Petrological constraints and PT path of Devonian collapse tectonics within the Scandinavian mountain belt (Western Gneiss Region, Norway)

Article Abstract:

The use of pressure-time (PT) indicators in rock structures was applied to the study of Devonian collapse tectonics. Information on the PT paths of eclogites in the Western Gneiss Region of Norway and the Devonian sedimentary basins validate the current theory that the geological structures were formed by Caledonian nappes overlapping, allowing crust thinning that rapidly thrusted upward the underlying high-pressure rock structures. Extensional movements on the opposition of the high-pressure rock structures may also explain the temperature increase indicated in the upthrusting.

Scandinavia

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Structure and kinematics of a sinistral transpressive suture between the Ossa-Morena and the South Portuguese Zones, South Iberian Massif

Article Abstract:

A study of the Iberian massif was conducted to verify the kinematics of the suture zone between the Ossa-Morena and South Portuguese Zones. The zone boundary is identified by a highly stressed amphibolite belt with the structure showing evidences of a consistent sinistral shear zone. A small zone in the study area show a transpressive shear and down-dip while another still retains older sinistral strike slip formations. Continental accretion from the Devonian to the Stephanian Periods was held responsible for the resulting structures.

Iberian Peninsula

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