TY - CONF AU - Czuppon, György AU - Demény, Attila AU - Leél-Össy, S AU - Óvári, Mihály AU - Lin, K AU - Molnár, M AU - Karlik, Máté AU - Siklósy, Zoltán AU - Shen Chuan-Chou, S TI - Double negative peak of the 8.2 ky event and subsequent „overshoot” recorded in speleothems from Central Europe T2 - EGU General Assembly 2024 : abstracts PB - European Geosciences Union (EGU) C1 - Wien PY - 2024 DO - 10.5194/egusphere-egu24-18304 UR - https://m2.mtmt.hu/api/publication/34762906 ID - 34762906 N1 - Oral Presentation LA - English DB - MTMT ER - TY - JOUR AU - Casillas, R AU - Ahijado, A AU - Nagy, G AU - Demény, Attila AU - Fernández, C TI - The Esquinzo Ultra-Alkaline Rock Suite of Fuerteventura Basal Complex (Canary Islands): Evidence for Origin of Carbonatites by Fractional Crystallization JF - MINERALS J2 - MINERALS-BASEL VL - 14 PY - 2024 IS - 3 SN - 2075-163X DO - 10.3390/min14030295 UR - https://m2.mtmt.hu/api/publication/34762883 ID - 34762883 AB - The origin of the carbonatites that appear on Earth is one of the most controversial current topics in the petrogenesis of igneous rocks. Situated in the northern sector of the Basal Complex of Fuerteventura (Canary Islands), the Miocene Esquinzo ultra-alkaline plutonic rock complex is composed of pyroxenites, melteigites-ijolites-urtites, malignites-nepheline syenites, carbonatites, silicocarbonatites, nephelinites and nepheline phonolites. This work tries to establish the genesis of this massif of ultra-alkaline rocks with associated carbonatites from Fuerteventura (which are very rare in the oceans). The geochemical characteristics of these rocks and the minerals that are included in them have allowed us to establish their origin. This complex was generated by three successive magmatic events associated with differentiation of melanephelinite magmas emplaced in the oceanic crust. Silicocarbonatite and calciocarbonatite (sövites) dykes are related to the first magmatic event and were formed by fractional crystallization of H2O- and CO2-rich ijolite magmas. The melanephelinite magmas that formed these plutonic ultra-alkaline rocks were apparently generated as partial melts of asthenospheric mantle, which assimilated enriched lithospheric mantle material as they ascended. The upwelling of this large body of anomalous asthenospheric Miocene material exceeded the deformation associated with plate motions and led to an oceanic rifting event in Fuerteventura. LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Berentés, A AU - Rinyu, László AU - Kovács, Ivett AU - Surányi, Gergely AU - Virág, Magdolna TI - Subaqueous carbonate speleothems as paleotemperature archives – clumped isotope thermometry and stable isotope compositions of inclusion-hosted wate JF - INTERNATIONAL JOURNAL OF SPELEOLOGY J2 - INT J SPELEOL VL - 53 PY - 2024 IS - 1 SP - 25 EP - 37 PG - 13 SN - 0392-6672 DO - 10.5038/1827-806X.53.1.2480 UR - https://m2.mtmt.hu/api/publication/34659670 ID - 34659670 N1 - Funding Agency and Grant Number: Balaton Uplands National Park [102-2/2022]; Eotvos Lorand Research Network; European Union [GINOP-2.3.2-15-2016-00009 'ICER']; Hungarian State; European Regional Development Fund; [SA-41/2021] Funding text: The sampling conducted for this study in Berger Karoly Cave was permitted by the directorate of the Balaton Uplands National Park (No. 102-2/2022) . Rezso Szilaj and Denes Szieberth provided essential help during sampling in Berger Karoly and Molnar Janos caves, respectively. The authors are indebted to Ariana Gugora for polishing the English of the manuscript. Constructive reviews and helpful comments of three anonymous reviewers, and the editorial handling by Bogdan P. Onac are gratefully thanked. The study was financed by the Eotvos Lorand Research Network (projects SA-41/2021; ELKH KEP-1/2020) . The clumped isotope facility of the Institute for Nuclear Research was supported by the European Union and the Hungarian State, co -financed by the European Regional Development Fund in the project of GINOP-2.3.2-15-2016-00009 'ICER'. LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Bondár, Mária (Ködmönné) AU - Karlik, Máté AU - Hegyi, I AU - Hatvani, István Gábor AU - Facsády, Annamária AU - Csontos, Katalin AU - Gugora, Ariana AU - Kara-Gülbay, R AU - Carlos García-Ramos, J AU - Caldwell Steele, S TI - Provenance groups in a Roman jet jewelry collection at Aquincum (Budapest, Hungary) and comparison with jet and jet-like gemstones JF - JOURNAL OF ARCHAEOLOGICAL SCIENCE: REPORTS J2 - J ARCHAEOL SCI REP VL - 54 PY - 2024 SN - 2352-409X DO - 10.1016/j.jasrep.2024.104413 UR - https://m2.mtmt.hu/api/publication/34570417 ID - 34570417 LA - English DB - MTMT ER - TY - JOUR AU - Bujtor, László AU - Demény, Attila AU - Németh, Péter AU - Bajnóczi, Bernadett TI - Laevaptychi as reliable paleotemperature archives: high-resolution stable isotope compositions of Kimmeridgian (Jurassic) lamellar structured aspidoceratid lower mandibles from Zengővárkony (Mecsek Mountains, Hungary) JF - INTERNATIONAL JOURNAL OF EARTH SCIENCES J2 - INT J EARTH SCI VL - 113 PY - 2024 SP - 353 EP - 367 PG - 15 SN - 1437-3254 DO - 10.1007/s00531-023-02376-5 UR - https://m2.mtmt.hu/api/publication/34538363 ID - 34538363 N1 - Institute of Geography and Environmental Sciences, Eszterházy Károly Catholic University, 6-8 Leányka Street, Eger, 3300, Hungary HUN-REN CSFK, MTA Centre of Excellence, Konkoly Thege Miklós út 15-17., Budapest, 1121, Hungary Institute for Geological and Geochemical Research, HUN-REN Research Centre for Astronomy and Earth Sciences, Budaörsi út 45, Budapest, 1112, Hungary Export Date: 18 February 2024 CODEN: IJESF Correspondence Address: Bujtor, L.; Institute of Geography and Environmental Sciences, 6-8 Leányka Street, Hungary; email: bujtor.laszlo@uni-eszterhazy.hu Correspondence Address: Demény, A.; Institute for Geological and Geochemical Research, Budaörsi út 45, Hungary; email: demeny.attila@csfk.org AB - Fieldwork provided well-preserved Laevaptychus sp. ex gr. hoplisus – obliquus specimens from the lower Kimmeridgian of Zengővárkony (Mecsek Mountains, south Hungary). This study presents the stable isotope analysis of these aptychi and control samples from brachiopods ( Nucleata and Pygope ) derived from the Zengővárkony section bed 3. Rarely observed structures in the upper lamellar layers of the studied laevaptychi revealed 24–32 concentric lamellae that represent primary textural features and indicate excellent preservation. After careful screening for diagenetic effects, stable oxygen isotope compositions yielded seawater temperatures between 20 and 26 °C in good agreement with earlier studies on Jurassic formations, with improved precision. Our research presents for the first time that well-preserved laevaptychi may be a reliable data source for paleoclimate and paleotemperature reconstructions. LA - English DB - MTMT ER - TY - JOUR AU - Li, XL AU - Chen, YX AU - Zhou, K AU - Xiong, JW AU - Demény, Attila AU - Schertl, HP AU - Huang, F TI - Iron mobility in subduction zone fluids at forearc depths and implications for mantle redox heterogeneity JF - CHEMICAL GEOLOGY J2 - CHEM GEOL VL - 644 PY - 2024 SN - 0009-2541 DO - 10.1016/j.chemgeo.2023.121879 UR - https://m2.mtmt.hu/api/publication/34451125 ID - 34451125 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Czuppon, György AU - Kern, Zoltán AU - Hatvani, István Gábor AU - Topál, Dániel AU - Karlik, Máté AU - Surányi, Gergely AU - Molnár, Mihály AU - Kiss, Gabriella Ilona AU - Szabó, Máté Zoltán AU - Shen, CC AU - Hu, HM AU - May, Zoltán TI - A speleothem record of seasonality and moisture transport around the 8.2 ka event in Central Europe (Vacska Cave, Hungary) JF - QUATERNARY RESEARCH J2 - QUATERNARY RES VL - 118 PY - 2024 SP - 195 EP - 210 PG - 16 SN - 0033-5894 DO - 10.1017/qua.2023.33 UR - https://m2.mtmt.hu/api/publication/34082661 ID - 34082661 N1 - Published online: 28 July 2023 LA - English DB - MTMT ER - TY - CHAP AU - Demény, Attila AU - Gugora, Ariana AU - Somogyvári-Lajtár, Enikő AU - Farkas, Csaba AU - Hegyi, I AU - Palcsu, László AU - Horváth, A ED - Bondár, Mária (Ködmönné) TI - Rézkori temetők csontvázleleteinek stabilizotóp-geokémiai elemzése T2 - Késő rézkori temetkezések régészeti és bioarcheológiai elemzése PB - Archaeolingua CY - Budapest SN - 9786155766671 PY - 2023 SP - 591 EP - 611 PG - 21 DO - 10.62150/BM.KRT.2023_12 UR - https://m2.mtmt.hu/api/publication/34583678 ID - 34583678 LA - Hungarian DB - MTMT ER - TY - CONF AU - Czuppon, György AU - Demény, Attila AU - Karlik, Máté AU - Siklósy, Zoltán AU - Leél-Őssy, Szabolcs AU - Óvári, Mihály AU - Surányi, Gergely AU - Molnár, M AU - Lin, K AU - Shen, CC ED - Bojar, AV ED - Tichy, G ED - Bojar, HP ED - Moser, B ED - Wojtowicz, A ED - Pelc, A ED - Neubauer, F TI - The “overshoot” following 8.2 ky event recorded in speleothem from Béke Cave (NE Hungary) T2 - European Society for Isotope Research Meeting XVI (ESIR) PY - 2023 SP - 29 EP - 30 PG - 2 UR - https://m2.mtmt.hu/api/publication/34546173 ID - 34546173 LA - English DB - MTMT ER - TY - CONF AU - Czuppon, György AU - Demény, Attila AU - Palcsu, L AU - Braun, M AU - Stieber, J AU - Dobosy, P ED - Bojar, AV ED - Tichy, G ED - Bojar, HP ED - Moser, B ED - Wojtowicz, A ED - Pelc, A ED - Neubauer, F TI - Cave monitoring in Hungarian: preliminary results from Ca and Mg isotopes analyses of drip water T2 - European Society for Isotope Research Meeting XVI (ESIR) PY - 2023 SP - 28 UR - https://m2.mtmt.hu/api/publication/34546148 ID - 34546148 LA - English DB - MTMT ER -