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Chromian spinels from the Magura Unit (Western Carpathians, Eastern Slovakia) - their petrogenetic and palaeogeographic implications
Názov Chromian spinels from the Magura Unit (Western Carpathians, Eastern Slovakia) - their petrogenetic and palaeogeographic implications Aut.údaje Katarína Bónová ... [et al.] Autor Bónová Katarína (60%)
Spoluautori Spišiak Ján 1953- (16%) UMBFP01 - Katedra geografie a geológie
Bóna Ján (12%)
Kováčik Martin (12%)
Zdroj.dok. Geological Quarterly. Vol. 61, no. 1 (2017), pp. 3-17. - Warszaw : Polish Geological Institute - National Research Institute, 2017 Kľúč.slová provenance detrital chromian spinel geochémia - geochemistry Heslá geogr. Západné Karpaty (pohorie) Magura Basin Jazyk dok. angličtina Krajina Poľsko Systematika 550.4 Anotácia Detrital chromian spinels in sedimentary rocks provide much information concerning the tectonics of their parental ultrabasic rocks. Chromian spinels occurring in the Eocene to Oligocene deposits from the Magura Nappe were examined to provide some constraints on the history of the Magura Basin. The Magura Nappe is a part of the Flysch Belt belonging to the External Western Carpathians. The Magura Nappe is separated by a narrow zone associated with the Pieniny Klippen Belt and is divided into three principal tectono-lithofacies units (from the S to N): the Krynica, Bystrica and Rata units. Cr-spinel is a common accessory mineral (2.3-5.9 vol% of heavy mineral spectra) in the siliciclastic rocks of the Raca and Krynica units. In terms of texture and chemical composition, two types of Cr-spinels were recognized: unaltered and altered. Unaltered spinels were found to contain silicate inclusions such as chromio-pargasite, enstatite, diopside, pargasite, plagioclase and olivine (forsterite). The chromian spinels show wide variations in compositional parameters such as Cr# (0.3-0.7), Mg# (0.3-0.7), TiO2 (<0.03-1.9 wt.%) and Fe2+/Fe3+ (2.5-13) whereas the differences between the Raca and Krynica units are insignificant. These parameters suggest a peridotitic and volcanic origin of the spinels, respectively. The ophiolite source consisting of harzburgitic mantle peridotites was developed mainly in a supra-subduction zone setting; volcanic spinels indicate an origin in mid-ocean ridge basalts, back-arc basin basalts and sporadically in ocean-island basalts. Concerning their geo-chemical features, we propose that during the Eocene to Early Oligocene, the ophiolitic detritus in the eastern part of the Magura Basin deposits may have been derived from a source area located in the Fore-Marmarosh Suture Zone (Eastern Carpathians) that is considered an equivalent of the Black Flysch and Ceahlau units. Some Cr-spinels found in the Eocene sedimentary successions may have resedimented from older Late Cretaceous-Paleocene formations of the Magura Unit, which are considered as reworked sedimentary material from the Pieniny Klippen Belt. URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 41743 Kategória ohlasu MADZIN, Jozef - PLAŠIENKA, Dušan - MÉRES, Štefan. Provenance of synorogenic deposits of the Upper Cretaceous-Lower Palaeogene Jarmuta-Proc Formation (Pieniny Klippen Belt, Western Carpathians). In Geologica Carpathica. ISSN 1335-0552, 2019, vol. 70, no. 1, pp. 15-34.
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