In this work we also individuate and introduce the eastern termination of the Iberia-Eurasia plate boundary. This is the Marguareis extensional system of the Brianconnais Domain of the SW Alps. The crustal-scale Marguareis extensional system involves Paleozoic and Mesozoic rocks and includes a tens of km long transfer fault flanking an extensional domino array that accounted for ca. 21cm of extension along 6 km long sections. When post-Cretaceous alpine rotation is removed, the mid-Cretaceous transfer fault and the extension direction of the Marguareis extensional system become oriented parallel to those of the other portions of the plate boundary, indicating its pertinence to the Bay of Biscay-Pyrenean rift system.
In this work we provide a reappraisal of the mid-Cretaceous extensional basins located to the east of the Pyrenean mountain ranges, from the easternmost portion of Iberia to the Brianconnais Domain of the Western Alps fold-and-thrust belt. These features are reviewed and compared with those of the Bay of Biscay-Pyrenean rift, with the aim of defining geometry, kinematics, timing and lateral extent of the eastern termination of the Mesozoic Iberia-Eurasia plate boundary. Timing and direction of extension, as well as the style of structural segmentation in the Bay of Biscay - Pyrenean rift, are similar to those of basins exposed to the east of the Pyrenean mountain ranges. In both areas, the divergent movement between Iberia and Eurasia caused NNE-SSW oriented extension recorded in WNW-ESE elongated Late Jurassic to mid-Cretaceous basins, segmented by NNE-SSW trending transfer zones.
The Iberia-Eurasia plate boundary east of the Pyrenees
Piana F;
2018
Abstract
In this work we provide a reappraisal of the mid-Cretaceous extensional basins located to the east of the Pyrenean mountain ranges, from the easternmost portion of Iberia to the Brianconnais Domain of the Western Alps fold-and-thrust belt. These features are reviewed and compared with those of the Bay of Biscay-Pyrenean rift, with the aim of defining geometry, kinematics, timing and lateral extent of the eastern termination of the Mesozoic Iberia-Eurasia plate boundary. Timing and direction of extension, as well as the style of structural segmentation in the Bay of Biscay - Pyrenean rift, are similar to those of basins exposed to the east of the Pyrenean mountain ranges. In both areas, the divergent movement between Iberia and Eurasia caused NNE-SSW oriented extension recorded in WNW-ESE elongated Late Jurassic to mid-Cretaceous basins, segmented by NNE-SSW trending transfer zones.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
