100 Myrs of cyclic mass flow in the Late Paleozoic accretion system of central Chile - Evidence for a new model based on PTtd-trayectories
Seminario a cura del Prof. Arne Willner - Ruhr-Universität Bochum.
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Data: 01 aprile 2015 dalle 16:00 alle 18:00
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Luogo: Aula M1, Sezione di Geologia - BiGeA, P.zza di P.ta San Donato 1, Bologna
Along the Coastal Cordillera of Chile between the latitudes 30° and 55°S fossil accretionary systems have been developed partly at the passive margin of the microplate “Chilenia” after its collision with the western Gondwana margin at ~390 Ma (Lu-Hf mineral isochron). This evolution started in the late Palaeozoic in the north and continued during Mesozoic times in southern Chile. The areas of fossil accretionary systems in Chile provide an ideal laboratory for the study of deepseated levels of accretionary systems which are essentially composed of continent-derived metagreywackes with intercalations of 10-15% of disrupted oceanic crust.