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International Journal of Earth Sciences

, Volume 108, Issue 6, pp 1913–1936 | Cite as

Subsurface granites in the Franconian Basin as the source of enhanced geothermal gradients: a key study from gravity and thermal modeling of the Bayreuth Granite

  • Helga de WallEmail author
  • Anna Schaarschmidt
  • Marion Kämmlein
  • Gerald Gabriel
  • Michel Bestmann
  • Lars Scharfenberg
Original Paper
  • 106 Downloads

Abstract

The Franconian Basin in NE Bavaria is a region of gravity low between the Bohemian Massif in the east and the Kraichgau Terrane in the west. Borehole measurements have identified the northern part of the Franconian Basin as a regional geothermal anomaly and new heat flow calculations give values of  > 100 mW/m2. Distinct negative Bouguer anomalies observed in this basin are modeled as granitic intrusions in the Saxothuringian basement that underlies the Permo-Mesozoic units. The interpretation of gravity gradients, in combination with the filtering of gravity data, gives the possible depth constraints of the intrusive bodies. The resulting depths were cross-checked using microstructural studies of quartz veins in the basement rocks (at > 1341 m depth). The quartz shows structures typical for low-temperature plasticity and we infer a deformation temperature of ca. 300 °C. This indicates a considerable pre-Permian uplift of at least 7 km for parts of the Saxothuringian basement and supports depth estimates from gravity data. The heat supply of granitic intrusions by radiogenic decay is modeled considering several scenarios for the geological conditions recovered by the Obernsees borehole (model for conductive heat transfer). The 1390 m-deep drillhole is in a marginal position to the most-pronounced negative Bouguer anomaly. It could be shown that the Saxothuringian basement, including heat-producing granites (heat production rates: 4–6 μW/m3), covered by the insulating sedimentary rocks (1.35 km of Permian to Lower Jurassic units), can account for the enhanced geothermal gradient (38 °C/km) that were measured in the borehole.

Keywords

Gravity anomalies Variscan granites Radiogenic heat Thermal modeling Quartz microfabric 

Notes

Acknowledgements

We thank Carlo Dietl (Gesteinslabor Dr. Eberhard Jahns, Heiligenstadt) and Peter Skiba (LIAG Hannover) for discussion. Timo Spörlein, Volker Friedlein, Georg Büttner (LfU Hof) are thanked for their support and provision of core material for our analytical work. We are grateful to Dave Tanner (LIAG Hanover) who helped to improve the text of the manuscript. Funding by the Ministry of Environment of Bavaria State is gratefully acknowledged. We are very thankful to A. Guy and J. Sippel for their helpful and very constructive reviews.

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Copyright information

© Geologische Vereinigung e.V. (GV) 2019

Authors and Affiliations

  1. 1.GeoZentrum NordbayernFriedrich-Alexander-Universität Erlangen-NürnbergErlangenGermany
  2. 2.Leibniz-Institut für Angewandte GeophysikHannoverGermany
  3. 3.Department f. Geodynamik u. Sedimentologie, Department f. LithosphärenforschungUniversität WienViennaAustria

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