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001-es BibID:	BIBFORM079443
Első szerző:	Buczkó Krisztina (biológus)
Cím:	Diatom-based evidence for abrupt climate changes during the Late Glacial in the Southern Carpathian Mountains / Buczkó Krisztina, Magyari Enikő K., Soróczki-Pintér Éva, Hubay Katalin, Braun Mihály, Bálint Miklós
Dátum:	2009
ISSN:	1788-2281 1789-3348
Megjegyzések:	A high-resolution paleolimnological record from Lake Brazi (TDB-1; 45?23'47"N, 22-54'06"E, 1740 m a.s.l.), a small, glacial lake in the Retezat (South Carpathian Mountains, Romania) provides a sensitive record of the impacts of late glacial climatic change on siliceous algal assemblages. The sequence, ranging from 15,700 cal yr BP to 9500 cal yr BP, suggests that the most significant changes in diatom assemblages took place at 12,800 and 10,400 cal yr BP, when alkaliphilous fragilarioid taxa were replaced by acidophilous diatoms. Altogether eight zones were distinguished with sharp and rapid changes of diatom assemblages. The paper discusses the application of siliceous algae in multi-proxy paleolimnological analyses, demonstrates the advantages and disadvantages of this proxy and presents the story of floristic discovery of unique diatom assemblages, the closest recent analogs of which are found in the arctic region.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban diatoms glacial lakes
Megjelenés:	Central European Geology. - 52 : 3-4 (2009), p. 249-268. -
További szerzők:	Magyari Enikő (1973-) (biológus) Soróczki-Pintér Éva Hubay Katalin (1985-) (biológus, környezetkutató) Braun Mihály (1966-) (vegyész, analitikus) Bálint Miklós
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001-es BibID:	BIBFORM081459
Első szerző:	Csámer Árpád (geológus)
Cím:	Interaction between a Late Miocene andesitic dyke swarm and wet sediment in the Szoros Valley, Eastern Borsod Basin, Northeast Hungary / Árpád Csámer
Dátum:	2015
ISSN:	1788-2281 1789-3348
Megjegyzések:	Magma/wet sediment interaction (e.g. autobrecciation, magma-sediment mingling, hyaloclastite and peperite-forming, etc.) is a common phenomenon, where hot magma intrudes into unconsolidated or poorly consolidated water saturated sediment. In the Eastern Borsod Basin (NE-Hungary) relatively small (2-30 m) subvolcanic bodies, sills and dykes with contact lithofacies zones were found generated by mechanical stress and quenching of the magma, and interacting with unconsolidated wet andesitic lapilli-tuff and tuff-breccia. Close to the contact between sediment and intrusions, thermal and mechanical effects may occur in the host sediment. Hydrothermal alteration and stratification of the host sediment were developed only locally along the contact zone, probably due to the paleo-hydrogeologic and paleo-rheological inhomogeneities of the lapilli-tuff-tuff-breccia deposits. Processes of magma/wet sediment interaction may be difficult to recognize because of limited exposure and/or certain similarities of the brecciated intrusions to the characteristics of the host sediment; hence detailed field work (geologic mapping or profiling) was required to demonstrate the subvolcanic origin of the brecciated andesite bodies.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk andesite dyke magma/wet sediment interaction contact lithofacies peperite
Megjelenés:	Central European Geology. - 58 : 3 (2015), p. 246-267. -
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001-es BibID:	BIBFORM081462
Első szerző:	Gucsik Arnold
Cím:	Non-luminescent nature of the planar deformation features in shocked quartz from the Ries impact structure, Germany : a new interpretation / Arnold Gucsik, Tasuku Okumura, Hirotsugu Nishido, Ildikó Gyollai, Kiyotaka Ninagawa, Natalie Deseta, Péter Rózsa
Dátum:	2015
ISSN:	1788-2281 1789-3348
Megjegyzések:	Quartz grains from the Ries impact structure containing shock-induced microstructures were investigated using Scanning Electron Microscopy in cathodoluminescence (SEM-CL), secondary electron (SEM-SE) and back-scattered electron (SEM-BSE) modes as well as Mott?Seitz analysis. The purpose of this study is to evaluate the mechanism by which CL detects Planar Deformation Features (PDFs) in quartz, which is one of the most important indicators of shock metamorphism in rock-forming minerals. PDFs are micron-scale features not easily identified using optical microscopy or scanning electron microscopy. The CL spectrum of PDFs in quartz that has suffered relatively high shock pressure shows no or a relatively weak emission band at around 385 nm, whereas an emission band with a maximum near 650 nm is observed independent of shock pressure. Thus, the ~385 nm intensity in shocked quartz demonstrates a tendency to decrease with increasing shock metamorphic stage, whereas the 650 nm band remains fairly constant. The result indicates that the emission band at 385 nm is related to the deformed structure of quartz as PDFs.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk planar deformation features cathodoluminescence shock waves quartz meteorite crater
Megjelenés:	Central European Geology. - 58 : 3 (2015), p. 217-229. -
További szerzők:	Okumura, Tasuku Nishido, Hirotsugu Gyollai Ildikó Ninagawa, Kiyotaka Deseta, Natalie Rózsa Péter (1956-) (petrográfus)
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001-es BibID:	BIBFORM079444
Első szerző:	Magyari Enikő (biológus)
Cím:	Radiocarbon chronology of glacial lake sediments in the Retezat Mts (South Carpathians, Romania): a window to Late Glacial and Holocene climatic and paleoenvironmental changes / Magyari Enikő K., Braun Mihály, Buczkó Krisztina, Kern Zoltán, László Péter, Hubay Katalin, Bálint Miklós
Dátum:	2009
ISSN:	1788-2281 1789-3348
Megjegyzések:	As a first piece in a series of Late Quaternary paleoecological studies on the glacial lake sediments of the Retezat Mountains, this study discusses radiocarbon chronology and sediment accumulation rate changes in two sediment profiles in relation to lithostratigraphy, organic content, biogenic silica and major pollenstratigraphic changes. A total of 25 radiocarbon dates were obtained from sediments of two lakes, Lake Brazi (TDB-1; 1740 m a.s.l.) and Lake Gales (Gales-3; 1990 m a.s.l.). Age-depth modeling was performed on TDB-1 using calibrated age ranges from BCal and various curve-fitting methods in psimpoll. Our results suggest that sediment accumulation began between 15,124?15,755 cal yr BP in both lakes and was continuous throughout the Late Glacial and Holocene. We demonstrated that local ecosystem productivity showed delayed response to Late Glacial and Early Holocene climatic changes in the subalpine and alpine zones most likely attributable to the cooling effect of remnant glaciers and meltwater input. However, regional vegetation response was without time lag and indicated forestation and warming at 14,450 and 11,550 cal yr BP, and cooling at ca. 12,800 cal yr BP. In the Holocene one major shift was detected, starting around 6300 cal yr BP and culminating around 5200 cal yr BP. The various proxies suggested summer cooling, shorter duration of the winter ice-cover season and/or increasing size of the water body, probably in response to increasing available moisture.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk Late Glacial radiocarbon dating loss-on-ignition pollen glacial lake sediments rapid climate change
Megjelenés:	Central European Geology. - 52 : 3-4 (2009), p. 225-248. -
További szerzők:	Braun Mihály (1966-) (vegyész, analitikus) Buczkó Krisztina (1962-) (biológus) Kern Zoltán László Péter Hubay Katalin (1985-) (biológus, környezetkutató) Bálint Miklós
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