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Suevit (impaktyt) w kolekcji meteorytów dr. Jacka Siemiątkowskiego

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Krzesińska A.
Acta Societatis Metheoriticae Polonorum
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2011
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vol. 2
85-91
EN
Petrographic and microtextural analyses were done on the thin section of an impactite from the Jacek Siemiątkowski Collection of Meteorites (ING PAN OB Wrocław). Two types of textures, crystalline and glassy are distinguishable. In each of them, mineral and rock fragments are deformed in different way and to various degree. One can distinguish: biotite kink bands, irregularly fractured quartz grains, twins of feldspar crystals. Moreover there are visible textures such as planar deformation features in quartz and feldspar grains, diaplectic and polymineral – lechatelierytic glasses. All the observed textures may testify the origin of the rock. The slightly deformed fragments and strongly deformed ones developed during the compression phase of the crater formation at different distance from a projectile and the crater centre. This event was followed by excavation of deformed material and its redeposition in the crater filling. The rock was recrystallised afterwards, which is inferred from the presence of the decorated PDFs and subgrains in some dynamically recrystallised quartz grains.
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Charakterystyka petrologiczna i chemiczna meteorytu Antonin – klasyfikacja oraz zarys historii termicznej i uderzeniowej

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Krzesińska A.
Acta Societatis Metheoriticae Polonorum
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2023
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vol. 14
114-133
EN
Meteorite Antonin fell on 15th July 2021 in Poland. The bolide was observed and recorded by cameras of European Bolide Network, Astronomical Institute of Czech Academy of Sciences. Soon after the fall, specimen of meteorite was recovered and delivered for classification. In this paper, analytical results collected in order to classify the Antonin meteorite are reported. Antonin is L5 ordinary chondrite with deformation degree S3 or S4. This paper includes reports of heterogeneous texture of chondrite and reports on chemical composition of minerals: olivine, low-Ca pyroxene, diopside and glasses, phosphates, chromite and ilmenite, as well as sulfides and native FeNi alloy. The minerals reveal different equilibration degree. Analysis of the texture and chemical composition of Antonin allows to put the meteorite in the framework of current classification of meteorites. It also facilitates making hypotheses on the thermal and collisional processes, that the meteorite experienced while on its parent body.
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