Balázs Bradák

Balázs Bradák
Faculty of Oceanology Kobe University

PhD

About

74
Publications
9,817
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572
Citations
Citations since 2016
48 Research Items
415 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Additional affiliations
April 2019 - March 2021
Universidad de Burgos
Position
  • PostDoc Position

Publications

Publications (74)
Poster
Full-text available
More and more attention has been raising toward the icy moons of the Solar System since the discovery of their potential liquid water [1], and the astrobiology potential below their surface ice [2]. In addition, the ongoing preparation of JUICE (JUpiter ICy moons Explorer) mission is boosting the research as well. Before the hopefully successful JU...
Poster
Full-text available
In 2010, Rampelotto suggested [1] that Panspermia hypothesis, the transfer of the “seeds of life” between planets [2] is one of the promising fields of astrobiological and planetary research. The suggested transfer has some crucial steps, generally marked as i) escape, ii) transfer and iii) and landing phases [2]. All steps have been investigated,...
Conference Paper
Full-text available
Ground Penetrating Radar Investigation of Seismic cracks in agriculture terrace
Article
Full-text available
Geomagnetic excursions represent the dynamic nature of the geodynamo. Accumulated palaeomagnetic records indicate that such excursions are dominated by dipolar-fields, but exhibit different structures. Here we report a palaeomagnetic record from the varved sediments of Lake Suigetsu, central Japan, which reveals fine structures in the Laschamp Excu...
Article
Full-text available
The timing and intensity of deformation of the Tanggula Range and Tuotuohe Basin are in debatable but strengthening the research on them is necessary for better understanding the geodynamic models of the Tibet and the tectonic-climate connections during the Cenozoic. Here we present the anisotropy of magnetic susceptibility (AMS) records from the f...
Conference Paper
Full-text available
More and more attention has been raising toward the icy moons of the Solar System since the discovery of their potential liquid water, and the astrobiology potential below their surface ice. In addition, the ongoing preparation of JUICE (JUpiter ICy moons Explorer) mission from ESA is boosting the research as well. One of the many research topics,...
Article
Full-text available
Internal temperature variations of pyroclastic flows and their deposits are arguably the most challenging data to acquire. As a preliminary study of the temperature variation inside pyroclastic flows, the remains of Onokoba Elementary School (Shimabara, Japan) were investigated. The elementary school is located in the close vicinity of Unzen volcan...
Presentation
Full-text available
Introduction and proposal of the concept of forensic geohazard profiling. Invited speech at The International Conference of Geography and Disaster Management (ICGDM) 2021.
Article
Full-text available
In the aftermath of pyroclastic density current-dominated eruptions, lahars are the main geomorphic agent, but at the decadal scale, different sets of processes take place in the volcanic sediment cascade. At Unzen volcano, in the Gokurakudani gully, we investigated the geomorphologic evolution and how the topographic change and the sediment change...
Article
Poor understanding of the differential evolution of interglacial climate over various regions in Eurasia greatly limits our ability to predict the specific local impacts of future climate change. Here we demonstrate starkly opposing trends in interglacial intensities in Asia and Europe over the early Middle Pleistocene and Mid-Brunhes Transitions b...
Preprint
In the aftermath of pyroclastic-flow –dominated eruptions, lahars are the main geomorphic agent, but at the decadal scale, different sets of processes take place in the volcanic sediment cascade. At Unzen Volcano, in the Gokurakudani Gully we investigated the geomorphologic evolution and how the topographic change and the sediment change over time...
Presentation
Full-text available
Toward the understanding of (post)pedogenic processes behind the peaks and lows of commonly used climate proxies Horváth, E1, Bradák, B2, Szeberényi, J3, Csonka, D1, Végh, T1, Novothny, Á1 1Department of Physical Geography, Institute of Geography and Earth Sciences, Eötvös Loránd University, Pázmány Péter st. 1/C, Budapest, H‐1117, Hungary, erzse...
Article
Full-text available
Magnetic fabric (MF) investigations complemented by geochemical and grain surface analyses of the understudied and controversial marine isotope stage (MIS) 5 b, 4 and 3 loess deposits in the Lower Volga region, Russia show that the material has been transported and deposited by wind and to a large extent experienced post-depositional reworking. Gra...
Presentation
Full-text available
Highlights: 1) Environmental magnetic study of loess: state, developments and concerns; 2) Introduction of pedogenic magnetic enhancement models in loess: local, regional and global perspectives; 3) Magnetic proxies from loess: “comfortable dead-end” or triggers of a progressive change? 4) A personal point: a paradigm change may be needed to evalu...
Article
Magnetic susceptibility measurements play a key role in Quaternary studies. Magnetic proxies, such as low field and frequency-dependent magnetic susceptibility, are widely applied in the reconstruction of terrestrial paleoclimate, e.g., in the study of loess-paleosol successions. In general, the interpretation of loess magnetic susceptibility signa...
Article
Full-text available
The geomorphological characteristics of the loess succession at Malá nad Hronom (Slovakia) mean that it provides a valuable opportunity for the investigation of differences in soil formation in various topographic positions. Along with the semiquantitative characterization of the paleosols (on the basis of physical properties, texture, the characte...
Article
Full-text available
Loess deposits in southern Britain contain a record of dust, climate and landscape dynamics over the last glacial, yet their age and accumulation rate remain poorly known. Furthermore, the environmental controls on the loess-soil stratigraphy shown in the thickest deposits in southeast England are still debated. Here we apply the first high samplin...
Article
The Galería Complex is a cave sediment succession at the Atapuerca paleoanthropological site (Burgos, Spain) that offers detailed environmental information about the late Middle Pleistocene, especially the period between marine oxygen isotope stages MIS10 and MIS7. Previous studies have reconstructed the chronology and detailed the environmental de...
Article
Full-text available
Abstract Terrestrial records of the last geomagnetic reversal often have few age constraints. Chronostratigraphy using suborbital-scale paleoceanic events during marine isotope stage 19 may contribute to solving this problem. We applied the method to an 8 m long, high-resolution paleomagnetic record from a loess sequence in China and revealed mille...
Poster
Full-text available
This study summarises the potential of rock and enviromagnetic methods, which can help to identify weathered horizons and pedogenic processes in future planetary missions, focusing on methods used on-board future rovers. Certain terrestrial soils have been already used as potential analogues to Mars on soil-like weathering produced surface layer. P...
Article
An archaeomagnetic, rock magnetic and magnetic fabric study has been carried out on seven anthropogenic ash horizons in the Middle Paleolithic sedimentary level XXIV at the rock shelter of Crvena Stijena ('Red Rock'), Montenegro. The study has multiple goals, including the identification of iron bearing minerals formed during combustion, assessment...
Preprint
Full-text available
An archaeomagnetic, rock magnetic and magnetic fabric study has been carried out on seven anthropogenic ash horizons in the Middle Paleolithic sedimentary level XXIV at the rock shelter of Crvena Stijena ('Red Rock'), Montenegro. The study has multiple goals, including the identification of iron bearing minerals formed during combustion, assessment...
Article
Full-text available
The late Quaternary development of the Lower Volga region of Russia is characterized by an alternating influence of marine and continental environments resulting from fluctuations in Caspian Sea level during the last glaciation. However, sediments deposited under continental conditions have received very little research attention compared to the un...
Article
A summary of approximately three decades and greater than thirty loess magnetic fabric studies is presented here. The revised studies cover various loess regions from the Chinese Loess Plateau across the European Loess Belt to Alaska. Although there is still an ongoing argument about the feasibility of the magnetic fabric of loess in paleowind rec...
Article
An archaeomagnetic, rock magnetic and magnetic fabric study has been carried out on seven anthropogenic ash horizons in the Middle Paleolithic sedimentary level XXIV at the rock shelter of Crvena Stijena (‘Red Rock’), Montenegro. The study has multiple goals, including the identification of iron bearing minerals formed during combustion, assessment...
Article
Central Asia loess deposits can yield detailed records of aridification across the Asian interior, as well as the atmospheric circulation. In this study, we presented grain size, heavy mineral assemblage, rock magnetism and anisotropy of magnetic susceptibility of a loess section in the Tacheng Basin in Xinjiang region, NW China. The results of ani...
Poster
Full-text available
The research focuses on the paradox between the low shock stage of carbonaceous chondrites and the marks of hypervelocity impacts, indicated by magnetic parameters which shows the mark of significant alteration triggered by impact induced shock. Solving the paradox above a theory about the role of multiple impact produced structures instead of one...
Article
Full-text available
A Middle Miocene, ~8 m thick pyroclastic succession, reported from the Bükk Foreland Volcanic Area (BFVA) in Northern Hungary (Central Europe) specified here as the Jató Member, was produced by silicic phreatomagmatism (Phreatoplinian sensu lato). Two well-preserved outcrops ~8 km apart and inferred to be within ~10–50 km from source represent the...
Article
Full-text available
Magnetic enhancement of Chinese loess‐paleosol sequences has been used extensively as a proxy for East Asian summer monsoon variations. However, the pedogenic magnetic particles contributing to this magnetic enhancement are difficult to extract, so it is not clear how they formed. In this study, we reveal pedogenic magnetite and hematite using elec...
Presentation
Full-text available
Part of a two-days invited lecture, held at Kobe University. General overview about forensic Earth science.
Article
The stratotype section of Paks brickyard provides the most detailed accessible loess-paleosol sequence from almost the entire Pleistocene in the middle part of the Carpathian Basin. The best and thickest loess archives of Hungary (Paks, Udvari-2A borehole) are preserved in this part of the basin and now two more drilling cores were deepened in this...
Article
Diffuse reflectance spectroscopy (DRS) parameters, such as the redness index and hematite/goethite ratios are popular in the study of loess-paleosol sequences. The suggested parameters, however, have their limitations: only some parts of the whole reflectance spectrum are being used, and the spectra of some important components may be excluded from...
Article
Three well-developed paleosols from the Paks loess succession (Hungary), a key profile of the European Loess Belt, were sampled and studied by rock magnetic methods, such as low-field magnetic susceptibility and hysteresis measurements. The studied paleosols formed in MIS19, MIS15 and MIS11 and represent key periods in the Middle Pleistocene, namel...
Poster
Full-text available
Although there are many doubts about the application of magnetic fabric methods in the determination of paleowind direction, magnetic fabric studies have been applied on loess since the early studies in the 1980th. In the ideal (?) magnetic fabric (MF) of aeolian loess, formed of elongated magnetic minerals, the orientation of the long axis is det...
Article
On the basis of a key model of the appearance of hematite and goethite in some Chinese and European loess successions, paleosols generally contain higher proportions of hematite formed by pedogenic processes during warm and humid interglacials, while loess contains sedimentary goethite deposited during colder, glacial periods. Rock magnetic measure...
Article
A multi-proxy analysis, including grain size, magnetic susceptibility and the examination of stable isotopes of hypocoatings, was performed on the loess-paleosol succession at Hévízgyörk (Hungary). Field investigations suggested a continuous record of sedimentation and pedogenesis. However, after the identification of the Bag Tephra, it revealed th...
Article
Anisotropy of magnetic susceptibility (AMS) measurements, a commonly used method, has been applied in loess to determine the dominant palaeowind direction during the Pleistocene. During the last session of sampling and detailed magnetic investigation of the Early Middle Pleistocene loess/palaeosol succession at Paks (Hungary), ‘irregular’ (i.e. non...
Article
Quantitative paleotemperature reconstructions for the continents, including East Central Europe, over marine isotope stage 5 (MIS 5) and specifically the last interglacial (LIG, MIS 5e) are scarce and mostly based on pollen assemblages. Here we provide soil and air temperature reconstructions for the summer season of MIS 5e (5c) using carbonate clu...
Article
The effects of pedogenic magnetic grains on the magnetic fabric of paleosols were investigated using samples from the Paks loess profile, Hungary. Rock magnetic experiments, electron probe microanalysis, and scanning electron microscopy revealed characteristic signatures of (post-)pedogenic influences on the original sedimentary fabric. No differen...
Article
The stable carbon and oxygen isotope composition of three different local variations of the same MIS5e paleosol horizon were studied in the Verőce loess-paleosol sequence (Hungary). These variations developed in local top, paleoslope and paleovalley topographic positions with characteristic secondary carbonate features, such as hypocoatings (HCs)....
Poster
Full-text available
A multi-proxy analysis was performed on the loess-paleosol succession in Hévízgyörk (Hungary), which included grain size analysis, magnetic susceptibility, diffuse reflectance, micromorphology and the examination of stable isotopes from hypocoatings. Field investigations showed a continuous record of sedimentation and pedogenesis over the course of...
Article
We describe magnetic fabric and depositional environments of aeolian (loess) deposits from Paks, Hungary, and develop a novel, complex conceptual sedimentation model based on grain size and low-field magnetic susceptibility anisotropy data. A plot of shape factor (magnetic fabric parameter) and dry deposition velocity estimated from grain-size reve...
Article
Full-text available
Suborbital-scale climate variations, possibly caused by solar activity, are observed in the Holocene and last-glacial climates. Recently published bicentennial-resolution paleoceanic environmental records reveal millennial-scale high-amplitude oscillations postdating the last geomagnetic reversal in the Marine Isotope Stage (MIS) 19 interglacial. T...
Article
Low field anisotropy of magnetic susceptibility (AMS) and rock magnetic measurements were applied to sediments deposited by the 2011 Tohoku-oki tsunami to reveal the dynamic of the tsunami run-up and the character of the sedimentation along the Misawa coast, Aomori Prefecture, northern Japan. In the tsunami deposits studied, elongated, coarse-grai...
Article
Full-text available
Great advances are expected during the analysis of drilled material acquired from 2 m depth by ExoMars rover, supported by the comparison to local context, and the joint use of different instruments. Textural information might be less detailed relatively to what is usually obtained at outcrops during classical geological field work on the Earth, pa...
Article
Anisotropy of magnetic susceptibility (AMS) is a frequently applied method in sedimentology, especially in the determination of the orientation of transport processes. We present an analysis of magnetic fabric (MF) studies on loess. New aspects of fabric development reveal: i) The deposition of the aeolian sediments was controlled by gravity, low-e...
Poster
Full-text available
In references: “The behaviour of loess magnetic fabric during (de)magnetization experiments”, Balazs Bradak, Masayuki Hyodo and Yusuke Seto, ‘Paleomagnetic summer school’, Center for Advanced Marine Core Research, Kochi University, Japan (30th August/ 2nd September, 2016).
Article
A twofold fabric analysis by using photo-statistics on rock surfaces and low-field anisotropy of magnetic susceptibility (AMS) is presented, making it possible to infer paleoflow directions, which in turn helps to constrain the primary volcanic geomorphology of a deeply eroded mid-Miocene field (Keserűs Hill lava dome group, Visegrád Mountains, Nor...
Conference Paper
Full-text available
The aim of this study is to present the results of the stratigraphical, sedimentological and geochemical analyses (XRD, XRF, total carbon content, diffuse reflectance and differential thermal analysis) of some sediment sections of Béke Cave (Aggtelek Karst, Hungary). The cave was formed within Triassic limestone that is covered by Miocene, Pliocene...
Conference Paper
Full-text available
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...
Article
We outline how the data from the drilled samples by the ExoMars rover will provide information on the source, tranport, and paleoenvironment of the particles.
Article
Statistical analytical methods were applied to classify the magnetic fabric of samples from different Hungarian loess profiles. A previous study of the anisotropy of magnetic susceptibility (AMS) of Hungarian loess suggested that ‘typical’ (wind-blown or undisturbed) and ‘redeposited’ loess were well differentiated by known statistical methods. The...
Article
Full-text available
The over 150 years of Hungarian loess research can be divided into three main phases. (1) The first phase is the early times of the Hungarian loess research from the 1850s until the beginning of the 20th century. This was the time of recognition, definition of loess, and the birth of the first ideas about the origin of loess, following the internat...
Article
Complex geomorphological, geological, paleopedological and chronometrical investigations were started to reveal the development of the alluvial section and the loess/paleosol sequence containing remnants of a Late Palaeolithic site near Verőce, Hungary. Different paleoenvironments were identified in the profiles of the abandoned brickyard influence...
Chapter
The purpose of this paper is to provide a preliminary report on the analyses of the polished and ground stone assemblage from the site of Hódmezővásárhely-Gorzsa, a Tisza Culture tell site which lies at the confluence of the Tisza and Maros rivers in the Great Hungarian Plan (Fig. 1). During the excavations, 1,000 m2 of the tell settlement were inv...
Chapter
The petrological processing of archaeological polished stone artefacts from the Carpathian Basin has started to develop only in the last decades. This work benefited much from the systematic elaboration of historical collections from the nineteenth century. One of the most significant collections of this type was donated to the Hungarian National M...
Article
A climate cycle model was calculated using different methods (e.g., paleomagnetic, sedimentological and heavy mineral studies) on the loess sequence containing four paleosol and five loess layers in Cérna Valley. The model is based on the development of the sediment sequence created by the influence of the climatic, geological and geomorphological...
Conference Paper
Full-text available
The Šarengrad loess section is located on the south bank of the Danube River in the easternmost part of Croatia. The published lithostratigraphical results including grain size, total organic content, calcium carbonate content and luminescence dating results was complemented by geochemical (content of major elements and trace elements and acidity a...
Conference Paper
Full-text available
The Šarengrad loess section is located on the south bank of the Danube River in the easternmost part of Croatia. The published lithostratigraphical results including grain size, total organic content, calcium carbonate content and luminescence dating results (Galović et al., 2009 ; submitted) were complemented by geochemical (content of major eleme...
Article
Full-text available
AMS studies earlier carried out on the flysch sediments from the Outer Western Carpathians focused on the sandstone members deposited from turbidity currents. The main conclusion of these studies was that the dominant features of the AMS fabric developed during sedimentation and the tectonic overprint was weak. In recent years a large number of cla...
Article
A non-destructive method – magnetic susceptibility (MS, κ) measurement – was used to characterize about 360 Neolithic, Copper and Bronze age polished stone tools of the Miháldy collection (Laczkó Dezső Museum, Veszprém, Hungary), composed of artefacts from three Neolithic (Moravian Painted Ware) workshops around a source of greenschist at Želešice...
Conference Paper
The Pleistocene loess and Holocene alluvial sediments are dominant lithological members of Eastern Slavonia. The Upper Pleistocene loess/palaeosol section “Šarengrad”, representing the oldest loess deposits in the region, was investigated using field and laboratory research methods.. Investigated section is located on the south bank of the Danube R...
Article
This study provides the first application of anisotropy of magnetic susceptibility (AMS) measurements for the study of Pleistocene-wind directions and the environment during the deposition of dust and lithifaction of loess in the Carpathian Basin. A total of 67 samples were taken from seven loess–paleosol outcrops to test this method on loess–paleo...
Article
The loess–paleosol sequences in Hungary provide an excellent Upper Pleistocene climate archive of the Carpathian Basin. Loess deposits up to 20m thick cover the Süttő travertine complex, located in the very northern part of Hungary, next to the right bank of the Danube River. The loess is intercalated with two weakly developed greyish horizons, two...