Bąk, Marta
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nauki o Ziemi i środowisku
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Item type:Article, Access status: Open Access , Stromboli - the best place to actively learn and understand the behavior of an active volcano and its processes(Wydawnictwa AGH, 2016) Bąk, Krzysztof; Bąk, Marta; Szubert, MariuszBasaltic volcanism, a dominant mode of volcanic activity on Earth, occurs as explosive eruptions, resulting from the exsolution of magmatic gases and is exhibited by Strombolian and Hawaiian types. Strombolian activity takes its name from frequent, small-scale explosions of the Stromboli Volcano, which was formed within the Aeolian Islands, north of Sicily. This paper presents the volcanic structure and features of its activity, based on the results of numerous studies carried out during the last 15 years. In the intention of the authors, this educational presentation would be an incentive to make a decision to travel to Stromboli and see its present-day activity and its effects from just a few hundred meters. To have a safe experience and to avoid accidents and injuries, the tourists need to have sufficient up-to-date information, before they embark on their adventure.Item type:Article, Access status: Open Access , Lithistid spicules in the sediments of the Turonian Variegated Shale in the Silesian Nappe, Polish Outer Carpathians(Wydawnictwa AGH, 2014) Okoński, Szymon; Górny, Zbigniew; Bąk, Marta; Bąk, KrzysztofTurbiditic silty and sandy intercalations in the Turonian Variegated Shale from the Silesian Nappe (Polish Outer Carpathians) contain numerous sponge spicules among siliciclastic fine-grained particles. The highest amount of spicule admixture is nearly 50%. In such layers, they create spiculitic sublitharenite microfacies. These sponge spicules contain forms belonging mostly to the Lithistida group (97% of morphotypes), with a small admixture of spicules from the Hexactinellidae group. Tetraclones with a high content of different types of triaenes dominate among desmas, what indicates the dominance of sponges from subfamily Tetracladina. The preservation state of spicules is generally poor. The Variegated Shale deposits that contain the sponge spicules were accumulated in a deep sea basin, below the calcium compensation depth. Most probably, the spicules were derived from loose material accumulated earlier in various parts of the basin slopes, from which they were exhumed and again redeposited by turbidity currents during the Turonian times.Item type:Article, Access status: Open Access , The Racławka Valley - an example of an educational geosite related to the development of a Paleozoic carbonate platform(Wydawnictwa AGH, 2016) Szczurek, Stanisław; Bąk, Marta; Dulemba, PawełThe location and most interesting geological features of the Upper Devonian through Lower Carboniferous limestones in the Racławka Valley were presented. The limestones outcropped almost continuously along the natural valley cutting. They comprise over 60 million years of continuous growth of the carbonate platform, which developed on the ancient terrane – the Upper Silesian Block. Geosites described herein may constitute a destination for geological trips for undergraduate students of Environmental Sciences, where they can actively discover the development of an ancient carbonate platform and accompanied post depositional structures.Item type:Article, Access status: Open Access , Early Carboniferous trilobite remains from limestones of the Dębnik Anticline, southern Poland(Wydawnictwa AGH, 2014) Bąk, Marta; Dulemba, Paweł; Bąk, KrzysztofThe presence of proetid trilobites' remnants is reported for the first time from the Lower Carboniferous limestones of the Dębnik Anticline outcropping in the Raclawka Valley, situated in the eastern part of the Upper Silesian Block (southern part of the Cracow Upland). Disintegrated exoskeletons of trilobites are observed in thin sections of fine-grained, peloidal wackstones and packstones. These rocks contain also foraminifers which indicate an early Tournaisian age for this locality.