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Geological Society, London, Special Publications; 1998; v. 141; p. 137-155;
DOI: 10.1144/GSL.SP.1998.141.01.09
© 1998 Geological Society of London

Analysis of erosion events and palaeogeothermal gradients in the North Alpine Foreland Basin of Switzerland

R. Schegg1,3 & W. Leu2

1 Department of Geology and Palaeontology, University of Geneva, 13, rue des Maraîchers, CH-1211 Geneva 4, Switzerland
2 Geoform, Geological Consulting and Studies Ltd, Anton Graff-Str. 6, CH-8401 Winterthur, Switzerland
Petroconsultants SA, Chemin de la Mairie 24, 1258 Perly, Switzerland

For basin modelling purposes, uplift and erosion analysis is as important as subsidence analysis. Within the North Alpine Foreland Basin of Switzerland (NAFB) three major interregional unconformities separate the sedimentary succession: the late Palaeozoic, the base Tertiary and the base Quaternary unconformity. The amount of missing section depends on the palaeogeographic basin position and on different inversion mechanisms (thermal uplift, intraplate stress, tectonic uplift or isostatic rebound movements). Several techniques exist to determine the magnitude and timing of maximum palaeotemperatures and palaeogradients, facilitating direct estimation of missing section. In our study coalification and fission track data are analysed and compared with recently published models concerning erosion in the NAFB. The results indicate that each inversion episode is accompanied by significant erosion (up to several km). The following range of removed section values were reconstructed:

(i) late Palaeozoic unconformity: 1000–1200 m;
(ii) base Tertiary unconformity: 800–1800 m;
(iii) base Quaternary unconformity: 1500–3000 m in the SW, up to 700 m in the NE and 4100–4400 m in parts close to the Alpine front.

The reconstruction techniques provide only rough estimates as each approach is based on certain assumptions and calibration uncertainties. Also, the obtained values are higher than those expected from simple evaluation of the preserved stratigraphic record. Calculated palaeogeothermal gradients are very high (80–90 °C km–1) during the late Palaeozoic, slightly higher than normal during the late Cretaceous (30–50 °C km–1) and lower than normal (15–30 °C km–1) during the Cenozoic.





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