Details

Autor(en) / Beteiligte

• Bois, C
• Meissner, Rolf
• Brown, Larry
• Franke, Wolfgang
• Seifert, Friedrich
• Dürbaum, Hans‐Jürgen
• Fuchs, Karl

Titel

Post‐Orogenic Evolution of the European Crust Studied from Ecors Deep Seismic Profiles

Ist Teil von

• Continental Lithosphere: Deep Seismic Reflections, 1991, p.59-68

Ort / Verlag

Washington, D. C: American Geophysical Union

Erscheinungsjahr

1991

Link zum Volltext

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• Recent deep seismic profiles acquired by the ECORS project have been compared to former surveys. The Gulf of Lions basement is a segment of the Pyrénées‐Provence belt beneath which the crustal root was removed in the late Eocene. Metamorphism and/or magmatic intrusion played a part in crustal removal as in the Variscan crust. The evolution of the crust beneath the Tertiary rifts of the Upper Rhinegraben, Bresse and the Gulf of Lions is characterized by a small extension of the basement, great crustal thinning, high P‐wave velocities in the deep crust and asthenospheric upwelling. Interpretation suggests that interactions between asthenosphere, lithosphere and crust should have occurred in relation to Alpine belt development. The Cretaceous and Triassic‐Jurassic basins also show a discrepancy between basement extension and crustal thinning, probably also related to interactions between mantle and crust. In contrast, the layered lower crust, unthinned beneath the Triassic‐Jurassic basins, suggests that underplating occurred during or after the crustal thinning which controlled basin subsidence. The present review shows that the Moho and, to a certain extent, the layered lower crust can be adjusted through time. Their changes were governed not only by mechanical deformation but also by transfer of material and modification of the physical properties near the crust‐mantle boundary.