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001-es BibID:BIBFORM116329
035-os BibID:(Scopus)85175031969 (WoS)001092105000001
Első szerző:Molnár Kata
Cím:Unravelling the pre-eruptive conditions of the rhyolitic Šumovit Greben lava dome from clinopyroxene-dominant glomeroporphyritic clots / Kata Molnár, Pierre Lahitte, Boglárka Döncző, Róbert Arató, János Szepesi, Zsolt Benkó, Sebastien Nomade, Jochen Gätjen, Stéphane Dibacto, Marjan Temovski
Dátum:2023
ISSN:0010-7999
Megjegyzések:Detailed analyses of mineral composition and whole-rock geochemical data helped to unravel the volcanic plumbing system beneath the rhyolitic Sumovit Greben lava dome, the westernmost member of the Kozuf-Voras volcanic system (N. Macedonia). It is characterized by high SiO2 content (> 70 wt%) coupled with low MgO (< 1 wt%) and Sr (< 500 ppm) suggesting fractionation of clinopyroxene and plagioclase at depth forming a crystal mush and a crystal-poor rhyolitic lens by fractional crystallization and melt extraction on top of it. The crystal mush is composed of mainly clinopyroxene, biotite and plagioclase, whereas sanidine and plagioclase are the most abundant phenocrysts of the rhyolitic lens. The main dome forming event occurred at ca. 2.9 Ma, which sampled the crystal-poor rhyolitic lens. After a short quiescence time, an explosive eruption occurred depositing a massive lapilli tuff layer northwest of the lava dome, and an extrusion of a small-volume lava flow on the northern side of the lava dome at ca. 2.8 Ma. This latter sampled also the crystal mush, as it contains abundant glomeroporphyritic clots of clinopyroxene +/- plagioclase +/- biotite. The clinopyroxene phenocrysts are chemically homogeneous, their crystallization temperature is ca. 900(degrees)C representing the crystal mush, whereas the plagioclase and the sanidine crystallized at a lower temperature (ca. 790(degrees)C) representing the rhyolitic lens. Noble gas isotopic composition of the clinopyroxene indicate no mantle-derived fluids (< 0.5%) having an R/R-a of ca. 0.04 R-a. The rejuvenation of the system probably occurred due to implementation of mafic magma at depth leading to a heat transfer and partial melting of the cumulate. This led to crystallization of Ba-rich rims of the sanidine and An- and Sr-rich rims of the plagioclase. The crystal mush zone beneath Sumovit Greben might be connected to the nearby, more mafic volcanic centers, and the eruption of Sumovit Greben could have been the start of the last cycle in the lifetime of the Kozuf-Voras volcanic system.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Rhyolite
Clinopyroxene
Noble gases
Volcanic plumbing system
Sanidine Ar/Ar dating
Megjelenés:Contributions To Mineralogy And Petrology. - 178 : 11 (2023), p. 1-17. -
További szerzők:Lahitte, Pierre Döncző Boglárka (1987-) (biológiatanár-földrajztanár) Arató Róbert Szepesi János Benkó Zsolt (1980-) (geológus) Nomade, Sebastien Gätjen, Jochen Dibacto, Stéphane Temovski, Marjan
Pályázati támogatás:GINOP-2.3.2-15-2016-00009
GINOP
GINOP-2.3.3-15-2016-00029
GINOP
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2.

001-es BibID:BIBFORM106604
035-os BibID:(WoS)000734011500001 (Scopus)85121652725
Első szerző:Molnár Kata
Cím:The westernmost Late Miocene-Pliocene volcanic activity in the Vardar zone (North Macedonia) / Kata Molnár, Pierre Lahitte, Stéphane Dibacto, Zsolt Benkó, Samuele Agostini, Boglárka Döncző, Artur Ionescu, Ivica Milevski, Zita Szikszai, Zsófa Kertész, Marjan Temovski
Dátum:2021
ISSN:1437-3254
Megjegyzések:Late Miocene to Pleistocene volcanism within the Vardar zone (North Macedonia) covers a large area, has a wide range in composition, and is largely connected to the tectonic evolution of the South Balkan extensional system, the northern part of the Aegean extensional regime. The onset of the scattered potassic to ultrapotassic volcanism south from the ScutariPeć transverse zone occurred at ca. 8.0 Ma based on this study. Here, we focused on three volcanic centers located on deep structures or thrust faults along the western part of the Vardar zone, for which there is none to very little geochronological and geochemical data available. Pakoševo and Debrište localities are represented as small remnants of lava fows cropping out at the southern edge of Skopje basin and at the western edge of Tikveš basin, respectively. Šumovit Greben center is considered as part of the Kožuf-Voras volcanic system, and it is located on its westernmost side, at the southern edge of Mariovo basin, which is largely composed of volcaniclastic sediments. We present new eruption ages applying the unspiked Cassignol-Gillot K-Ar technique on groundmass, as well as petrological and geochemical data, supplemented with Sr and Nd isotopes to complement and better understand the Neogene-Pleistocene volcanism in the region. Eruption ages on these rocks interlayered between sedimentary formations allow to better constrain the evolution of those sedimentary basins. Rocks from the three volcanic centers belong to the high-K calc-alkaline-shoshonitic series based on their elevated K content. The oldest center amongst these three localities, as well as other Late Miocene centers within the region, is the trachyandesitic Debrište, which formed at ca. 8.0 Ma, and exhibits the highest Nd and lowest Sr isotopic ratios (0.512441-0.512535 and 0.706759-0.706753, respectively). The basaltic trachyandesite Pakoševo center formed at ca. 3.8 Ma and its Nd and Sr isotopic ratios (0.512260 and 0.709593, respectively) bear the strongest signature of crustal contamination. The rhyolitic Šumovit Greben center is a composite volcanic structure formed at ca. 3.0-2.7 Ma. Its youngest eruption unit has a slightly higher Nd and lower Sr isotopic ratios (0.512382 and 0.709208, respectively) representing a magma with a lesser extent of crustal assimilation than the other samples from this center. The overall trend through time in the Sr and Nd isotopic ratios of the Late Miocene to Pleistocene mafc volcanic centers in the region implies an increasing rate of metasomatism of the lithospheric mantle.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Unspiked Cassignol-Gillot K-Ar dating
Late Miocene-Pleistocene
Volcanism
Vardar zone
Sr and Nd isotopes
Megjelenés:International Journal Of Earth Sciences. - 111 : 3 (2021), p. 749-766. -
További szerzők:Lahitte, Pierre Dibacto, Stéphane Benkó Zsolt (1980-) (geológus) Agostini, Samuele Döncző Boglárka (1987-) (biológiatanár-földrajztanár) Ionescu, Artur Milevski, Ivica Szikszai Zita (1969-) (fizikus) Kertész Zsófia (1971-) (fizikus) Temovski, Marjan
Pályázati támogatás:GINOP-2.3.2-15-2016-00009
GINOP
TÉT-FR-2018-00018
Egyéb
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3.

001-es BibID:BIBFORM125719
035-os BibID:(Scopus)85202158044 (WOS)001308049700007
Első szerző:Temovski, Marjan
Cím:Constraining the evolutionary stages of a hypogene karst system by combining morphological, geochemical and geochronological data - the example of carbonate breccia-hosted Melnička Peštera / Temovski, Marjan; Ruszkiczay-Rüdiger, Zsófia; Molnár, Kata; Rinyu, László; Wieser, Alexander; Marchhart, Oscar; Palcsu, László
Dátum:2024
ISSN:0392-6672 1827-806X
Megjegyzések:A combination of morphological observations, geochemical data from calcite minerals and geochronology by burial age dating and U-series is used to constrain the geological and geomorphological setting and the evolutionary stages of a hypogene karst system. This methodological suit is applied to Melni?cka Pe?stera, a horizontal cave developed in carbonate breccia overlying dolomite marble in Melnica locality (N. Macedonia), where hydrothermal karst development occurred in both dolomite and calcite marble. The passage morphology of the cave, having a reverse triangle, Laughöhle cross-sections, suggests development near the water table by slowly moving waters. Calcite crusts are found throughout the cave, and based on their relationship to passage morphology, appear to pre-date main horizontal passage formation. Their carbonate stable and clumped isotope and fluid inclusion noble gas compositions indicate cooling of the hydrothermal system with an increased contribution of shallower groundwater. U-series data suggests Early Pleistocene deposition of the calcite crusts. Water table notches and convectional features carved into breccia bedrock and calcite crusts point to subsequent development at and above the water table by condensation corrosion. The solutional aggressiveness near the water table was likely related to CO2, that previously degassed from the deeper parts of the system where calcite was depositing, and redissolved in the cooler, shallower waters. Due to poor connection with the surface, the cave air above the water table likely had high pCO2, that further helped to maintain aggressiveness of the groundwater at the water-air contact, and boosted condensation corrosion above it, preventing deposition of related secondary calcite minerals. The cave-hosting carbonate breccia deposited as an alluvial fan filling up a paleovalley cut into Upper Miocene sediments. Cosmogenic nuclide burial age dating of quartz fragments confirms Early Pliocene age for the breccia, and constrains the paleovalley incision to Late Miocene, likely related to base level lowering caused by the Messinian Salinity Crisis. - 2024, Societa Speleologica Italiana. All rights reserved.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
burial age dating
hydrothermal speleogenesis
Mariovo
noble gases
stable isotopes
Megjelenés:International Journal of Speleology. - 53 : 2 (2024), p. 169-190. -
További szerzők:Ruszkiczay-Rüdiger Zsófia Molnár Kata Rinyu László (fizikus) Wieser, Alexander Marchhart, Oscar Palcsu László (1975-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00009
GINOP
FK 124807
OTKA
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4.

001-es BibID:BIBFORM109502
Első szerző:Temovski, Marjan
Cím:Petrographic and geochemical properties of a subaqueous speleothem from a Macedonian cave-preliminary results and insight into MIS 7 paleoclimate record of the Balkan Peninsula / Marjan Temovski, Kata Molnár, Danny Vargas, Gabriella Ilona Kiss, László Palcsu
Dátum:2022
Tárgyszavak:Természettudományok Földtudományok előadáskivonat
könyvrészlet
Megjelenés:Climate Change : The Karst Record IX (KR9): Programme and abstract / eds. Gina Moseley, Linda Partl, Paul Töchterle, Gabriella Koltai, Mojgan Soleimani, Jonathan Baker, Christoph Spötl. - p. 106-107.
További szerzők:Molnár Kata Vargas Espin, Danny Fernando (1990-) (climate physicist) Kiss Gabriella Ilona (1992-) (vegyész) Palcsu László (1975-) (fizikus)
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5.

001-es BibID:BIBFORM103310
035-os BibID:(WOS)000805561200044 (Scopus)85131125056
Első szerző:Temovski, Marjan
Cím:Combined use of conventional and clumped carbonate stable isotopes to identify hydrothermal isotopic alteration in cave walls / Marjan Temovski, László Rinyu, István Futó, Kata Molnár, Marianna Túri, Attila Demény, Bojan Otoničar, Yuri Dublyansky, Philippe Audra, Victor Polyak, Yemane Asmerom, László Palcsu
Dátum:2022
ISSN:2045-2322
Megjegyzések:Alteration of conventional carbonate stable isotopes (delta O-18, delta C-13) in cave walls has been shown to be a useful tool to identify cave formation driven by deep-seated processes, i.e., hypogene karstification. If combined with a prior information on the paleowater stable isotope composition, further insights can be obtained on the temperature and the source of the paleowater. Clumped isotope composition (Delta(47)) of carbonates is an independent measurement of temperature, and if combined with the conventional stable isotopes, can provide information on the paleowater stable isotope composition. On the example of Provalata Cave (N. Macedonia), we apply for the first time, both conventional and clumped stable isotope analysis, and identify two different isotope alteration trends, reflecting two distinct hydrothermal events: an older, hotter one, where isotope alteration was likely related to isotope diffusion, lowering the delta O-18 values of the carbonate; and a younger one, related to the cave formation by low-temperature CO2-rich thermal waters, with dissolution-reprecipitation as the alteration mechanism, causing decrease in delta O-18 values, and unexpected increase in delta C-13 values. The findings are further corroborated by additional insight from optical petrography and cathodoluminescence microscopy, as well as fluid inclusion analysis of secondary calcite crystals related to the cave forming phase.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Scientific Reports. - 12 : 1 (2022), p. 1-17. -
További szerzők:Rinyu László (fizikus) Futó István (fizikus) Molnár Kata Túri Marianna (1988-) (geográfus-geoinformatikus) Demény Attila Otoničar, Bojan Dublyansky, Yuri Audra, Philippe Polyak, Victor Asmerom, Yemane Palcsu László (1975-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00009
GINOP
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