TY - JOUR AU - Papp, László AU - Palcsu, László AU - Major, Zoltán AU - Rinyu, László AU - Toth, I TI - A mass spectrometric line for tritium analysis of water and noble gas measurements from different water amounts in the range of microlitres and millilitres JF - ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES J2 - ISOT ENVIRON HEALT S VL - 48 PY - 2012 IS - 4 SP - 494 EP - 511 PG - 18 SN - 1025-6016 DO - 10.1080/10256016.2012.679935 UR - https://m2.mtmt.hu/api/publication/2105783 ID - 2105783 N1 - CT 11th Isotope Workshop of the European-Society-for-Isotope- Research (ESIR) CY JUL 04-08, 2011 CL Budapest, HUNGARY Megjegyzés-23457069 FN: Thomson Reuters Web of Knowledge Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary Isotoptech Co. Ltd., Debrecen, Hungary Export Date: 14 December 2020 CODEN: IEHSF Correspondence Address: Palcsu, L.; Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary; email: palcsu@atomki.hu AB - This paper describes the procedure followed for noble gas measurements for litres, millilitres and microlitres of water samples in our laboratory, including sample preparation, mass spectrometric measurement procedure, and the complete calibrations. The preparation line extracts dissolved gases from water samples of volumes of 0.2 mu l to 31 and it separates them as noble and other chemically active gases. Our compact system handles the following measurements: (i) determination of tritium concentration of environmental water samples by the He-3 ingrowth method; (ii) noble gas measurements from surface water and groundwater; and (iii) noble gas measurements from fluid inclusions of solid geological archives (e. g. speleothems). As a result, the tritium measurements have a detection limit of 0.012 TU, and the expectation value (between 1 and 20 TU) is within 0.2% of the real concentrations with a standard deviation of 2.4 %. The reproducibility of noble gas measurements for water samples of 20-40 ml allows us to determine solubility temperatures by an uncertainty better than 0.5 degrees C. Moreover, noble gas measurements for tiny water amounts (in the microlitre range) show that the results of the performed calibration measurements for most noble gas isotopes occur with a deviation of less than 2 %. Theoretically, these precisions for noble gas concentrations obtained from measurements of waters samples of a few microlitres allow us to determine noble gas temperatures by an uncertainty of less than 1 degrees C. Here, we present the first noble gas measurements of tiny amounts of artificial water samples prepared under laboratory conditions. LA - English DB - MTMT ER - TY - JOUR AU - Varsanyi, I AU - Palcsu, László AU - Kovacs, LO TI - Groundwater flow system as an archive of palaeotemperature: Noble gas, radiocarbon, stable isotope and geochemical study in the Pannonian Basin, Hungary JF - APPLIED GEOCHEMISTRY J2 - APPL GEOCHEM VL - 26 PY - 2011 IS - 1 SP - 91 EP - 104 PG - 14 SN - 0883-2927 DO - 10.1016/j.apgeochem.2010.11.006 UR - https://m2.mtmt.hu/api/publication/1495864 ID - 1495864 N1 - Megjegyzés-22362258 Z9: 3 WC: Geochemistry & Geophysics Export Date: 14 December 2020 CODEN: APPGE Correspondence Address: Varsányi, I.; Department of Mineralogy, Geochemistry and Petrology, University of Szeged, P.O. Box 651, H-6701 Szeged, Hungary; email: varsanyi@geo.u-szeged.hu LA - English DB - MTMT ER - TY - JOUR AU - Czuppon, György AU - Matsumoto, T AU - Matsuda, J AU - Everard, J AU - Sutherland, L TI - Noble gases in anhydrous mantle xenoliths from Tasmania in comparison with other localities from eastern Australia: Implications for the tectonic evolution JF - EARTH AND PLANETARY SCIENCE LETTERS J2 - EARTH PLANET SC LETT VL - 299 PY - 2010 IS - 3-4 SP - 317 EP - 327 PG - 11 SN - 0012-821X DO - 10.1016/j.epsl.2010.09.012 UR - https://m2.mtmt.hu/api/publication/1705320 ID - 1705320 LA - English DB - MTMT ER - TY - JOUR AU - Gwalani, LG AU - Rogers, KA AU - Demény, Attila AU - Groves, DI AU - Ramsay, R AU - Beard, A AU - Downes, PJ AU - Eves, A TI - The Yungul carbonatite dykes associated with the epithermal fluorite deposit at Speewah, Kimberley, Australia: carbon and oxygen isotope constraints on their origin JF - MINERALOGY AND PETROLOGY J2 - MINER PETROL VL - 98 PY - 2010 IS - 1-4 SP - 123 EP - 141 PG - 19 SN - 0930-0708 DO - 10.1007/s00710-009-0102-1 UR - https://m2.mtmt.hu/api/publication/1323037 ID - 1323037 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Siklósy, Zoltán TI - Combination of off-line preparation and continuous flow mass spectrometry: D/H analyses of inclusion waters JF - RAPID COMMUNICATIONS IN MASS SPECTROMETRY J2 - RAPID COMMUN MASS SPECTR VL - 22 PY - 2008 IS - 8 SP - 1329 EP - 1334 PG - 6 SN - 0951-4198 DO - 10.1002/rcm.3473 UR - https://m2.mtmt.hu/api/publication/1237884 ID - 1237884 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Ahijado, A AU - Casillas, R AU - Boyce, A J AU - Fallick, A E TI - Crustal contamination of carbonatites indicated by d34S-d13C correlations: Canary Islands, Spain. JF - REVISTA DE LA SOCIEDAD GEOLOGICA DE ESPANA J2 - REV SOC GEOL ESP VL - 12 PY - 1999 IS - 3-4 SP - 453 EP - 460 PG - 8 SN - 0214-2708 UR - https://m2.mtmt.hu/api/publication/1016510 ID - 1016510 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Ahijado, A AU - Casillas, R AU - Vennemann, T W TI - Crustal contamination and fluid/rock interaction in the carbonatites of Fuerteventura (Canary Islands, Spain): a C, O, H isotope study JF - LITHOS J2 - LITHOS VL - 44 PY - 1998 IS - 3-4 SP - 101 EP - 115 PG - 15 SN - 0024-4937 DO - 10.1016/S0024-4937(98)00050-4 UR - https://m2.mtmt.hu/api/publication/1016505 ID - 1016505 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Harangi, Szabolcs TI - Stable isotope studies on carbonate formations in alkaline basalt and lamprophyre series: evolution of magmatic fluids and magma-sediment interactions. JF - LITHOS J2 - LITHOS VL - 37 PY - 1996 IS - 4 SP - 335 EP - 349 PG - 15 SN - 0024-4937 DO - 10.1016/0024-4937(95)00029-1 UR - https://m2.mtmt.hu/api/publication/1016484 ID - 1016484 N1 - Cited By :62 Export Date: 31 March 2023 Correspondence Address: Demény, A.; Laboratory for Geochemical Research, Budaörsi út 45, Budapest, H-1112, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila TI - H isotope fractionation due to hydrogen-zinc reactions and its implications on D/H analysis of water samples JF - CHEMICAL GEOLOGY J2 - CHEM GEOL VL - 121 PY - 1995 IS - 1-4 SP - 19 EP - 25 PG - 7 SN - 0009-2541 DO - 10.1016/0009-2541(94)00155-2 UR - https://m2.mtmt.hu/api/publication/1016474 ID - 1016474 LA - English DB - MTMT ER - TY - JOUR AU - Demény, Attila AU - Fórizs, István AU - Molnár, Ferenc TI - Stable isotope and chemical compositions of carbonate ocelli and veins in Mesozoic lamprophyres of Hungary JF - EUROPEAN JOURNAL OF MINERALOGY J2 - EUR J MINERAL VL - 6 PY - 1994 IS - 5 SP - 679 EP - 690 PG - 12 SN - 0935-1221 DO - 10.1127/ejm/6/5/0679 UR - https://m2.mtmt.hu/api/publication/1016305 ID - 1016305 LA - English DB - MTMT ER - TY - JOUR AU - BALLENTINE, CJ AU - ONIONS, RK AU - OXBURGH, ER AU - Horváth, Ferenc AU - Deák, József TI - RARE-GAS CONSTRAINTS ON HYDROCARBON ACCUMULATION, CRUSTAL DEGASSING AND GROUNDWATER-FLOW IN THE PANNONIAN BASIN JF - EARTH AND PLANETARY SCIENCE LETTERS J2 - EARTH PLANET SC LETT VL - 105 PY - 1991 IS - 1-3 SP - 229 EP - 246 PG - 18 SN - 0012-821X DO - 10.1016/0012-821X(91)90133-3 UR - https://m2.mtmt.hu/api/publication/1255442 ID - 1255442 AB - The isotopic composition and abundances of He, Ne and Ar have been measured in a sequence of vertically stacked gas reservoirs at Hajduszoboszlo and Ebes, in the Pannonian Basin of Hungary. The gas reservoirs occur at depths ranging from 727 to 1331 m, are CH4 dominated and occupy a total rock volume of approximately 1.5 km3. There are systematic variations in both major species abundances and rare gas isotopic composition with depth: CO2 and N2 both increase from 0.47 and 1.76% to 14.1 and 30.5%, respectively, and Ar-40/Ar-36 and Ne-21/Ne-22 increase systematically from 340 and 0.02990 at 727 m to 1680 and 0.04290 at 1331 m. A mantle-derived He component between 2 and 5% is present in all samples, the remainder is crustal-radiogenic He. The Ar and Ne isotope variations arise from mixing between atmosphere-derived components in groundwater, and crustally produced radiogenic Ar and Ne. The atmosphere-derived Ar-40 and Ne-21 decreases from 85 and 97% of the total Ar-40 and Ne-21 at 727 m to 18 and 68% at 1331 m. The deepest samples are shown to have both atmosphere-derived and radiogenic components close to the air-saturated water and radiogenic production ratios. The shallowest samples show significant fractionation of He/Ar and Ne/Ar ratios in atmosphere-derived and radiogenic rare gas components, but little or no fractionation of He/Ne ratios. This suggests that diffusive fractionation of rare gases is relatively unimportant and that rare gas solubility partitioning between CH4 and H2O phases controls the observed rare gas elemental abundances. The total abundance of atmosphere-derived and radiogenic rare gas components in the Hajduszoboszlo gas field place limits on the minimum volume of groundwater that has interacted with the natural gas, and the amount of crust that has degassed and supplied radiogenic rare gases. The radiogenic mass balance cannot be accounted for by steady state production either within the basin sediments or the basement complex since basin formation. The results require that radiogenic rare gases are stored at their production ratios on a regional scale and transported to the near surface with minimal fractionation. The minimum volume of groundwater required to supply the atmosphere-derived rare gases would occupy a rock volume of some 1000 km3 (assuming an average basin porosity of 5%), a factor of 670 greater than the reservoir volume. Interactions between groundwater and the Hajduszoboszlo hydrocarbons has been on a greater scale than often envisaged in models of hydrocarbon formation and migration. LA - English DB - MTMT ER -