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Evolution of the Dislocation Structure of Iron Meteorite

Osuch W., Błoniarz R., Michta G., Suliga I.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 1

485--492

EN

The state of the dislocation substructure of meteorite in which the history of phenomena accompanying the meteorite during its passage through the Earth’s atmosphere is recorded remains unused. The main goal of the presented work is a comprehensive analysis of the dislocation structure of the iron meteorite from the Morasko reserve (Poland, Wielkopolska Voivodeship) by TEM methods to determine the conditions and mechanism of its formation. The work is cognitive in the field of phenomena related to the destruction and deformation of the material in extreme conditions: space and terrestrial space. It can also be useful in the research on the creation of the material with specific mechanical properties, as well as a unique reference material for earth experiments with low-temperature deformation, high-speed deformation, recrystallization processes with short thermal pulses and structure relaxation in conditions of very long time periods.

2

Optically stimulated luminescence techniques applied to the dating of the fall of meteorites in Morasko

Moska P., Stankowski W., Poręba G.

Geochronometria

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2018

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Vol. 45, no. 1

74--81

EN

Geological materials used for luminescence dating and associated with the fall of meteorites on the Earth’s surface are extremely rare. The Morasko region has gained fame over the past 100 years because of a cosmic catastrophe which took place there. After thousands of years, the remains of a large metal meteorite which fell in this area have been found. In this article, we would like to state whether it is possible, using luminescence methods, to determine the moment when the iron meteorite fell on the surface of the Earth. The material which was analysed consisted of meteorite crust layers – melt/fusion and “semi melt/fusion”, including sintered ones, along with the sediments surrounding the meteorite. The final results are connected with four objects of different sizes (large ones and small shrapnel – 261 kg, 34 kg, 970 g and 690 g). The obtained results show a large discrepancy, which is most likely associated with the problem of resetting the luminescence signal of the tested materials.

3

Mineralogia drobnoziarnistych utworów z krateru meteorytu Morasko

Duczmal-Czernikiewicz A., Muszyński A

Biuletyn Państwowego Instytutu Geologicznego

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2015

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nr 464

17--23

PL

Przedstawiono wstępne wyniki badań mineralogicznych utworów w rejonie rezerwatu przyrody Meteoryt Morasko znajdującego się w północnej części Poznania. Ponad 5000 lat temu spadł tu meteoryt, a ślad tego zdarzenia zaznacza się w morfologii w postaci kilku zagłębień oraz otaczających je wałów. Rejon rezerwatu jest zbudowany z glin polodowcowych i podścielających je iłów formacji poznańskiej. Prace wykonano w celu rozpoznania składu mineralnego utworów, ustalenia potencjalnych mineralogicznych skutków uderzenia meteorytu oraz określenia, jak wpłynęło ono na miękkie, młode osady. Metodami mikroskopowymi i rentgenowskimi oznaczono podstawowe składniki glin i iłów, zbadano frakcje ziarnowe glin oraz wyróżniono ich składniki pierwotne i wtórne. Do składników pierwotnych należą: kwarc, skalenie, pirokseny, minerały ilaste (illit, kaolinit), a także otoczaki skał magmowych. Procesy wietrzenia doprowadziły do powstania składników wtórnych: współczesnych gleb (humus, fragmenty korzeni) oraz glinokrzemianów z grupy wermikulitu. Materiał wtórny stanowią także klasty ilastych skał starszego podłoża, zawierających składniki typowe dla formacji poznańskiej (illit, kaolinit, smektyt i minerał mieszanopakietowy smektyt/ illit, bardzo drobnoziarnisty kwarc oraz prawdopodobnie skalenie). Na podstawie wyników dotychczasowych obserwacji i badań stwierdzono, że obecność klastów ilastych w glinach może być związana z upadkiem meteorytu.

EN

The present paper shows preliminary results of mineralogical studies of sediments in the Morasko Meteorite Nature Reserve located in the northern part of Poznań. The meteorite fell there over 5000 years ago, that left signs in the present morphology of the region in form of several craters and elevations that surround them. These forms are underlain by glacial tills and clay – silt sediments, known as the Poznań Formation. The aim of the research was to identify of the mineralogical composition of sediments, determine potential mineralogical effects of the meteorite fall, verify the impact of the meteorite fall on soft young sediments. The studies were conducted with the use of microscopic and X-ray diffraction equipment. Primary and secondary components were identified in grain fractions. Quartz, feldspar, pyroxene, clay minerals (illite, kaolinite), and pebbles of igneous rocks are the primary components of the sediment. Weathering processes resulted in the development of modern soil profiles (humus, root fragments) and aluminum silicates of vermiculite-type minerals. The secondary components are clay clasts of older rocks in younger ones, which contain components typical of the Poznań Formation (illite, kaolinite, smectite or mixed-layered smectite/ illite, very fine-grained quartz and likely feldspars). The presence of clay intercalations in tills can be associated with the meteorite fall.