期刊
INTERNATIONAL GEOLOGY REVIEW
卷 64, 期 1, 页码 72-95出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00206814.2020.1839798
关键词
Famatinian orogeny; Gondwanan orogeny; Palaeozoic metamorphisms; geodynamic evolution; North Patagonian Andes
类别
资金
- projects PIP-CONICET of Argentina [112-201101-00324]
- TORANDES of the Spanish I+D+i Plan with FEDER Funds of the European Union [CGL2012-38396-C03]
Metamorphic rocks along the North Patagonian Andes were affected by two different Palaeozoic tectono-metamorphic events, leading to their classification into the Colohuincul Complex and the Cushamen Complex. By distinguishing these units, researchers aim to better understand the geodynamic evolution of the Gondwana southwestern margin during the Palaeozoic.
The presence of metamorphic rocks along the North Patagonian Andes is well known. All these metamorphic rocks are intruded by plutonic igneous rocks of Devonian, Carboniferous and Permian ages. The geographic localization of these rocks in the same geological province led to a first approach to grouping them under the same lithostratigraphic unit (Colohuincul Complex). Later studies, based on geological mapping and geochronological, structural and petrological data, gave an account of the differences among these rocks. The main distinction is that these metamorphic rocks were affected by two dissimilar Palaeozoic tectono-metamorphic events. The oldest one is related to a lower Palaeozoic orogenic event (Famatinian orogeny) and the other one to an upper Palaeozoic event (Gondwanan orogeny). For this reason, it is necessary to distinguish and group the metamorphic rocks from the North Patagonian Andes basement in two different tectonostratigraphic units: the Colohuincul Complex (Cambrian-Ordovician) and the Cushamen Complex (middle Silurian-early Carboniferous) in order to better understand the geodynamic evolution of the Gondwana southwestern margin during the Palaeozoic.
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