Abstract
The Upper Rhine Graben (URG) is the most perceptible part of the European Cenozoic Rift System. Uplifted Variscan basement of the Black Forest and the Vosges forms the flanks of the southern part of the graben. Apatite and zircon fission-track (FT) analyses indicate a complex low-temperature thermal history of the basement that was deciphered by inverse modelling of FT parameters. The models were tested against the observed data and independent geological constraints. The zircon FT ages of 28 outcrop samples taken along an E–W trending transect across the Black Forest and the Vosges range from 136 to 312 Ma, the apatite FT ages from 20 to 83 Ma. The frequency distributions of confined track lengths are broad and often bimodal in shape indicating a complex thermal history. Cooling below 120°C in the Early Cretaceous to Palaeogene was followed by a discrete heating episode during the late Eocene and subsequent cooling to surface temperature. The modelled time–temperature (t–T) paths point to a total denudation of the flanks of URG in the range of 1.0–1.7 km for a paleogeothermal gradient of 60°C/km, and 1.3–2.2 km for a paleogeothermal gradient of 45°C/km since the late Eocene.
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Acknowledgements
This work has been supported by the Swiss National Science Foundation (Project Nos. 21-57038.99 and 20-64567.01). We thank M. Brix, U.A. Glasmacher and M. Rahn for their constructive comments and suggestions that substantially improved the manuscript.
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Appendix
Appendix
Modelling details
This appendix (Tables 4, 5) contains information about parameters used for inverse modelling. The time for the first constraint was chosen based on the consideration that this time should be somewhat earlier than the FT age of the oldest and thus most resistant apatite grains to allow for age reduction by partial annealing (Ketcham et al. 2000). Thus, the temperature for the first constraint was set at ~130°C providing that there are no fission tracks present as an initial condition. Modelled t–T paths were initially defined to be non-monotonic, aiming at finding solutions by the program, particularly any possible heating events and their timing. The initial model runs also constrain the time of cooling below the track retention temperature, which can be used as initial constraints for subsequent model runs. In a next step, the new initial constraint and additional intermediate constraints were used to better evaluate individual heating and cooling events. Model runs were so gradually refined by forcing restrictions on the t–T paths as suggested by consecutive modelling results and geological observations.
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Timar-Geng, Z., Fügenschuh, B., Wetzel, A. et al. Low-temperature thermochronology of the flanks of the southern Upper Rhine Graben. Int J Earth Sci (Geol Rundsch) 95, 685–702 (2006). https://doi.org/10.1007/s00531-005-0059-1
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DOI: https://doi.org/10.1007/s00531-005-0059-1