TY - JOUR AU - Attila, Péntek AU - Molnár, Ferenc AU - David, H Watkinson AU - Peter, C Jones AU - Aberra, Mogessie TI - Partial melting and melt segregation in footwall units within the contact aureole of the Sudbury Igneous Complex (North and East Ranges, Sudbury structure), with implications for their relationship to footwall Cu–Ni–PGE mineralization JF - INTERNATIONAL GEOLOGY REVIEW J2 - INT GEOL REV VL - 53 PY - 2011 IS - 2 SP - 291 EP - 325 PG - 35 SN - 0020-6814 DO - 10.1080/00206810903101313 UR - https://m2.mtmt.hu/api/publication/2421702 ID - 2421702 N1 - Department of Mineralogy, Eötvös Loránd University, Pazmány Péter sétány, 1/C, Budapest 1117, Hungary Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6, Canada Institute for Earth Sciences, Karl-Franzens University, 2 Universitätsplatz, Graz 8010, Austria Cited By :14 Export Date: 20 December 2022 Correspondence Address: Péntek, A.; Department of Mineralogy, Pazmány Péter sétány, 1/C, Budapest 1117, Hungary; email: attilapentek@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Martin, U AU - Németh, Károly TI - Blocky versus fluidal peperite textures developed in volcanic conduits, vents and crater lakes of phreatomagmatic volcanoes in Mio/Pliocene volcanic fields of Western Hungary JF - JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH J2 - J VOLCANOL GEOTH RES VL - 159 PY - 2007 IS - 1-3 SP - 164 EP - 178 PG - 15 SN - 0377-0273 DO - 10.1016/j.jvolgeores.2006.06.010 UR - https://m2.mtmt.hu/api/publication/21749655 ID - 21749655 AB - Volcanic fields in the Pannonian Basin, Western Hungary, comprise several Mio/Pliocene volcaniclastic successions that are penetrated by numerous mafic intrusions. Peperite formed where intrusive and extrusive basaltic magma mingled with tuff, lapilli-tuff, and non-volcanic siliciclastic sediments within vent zones. Peperite is more common in the Pannonian Basin than generally realised and may be also important in other settings where sediment sequences accumulate during active volcanism. Hajagos-hegy, an erosional remnant of a maar volcano, was subsequently occupied by a lava lake that interacted with unconsolidated sediments in the maar basin and formed both blocky and globular peperite. Similar peperite developed in Kissomlyo, a small tuff ring remnant, where dykes invaded lake sediments that formed within a tuff ring. Lava foot peperite from both Hajagos-hegy and Kissomlyo were formed when small lava flows travelled over wet sediments in craters of phreatomagmatic volcanoes. At Sag-hegy, a large phreatomagmatic volcanic complex, peperite formed along the margin of a coherent intrusion. All peperite in this study could be described as globular or blocky peperite. Globular and blocky types in the studied fields occur together regardless of the host sediment. (c) 2006 Elsevier B.V. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Gméling, Katalin AU - Harangi, Szabolcs AU - Kasztovszky, Zsolt TI - Boron and chlorine concentration of volcanic rocks: an application of prompt gamma activation analysis JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY J2 - J RADIOANAL NUCL CHEM VL - 265 PY - 2005 IS - 2 SP - 201 EP - 212 PG - 12 SN - 0236-5731 DO - 10.1007/s10967-005-0810-x UR - https://m2.mtmt.hu/api/publication/1248735 ID - 1248735 N1 - Megjegyzés-20636571 UR: http://www.scopus.com/inward/record.url?eid=2-s2.0-22544436953&partnerID=40 Megjegyzés-21970212 Chemicals/CAS: boron, 7440-42-8; chlorine, 13981-72-1, 7782-50-5; gadolinium, 7440-54-2; niobium, 7440-03-1; samarium, 7440-19-9; scandium, 10361-84-9, 7440-20-2 Megjegyzés-21970853 Chemicals/CAS: boron, 7440-42-8; chlorine, 13981-72-1, 7782-50-5; gadolinium, 7440-54-2; niobium, 7440-03-1; samarium, 7440-19-9; scandium, 10361-84-9, 7440-20-2 Megjegyzés-22005406 Chemicals/CAS: boron, 7440-42-8; chlorine, 13981-72-1, 7782-50-5; gadolinium, 7440-54-2; niobium, 7440-03-1; samarium, 7440-19-9; scandium, 10361-84-9, 7440-20-2 Megjegyzés-21962161 Chemicals/CAS: boron, 7440-42-8; chlorine, 13981-72-1, 7782-50-5; gadolinium, 7440-54-2; niobium, 7440-03-1; samarium, 7440-19-9; scandium, 10361-84-9, 7440-20-2 Export Date: 12 January 2019 CODEN: JRNCD AB - Boron and chlorine concentrations in geological standards and in representative volcanic rock samples were determined by prompt gamma activation analysis (PGAA). The results of the GSJ standard measurements proved the high precision of PGAA in measuring the boron, chlorine, other trace elements (Sc, Nd, Sm, and Gd) and the major element contents of the samples. The rock samples originate from the western part of the Northern-Pannonian Volcanic Field (NPVF), which includes the Central Slovakian Volcanic Field (CSVF), the Borzsony and the Visegrad Mts. (VMt.). The oldest 16-13.5 Ma samples as the first products of the Miocene calc-alkaline volcanism are the most enriched in B (11-29 mu g/g), whereas the primitive basaltic andesites (from CSVF), the latest products (9 Ma) of the volcanic activity have lower B content (8-9 mu g/g). The measured B concentrations correlate positively with fluid-mobile elements, and the trace element pattern of the samples show subduction related signatures. The chlorine content of the investigated samples shows wide variation between 42.62 and 1148.45 mu g/g. The 9 Ma samples from the CSVF show Cl contents between 150-160 mu g/g. In agreement with the latest geodynamic models of the Neogene calc-alkaline volcanism(1,2) in the NPVF during the shallow, prograding subduction, the fluid-mobile elements metasomatized the mantle wedge. Thus the oldest volcanic rocks have relatively higher B (>11 mu g/g) and high but variable Cl contents. As the subduction waned and extension proceeded, the magma generation region changed to a not thoroughly metasomatized mantle by the former subduction event, resulting in lower B, low and stable Cl content of the younger (9 Ma) volcanic rocks. LA - English DB - MTMT ER - TY - JOUR AU - Horváth, Zoltán AU - Csákiné Michéli, Erika AU - Mindszenty, Andrea AU - Berényi Üveges, Judit TI - Soft-sediment deformation structures in Late Miocene-Pleistocene sediments on the pediment of the Matra Hills (Visonta, Atkar, Verseg): Cryoturbation, load structures or seismites? JF - TECTONOPHYSICS J2 - TECTONOPHYSICS VL - 410 PY - 2005 IS - 1-4 SP - 81 EP - 95 PG - 15 SN - 0040-1951 DO - 10.1016/j.tecto.2005.08.012 UR - https://m2.mtmt.hu/api/publication/1037022 ID - 1037022 AB - The studied area, built up by silty clayey and partly sandy sediments and paleosols, lies on the tectonically active Northern margins of the Pannonian Basin. Wavy, sagging load casts can be observed in the upper part of the Late Miocene alluvial complex and larger scale sagging load casts, flame structures, drops and pillows detected in its Quaternary cover were studied in detail, in order to understand the origins of soft sediment deformation which characterized this young sedimentary suite. Sedimentological, paleopedological and mineralogical observations suggest that:One of the reasons for the soft-sediment deformation might have been the relatively low cohesive strength of the predominantly smectitic sediment covering a gentle slope similar to the actual landscape.On such a surface, the down-slope gravitational component of the mud- blanket might easily have been sufficient to overcome its cohesive strength.Frost action traceable in the studied formations might also have contributed to the observed deformation, particularly along the eroded top of the Late Miocene sediments. Combined evidence from field observations and laboratory analyses support the idea that liquefaction fluidization was of prime importance in bringing about the observed structures. In conclusion two alternative Quaternary/Holocene scenarios are proposed, which might have resulted in the unusual behaviour of the sediments/paleosols. One is a seismic event, the other is the combined effect of freeze thaw cycles and of the sloping foothill position, which might have resulted in episodic downslope transport and the associated deformation of the eroded soil material when its water content surpassed a certain threshold. We accept that the anomalous abundance of soft-sediment deformation in this marginal position may be causally related to paleo-earthquakes, but the obvious complexity of the phenomenon requires caution. In case the proposed scenarios would not have been alternatives but acted simultaneously, the analysed phenomena were to be interpreted as the joint results of tectonics and climate change. LA - English DB - MTMT ER - TY - BOOK AU - Martin, U AU - Németh, Károly TI - Mio/Pliocene phreatomagmatic volcanism in the western Pannonian Basin T3 - Geologica Hungarica, Series Geologica ; 26. PB - Magyar Állami Földtani Intézet (MÁFI) CY - Budapest PY - 2004 SP - 191 SN - 9636712387 UR - https://m2.mtmt.hu/api/publication/1384567 ID - 1384567 LA - English DB - MTMT ER - TY - JOUR AU - Martin, U AU - Németh, Károly TI - Peperitic lava lake-fed sills at Sag-hegy, western Hungary: A complex interaction of a wet tephra ring and lava JF - GEOLOGICAL SOCIETY SPECIAL PUBLICATIONS J2 - GEOL SOC SPEC PUBL VL - 234 PY - 2004 IS - Freiberg SP - 33 EP - 50 PG - 18 SN - 0305-8719 DO - 10.1144/GSL.SP.2004.234.01.04 UR - https://m2.mtmt.hu/api/publication/25754044 ID - 25754044 N1 - Geological Society of London Special Publication AB - Sag-hegy is the remnant of a complex volcano consisting of several phreatomagmatic pyroclastic sequences preserved in immediate contact with a thick (c. 50 m) coherent lava body. Due to the intensive quarrying, the inner part of the lava has been removed, leaving behind a castle-like architecture of pyroclastic rocks. The outcrop walls thus demonstrate the irregular morphology of the lava, which was emplaced in a NW-SE-trending ellipsoidal vent zone in a phreatomagmatic volcano. Pyroclastic beds in the quarry wall are cross-cut by dykes and sills, inferred to have been fed from a central magma zone. Thin (< 10 cm) strongly chilled, black, angularly jointed aphanitic basaltic lava mantles the pyroelastic sequence, and has a corrugated margin as a consequence of sudden chilling against the cold and wet phreatomagmatic tephra in the inner wall of the tuft ring crater. These corrugated zones are inferred to be a characteristic textural feature, indicating extensive mixing of lava and host tephra which led to peperite formation along the outer rim lava lake. A spectrum of peperite formed along the lake margin, and fluid oscillation, due to fluidization of the wet tephra, disrupted a steam envelope formed around the lava, causing basaltic magma to invade and mix with the phreatomagmatic tephra. The presence of unconformities in the tephra ring facilitated the formation of sills fed from the central lava body. LA - English DB - MTMT ER - TY - CHAP AU - Révay, Zsolt AU - Belgya, Tamás ED - Molnár, Gábor TI - Principles of PGAA method T2 - Handbook of Prompt Gamma Activation Analysis with Neutron Beams PB - Kluwer Academic Publishers CY - Dordrecht SN - 9781402013041 PY - 2004 SP - 1 EP - 30 PG - 30 DO - 10.1007/978-0-387-23359-8_1 UR - https://m2.mtmt.hu/api/publication/1805949 ID - 1805949 LA - English DB - MTMT ER - TY - JOUR AU - Pécskay, Zoltán AU - Molnár, Ferenc TI - Relationships between volcanism and hydrothermal activity in the Tokaj Mountains, Northeast Hungary, based on K-Ar ages JF - GEOLOGICA CARPATHICA J2 - GEOL CARPATH VL - 53 PY - 2002 IS - 5 SP - 303 EP - 314 PG - 12 SN - 1335-0552 UR - https://m2.mtmt.hu/api/publication/148644 ID - 148644 AB - Conventional K-Ar studies of volcanic rocks, rock-forming minerals and hydrothermal adularia and alunite from different volcanic centres of the Tokaj Mts indicate that volcanic activity took place between 15.2 and 9.4 Ma (Badenian-Sarmatian-Pannonian). In the northern part of the Tokaj Mts, ages for the relatively deeply eroded hydrothermal systems (Rudabanyacska and Telkibanya Au-Ag deposits and parts of the Regec caldera), formed mainly by the adularia-bearing low-sulphidation epithermal deposits, are between 13.0 and 12.2 Ma. These systems were developed within andesitic-dacitic volcanic centres with calderas and subvolcanic intrusions. In the southern parts of the Tokaj Mts (near Mad and in the Szerenes Hills region) exposures of hydrothermal systems mainly represent shallow acid-sulphate steam-heated zones of low-sulphidation-type systems, and the K-Ar ages are between 12.1 and 10.4 Ma. Radiometric ages also suggest that in some parts of this latter area, repeated hydrothermal activity occurred, suggesting that hydrothermal circulation developed in relation to different magmatic centres that were active at different times. LA - English DB - MTMT ER - TY - JOUR AU - Bajnóczi, Bernadett AU - Molnár, Ferenc AU - Maeda, K AU - Izawa, E TI - Shallow level low-sulphidation type epithermal systems in the Regéc caldera, Central Tokaj Mts., NE-Hungary JF - GEOLOGICA CARPATHICA J2 - GEOL CARPATH VL - 51 PY - 2000 IS - 4 SP - 217 EP - 227 PG - 11 SN - 1335-0552 UR - https://m2.mtmt.hu/api/publication/1070159 ID - 1070159 LA - English DB - MTMT ER - TY - JOUR AU - Kasztovszky, Zsolt AU - Révay, Zsolt AU - Belgya, Tamás AU - Fazekas, B AU - Östör, J AU - Molnár, Gábor AU - Molnár, G AU - Borossay, J TI - Investigation of impurities in thermoluminescent Al2O3 materials by prompt-gamma activation analysis JF - JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY J2 - J ANAL ATOM SPECTROM VL - 14 PY - 1999 IS - 4 SP - 593 EP - 596 PG - 4 SN - 0267-9477 DO - 10.1039/a808857h UR - https://m2.mtmt.hu/api/publication/1233769 ID - 1233769 N1 - [3096] AB - alpha-Al2O3 is one of the most important materials for thermoluminescence dosimetry. The thermoluminescent features are strongly affected by impurities, which were investigated with the non-destructive method of prompt-gamma activation analysis (PGAA). Impurities in four samples of thermoluminescent alumina materials were investigated. The precision and reproducibility of the PGAA method were also tested on standard samples spiked with B, Na, S, Cl, Fe, Cu and Ag. LA - English DB - MTMT ER - TY - CHAP AU - Molnár, Ferenc AU - Zelenka, T AU - Mátyás, E AU - Pécskay, Zoltán AU - Bajnóczi, Bernadett AU - Kiss, János AU - Horváth, I ED - Molnár, Ferenc ED - Lexa, J ED - Hedenquist, JW TI - Epithermal mineralization of the Tokaj Mountains, Northeast Hungary: Shallow levels of low-sulfidation type systems T2 - Epithermal mineralization of the Western Carpathians PB - Society of Economic Geologists CY - Littleton (CO) SN - 9781887483315 T3 - Society of Economic Geologists Guidebook Series ; 31. PY - 1999 SP - 109 EP - 153 PG - 45 UR - https://m2.mtmt.hu/api/publication/1070190 ID - 1070190 LA - English DB - MTMT ER - TY - CHAP AU - Belgya, Tamás AU - Révay, Zsolt AU - Fazekas, B AU - Héjja, I AU - Dabolczi, L AU - Molnár, Gábor AU - Kis, Zoltán AU - Östör, J AU - Kaszás, GY ED - Molnár, Gábor ED - Belgya, Tamás ED - Révay, Zsolt TI - The new Budapest capture gamma-ray facility T2 - Proc. 9th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics PB - Springer Netherlands CY - Budapest CY - Berlin SN - 9637775552 PY - 1997 SP - 826 EP - 837 PG - 12 UR - https://m2.mtmt.hu/api/publication/1233763 ID - 1233763 LA - English DB - MTMT ER - TY - JOUR AU - Molnár, Gábor AU - Belgya, Tamás AU - Dabolczi, L AU - Fazekas, B AU - Révay, Zsolt AU - Veres, Árpád AU - Bikit, I AU - Östör, J TI - The New Prompt Gamma Activation Facility at Budapest JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY J2 - J RADIOANAL NUCL CHEM VL - 215 PY - 1997 IS - 1 SP - 111 EP - 115 PG - 5 SN - 0236-5731 DO - 10.1007/BF02109886 UR - https://m2.mtmt.hu/api/publication/1233764 ID - 1233764 AB - Prompt gamma-activation analysis (PGAA) is an important complementary technique to conventional instrumental activation analysis that can be successfully used in a number of cases when INAA is not applicable. Therefore, a PGAA facility has been constructed at the recently refurbished and upgraded Budapest Research Reactor. It occupies the end position of a new curved thermal guide of 30 m length and 2.5 x 10 cm(2) cross section which provides a clean beam of low energy neutrons. The sophisticated HPGe-BGO gamma-ray spectrometer system can be operated in Compton-suppression and pair-spectrometer modes simultaneously. The octal splining of the main EGO improves efficient pair mode operation when coincidences between pairs of opposite segments and the HPGe detector are required separately. Gamma-gamma coincidence measurements will also be possible when the new multiparameter data acquisition system is completed. One of the main tasks at the new facility will be the accumulation of new spectroscopic data for detector calibration and standardisation, as well as for the construction of a more accurate prompt gamma-ray library for the chemical elements. Various applications are planned, such as the determination of hydrogen in fullerenes and of toxic trace elements in environmental samples. LA - English DB - MTMT ER - TY - JOUR AU - Székyné, Fux V AU - Balogh, Kadosa AU - Szakáll, Sándor TI - A Tokaji-hegység intermedier és bázisos vulkánosságának kora és időtartama a K/Ar vizsgálatok tükrében. JF - FÖLDTANI KÖZLÖNY J2 - FÖLDTANI KÖZLÖNY VL - 111 PY - 1981 IS - 3-4 SP - 413 EP - 423 PG - 11 SN - 0015-542X UR - https://m2.mtmt.hu/api/publication/1538712 ID - 1538712 LA - English DB - MTMT ER -