documentary work, the focus was mainly on the compilation of topographic maps prepared by various authors to create one collective map of finds. ESRI (ArcGIS) software was used to prepare the documentation. The main problem at the initial stage of documentation was the coordination of source data prepared on topographic bases developed in various reference systems (PUWG 65, PUWG 92, tourist map without any system). During the years 2012-2014, topographic data were successively supplemented with new finds, resulting in a database comprising a total of 1413 items - containing coordinates, data on individual finders, masses (given as a range or as specific data in grams), depths at which meteorites rested, and, in some cases, special features (so-called shrapnel). The obtained documentation is a unique source of data on most of the fragments of the Morasko meteorite. It remains debatable whether the collected information is sufficient to calculate a reliable meteorite strewn field.
Źródło:
Przegląd Geologiczny; 2020, 68, 12; 879--885
0033-2151
Pojawia się w:
Przegląd Geologiczny
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:
Przynależność gatunkowa drzewa z rezerwatu przyrody „Meteoryt Morasko”, w korzeniu którego utkwił fragment meteorytu
Species of tree from the „Morasko Meteorite” nature reserve, in which root stuck a fragment of meteorite
Autorzy:
Socha, Krzysztof
Bednarz, Bartłomiej
Wąsik, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/1033009.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
European larch
Larix decidua Mill.
iron meteorite
meteorites
wood anatomy
„Morasko Meteorite” nature reserve
Opis:
The fragment of root with the stuck of meteorite, originated from the „Morasko Meteorite” nature reserve were analysed to determine the species of the tree. Based on the macro characteristics and microscopic preparation techniques, the anatomical features of analysed wood is presented. Besides the cross-section of place where the meteorite had lodged in and the depreciation degree of wood is taken into consideration to obtain the probability time of meteorite impact. It is concluded that the meteorite have to stabbed into the living European larch, therefore it is very probably that it had happened not earlier than about 200–300 years ago.
Poddany badaniom fragment korzenia wraz z wbitym weń meteorytem, pochodzącym z rezerwatu przyrody „Meteoryt Morasko”, został określony jako drewno modrzewiowe (Larix decidua Mill.). Zarówno stan zachowania drewna jak również jego stopień deprecjacji obok widocznego na przekroju poprzecznym, w miejscu utkwienia meteorytu, charakterystycznego przebiegu słojów rocznych, świadczących o podjęciu przez drzewo próby zabliźnienia rany, wskazują, że fragment meteorytu, który upadł na ziemię na obszarze obecnego rezerwatu przyrody „Meteoryt Morasko,” wbił się w żyjące drzewo modrzewia europejskiego. Miało to zatem miejsce najprawdopodobniej w okresie nie wcześniej niż około 200–300 lat temu.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2014, 5; 97-103
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jeszcze jedna dyskusja na temat daty spadku meteorytu Morasko
Another discussion about date of Morasko meteorite fall
Autorzy:
Walesiak, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1033089.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Morasko meteorite
bright meteor
cosmic catastrophy
dating
history of Wielkopolska
observed fall
Opis:
It’s over 100 years after discovery of the first iron meteorite in the area of Morasko, but still we are not sure about date of the fall. Recent researches suggest that it happened about 5000 years ago, however there are some other facts proving, that event took place in the last millenium. Verification o 14C radio carbon dating results revealed, that it can give us only the maximum date (meaning: not older than). The main problem was that probes were taken from mixed types of sediments – some created before and some after the impact. Few years earlier there was another 14C examination of sediments lying beyond the floor of 2 small cavities and their age was estimated to be approximatelly 700 years BP. Similar results were received after verification of organic matter under charcoal in the weathering crust of the meteorite, which was found in the Morasko Restricted Area. Another proof was discovery of shrapnel in the root of old tree, which could not be older than 800–1000 years. At least 2 times it was discussed, if finding of Morasko iron meteorites couldn’t be matched with described observation A.D. 1301, mentioned in annales, hovever nobody was able to prove it. Analysis of historical documents lead to information of appearance of 3 suns, after sunrise, what happened in 14 Feb. 1271. Further investigation of other sources gave us even more facts. We can read in annales that in the same year, castles and cities were burned and destructed to the ground. There is also information that Poznan, the largest city in the area (approx 7.5 km South from the Morasko), was burned in (or shortly before) the year of 1274. What is more Annales from Poznan and from its parent town Wielkopolska were finished in A.D. 1271, just in the middle of the sentence. Finally, confirmation is given by archeological researches, which tell us that city walls and castle of Poznan were ruined shortly after they were constructed, but scientists found difficulty to answer, when exactly it could happen. The main problem was unknown weapon, able to leave such a large destruction, even when considered next centuries. As we can find in annales that Poznan in A.D. 1253 had castle and fortifications so only iron meteorite impact in 1271, producing craters in the area of Morasko and Umultowo, can explain the scale of the devastation discovered by archeologists.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2017, 8; 123-148
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friedland 1304 – zajrzyjmy do źródeł
Friedland 1304 – let’s look to the sources
Autorzy:
Woźniak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1033015.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Freidland
Morasko meteorite
Vredeberch
comets
historic bolides
meteorites
meteoritica
wiki.meteoritica.pl
Opis:
I wonder if a description of Morasko meteorite “rainfall” could be found in any medieval chronicles? If Bartoshewitz’s and ‘bolid wielkopolski’ hypothesis’s are only the result of dishonesty of chroniclers and ancient meteorite researchers? A survey of old annals is closing us to the explanation of this catastrophic event from the turn of XIII and XIV century. However, new thesis requires further research.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2014, 5; 155-181
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New finds in the Morasko meteorite preserve, Poland
Autorzy:
Karwowski, Ł.
Pilski, A. S.
Muszyński, A.
Arnold, S.
Notkin, G.
Gurdziel, A.
Powiązania:
https://bibliotekanauki.pl/articles/411482.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
iron meteorite Morasko
new finds
strew nfield
Opis:
In result of searching in the Morasko preserve for the documentary series Meteorite Men two irons were found below ground. A 544-g shrapnel-like with weak shock deformations, mildly weathered, at low depth, and 34-kg individual, with its upper surface 156 cm deep, with a thick shell of clay and weathering minerals. Of particular interest is presence of chukanovite, a mineral discovered in the Dronino iron meteorite. Morasko is the second meteorite, where chukanovite could be found. The recovery of a new specimen so much deeper than the previous depth record, suggests that further, more detailed surveys should be conducted in the future with improved metal detecting equipment. Moreover, the larger specimen was found embedded in a Miocene clay, which demonstrates that it fell from the sky at that exact spot and was not deposited in glacial terminal moraine.
Źródło:
Meteorites; 2011, 1, 1; 21-28
2299-0313
2299-1220
Pojawia się w:
Meteorites
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:
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
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