Department of Neotectonics and Thermochronology

Department of Neotectonics and Thermochronology deals with characterizing of fault structures and tectonic activity, as well as with study of geodynamic evolution of studied areas. Multidisciplinary approach uses methods of tectonic geomorphology, structural geology, applied geophysics etc. Spatiotemporal reconstruction and modelling of geological processes related to natural hazards such as tectonic movements and volcanism use also radionuclide dating methods, such as for example thermochronological dating.

1. Neotectonics and paleoseismicity 
Within the topics we study how tectonic movements formed the relief and with which slip rate of the faulting during late Tertiary and Quaternary. We also want to learn if the movements have been accompanied by larger earthquakes by studying their geological record on the surface or subsurface, in the Bohemian massif as well as abroad. We try to find out how large and how often those earthquakes happened in order to assess the seismic hazard in the sutided regions. Also paleostress changes during tectonic phases are a subject of our research.

2. Seismic hazard assessment 
Seismic hazard assessment has been done for seismoactive areas (e.g. Kashmir Valley in Western Himalaya), where also site response analysis was done using geotechnical earthquake engineering approach. Seismic microzonation of highly populated area has been also a result.

3. Thermochronology
We use helium thermochronological method to date rocks, i.e. we try to find out when the rocks cooled down below certain temperature, from which we imply specific geological processes. In combination with structural analyses and morphotectonic research we study the interaction of erosion, tectonic, and climatic processes which formed the relief of Bohemian Massif and try to reconstruct its geodynamic evolution in relation to interaction with Alpine-Carpathian Orogeny.

4. Landscape evolution and morphostructural analysis of landforms 
This topic incorporates various studies focused on landscape evolution or further morphostructural analyses of landforms. Main interest is in regions with large regional faults or volcanoes.

5. Dynamics and long-term evolution of slope deformation 
Within the topic, we study a dynamics and long-term evolution of slope deformations. Besides the evaluation of the landslide activity and hazard assessment, our department focuses on structural and tectonic conditions predisposing the slope development. Our team is also involved in the landslide monitoring activities, including invention and development of the monitoring techniques and their automation.

International Cooperation

Polish Geological Survey (Państwowy Instytut Geologiczny - PIB),Wroclaw
Poland
University of Wrocław (Uniwersytet Wrocławski)
Poland
Komenský University Bratislava
Slovakia
University of Göttingen
Germany
UNAM (Querétaro, Mexico city)
Mexico

prof. Ramon Zuniga, project: Caracterizacion de fallas sismogenicas en el centro del cinturon volcanico mexicano: implicaciones para la peligrosidad sismica y la inestabilidad de laderas, 2011-2013, CONACYT, Mexico.

Investigators: prof. Ramon Zuniga, RNDr. Petra Stepancikova, Ph.D.

Leipzig University
Germany
San Diego State University
USA

Project: LH12078 - Assessment of Tectonic Movements on Active Faults (2012-2015, MSM/LH)
Investigator: P. Stepancikova, prof. Thomas Rockwell

Oregon State University
USA
University of Barcelona
Spain

Faculty of Geology, Dpt. Geodynamics and Geophysics:

Article: Combining new airborne LiDAR data and provenance of alluvial fan deposits to constrain long - term offsets along the Elsinore fault in the Coyote Mountains, Imperial Valley, California. prof. Eulalia Masana,

Paris Globe Institute of Physics (Institut de Physique du Globe de Paris - Université de Paris)
France
The University of Vienna, Faculty of Earth Science, Geography and Astronomy Department of Deodynamics and Sedimentology
Austria

Project: 7AMB13AT023 - Neotectonics in the Alpine-Carpatian Foreland (2013-2014, MSM/7A) Investigator: Dr. Kurt Decker, RNDr. Petra Stepancikova, Ph.D.

University of Sheffield
United Kingdom
Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Jena
Imperial College London
United Kingdom
University of Calcutta
India

Active Fault Mapping and Paleoseismology along the Himalayan Frontal Thrust, Mishmi thrust and the Naga Thrust within the Quaternaries, North Eastern India

Department of Geology and Mining,
Government of Jammu and Kashmir
India
Tel-Aviv University, Department of Geosciences
Israel

Project: A Paleoseismic Record of Earthquakes for the Dead Sea Transform Fault between the First and Seventh Centuries C.E., Dr. Neta Wechsler, Ph.D., Prof. Thomas Rockwell, Dr. Yann Klinger, Ph.D.

Geological Institute “Strashimir Dimitrov” Bulgarian Academy of Sciences (Sofia)
Bulgaria

Results

Geomorphological and geo/thermo-chronological responses of Indian plate’s deformation during neogene- quaternary time along the Eastern Himalayan Syntaxis: Formation of Manabhum anticline

2024

Goswami Chakrabarti Ch., Gülyüz E., Gülyüz N., Narzary B., Jaiswal M. K., Karaoglan F. (2024): Geomorphological and geo/thermo-chronological responses of Indian plate’s deformation during neogene- quaternary time along the Eastern Himalayan Syntaxis: Formation of Manabhum anticline. Journal of Asian Earth Sciences 260, 1, 105967. 
https://doi.org/10.1016/j.jseaes.2023.105967

Figure: Overview of the study area with respect to the Himalayas and Naga Schuppen belt. A. Generalized tectonic-geological map of the eastern part of the Indian plate after Haproff et al., 2018 and Li et al., 2015, B. Study area on Google Earth showing major orogenic belts, C. The Cartosat DEM showing the Manabhum anticline and major rivers. D. General N-S cross-section of Himalayan Orogen after Hauck et al., 1998 along the line XY showing in A and B.

Origin of block accumulations based on the near-surface geophysics

2023

Duffek V., Tábořík P., Stacke V., Mentlík P. (2023): Origin of block accumulations based on the near-surface geophysics. Open Geosciences 15(1), 20220468. 
https://doi.org/10.1515/geo-2022-0468

Figure: Location of the investigated areas and geological conditions. The key to the geological map has been simplified for the purpose of this research: Q = sediment (Q colluvial, Qh fluvial, orQh organic, aQ anthropogenic, Qp glaciogenic), gm = paragneiss, gco = paragneiss with garnet, g = granite, q = quartzite, sM = biotitic migmatite, i = aplite.

Neogene-Quaternary response of the Novohradské hory Mts. (Czech Republic) fluvial systems to tectonics – Analyses of morphotectonics, stream-length index and structural geology

2023

Flašar J., Martínek K., Verner K., Kalinová R. (2023): Neogene-Quaternary response of the Novohradské hory Mts. (Czech Republic) fluvial systems to tectonics – Analyses of morphotectonics, stream-length index and structural geology, Quaternary International 656, 1-15.  ISSN 1040-6182. 
https://doi.org/10.1016/j.quaint.2023.01.008

Paleoseismology of a Major Crustal Seismogenic Source near Mexico City: The Southern Border of the Acambay Graben

2023

León-Loya R., Lacan P., Ortuño M., Zúñiga F. R., Štěpančíková P., Stemberk J., Hernández Flores A. P., Carrera Hernández J. J., Sunyé-Puchol I., Aguirre-Díaz G., Audin L. (2023): Paleoseismology of a Major Crustal Seismogenic Source near Mexico City: The Southern Border of the Acambay Graben. Tectonics 42, e2022TC007610. https://doi.org/10.1029/2022TC007610

New developments in onshore paleoseismic methods, and their impact on Quaternary tectonic studies

2023

McCalpin J., Ferrario F., Figueiredo P., Livio F., Grützner C., Pisarska-Jamroży M., Quigley M., Reicherter K., Rockwell T., Štěpančíková P., Tábořík P. (2023): New developments in onshore paleoseismic methods, and their impact on Quaternary tectonic studies. Quaternary International 664, 59-76. 
https://doi.org/10.1016/j.quaint.2023.03.008

Neogene restoration of geometry of the Neotethyan suture zone in Central Anatolia (Turkey).

2023

Özkaptan M., Gülyüz E., Kaymakcı N., Langerei C. (2022): Neogene restoration of geometry of the Neotethyan suture zone in Central Anatolia (Turkey). International Geology Review 64 (21), 2985-3004. ISSN 0020-6814. E-ISSN 1938-2839. https://doi.org/10.1080/00206814.2021.2010133

Could long valley glaciers have been extended in the Bohemian Forest? Geophysical insights from Großer Rachel Region

2023

Papež D., Duffek V., Mentlík P., Tábořík P. (2023): Could long valley glaciers have been extended in the Bohemian Forest? Geophysical insights from Großer Rachel Region. Acta Geodynamica et Geomaterialia 20, No. 3 (211), 103–110. DOI: https://doi.org/10.13168/AGG.2023.0010

First paleoseismic data from the Balkan Range

2023

Radulov A., Dilov T., Rockwell T., Štěpančíková P., Yaneva M., Donkova Y., Stemberk J., Sana H., Nikolov N. (2023): First paleoseismic data from the Balkan Range. Tectonophysics 863, 230009. https://doi.org/10.1016/j.tecto.2023.230009

The geo/thermo-chronology of Dismal Island (Marguerite Bay, Antarctic Peninsula)

2023

Karaoğlan F., Karataş B., Özdemir Y., Gülyüz E., Vassilev O., Selbesoğlu M. O., Gildir S. (2023): The geo/thermo-chronology of Dismal Island (Marguerite Bay, Antarctic Peninsula). Turkish Journal od Earth Sciences, 32, 975-988. doi:10.55730/1300-0985.1887

Torkham Rockslide of April 18, 2023, in Pakistan: an interplay of geomorphology, geology, slope cutting, and climate

2023

Sana H., Ullah R., Zinke R., Fielding E. (2023): Torkham Rockslide of April 18, 2023, in Pakistan: an interplay of geomorphology, geology, slope cutting, and climate. Landslideshttps://doi.org/10.1007/s10346-023-02164-x

Multiphase deformation, fluid flow and mineralization in epithermal systems: Inferences from structures, vein textures and breccias of the Kestanelik epithermal Au-Ag deposit, NW Turkey

2022

Gülyüz N., Shipton Z. K., Kuşcu İ (2022): Multiphase deformation, fluid flow and mineralization in epithermal systems: Inferences from structures, vein textures and breccias of the Kestanelik epithermal Au-Ag deposit, NW Turkey. Turkish Journal of Earth Sciences. Manusctipt no. YER-2206-13, accepted 2022. 10.55730/1300-0985.1828IF2021 1.543 (Q4)

Projects

Thermochronology Laboratory for Low Temperature (U-Th)/Helium Dating

Alphachron

Thermochronology is the study of the thermal history of rocks. We date minerals such as e.g. apatite and zircon using (U-Th)/Helium dating to investigate when a rock sample has last experienced temperatures between ~40-70°C and 120-180°C respectively. For a standard geothermal gradient of ~25°C/km for the upper crust these temperatures correspond to depths of ~1.5 - 3 and 5 - 7 km.


The method utilizes α-decay of 238U and 232Th (parent isotopes), a process producing 4He atoms (daughter isotopes) which are only preserved below specific temperatures in the targeted minerals. This allows us to pinpoint the time when these temperature thresholds were crossed, by measuring all three isotopes and solving the decay equation. 

This method requires careful selection of ideal target mineral crystals under microscope conditions as well as high sensitivity analysis of the parent (U/Th) and daughter (He) isotope ratio to obtain precise, accurate and reproducible data. Our new laboratory enables us to do that. 

At the IRSM we will be using this technique to investigate the Cenozoic tectonic and erosional development of the Czech Republic, Europe and beyond (check webpage of our department for current projects).