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New geophysical and geological data on the Moldanubian plutonic complex and the Kaplice Fault, southern Bohemia

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Abstract

The paper presents a new structural model of the granitoid intrusions of the Moldanubian plutonic complex in southern Bohemiaeast of the town of Kaplice. Valuable archival gravity data were supplemented by magnetic survey and precise profile gravity measurements to better define the gravitational effect of the granitoid body and provide an accurate model solution. Our findings, based on geophysical analyses and modelling, bring new information on the shape and deep structure of the Moldanubian plutonic complex in southern Bohemia. These results are complemented by a tectonic investigation of the Freistadt granodiorite body and the Kaplice Fault. New information on the geometry of the Kaplice Fault plane acquired from Linsser indications is discussed in relation to its possible recent seismic activity. The usefulness of the Linsser indications method for active tectonic studies is demonstrated. This is the first regional study in this insufficiently known part of the Bohemian Massif, providing new information on the extent of granites and their relationship to one of the most significant faults in this area.

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Magnetic anomalies adapted from Šalanský (1995)

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Acknowledgements

This contribution was prepared based on research at the Institute of Hydrogeology, Engineering Geology and Applied Geophysics of the Faculty of Science, Charles University in Prague. We wish to thank Jan Valenta of the same institute for valuable advice and comments on data processing and the interpretation model. The author would like to thank the Geosoft Ltd. Company for providing the sponsorship license for data processing in the Oasis Montage program. The authors are indebted to the Ministry of the Environment of the Czech Republic for providing airborne geophysical survey and surface gravity mapping in the study area. JČ and JA acknowledge the Czech Science Foundation (GACR; grant project 19-02177Y) and the institutional support provided by the Institute of Geology, Czech Academy of Sciences and assigned to RVO 67985831.

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Anastasiia, M., Jan, Č., Lubomil, P. et al. New geophysical and geological data on the Moldanubian plutonic complex and the Kaplice Fault, southern Bohemia. Int J Earth Sci (Geol Rundsch) 111, 1315–1331 (2022). https://doi.org/10.1007/s00531-022-02182-5

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