Tectonique distensive et halocinese d'age jurassique; la zone subbrianconnaise en Maurienne (Savoie)

Preliminary estimates of lithospheric stretching have been made by examining 63 stratigraphic sections, from the northern and southern Tethyan margins (southeast France to Bulgaria). The study was centred on the Italian Southern Alps (the Dolomites), a portion of the southern margin within the external zones of the Alpine orogen. Sections were decompacted and backstripped using the standard procedure, allowing for errors in palaeowater-depth estimates. Theoretical subsidence curves based on the finite-duration stretching model were then fitted to the resultant water-loaded subsidence curves in an attempt to clarify the pre-compressional tectonic history of the region. According to our results, stretching started in the early to mid-Triassic and lasted 30–40 Ma. This conclusion is broadly in agreement with some previously published estimates. The stretching factor, β, is generally small (1.1–1.3), especially in southeast France and northern Italy. Larger values of β occur in the Balkans ( c. 1.5). To our knowledge, the finite-duration stretching model has not yet been applied to water-loaded stratigraphic sections from the Tethyan belt. Theory and observation appear to agree well.

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Measuring lithospheric stretching on Tethyan passive margins

Wooler

Smith

White

1992

JGS

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The inverted margin of the French Alps and foreland basin inversion

Graciansky

Dardeau

Lemoine

et al. 1989

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The whole of the Western Alpine realm can be considered to result from the inversion of the European margin of Ligurian Tethys as a consequence of the collision between Apulia and Europe. The margin was developed due to Tethyan rifting during the Liassic and Middle Jurassic and regional thermal subsidence as the Ligurian ocean was spreading in the Late Jurassic and Early Cretaceous. Coevally, the margin underwent additional stretching in response to North Atlantic rifting. Inversion was initiated by Late Cretaceous times when the Ligurian oceanic crust began to be subducted, with localized obduction, beneath the previously passive margin. The most recent inversion of the Western Alps occurred in the external Molasse basin of Manosque-Digne-Valensole during the Late Miocene and Pliocene. Regions of mild inversion allow useful comparisons to be made with more strongly inverted basins. The geometric characteristics of the inverted basins depend on the lithology, geometry of the extensional structures, orientation of extensional faults with respect to the compressive Alpine stresses and the amount of compression. Comparisons of the external and internal zones suggest that the ductilely deformed thrust sheets may have originated from inverted half-grabens.

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Tectonique distensive et halocinese d'age jurassique; la zone subbrianconnaise en Maurienne (Savoie)

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Measuring lithospheric stretching on Tethyan passive margins

Measuring lithospheric stretching on Tethyan passive margins

The inverted margin of the French Alps and foreland basin inversion

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