Ultramafic rocks in the north patagonian andes: Is their emplacement associated with the neogene tectonics of the liquiñe-ofqui fault zone?
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Fecha
2017-01
Profesor/a Guía
Facultad/escuela
Idioma
es
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Editor
Servicio Nacional de Geologia y Mineria
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Licencia CC
Attribution 4.0 International
CC BY 4.0
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Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
Serpentinites and fresh or partially serpentinized harzburgite crop out in the western slope of the North Patagonian Andes of continental Chiloé (41°44’-42°12’S). These rocks are spatially associated with low-grade metamorphic rocks containing Cenozoic detrital zircons. The metamorphic rocks, together with Devonian metasediments, have been mapped previously as Late Paleozoic-Triassic metamorfic complex, an age no longer tenable for at least part of the complex. Transpressional tectonic emplacement of the ultramafic body or bodies is thought to have been related to activity on the Liquiñe-Ofqui Fault Zone, following a late Oligocene-Early Miocene extensional phase in the forearc region of the present Andes. This fault zone occurs immediately east of the outcrops of the ultramafic rocks and has been interpreted previously as generating a hemi-flower or flower structure. © 2017, Servicio Nacional de Geologia y Mineria. All Rights Reserved.
Notas
Indexación: Scopus
Palabras clave
Liquiñe-Ofqui fault zone, Neogene tectonics, North patagonian andes, Serpentinites
Citación
Andean Geology Volume 44, Issue 1, Pages 1 - 16January 2017
DOI
10.5027/andgeoV44n1-a01