Many incompatible geodynamic models had been proposed to explain the landforms, the geomorphology, the geology, and the geodynamic of Earth Mountain belts (K.Mc Clay, S.Schmid, E.Kissling, J.Malavieille, M.Mattauer, among others). The orogens of the Earth are most of the time complex with so different types (e.g.: type 1: Cordilleras; type 2: Accreted terranes, type 3: Continent-continent, or type 4: Inverted rifts - synthesis of C.Francois et al., 2021).
Based on well documented case examples, we propose herein to compare some orogens of different ages in order to better understand their geodynamic, their geology and consequently their structural geomorphology. Using geological mappings, structural crustal cross-sections, geophysical data, we compare (1) the active Taiwan orogen (onshore and offshore), to (2) the Dinarides, to (3) the Occidental Alps, to (4) the Pyrenees and (5) the older French Massif Central/Britany. We look for the same major geodynamic units in all these orogens in order to propose their evolution through time and to deduce a unique simpler model of Earth Mountain Building. This general “generic scenario of Earth Mountain building evolution” is different from those proposed on each individual case examples. Our new model implies some modifications and up-dates on the existing Earth paradigms as we take into consideration the crust as a whole. Moreover, this model takes into account the deformation of the oceanic crust and the volcanoes evolution two abstracts includes in this session.
If this model is validated it should have numerous implications. Some of those will be described in the session.
To conclude, one may remember that (1) to better understand Structural Geomorphology it is compulsory to take into account both geology and geodynamics; (2) Observation of the Earth landforms give us information on the thin- and thick-skin crustal processes. The Geomorphological methods are also very useful to analyze deeper crustal structures.
Mots clés : Structural geomorphology|geology|geodynamics|Earth Sciences paradigms|Methodology
A105178BD