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Dokumentacja znalezisk meteorytu Morasko w latach 2011–2014 : problemy metodyczne i uzyskane efekty

Nowak Monika, Muszyński Andrzej

Przegląd Geologiczny

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2020

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Vol. 68, nr 12

879--885

EN

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.

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Zastosowanie metod instrumentalnych w badaniach meteorytu Morasko

Muszyński Andrzej, Runka Tomasz, Gołębiewska Bożena, Michalska Danuta, Karwowski Łukasz

Przegląd Geologiczny

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2019

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Vol. 67, nr 3

156--158

EN

Since its discovery, the Morasko meteorite has been the subject of many studies. Among the publications summarising the mineralogical and geochemical characteristics of the Morasko meteorite, two monographs are worth mentioning by: Dominik (1976) and Muszyński et al. (2012), in which the essentialfeatures of the Morasko meteorite were presented. Since the first piece of the Morasko meteorite was to be explored, the analysis of mineral composition has been conducted with more and more specialised and sophisticated instrumental methods. As it is well known, the Morasko meteorite is classified into the group of iron meteorites IAB MG, and consists mainly of the crystalline Fe-Ni alloy in the form of two minerals: kamacite and taenite, accompanied by tetrataenite. A commonly found structure of the mineral composition of the Morasko meteorite, as regards other iron meteorites, are graphite-troilite nodules, which contain silicate and phosphate minerals. This paper presents a review ofresearch on the mineralogy and geochemistry of the Morasko meteorite, where a number of instrumental tests have been used, from microscopic observations to microchemical semiquantitative analyses using scanning electron microscopy (SEM-EDS), microchemical quantitative analyses using an electron microprobe (WDS), to the structural methods applying Raman spectroscopy. The results of microscopic, microchemical and microstructural investigations, which have included the outer layer of the meteorite known as a fusion crust, have been presented against the petrographic composition of the meteorite. Besides, the type of sediment attached to the outer meteorite layer was examined. The research, conducted on two dozen meteorite fragments, allowed distinguishing two different zones concerning mineralogy and geochemistry, and to determine microstructural changes within them, most probably created in the processes related to the moment of the meteorite impact.

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Shock structures in the Morasko meteorite - preliminary SEM data

Brachaniec T.

Contemporary Trends in Geoscience

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2014

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Vol. 3, iss. 1

1--4

EN

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.