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001-es BibID:	BIBFORM090692
Első szerző:	Temovski, Marjan
Cím:	Multi-method geochemical characterization of groundwater from a hypogene karst system / Temovski Marjan, Túri Marianna, Futó István, Braun Mihály, Molnár Mihály, Palcsu László
Dátum:	2021
ISSN:	1431-2174
Megjegyzések:	An approach, combining several geochemical methods, was used to determine the groundwater properties and components of a hypogene karst system, where sampling is restricted only to the spring sites, and with a limited number of available sampling locations. Radiogenic isotopes (3H, 14C) were used to constrain the groundwater mean residence time and separate different groundwater components. Noble gases, stable isotopes of water (?18O, ?2H), dissolved inorganic carbon (?13C) and dissolved sulfate (?34S, ?18O), and major ion and trace element composition were used to identify the source of water, its chemical evolution and water?rock interactions, as well as to identify the contribution and composition of endogenic gases. This approach was applied to three low-temperature thermal springs located in Mariovo (North Macedonia) associated with fossil hypogene caves, previously identified by morphological and geochemical studies of caves and cave deposits. Based on the obtained results, the main studied springs represent an output part of a regional hypogene karst groundwater system with a deep-circulating (~1 km), old (~15 ka), thermal (?60 ?C) water, which mixes with young (<50 years), cold (<14 ?C) and shallow epigene karst groundwater. The output parts are structurally controlled, at the interception of low topography and deep faults, along which the groundwater interacts with deep-seated gases, dominantly CO2 of metamorphic origin (?13C of +4.5? VPDB), with some contribution of mantle helium. The thermal karst groundwater interacts at depth with volcanic rocks from the nearby Neogene-Quaternary volcanic complex, as well as with metamorphic basement rocks and granitoids.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk hipogén karszt stabil izotóp Észak-Macedónia karsztvíz
Megjelenés:	Hydrogeology Journal. - 29 (2021), p. 1129-1152. -
További szerzők:	Túri Marianna (1988-) (geográfus-geoinformatikus) Futó István (fizikus) Braun Mihály (1966-) (vegyész, analitikus) Molnár Mihály (1974-) (fizikus) Palcsu László (1975-) (fizikus)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00009 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM083373
Első szerző:	Túri Marianna (geográfus-geoinformatikus)
Cím:	Paleotemperature reconstruction using environmental isotopes and noble gases in groundwater in Morocco / Marianna Túri, Radouan Saadi, Hamid Marah, Marjan Temovski, Mihály Molnár, László Palcsu
Dátum:	2020
ISSN:	1431-2174
Megjegyzések:	A Turonian limestone-dolomite aquifer from the Tadla basin of Morocco was analysed using a multi-tracer approach (?18O, ?2H, ?13C, 3H, 14C and noble gases) to reconstruct the paleotemperature evolution from the late Pleistocene to the Holocene. The Turonian aquifer was found to be suitable for a groundwater-based paleoclimate reconstruction, representing the Holocene?late Pleistocene epochs. After correction for young water contribution, mean residence times (MRTs) of groundwater were calculated using the Pearson radiocarbon model. Additionally, terrigenic helium content was used as an age indicator. Noble gas temperature (NGT) results from wells with groundwater ages corresponding to glacial periods showed an average of 17.2???1.7?C. In contrast, samples of recent recharge water gave a mean NGT of 25.2???1.3?C. This reveals a temperature difference of 8.0???2.1 ?C between the Holocene and late Pleistocene. This significant Pleistocene?Holocene temperature difference observed in Africa has considerable significance and can be extended to address an important topic relating to the nature of the wet epochs during which the fossil aquifers of North Africa were recharged. It is evident that this aquifer was recharged during both interglacial (warm) and glacial (cool) wet periods.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk felszín alatti vizek stabil izotópok radiokarbon nemes gázok
Megjelenés:	Hydrogeology Journal. - 28 (2020), p. 973-986. -
További szerzők:	Saadi, Radouan Marah, Hamid Temovski, Marjan Molnár Mihály Palcsu László (1975-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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