The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic

The Mejillonia terrane, named after the Mejillones Peninsula (northern Chile), has been traditionally considered an early Paleozoic block of metamorphic and igneous rocks displaced along the northern Andean margin in the Mesozoic. However, U–Pb SHRIMP zircon dating of metasedimentary and igneous roc...

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Autores principales: Casquet, César, Hervé, Francisco, Pankhurst, Robert J., Baldo, Edgardo, Calderón, Mauricio, Fanning, Christopher, Rapela, Carlos Washington, Dahlquist, Juan A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Geología
Mejillonia terrane
U–Pb SHRIMP zircon geochronology
Pre-Andean continental margin
Late Triassic subduction
Early Jurassic magmatic arc
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128410
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128410
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Mejillonia terrane
U–Pb SHRIMP zircon geochronology
Pre-Andean continental margin
Late Triassic subduction
Early Jurassic magmatic arc
spellingShingle Geología
Mejillonia terrane
U–Pb SHRIMP zircon geochronology
Pre-Andean continental margin
Late Triassic subduction
Early Jurassic magmatic arc
Casquet, César
Hervé, Francisco
Pankhurst, Robert J.
Baldo, Edgardo
Calderón, Mauricio
Fanning, Christopher
Rapela, Carlos Washington
Dahlquist, Juan A.
The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
topic_facet Geología
Mejillonia terrane
U–Pb SHRIMP zircon geochronology
Pre-Andean continental margin
Late Triassic subduction
Early Jurassic magmatic arc
description The Mejillonia terrane, named after the Mejillones Peninsula (northern Chile), has been traditionally considered an early Paleozoic block of metamorphic and igneous rocks displaced along the northern Andean margin in the Mesozoic. However, U–Pb SHRIMP zircon dating of metasedimentary and igneous rocks shows that the sedimentary protoliths were Triassic, and that metamorphism and magmatism took place in the Late Triassic (Norian). Field evidence combined with zircon dating (detrital and metamorphic) further suggests that the sedimentary protoliths were buried, deformed (foliated and folded) and metamorphosed very rapidly, probably within few million years, at ca. 210 Ma. The metasedimentary wedge was then uplifted and intruded by a late arc-related tonalite body (Morro Mejillones) at 208 ± 2 Ma, only a short time after the peak of metamorphism. The Mejillones metamorphic and igneous basement represents an accretionary wedge or marginal basin that underwent contractional deformation and metamorphism at the end of a Late Permian to Late Triassic anorogenic episode that is well known in Chile and Argentina. Renewal of subduction along the pre-Andean continental margin in the Late Triassic and the development of new subduction-related magmatism are probably represented by the Early Jurassic Bolfin–Punta Tetas magmatic arc in the southern part of the peninsula, for which an age of 184 ± 1 Ma was determined. We suggest retaining the classification of Mejillonia as a tectonostratigraphic terrane, albeit in this new context.
format Articulo
Articulo
author Casquet, César
Hervé, Francisco
Pankhurst, Robert J.
Baldo, Edgardo
Calderón, Mauricio
Fanning, Christopher
Rapela, Carlos Washington
Dahlquist, Juan A.
author_facet Casquet, César
Hervé, Francisco
Pankhurst, Robert J.
Baldo, Edgardo
Calderón, Mauricio
Fanning, Christopher
Rapela, Carlos Washington
Dahlquist, Juan A.
author_sort Casquet, César
title The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
title_short The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
title_full The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
title_fullStr The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
title_full_unstemmed The Mejillonia suspect terrane (Northern Chile): Late Triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the Early Jurassic
title_sort mejillonia suspect terrane (northern chile): late triassic fast burial and metamorphism of sediments in a magmatic arc environment extending into the early jurassic
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/128410
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