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Chondryt Antonin – pierwszy polski meteoryt ze zrekonstruowaną orbitą wokółsłoneczną. Raport z klasyfikacji i rejestracji oraz propozycje działań mogących wzbogacić kolekcję polskich meteorytów

Krzesińska Agata, Tymiński Zbnigniew, Maćkowska Roksana

Przegląd Geologiczny

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2023

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Vol. 71, nr 7

372--385

EN

On July 15, 2021, a bright fireball was registered over Poland and it led to a meteorite fall near the towns of Antonin and Mikstat, on the border of the Greater Poland and Lower Silesia voivodeships. Soon after registration of the bolide, a meteorite fragment was found. Observation of the fireball's trajectory helped to reconstruct the pre-atmospheric parameters of the meteoroid, such as the orbit inclination or eccentricity (Shrbený et al., 2022). Additionally, finding of the meteorite fragment enabled petrographic research and reconstruction of the thermal and collisional history of meteorite'sparent body. The Antonin meteorite is the first Polish meteorite with the reconstructed pre-atmospheric orbit and, atthe moment, one of only fifty in theworld. It is an L5 ordinary chondrite (Shrbený et al., 2022; Krzesińska, 2023). Here we present a report on the classification and registration process of the Antonin meteorite. Registration included measurements of cosmogenic isotope, necessary to prove the connection of the meteorite with the observed bolide. The specimen was found during the private expedition, so no direct proof existed for find in the predicted fall area. Cosmogenic isotope study allowed to assessing the time of meteorite fall, which matched the fireball event. Classification included petrographic and mineralogical analysis of the rock. The fall and find circumstances of Antonin allowed us to reflect on the lack of awareness of the Polish society regarding meteorites. Such unawareness is also seen when the whole collection of Polish meteorites is statistically analysed. We present such analysis at the end of the paper, and conclude that many meteorite falls in Poland must be unnoticed. Additionally, inability of citizens to recognize a meteorite, especially a chondrite, causes that many of these rocks remain unrecovered. The aim of this paper is to inspire the reader to pay attention to falls of meteorites, and to look for potential meteorite rocks. In final, we encourage the readers to get involved in activities of fireball networks and to take part in meteorite recovery trips.

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Mineralogy and geochemistry of rare earth elements in the Moyil Valley alteration zones, Meshkinshahr (northwest Iran)

Naseri Hossain, Jamadi Mahnaz, Radmard Kaikhosrov, Alavi Ghafour

Geologos

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2020

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Vol. 26, No. 3

219--231

EN

Sabalan Mountain (northwest Iran) witnessed intense volcanic activity during the Cenozoic (Plio-Pleistocene). The result of this manifests itself in the conical geometry of the Sabalan stratovolcano and ahigh hydrothermal gradient around it, which can be detected by geological phenomena such as hot springs, smoke gases and steam outlet pores. The high hydrothermal slope and upward migration of hot water in this area have caused extensive alteration zones in the host rocks. A mineralogical study of alteration zones in thewells drilled in the Moyil Valley to the northwest of Sabalan Mountain has revealed the presence of phyllic, argillic, calcitic and propylitic alterations in volcanic rocks (trachyandesite) and alteration phyllic and propylitic ones in monzonite rocks. In chondrite-normalised rare-earth-element diagrams, trachyandesite rocks exhibit an HREEs enrichment when compared to MREEs and LREEs in propylitic and calcitic alteration zones. This result can be explained by the acidic nature of hydrothermal fluids containing complex ions such as (SO-2, Cl-). The (La/Yb)cn, (La/Sm)cn and (Tb/Yb)cn ratios for argillic, phyllic, propylitic and calcitic alteration zones have revealed that they are higher in fresh rocks compared to altered rocks, suggesting the enrichment of HREEs in comparison to LREEs and MREEs. The anomalies of Eu do not change remarkably in the argillic and propylitic alteration zones of trachyandesite rocks; apparently, alteration hadno effect on them. Such behaviour reflects the presence of gold cations in Eu+3 formed at temperatures below 250°C. Eu anomalies increased in propylitic alteration zones in monzonite rocks and calciticand phyllic alteration zones in trachyandesiterocks.

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Wyniki badań mineralogicznych i petrologicznych nowych okazów meteorytu Pułtusk w 150 rocznicę spadku

Przylibski T. A., Łuszczek K.

Przegląd Geologiczny

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2018

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Vol. 66, nr 6

368--378

EN

One of the largest observed stone meteorite shower in the history of mankind on Earth took place on Thursday evening on January 30, 1868, about seven o’clock near Pułtusk in Poland. Despite the 150th anniversary of the fall of chondrite officially classified as Pułtusk H5 with a shock stage S3 there is still little published data on the chemical composition of minerals of this chondrite as well as its petrological characteristics in the literature. The authors carried out mineralogical and petrological research that will help a little to fill this gap in knowledge about the Pułtusk chondrite. Meteorite specimens found by Piotr Kuś in 2015 and investigated by the authors are undoubtedly part of the Pułtusk fall of January 30, 1868. They can be classified as ordinary chondrite H5, S2,W2. The authors stated that the studied rock is characterized by a varied shock level -from S1 to S2/3, as well as it contains chondrules of the chromite-plagioclase unequilibrated rock. In the composition of the examined fragment of Pułtusk chondrite, the authors identified silicates: olivine, diopside, bronzite and clinohyperstene, and oligoclase, oxides: chromite (and spinel), sulfides: troilite, FeNi alloy mineral phases: kamacite and taenite, as well as phosphates: merrilite and apatite. The chemical composition of olivine crystals as well as low- and high-Ca pyroxenes crystals and plagioclase crystals (about the composition of oligoclase) confirms that the examined specimen comes from the Pułtusk fall and it is a rock that should be classified as a petrographic type H5.

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Microscopic investigations of Gold Basin and El Hammami chondrites

Szurgot M., Polański K.

Scientific Bulletin. Physics / Lodz University of Technology

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2007

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Vol. 28

79-94

EN

Elemental and mineral composition of Gold Basin and El Hammami meteorites discovered in 1995 and 1997 have been studied by analytical electron microscopy and optical microscopy. It was established that the main meteorite minerals: olivines, pyroxenes, kamacite and taenite as well as troilite identified in the samples represent extraterrestrial minerals typical of the ordinary chondrites. Feldspars represented by plagioclase, orthoclase, magnetite, calcite, chromite and silica have been also present in the studied samples. Chemical and mineral composition, iron content, petrologic types of chondrules, their abundance and sizes, the presence of troilite veins and abundance of nonoxidised iron phases confirm H class of El Hammami chondrite, i.e.. olvine-bronzite class, and L class of Gold Basin, i.e. olivine-hyperstene class.

PL

Badano skład chemiczny i mineralny meteorytów Gold Basin i El Hammami. Zanalizowano chondry i ciasto skalne. Obecność chondr oliwinowych, chondr piroksenowych, żył troilitowych oraz faz żelazo-niklowych: kamacytu i troilitu świadczą o pozaziemskim pochodzeniu badanych skał. Oprócz minerałów najbardziej rozpowszechnionych w meteorytach takich jak: oliwin, piroksen, kamacyt, taenit i troilit wykryto także plagiklazy, magnetyt, kalcyt, chromit, ortoklaz i krzemionkę. Zgodnie z uprzednią klasyfikacją Gold Basin jest chondrytem klasy L o niskiej zawartości żelaza, a El Hammami chondrytem typu H zawierającym dużo żelaza.

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Microscopic studies of NWA4047 meteorite

Szurgot M., Polański K., Krystek M.

Scientific Bulletin. Physics / Lodz University of Technology

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2006

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Vol. 27

61-76

EN

Elemental and mineral composition of NWA4047 meteorite found in 2005 has been studied by analitical electron microscopy and optical microscopy. It was established that the main meteorite minerals: olivines, pyroxenes, kamacite and taenite as well as troilite identified in the sample represent extraterrestrial minerals typical of the ordinary chondrite of high iron content. Chemical and mineral composition, petrologic types of chondrules, their abundance and sizes, the presence of troilite veins and abundance of nonoxidised iron phases confirm H class of this chondrite, i.e. olvine-bronzite class.

PL

Badano skład chemiczny i mineralny meteorytu NWA 4047. Zanalizowano chondry i ciasto skalne tego meteorytu. Obecność chondr, żył troilitowych oraz faz żelazo-niklowych: kamacytu i troilitu świadczą o pozaziemskim pochodzeniu badanej skały i przynależności tego meteorytu do chondrytów żelaznych o dużej zawartości żelaza, tj. do klasy chondrytów oliwinowo-bronzytowych.

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The investigation of genetic relationship between the Baszkówka and Mt. Tazerzait chondrites by NAA and other methods

Dybczyński R., Borucki J., Danko B., Kulisa K., Polkowska-Motrenko H., Samczyński Z., Stępniewski M., Szopa Z., Tanida K.

Chemia Analityczna

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2001

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Vol. 46, No. 4

477-488

EN

The similarity of two meteorites, Baszkowka (Poland, 1994) and Mt. Tazerzait (Niger, 1991), was studied by instrumental and radiochemical neutron activation analysis supplemented by mercury determination with the aid of an automatic mercury analyzer yielding data for 23 elements. The bulk composition of both meteorites is nearly identical within the experimental error. Their composition is also similar to the mean composition of L chondrites but there are marked deviations in the cases of Pd, Os, Pt, Cu and Hg. It seems also that both meteorities are slightly enriched in light rare earth elements (REE) and slightly depleted in heavy REE in comparison with L chondrites. This study supports earlier suggestions based on petrological properties, abundance of noble gases and their isotopic composition, gas retention ages and cosmic ray exposure ages, that these two chondrites have the same origin and the common parent body. It cannot be excluded that this parent body is different from that typical for all other known L chondrites.

PL

Stosując instrumentalną i radiochemiczną neutronową analizę aktywacyjną oraz automatyczny analizator rtęci badano podobieństwo dwóch meteorytów o nazwach: Basz-kówka (Polska, 1994) oraz Mt. Tazerzait (Niger, 1991). Na podstawie oznaczenia 23 pierwiastków stwierdzono, że całościowy skład obu meteorytów jest niemal identyczny w granicach błędu doświadczalnego. Ich skład jest też podobny do średniego składu chondrytów typu L, jednakże z istotnymi odchyleniami w przypadku Pd, Os, Pt, Cu i Hg. Wydaje się także, że oba meteoryty są nieznacznie wzbogacone w lekkie i nieznacznie zubożone w ciężkie ziemie rzadkie w stosunku do chondrytów L. Badania te potwier-dzająwcześniejsze sugestie, oparte na własnościach petrologicznych, obecności gazów szlachetnych i ich składu izotopowego, wieku zatrzymania gazu oraz wieku kosmicznego napromieniowania że oba chondryty mają takie samo pochodzenie i wspólne ciało macierzyste. Nie jest wykluczone, że to ciało macierzyste różni się od ciała macierzystego wszystkich innych chondrytów typu L.