Sándor Józsa | Eötvös Loránd University (original) (raw)

Papers by Sándor Józsa

Research paper thumbnail of How We Used NASA Lunar Set in Planetary Material Science Analog Studies on Lunar Basalts and Breccias with Industrial Materials of Steels and Ceramics

Research paper thumbnail of Origin, timing and paleogeographic implications of Paleogene karst bauxites in the northern Transdanubian range, Hungary

International Journal of Earth Sciences

Paleogene karst bauxites in the northeastern Transdanubian Range and their cover sequences provid... more Paleogene karst bauxites in the northeastern Transdanubian Range and their cover sequences provide valuable sedimentary archives, despite their weathered nature and vague paleontological records. U–Pb detrital zircon geochronology combined with heavy mineral analysis indicates ‘local’ Alpine aeolian and fluvial sources and ‘distant’ aeolian sources connected to the Bohemian Massif. Records of episodic Paleogene volcanic eruptions related to igneous complexes of the Adamello and probably also the Bergell, Recsk and Balkan Peninsula, are reflected by euhedral zircon crystals. Their U–Pb geochronology supplies age constraints for the phases of subaerial exposure of the karstic surface and the accumulation of bauxitic protoliths and helps to improve the existing stratigraphic records and to define stages of denudation in the northeastern Transdanubian Range. Distinct phases of subaerial exposure and accumulation of the bauxite's protoliths are identified as ca. 42, 35 and 31 Ma; alt...

Research paper thumbnail of Traces of the Late Eocene - Early Oligocene volcanic activity in the Buda Hills (Transdanubian Range, Hungary): link to the volcanism along the Periadriatic - Mid-Hungarian - Sava-Vardar zone

Research paper thumbnail of Comparability of heavy mineral data – The first interlaboratory round robin test

Earth-Science Reviews, 2020

Research paper thumbnail of Terrestrial kaolin deposits trapped in Miocene karstic sinkholes on planation surface remnants, Transdanubian Range, Pannonian Basin (Hungary)

Geological Magazine, 2020

In the Transdanubian Range, Pannonian Basin, Hungary, karstic sinkholes on a planation surface of... more In the Transdanubian Range, Pannonian Basin, Hungary, karstic sinkholes on a planation surface of Triassic carbonates are filled by grey clayey–silty kaolin deposits. The provenance and accumulation age of these strongly altered terrestrial karst-filling sediments are constrained by X-ray powder diffraction, heavy mineral analysis and zircon U–Pb dating. The heavy minerals of the Southern Bakony Mountains samples are dominated by the ultra-stable zircon–rutile–tourmaline association. Zircon U–Pb data indicate accumulation between 20 and 16 Ma. Furthermore, Archaean to Palaeogene grains were also determined, reflecting the principally fluvial recycling of Eocene bauxites and their cover sequences. In contrast, the sample from the Keszthely Hills consists almost exclusively of airborne material including zircons of 18–14 Ma, reflecting a dominant contribution from the Carpathian–Pannonian Neogene volcanism. The shift in the Miocene age components is inferred to have been caused by the...

Research paper thumbnail of Magmatic and metamorphic evolution of tourmaline-rich rocks of the Sopron area, Eastern Alps

Journal of Geosciences, 2018

Research paper thumbnail of Permian felsic volcanic rocks in the Pannonian Basin (Hungary): new petrographic, geochemical, and geochronological results

International Journal of Earth Sciences, 2019

Two distinct Permian volcanic epochs were revealed in the Pannonian Basin (eastern Central Europe... more Two distinct Permian volcanic epochs were revealed in the Pannonian Basin (eastern Central Europe) by U–Pb zircon geochronology: an older one (~ 281 Ma, Cisuralian) in the ALCAPA Mega-unit (Central Transdanubia, Hungary) and a younger volcanic episode (~ 267–260 Ma, Guadalupian) in the Tisza Mega-unit (Southern Transdanubia and the eastern Pannonian Basin, Hungary). The former is represented by dacitic subvolcanic rocks (dykes) and lavas, while the latter is dominantly by crystal-rich rhyolitic–rhyodacitic/dacitic ignimbrites and subordinate rhyodacitic/dacitic lavas. Whole-rock (major and trace element) geochemical data and zircon U–Pb ages suggest close relationship between the samples of Central Transdanubia and volcanic rocks of the Northern Veporic Unit (Western Carpathians, Slovakia), both being part of the ALCAPA Mega-unit. Such correlation was also revealed between the Permian felsic volcanic rocks of the Apuseni Mts (Romania) and the observed samples of Southern Transdanubi...

Research paper thumbnail of Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

International Journal of Earth Sciences, 2019

Research paper thumbnail of The Budaörs-1 well revisited: Contributions to the Triassic stratigraphy, sedimentology, and magmatism of the southwestern part of the Buda Hills

Central European Geology, 2017

Research paper thumbnail of Fe-Mn oxide indications in the feeder and mound zone of the Jurassic Mn-carbonate ore deposit, Úrkút, Hungary

Ore Geology Reviews, 2017

Research paper thumbnail of Determining clast and magnetic fabric of a subaqueous lahar deposit as a tool for reconstructing paleoflow directions and emplacement processe

Research paper thumbnail of Flow directions and emplacement mode of a subaqueous ignimbrite based on twofold directional fabric analyses

Directional fabric – in the sense of preferred grain alignment – of deposits from subaerial pyroc... more Directional fabric – in the sense of preferred grain alignment – of deposits from subaerial pyroclastic density currents (PDCs) are widely reported and are related to forces are acting just before the emplacement of the load from the mass flow. In this way, flow direction, source area and emplacement mode have successfully obtained by investigating the flow-related directional fabric (e.g. Giordano, G. et al. 2008) in such cases. On the contrary, the development of fabric in subaqueously deposited volcanogenic mass flows (i.e subaqueous pyroclastic flows) is not a well-known phenomenon. The implications on flow directions and emplacement mode of a subaqueously deposited ignimbrite are presented in this study, which are based on a twofold petrofabric analyses. The directional fabric of the Rám Hill Pumiceous Sandstone were revealed. The formation is known from four outcrops around a deeply eroded Middle Miocene lava dome group in North Hungary, the so-called Keserűs Hill volcano (Kar...

Research paper thumbnail of Identification of Pyroxene-Akimotoite Phase Transformation in NWA 5011 L6 Chondrite: Confirmation of the Preliminary Optical Observations

Introduction: The transformation of pyroxene to akimotoite (ilmenite-structured MgSiO 3) was obse... more Introduction: The transformation of pyroxene to akimotoite (ilmenite-structured MgSiO 3) was observed in several previously works [1,2,3] from highly shocked chondritic meteorites. In general, the high pressure phase transformations occur just in or along the shock melt veins (SMV's) because of the activation energy by postshock-temperature. If decline rate of temperature is faster than pressure new high-pressure phases could form such as akimotoite, ringwoodite, Na-hollandite. We presented in our earlier works about the high-pressure mineralogy of NWA 5011 L6 chondrite as well as texture of shock melt veins. In this work we present the confirmation of partially transformed pyroxene to akimotoite by micro-Raman spectrometry including micro-Raman 2D and 3D mapping. Sample and Methods: For micro-Raman investigation and optical observation we have done a thin section in 35-40 µm thickness. This thickness was prepared to eliminate the micro-Raman features of epoxy glue. The optical ...

Research paper thumbnail of Planetary Science Synthesis Education Using Structural Hierarchy for Martian Materials

We continued planetary synthesis educational program which was began last year by NASA lunar set.... more We continued planetary synthesis educational program which was began last year by NASA lunar set. This year we arranged some impor-tant martian events into a structural hierarchy multi-level system and frame. Although the evolutionary steps are distinctly separated, this way martian plane-tary evolution can be demonstrated with various measurements: stratigraphy (USGS maps), imaging of surface layers (Viking, MGS, MEX, MRO images), hand specimen meteorite samples, rover surface ob-servations and thin sections (NASA and NIPR collec-tions). (Table. 1.)

Research paper thumbnail of How We Used the Antarctic Meteorite Thin Section Set of NIPR to a Synthesis of the Thermal Evolution of a Chondritic Body

We interpreted an evolutionary synthesis of regions (belts) in the chondritic parent body by arra... more We interpreted an evolutionary synthesis of regions (belts) in the chondritic parent body by arranging the NIPR set members according to 1) chondritic thermal metamorphism and 2) the differentiated crust, mantle and core regions.

Research paper thumbnail of Mien-Ramsö Island Impact Melt Rock and Breccia: Origin of Vesicular Sharp Pebbles from the Ramsö Island

The vesicular, 'rhyolitic', glacial eolic erosion shaped 'sharp pebbles' from the... more The vesicular, 'rhyolitic', glacial eolic erosion shaped 'sharp pebbles' from the W. shoreline of Ramsö Island, the central peak of Mien Crater Lake, Sweden, has impact melted texture, but some fragments preserved parts of the original granitic texture.

Research paper thumbnail of The Relation of The South-Eastern Börzsöny Hills to the Visegrad Gorge, Hungary

Studia Geomorphologica Carpatho-Balcanica, 2013

Research paper thumbnail of Planetary Analog Field Trips at Hungarian Sites with University Space Probe Models Hunveyor and Husar

Meteoritics & planetary science

Hungarian localities were visited where planetary (mainly Mars) analog studies were carried out b... more Hungarian localities were visited where planetary (mainly Mars) analog studies were carried out by the educational lander Hunveyor and rover Husar at North-Balaton, Mecsek, Nógrád Mountains where igneous rocks (basalt, lherzolite, phonolite) are exposed, river transported rock assemblages were delivered to a plain by floods, on Earth (Dunavarsány) and on Mars (Chryse-plains).

Research paper thumbnail of How We Used NASA Lunar Set in Planetary and Material Science Studies: Textural and Cooling Sequences in Sections of Lava Column from a Thin and a Thick Lava-Flow, from the Moon and Mars with Terrestrial Analogue and Chondrule Textural Comparisons

We studied cooling textures of basalts of NASA lunar, chondrules of NIPR Antarctic meteorite sets... more We studied cooling textures of basalts of NASA lunar, chondrules of NIPR Antarctic meteorite sets and reconstructed textures of a thick lava column of a mafic lava flow on planetary surface; terrestrial counterparts were also involved in comparisons.

Research paper thumbnail of Unusual Guidebook to Terrestrial Field Work Studies: Microenvironmental Studies by Landers on Planetary Surfaces (New Atlas in the Series of the Solar System Notebooks on Eötvös University, Hungary)

Our new atlas is an unusual guidebook to terrestrial field work study in geology showing the corr... more Our new atlas is an unusual guidebook to terrestrial field work study in geology showing the corresponding activities, experiments made by planetary landers on Moon, Mars and Venus; so changing thinking from planets to Earth during the field work.

Research paper thumbnail of How We Used NASA Lunar Set in Planetary Material Science Analog Studies on Lunar Basalts and Breccias with Industrial Materials of Steels and Ceramics

Research paper thumbnail of Origin, timing and paleogeographic implications of Paleogene karst bauxites in the northern Transdanubian range, Hungary

International Journal of Earth Sciences

Paleogene karst bauxites in the northeastern Transdanubian Range and their cover sequences provid... more Paleogene karst bauxites in the northeastern Transdanubian Range and their cover sequences provide valuable sedimentary archives, despite their weathered nature and vague paleontological records. U–Pb detrital zircon geochronology combined with heavy mineral analysis indicates ‘local’ Alpine aeolian and fluvial sources and ‘distant’ aeolian sources connected to the Bohemian Massif. Records of episodic Paleogene volcanic eruptions related to igneous complexes of the Adamello and probably also the Bergell, Recsk and Balkan Peninsula, are reflected by euhedral zircon crystals. Their U–Pb geochronology supplies age constraints for the phases of subaerial exposure of the karstic surface and the accumulation of bauxitic protoliths and helps to improve the existing stratigraphic records and to define stages of denudation in the northeastern Transdanubian Range. Distinct phases of subaerial exposure and accumulation of the bauxite's protoliths are identified as ca. 42, 35 and 31 Ma; alt...

Research paper thumbnail of Traces of the Late Eocene - Early Oligocene volcanic activity in the Buda Hills (Transdanubian Range, Hungary): link to the volcanism along the Periadriatic - Mid-Hungarian - Sava-Vardar zone

Research paper thumbnail of Comparability of heavy mineral data – The first interlaboratory round robin test

Earth-Science Reviews, 2020

Research paper thumbnail of Terrestrial kaolin deposits trapped in Miocene karstic sinkholes on planation surface remnants, Transdanubian Range, Pannonian Basin (Hungary)

Geological Magazine, 2020

In the Transdanubian Range, Pannonian Basin, Hungary, karstic sinkholes on a planation surface of... more In the Transdanubian Range, Pannonian Basin, Hungary, karstic sinkholes on a planation surface of Triassic carbonates are filled by grey clayey–silty kaolin deposits. The provenance and accumulation age of these strongly altered terrestrial karst-filling sediments are constrained by X-ray powder diffraction, heavy mineral analysis and zircon U–Pb dating. The heavy minerals of the Southern Bakony Mountains samples are dominated by the ultra-stable zircon–rutile–tourmaline association. Zircon U–Pb data indicate accumulation between 20 and 16 Ma. Furthermore, Archaean to Palaeogene grains were also determined, reflecting the principally fluvial recycling of Eocene bauxites and their cover sequences. In contrast, the sample from the Keszthely Hills consists almost exclusively of airborne material including zircons of 18–14 Ma, reflecting a dominant contribution from the Carpathian–Pannonian Neogene volcanism. The shift in the Miocene age components is inferred to have been caused by the...

Research paper thumbnail of Magmatic and metamorphic evolution of tourmaline-rich rocks of the Sopron area, Eastern Alps

Journal of Geosciences, 2018

Research paper thumbnail of Permian felsic volcanic rocks in the Pannonian Basin (Hungary): new petrographic, geochemical, and geochronological results

International Journal of Earth Sciences, 2019

Two distinct Permian volcanic epochs were revealed in the Pannonian Basin (eastern Central Europe... more Two distinct Permian volcanic epochs were revealed in the Pannonian Basin (eastern Central Europe) by U–Pb zircon geochronology: an older one (~ 281 Ma, Cisuralian) in the ALCAPA Mega-unit (Central Transdanubia, Hungary) and a younger volcanic episode (~ 267–260 Ma, Guadalupian) in the Tisza Mega-unit (Southern Transdanubia and the eastern Pannonian Basin, Hungary). The former is represented by dacitic subvolcanic rocks (dykes) and lavas, while the latter is dominantly by crystal-rich rhyolitic–rhyodacitic/dacitic ignimbrites and subordinate rhyodacitic/dacitic lavas. Whole-rock (major and trace element) geochemical data and zircon U–Pb ages suggest close relationship between the samples of Central Transdanubia and volcanic rocks of the Northern Veporic Unit (Western Carpathians, Slovakia), both being part of the ALCAPA Mega-unit. Such correlation was also revealed between the Permian felsic volcanic rocks of the Apuseni Mts (Romania) and the observed samples of Southern Transdanubi...

Research paper thumbnail of Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

International Journal of Earth Sciences, 2019

Research paper thumbnail of The Budaörs-1 well revisited: Contributions to the Triassic stratigraphy, sedimentology, and magmatism of the southwestern part of the Buda Hills

Central European Geology, 2017

Research paper thumbnail of Fe-Mn oxide indications in the feeder and mound zone of the Jurassic Mn-carbonate ore deposit, Úrkút, Hungary

Ore Geology Reviews, 2017

Research paper thumbnail of Determining clast and magnetic fabric of a subaqueous lahar deposit as a tool for reconstructing paleoflow directions and emplacement processe

Research paper thumbnail of Flow directions and emplacement mode of a subaqueous ignimbrite based on twofold directional fabric analyses

Directional fabric – in the sense of preferred grain alignment – of deposits from subaerial pyroc... more Directional fabric – in the sense of preferred grain alignment – of deposits from subaerial pyroclastic density currents (PDCs) are widely reported and are related to forces are acting just before the emplacement of the load from the mass flow. In this way, flow direction, source area and emplacement mode have successfully obtained by investigating the flow-related directional fabric (e.g. Giordano, G. et al. 2008) in such cases. On the contrary, the development of fabric in subaqueously deposited volcanogenic mass flows (i.e subaqueous pyroclastic flows) is not a well-known phenomenon. The implications on flow directions and emplacement mode of a subaqueously deposited ignimbrite are presented in this study, which are based on a twofold petrofabric analyses. The directional fabric of the Rám Hill Pumiceous Sandstone were revealed. The formation is known from four outcrops around a deeply eroded Middle Miocene lava dome group in North Hungary, the so-called Keserűs Hill volcano (Kar...

Research paper thumbnail of Identification of Pyroxene-Akimotoite Phase Transformation in NWA 5011 L6 Chondrite: Confirmation of the Preliminary Optical Observations

Introduction: The transformation of pyroxene to akimotoite (ilmenite-structured MgSiO 3) was obse... more Introduction: The transformation of pyroxene to akimotoite (ilmenite-structured MgSiO 3) was observed in several previously works [1,2,3] from highly shocked chondritic meteorites. In general, the high pressure phase transformations occur just in or along the shock melt veins (SMV's) because of the activation energy by postshock-temperature. If decline rate of temperature is faster than pressure new high-pressure phases could form such as akimotoite, ringwoodite, Na-hollandite. We presented in our earlier works about the high-pressure mineralogy of NWA 5011 L6 chondrite as well as texture of shock melt veins. In this work we present the confirmation of partially transformed pyroxene to akimotoite by micro-Raman spectrometry including micro-Raman 2D and 3D mapping. Sample and Methods: For micro-Raman investigation and optical observation we have done a thin section in 35-40 µm thickness. This thickness was prepared to eliminate the micro-Raman features of epoxy glue. The optical ...

Research paper thumbnail of Planetary Science Synthesis Education Using Structural Hierarchy for Martian Materials

We continued planetary synthesis educational program which was began last year by NASA lunar set.... more We continued planetary synthesis educational program which was began last year by NASA lunar set. This year we arranged some impor-tant martian events into a structural hierarchy multi-level system and frame. Although the evolutionary steps are distinctly separated, this way martian plane-tary evolution can be demonstrated with various measurements: stratigraphy (USGS maps), imaging of surface layers (Viking, MGS, MEX, MRO images), hand specimen meteorite samples, rover surface ob-servations and thin sections (NASA and NIPR collec-tions). (Table. 1.)

Research paper thumbnail of How We Used the Antarctic Meteorite Thin Section Set of NIPR to a Synthesis of the Thermal Evolution of a Chondritic Body

We interpreted an evolutionary synthesis of regions (belts) in the chondritic parent body by arra... more We interpreted an evolutionary synthesis of regions (belts) in the chondritic parent body by arranging the NIPR set members according to 1) chondritic thermal metamorphism and 2) the differentiated crust, mantle and core regions.

Research paper thumbnail of Mien-Ramsö Island Impact Melt Rock and Breccia: Origin of Vesicular Sharp Pebbles from the Ramsö Island

The vesicular, 'rhyolitic', glacial eolic erosion shaped 'sharp pebbles' from the... more The vesicular, 'rhyolitic', glacial eolic erosion shaped 'sharp pebbles' from the W. shoreline of Ramsö Island, the central peak of Mien Crater Lake, Sweden, has impact melted texture, but some fragments preserved parts of the original granitic texture.

Research paper thumbnail of The Relation of The South-Eastern Börzsöny Hills to the Visegrad Gorge, Hungary

Studia Geomorphologica Carpatho-Balcanica, 2013

Research paper thumbnail of Planetary Analog Field Trips at Hungarian Sites with University Space Probe Models Hunveyor and Husar

Meteoritics & planetary science

Hungarian localities were visited where planetary (mainly Mars) analog studies were carried out b... more Hungarian localities were visited where planetary (mainly Mars) analog studies were carried out by the educational lander Hunveyor and rover Husar at North-Balaton, Mecsek, Nógrád Mountains where igneous rocks (basalt, lherzolite, phonolite) are exposed, river transported rock assemblages were delivered to a plain by floods, on Earth (Dunavarsány) and on Mars (Chryse-plains).

Research paper thumbnail of How We Used NASA Lunar Set in Planetary and Material Science Studies: Textural and Cooling Sequences in Sections of Lava Column from a Thin and a Thick Lava-Flow, from the Moon and Mars with Terrestrial Analogue and Chondrule Textural Comparisons

We studied cooling textures of basalts of NASA lunar, chondrules of NIPR Antarctic meteorite sets... more We studied cooling textures of basalts of NASA lunar, chondrules of NIPR Antarctic meteorite sets and reconstructed textures of a thick lava column of a mafic lava flow on planetary surface; terrestrial counterparts were also involved in comparisons.

Research paper thumbnail of Unusual Guidebook to Terrestrial Field Work Studies: Microenvironmental Studies by Landers on Planetary Surfaces (New Atlas in the Series of the Solar System Notebooks on Eötvös University, Hungary)

Our new atlas is an unusual guidebook to terrestrial field work study in geology showing the corr... more Our new atlas is an unusual guidebook to terrestrial field work study in geology showing the corresponding activities, experiments made by planetary landers on Moon, Mars and Venus; so changing thinking from planets to Earth during the field work.