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
en
Título de la revista
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Editor
Servicio Nacional de Geologia y Mineria
Nombre de Curso
Licencia CC
Licencia CC
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.
Notas
Indexación: Web of Science; Scopus.
Palabras clave
Serpentinites, North patagonian andes, Neogene tectonics, Liquiñe-Ofqui fault zone, Chile
Citación
Andean Geology. Volume 44, Issue 1, January 2017, Pages 1-16