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Journal of Palaeogeography  2024, Vol. 13 Issue (4): 675-705    DOI: 10.1016/j.jop.2024.07.001
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The “underfilled trinity model” of foreland basins revisited: reality or myth?
Xiu-Mian Hua,*, Eduardo Garzantib, Juan Lia, Marcelle BouDagher-Fadelc, 1, Giovanni Colettib, An-Lin Maa, Wen-Dong Lianga,b, Wei-Wei Xuea
aState Key Laboratory of Mineral Deposits Research, Institute of Continental Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
bDepartment of Earth and Environmental Sciences, Università di Milano-Bicocca, Milano 20126, Italy;
cDepartment of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK

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Abstract  

The “underfilled trinity” model of foreland-basin stratigraphy was proposed based on the observation that the initial sedimentary stages along the western and northern front of the western and central Alps were represented by shallow-water carbonates (Calcaires à Nummulites) overlain by hemipelagic marls (Marnes Bleues) and capped by siliciclastic turbidites (Grès d’Annot). Subsequently, this model has been widely accepted and applied in foreland basins worldwide. We here re-investigated the Eocene-Oligocene sedimentary succession of the Western Alps to check its validity. Major geological features of this region include: i) the existence of a Cretaceous-Eocene unconformity spanning more than 25 Myr in the studied sections; ii) a virtually synchronous age of the Calcaires à Nummulites, Marnes Bleues, and Grès d’Annot formations across the Western Alps; iii) a long-term deepening-upward trend, from inner to outer ramp, documented by the Calcaires à Nummulites, followed by the pelagic Marnes Bleues and by the Grès d’Annot turbidites; iv) the provenance of the Grès d’Annot Formation from the Maures-Estérel Massif and/or Corsica-Sardinia block in the south, rather than from the Alpine orogen in the east. By integrating field observations, sedimentological, biostratigraphic, and provenance analyses, we found the Eocene “underfilled foreland” model too simplistic and inadequate to explain the basin evolution in the western Alpine region. Based on the alternative scenario proposed herein, the Annot and Barrême basins formed in the late Eocene (40-35 Ma) in an extensional/transtensional setting during a period of major change in tectonic stress fields across western Europe on the upper plate of the Apennine subduction.

Key wordsWestern Alps      Paleogene      Annot basin      Foreland-basin models      Flysch and molasse stages      Apenninic subduction     
Received: 17 April 2024     
Corresponding Authors: * E-mail address: huxm@nju.edu.cn (X.-M. Hu).   
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http://journal09.magtechjournal.com/Jweb_jop/EN/10.1016/j.jop.2024.07.001     OR     http://journal09.magtechjournal.com/Jweb_jop/EN/Y2024/V13/I4/675
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