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001-es BibID:	BIBFORM119969
Első szerző:	Oravecz Éva
Cím:	Age, Kinematic and Thermal Constraints of Syn-Orogenic Low-Temperature Deformation Events: Insights From Thermochronology and Structural Data of the Nekézseny Thrust (Alpine-Carpathian-Dinaric Area) / Éva Oravecz, Zsolt Benkó, Róbert Arató, István Dunkl, Gábor Héja, Szilvia Kövér, Tibor Németh, László Fodor
Dátum:	2024
ISSN:	0278-7407
Megjegyzések:	Unraveling the age and kinematics of low temperature deformation events is crucial in understanding the late?stage evolution of orogens. However, accurate age constraints can often be challenging to obtain due to unideal outcrop conditions, large sedimentary hiatuses or the lack of well?defined thermal events. In this study, we show on the example of the Nekézseny Thrust, a poorly exposed late orogenic thrust in the southern Western Carpathians, that a combined approach of structural analysis and multi?method thermochronology can provide the necessary temporal, kinematic and thermal constraints for a detailed reconstruction of the deformation history. While structural mapping revealed that the Late Cretaceous Uppony Gosau Basin in the footwall of the Nekézseny Thrust underwent a significant post?Campanian and pre?Miocene shortening, K/Ar dating of fault gouge samples from the main fault zone constrained the primary thrusting event to the Maastrichtian. Based on the acquired apatite fission?track and (U?Th)/He ages, subsequent heating of the Upper Cretaceous sediments due to tectonic burial was limited to 75-100°C, followed by deformation?related and gradual cooling between the Eocene and Early Miocene. Considering the reconstructed deformation history, as well as the large?scale tectonic affinity of the displaced units in its footwall and hanging wall, the Nekézseny Thrust is a far?traveled (ca. 600 km) segment of the Late Cretaceous Alps?Dinarides contact zone, whose development was linked to the switch from lower plate to upper plate position with respect to the Sava Zone and Alpine Tethys sutures, respectively.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Tectonics. - 43 : 4 (2024), p. 1-28. -
További szerzők:	Benkó Zsolt (1980-) (geológus) Arató Róbert Dunkl István Héja Gábor Kövér Szilvia Németh Tibor Fodor László (geológus)
Pályázati támogatás:	113013 Egyéb 134873 Egyéb ÚNKP-17-2 Egyéb ÚNKP-20-3 Egyéb
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001-es BibID:	BIBFORM116333
035-os BibID:	(cikkazonosító)107330 (Scopus)85168331822
Első szerző:	Szemerédi Máté
Cím:	Large-volume Permian felsic volcanism in the Tisza Mega-unit (East-Central Europe): Evidence from mineralogy, petrology, geochemistry, and geochronology / Máté Szemerédi, Andrea Varga, Réka Lukács, István Dunkl, Ioan Seghedi,Mihai Tatu, Zoltán Kovács, Béla Raucsik, Zsolt Benkó, Szabolcs Harangi, Elemér Pál-Molnár
Dátum:	2023
ISSN:	0024-4937
Megjegyzések:	Permian felsic volcanic rocks are widespread in the Tisza Mega-unit (Carpathian-Pannonian region), covering a relatively large area from southern Transdanubia (Hungary) to the Apuseni Mountains (Romania). The present occurrence and structural position of these Permian volcanic rocks are the result of a complex tectonic evolution (including Alpine nappe stacking and Neogene extension); meanwhile, multiple hydrothermal effects and deformation modified their microtexture and chemical composition. In this study, the same emphasis was given to Permian felsic volcanism as well as the subsequent fluid- and/or deformation-related processes in the Tisza Mega-unit to extend our knowledge in regional issues (e.g., geochronology, stratigraphy, and lithologic correlations) and to investigate if the variably altered volcanic rocks can be used in petrogenetic studies. The zircon U-Pb dating yields ages of ~270.4-262.9 Ma for the Apuseni samples and ~268.4-260.2 Ma for those of the Pannonian Basin. Whole-rock geochemistry, considering immobile trace elements, since most of the major element compositions were severely modified by alteration processes, indicates that the studied rocks are dacite to rhyolite. They belong to a voluminous silicic volcanism during the Middle Permian, most probably related to rifts. Petrography, whole-rock geochemistry, and X-ray powder diffraction mineralogy revealed that the predominant alteration of the studied rocks is hydrothermal sericitization, locally superimposed by mylonitization in greenschist to subgreenschist conditions during Alpine orogeny. The K-Ar dating of the separated illite fractions confirms that the ductile deformation acted during the Turonian nappe stacking, as the main Alpine deformation phase in the study area.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Permian Carpathian-Pannonian region Felsic volcanism Petrology Geochronology Postmagmatic alterations
Megjelenés:	Lithos. - 456-457 (2023), p. 1-21. -
További szerzők:	Varga Andrea (geológus) Lukács Réka Dunkl István Seghedi, Ioan Tatu, Mihai Kovács Zoltán (1988-) (geográfus) Raucsik Béla Benkó Zsolt (1980-) (geológus) Harangi Szabolcs (1962-) (geokémikus, vulkanológus) Pál-Molnár Elemér
Pályázati támogatás:	K 131690 Egyéb K 108375 Egyéb
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