Moyen, J.-F., Guy, A., Fiannacca, P., Janoušek, V., Villaseca, C. and Arribas, P. 2025. Granites and the nature of the Variscan crust Elements. 21, 415–421.
DOI Google ScholarCLR person interests, research and publications
Researcher
Dr. Alexandra Guy
Research fellow
Geophysical and geological characterization of the crust
+420257089475
alexandra.guy@geology.cz
RID:
G-6036-2014
Research interests
- Geophysical characterization of accretionary and collisional orogenic systems
- Architecture of continental lithosphere with forward and inverse modeling of gravity and magnetic anomalies
- Structural geology and tectonics of orogenic systems
Current research topics
My work is focused on geological interpretation of the Earth's gravity and magnetic fields by studying potential field data combined with structural analysis, magmatic rock geochemistry, petrophysical data and seismics. This multidisciplinary approach constrains the structure of the lithosphere. My research strength is the treatment, the interpretation and the synthesis of large sets of geophysical and geological data in order to model (forward and inverse modeling) the structure of the lithosphere from regional to large scale. The obtained geophysical models contribute to reconstruct consistent tectonic evolution of accretionary and collisional orogenic systems.
Research projects
Moho depth model and lithospheric structures from GOCE gravity gradient data for the Central Asian Orogenic Belt
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The Central Asian Orogenic Belt (CAOB) is an accretionary orogen covering one third of Asia. Guy et al. (2014) demonstrate by the correlation between geology and potential field data that the systematic use of lithostratigraphic terranes to define the CAOB is not appropriate.
The role of Paleozoic accretionary and collisional orogens on the formation and growth of continental crust
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Selected segments of Euroasian orogenic system are used to constrain relative contribution of contrasting processes of continental construction in collisional and accretionary orogenic systems. Principal objectives of the proposal are: (i) identification of the individual terranes, kinematic analysis of their movements and characterization of deformation style connected with their amalgamation; (ii) estimation of net crustal growth vs. recycling of preexistent crustal material.
Crustal growth and construction of continental crust exemplified by Central Asian Orogenic Belt
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On the modern Earth, continental crust is created mainly at subduction zones. Here, release of aqueous fluid from dehydrating oceanic crust causes melting in the mantle wedge and generates the calc-alkaline magmas that evolve into granitoid continental crust. This project aims to understand crustal growth and possible crustal construction mechanisms, using the Mongolian and Chinese tract of the Central Asian Orogenic Belt (CAOB) as an example. The main questions raised here are: What were the cause, rate and timing of continental growth in the CAOB?
Geodynamic evolution of western Gondwana – insights from central Hoggar (Algeria) and the Kaoko Belt (Namibia)
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The project will study timing and dynamics of collisional processes in the Tuareg Shield (central Hoggar, Algeria). The data will be used for evaluation of the models of multiple subductions in the Tuareg Shield and for understanding whether the closure of different oceanic domains in this part of West Gondwana was synchronous or not. The results of the project will provide improved picture of Neoproterozoic geodynamic evolution of northern part of the western Gondwana suture.
Decoding the lithospheric structure of Central Asia through cluster analysis and geophysical modelling
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This project investigates the lithospheric structure of the Mongolian collage part of the Central Asian Orogenic Belt, shaped by multiple accretion and collision processes. To decode this orogen, we will combine cluster analysis with geophysical inverse and forward modelling to address the occurrence of a felsic relaminant and its extent, and to examine the suture zones and subductions involved in the Mongolian oroclinal bending.
Publications
Soejono, I., Collett, S., Schulmann, K., Štípská, P., Míková, J., y, V., Novotná, N. and Guy, A. 2025. Neoproterozoic paleogeography and displacement of the Mongolian blocks constrained by detrital zircon ages and Hf isotopic systematics (Zavkhan Block, W Mongolia) Precambrian Research. 417, 107657.
DOI Google ScholarSchulmann, K., Zhang, J., Miao, Y., Guy, A., Soejono, I., Jiang, Y., Sun, M. and Shu, T. 2025. Geologically and geophysically constrained kinematic model of the interaction between Mongolian and Kazakhstan collages and the Junggar Block indentation Journal of the Geological Society. jgs2024–050.
DOI Google ScholarSoejono, I., Collett, S., Schulmann, K., Štípská, P., Míková, J., Peřestý, V., Novotna, N. and Guy, A. 2025. Neoproterozoic paleogeography and displacement of the Mongolian blocks constrained by detrital zircon ages and Hf isotopic systematics (Zavkhan Block, W Mongolia) Precambrian Research. 417, 107657.
DOI Google ScholarMiao, Y., Zhang, J., Schulmann, K., Guy, A., Soejono, I., Jiang, Y., Sun, M., Zhang, S. and Li, Z. 2024. Switching from subduction zone advance to retreat explains the late Paleozoic evolution of the East Junggar system, Central Asian Orogenic Belt Tectonics. 43, e2024TC008254.
DOI Google ScholarGuy, A., Tiberi, C. and Mijiddorj, S. 2024. Crustal structures from receiver functions and gravity modeling in central Mongolia Journal of Geophysical Research: Solid Earth. 129, e2023JB027614.
DOI Google ScholarGuy, A., Eagles, G. and Eisen, O. 2024. Tectonic structures of the Dome Fuji region, East Antarctica, based on new magnetic data Scientific Reports. 14, 18607.
DOI Google ScholarSoejono, I., Janoušek, V., Peřestý, V., Schulmann, K., Svojtka, M., Hanžl, P., Hora, J., Míková, J., Štípská, P., Guy, A., Collett, S. and Otgonbaatar, D. 2023. From Rodinian passive margin to peri-Siberian continental arc: Evidence from the multiphase Neoproterozoic–early Paleozoic magmatic record of the Zavkhan Block in the Mongolian Collage Gondwana Research.
DOI Google ScholarMiao, Y., Zhang, J., Schulmann, K., Guy, A., Jiang, Y., Sun, M., Zhang, S. and Wang, S. 2023. Crustal-scale disharmonic structural pattern of West Junggar: Unveiling a Permian indentation of Junggar Block into northern Kazakhstan Orocline Tectonics. 42, e2022TC007689.
DOI Google ScholarSchulmann, K., Edel, J.B., Catalán, J.R.M., Mazur, S., Guy, A., Lardeaux, J.-M., Ayarza, P. and Palomeras, I. 2022. Tectonic evolution and global crustal architecture of the European Variscan belt constrained by geophysical data Earth-Science Reviews. 104195.
DOI Google ScholarGuy, A., Schulmann, K., Soejono, I., Holzrichter, N., Lexa, O. and Munschy, M. 2021. Structures and geodynamics of the Mongolian tract of the Central Asian Orogenic Belt constrained by potential field analyses Gondwana Research.
DOI Google ScholarKrýza, O., Lexa, O., Schulmann, K., Guy, A., Gapais, D., Cosgrove, J. and Xiao, W. 2021. Oroclinal buckling and associated lithospheric-scale material flow – insights from physical modelling: Implication for the Mongol-Hingan orocline Tectonophysics. 800, 228712.
DOI Google ScholarSoejono, I., Bukovská, Z., Levá, B., Skácelová, Z., Hejtmánková, P., Guy, A., Jelínek, J., Švagera, O., Kryl, J., Holeček, J. and 2021. Interdisciplinary geoscientific approach to radioactive waste repository site selection: the Březovy potok site, southwestern Czech Republic Journal of Maps. 17, 882–890.
Google ScholarHanžl, P., Guy, A., Battushig, A. and Lexa, O. 2020. Geology of the Gobi and Mongol Altai junction enhanced by gravity analysis: a key for understanding of the Mongolian Altaides.
DOI Google ScholarGuy, A., Schulmann, K., Soejono, I. and Xiao, W. 2020. Revision of the Chinese Altai-East Junggar Terrane Accretion Model Based on Geophysical and Geological Constraints Tectonics. 39, e2019TC006026.
DOI Google ScholarBroussolle, A., Sun, M., Schulmann, K., Guy, A., Aguilar, C., Štípská, P., Jiang, Y., Yu, Y. and Xiao, W. 2019. Are the Chinese Altai “terranes” the result of juxtaposition of different crustal levels during Late Devonian and Permian orogenesis? Gondwana Research. 66, 183–206.
DOI Google ScholarGuy, A., Holzrichter, N. and Ebbing, J. 2017. Moho depth model for the Central Asian Orogenic Belt from satellite gravity gradients Journal of Geophysical Research: Solid Earth. 122, 7388–7407.
DOI Google ScholarJiang, Y., Schulmann, K., Sun, M., Štípská, P., Guy, A., Janoušek, V., Lexa, O. and Yuan, C. 2016. Anatexis of accretionary wedge, Pacific-type magmatism, and formation of vertically stratified continental crust in the Altai Orogenic Belt Tectonics. 35, 3095–3118.
DOI Google ScholarZhang, J., Sun, M., Schulmann, K., Zhao, G., Wu, Q., Jiang, Y., Guy, A. and Wange, Y. 2015. Distinct deformation history of two contrasting tectonic domains in the Chinese Altai: their significance in understanding accretionary orogenic process Journal of Structural Geology. 73, 64–82.
DOI Google ScholarGuy, A., Schulmann, K., Janoušek, V., Štípská, P., Armstrong, R., Belousova, E., Dolgopolova, A., Seltmann, R., Lexa, O., Jiang, Y. and Hanzl, P. 2015. Geophysical and geochemical nature of relaminated arc-derived lower crust underneath oceanic domain in southern Mongolia Tectonics.
DOI Google ScholarGuy, A., Schulmann, K., Munschy, M., Miehe, J.-M., Edel, J.B. and Lexa, O. 2014. Geophysical constraints for terrane boundaries in southern Mongolia Journal of Geophysical Research. 119, 7966–7991.
Google ScholarGuy, A., Schulmann, K., Clauer, N., Hasalová, P., Seltmann, R., Armstrong, R., Lexa, O. and Benedicto, A. 2014. Late Paleozoic-Mesozoic tectonic evolution of the Trans-Altai and South Gobi Zones in southern Mongolia based on structural and geochronological data Gondwana Research. 25, 309–337.
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