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001-es BibID:	BIBFORM076379
Első szerző:	Buró Botond (geográfus)
Cím:	Investigation of the periods of sand movement with different dating methods in the Nyírség, Hungary / Buró Botond, Lóki József, Sipos György, Négyesi Gábor, Andrási Bence, Jakab Attila, Félegyházi Enikő, Molnár Mihály
Dátum:	2018
Megjegyzések:	The Nyírség is the second largest sand dune area in the northeastern part of the Carpathian Basin. The Nyírség have been studying for over 100 years but geological and geomorphological research can still contribute to the understanding of the surface development of the area. In the Carpathian Basin the Nyírség is the second largest sand dune area (ca. 4600 km2 ), formed on the alluvial deposits of the Tisza River and its tributaries. At around 25 ka, fluvial processes terminated on the territory; and during the rest of the Pleistocene, aeolian processes prevaile. The strong north-westerly, northerly, north-north-easterly winds formed mostly blowouts, oval shaped sand hummocks and residual ridges. Parabolic sand dunes also evolved on a larger scale in the Nyírség. The first significant sand movement in the Nyírség happened in the Upper Pleniglacial and the Late Glacial. The main landforms of the Nyírség developed at this time. The aeolian transformation of the land has not finished at the end of the Pleistocene. In the Holocene the sand moved within small area, mainly by anthropogenic impact. Our aim is to clarify the age of the wind-blown sand movement periods, with different absolute dating methods (Radiocarbon dating method, OSL) and relative dating methods (palinolgical examinations, archeological finds). We collected soil (Gyüre, Vásárosnamény, Kótaj), charcoal samples (Gégény, Kántorjánosi, Nyíradony, Nagyvarsány, Máriapócs, Petneháza, Gyüre and Lövőpetri) from many sand quarries which contain fossil soil layer for radiocarbon dating. For the OSL measurements samples were collected from Baktalórántháza, Gégény and Kántorjánosi sand quarries. For the palinological analysis we made five boreholes (Máriapócs, Nyírtanya, Nyírábrány, Vámospércs and Nyírlugos) and we visited an archeological excavation near NyíregyházaOros. Different age determination methods supported each other well. The age data support the results of previous researches. In the Nyírség the first major sand movements happened in the cold and drier period of the Upper Pleniglacial and Late Glacial (Baktalórántháza, Máriapócs, Lövőpetri, Nagyvarsány-Szabadságtanya, Gyüre, Petneháza, Nyírábrány). At the end of the Pleistocene the sand movements have not finished in the Nyírség (Gégény, Kántorjánosi). Sand movement in the first half of the Holocene, in the Preboreal and in the Atlantic Phase took place due to climatic and anthropogenic effects also (Gégény, Kántorjánosi, Kótaj). In the Subatlantic Phase, there were many little sand movement periods, mainly caused by anthropogenic impacts (Nyíradony, Nyíregyháza-Oros, Nyírlugos).
ISBN:	978-80-86407-77-7
Tárgyszavak:	Természettudományok Földtudományok előadáskivonat Aeolian activity OSL Radiocarbon dating Pleistocene Holocene Nyírség Hungary
Megjelenés:	Geomorfologický sborník 16 : Proceedings of the conference State of geomorphological research in 2018 / ed. Zdeněk Máčka, Jaroslava Ježková, Eva Nováková, František Kuda. - p. 16-17. -
További szerzők:	Lóki József (1946-) (geográfus) Sipos György (1979-) (geográfus) Négyesi Gábor (1980-) (geográfus) Andrási Bence (1991-) (geográfus) Jakab Attila Patakné Félegyházi Enikő (1944-) (geográfus) Molnár Mihály Négyesi Gábor (1980-) (geográfus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM061983
Első szerző:	Buró Botond (geográfus)
Cím:	Assessing Late Pleistocene and Holocene phases of aeolian activity on the Nyírség alluvial fan, Hungary / Botond Buró, György Sipos, József Lóki, Bence Andrási, Enikő Félegyházi, Gábor Négyesi
Dátum:	2016
ISSN:	1040-6182
Megjegyzések:	There have been several studies addressing the timing and extension of Late Pleistocene and Holocene Aeolian activity in the Nyírség, the former alluvial fan of the Tisza River. Some ofthese already applied numerical dating techniques, however usually focused on one dune formor one site. This paper is an attempt on the one hand to review former age data and on theother hand to add new data from various sites to the landform evolution of the second largestsand dune area of the Carpathian Basin.The paper focuses on the Late Pleistocene - Holocene landform evolution of the secondlargest sand dune area of Hungary (Nyírség). Recent age data were obtained frominvestigations applying several methods (radiocarbon, OSL and palynological examinations)in order to determine the periods of sand movement and paleosoil formation in the area moreaccurately.According to the results, six sand movement periods can be identified during the Late Glacialand Holocen (Oldest Dryas, Younger Dryas, Preboreal Phase, Boreal Phase, Atlantic Phase,Subatlantic Phase).In between periods with intensive aeolian activity paleosoil formation occurred in the Blling-Allerd Interstadial and in the Preboreal and Subatlantic Phases
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban Aeolian activity OSL Radiocarbon dating Late Glacial Holocene Nyírség
Megjelenés:	Quaternary International. - 425 (2016), p. 183-195. -
További szerzők:	Sipos György (1979-) (geográfus) Lóki József (1946-) (geográfus) Andrási Bence (1991-) (geográfus) Patakné Félegyházi Enikő (1944-) (geográfus) Négyesi Gábor (1980-) (geográfus)
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001-es BibID:	BIBFORM060481
Első szerző:	Lóki József (geográfus)
Cím:	Aeolian surface transformations on the alluvial fan of the Nyírség / Lóki József, Négyesi Gábor, Buró Botond, Félegyházi Enikő
Dátum:	2012
ISSN:	2060-3274
Megjegyzések:	The evolution of the Nyírség and its landforms has been widely addressed by Hungarian geographers and geologists in the past and atpresent as well. Early works were mainly concentrating on understanding the complex, fluvial and aeolian genetics of the territory, later morespecific forms and problems were studied and revealed. By the increasing number of chronological evidence derived from stratigraphic,pollen and archaeological data and absolute dating techniques (radiocarbon and optically stimulated luminescence) the geomorphologicaldevelopment can be reconstructed in more detail, especially in thecontext of climate variations and human intervention. Our study aimsto summarize and outline the times of aeolian activity, with specialrespect to Holocene events, on the basis of the researches carried out sofar. By nowadays it is obvious that sand was moving on several occasions in the Nyírség during the Holocene subsequent to the mainaeolian land formation periods of the Upper Pleniglacial and the lateglacial. In the first half of the Holocene sand movement can be relatedto dry periods, thus aeolian activity was driven mostly by climaticfactors. In the second half of the Holocene the area of land affected bywind erosion decreased and in most cases events can be associated tothe activity of man. Nevertheless, climatic and anthropogenic factorscould be superimposed, leading to significant local sand mobilisation.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban wind-blown sand
Megjelenés:	Journal of Environmental Geography. - 5 : 1-2 (2012), p. 21-28. -
További szerzők:	Négyesi Gábor (1980-) (geográfus) Buró Botond (1986-) (geográfus) Patakné Félegyházi Enikő (1944-) (geográfus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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