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Review of the polyorogenic Palaeozoic basement of the Argentinean North Patagonian Andes: age, correlations, tectonostratigraphic interpretation and geodynamic evolution
International Geology Review ( IF 2.6 ) Pub Date : 2020-12-31 , DOI: 10.1080/00206814.2020.1839798
Samanta Serra-Varela 1, 2 , Nemesio Heredia 3 , Raúl Giacosa 1, 4 , Joaquín García-Sansegundo 5 , Pedro Farias 5
Affiliation  

ABSTRACT

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.



中文翻译:

阿根廷北巴塔哥尼亚安第斯山脉多造山古生代基底的回顾:年龄、相关性、构造地层解释和地球动力学演化

摘要

众所周知,北巴塔哥尼亚安第斯山脉沿线存在变质岩。所有这些变质岩都被泥盆纪、石炭纪和二叠纪的深成岩火成岩侵入。这些岩石在同一地质省的地理定位导致了将它们分组在同一岩石地层单元(Colohuincul Complex)下的第一种方法。后来的研究基于地质绘图和年代学、构造和岩石学数据,说明了这些岩石之间的差异。主要区别在于这些变质岩受到两个不同的古生代构造变质事件的影响。最古老的一个与下古生代造山事件(法马蒂尼亚造山运动)有关,另一个与上古生界事件(冈瓦纳造山运动)有关。为此原因,

更新日期:2020-12-31
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