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Docta Complutense
Doctoral thesis . 2016
Data sources: Docta Complutense
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The Eclogitic Gneisses of the Cabo Ortegal Complex: provenance and tectonothermal evolution (zircon U-Pb/ Lu-Hf methods)

Los Gneises Eclogíticos del Complejo de Cabo Ortegal: procedencia y evolución tectonotermal (métodos U-Pb /Lu-Hf en circón)
Authors: Roper, Richard Albert;

The Eclogitic Gneisses of the Cabo Ortegal Complex: provenance and tectonothermal evolution (zircon U-Pb/ Lu-Hf methods)

Abstract

[ES] El cinturón Varisco se formó cuando varios continentes interactuaron para acabar formando el supercontinente de Pangea. La tesis que aquí se presenta se enmarca en este contexto general de interacción continental y desarrollo orogénico. El principal objetivo es explorar la formación, las fuentes y el desarrollo de un terreno metamórfico de alto grado involucrado en la orogénesis Varisca. En esta tesis se hace especial hincapié en los Gneises Eclogíticos (Gneises Bandeados), los cuales están incluidos en el miembro de alta presión y alta temperatura (HP–HT) del Alóctono Superior del Complejo de Cabo Ortegal (NO de Iberia). También se aborda el estudio de otros miembros del Alóctono Superior, como la banda principal de eclogitas y los Gneises de Cariño, con el fin de tener más herramientas para abordar la evolución tectonotermal general. Para cumplir con los objetivos de esta tesis se han aplicado varios métodos. El primer grupo de métodos tenían por objetivo reconocer y describir el objeto de estudio, desde un punto de vista macroscópico (cartografía y representación detallada de secciones geológicas) hasta un punto de vista microscópico (observación y descripción de láminas delgadas). Una vez terminado el reconocimiento de las diferentes litologías y de la revisión bibliográfica pertinente, se llevaron a cabo determinaciones isotópicas detalladas. Se aplicaron métodos isotópicos U–Pb, Lu–Hf y Sm–Nd en las formaciones estudiadas para conocer las áreas fuente de los materiales detríticos, las edades de cristalización, las fuentes ígneas primigenias y la edad y las condiciones del metamorfismo de alto grado desarrollado en las rocas ígneas estudiadas...

[EN] The Variscan belt was formed when several continents interacted to finally form the supercontinent of Pangea. In this general context of continent interaction and orogen development this PhD was projected and is presented in this document. The main objective of this thesis is to explore the origin, the sources and the development of a high-grade metamorphic terrane involved in this orogenesis. This PhD focuses on the Eclogitic Gneisses (Banded Gneisses), which are included in the high-pressure and high-temperature (HP–HT) member of the Upper Allochthon of the Cabo Ortegal Complex (NW Iberia), and also deals with the Eclogite band and the Cariño Gneisses, so that the general tectonothermal evolution is better accounted for. To address the objectives of this thesis, several methods have been applied. The first group of methods had the aim of recognising and describing the subject of study, from a macroscopic point of view (cartography and detailed representation of geological sections) to a microscopic level (thin section observation and description). When this recognition was carried out and the scientific literature was handled, detailed isotopic experiments were performed. U–Pb, Lu–Hf and Sm–Nd radiogenic methods were applied to make provenance approaches of the detrital materials, to constrain the age of rock formation, the primary sources of magmatic generation and the age and features of the high-grade metamorphic development of the igneous rocks of the studied units...

Tesis llevada a cabo para conseguir el grado de Doctor por la Universidad Complutense de Madrid.--2016-01-28.--Sobresaliente cum laude

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Spain
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Keywords

Metamorphism, 2503 Geoquímica, 552.42(460.11)(043.2), Geology, Metamorfismo, Tectónica, Structural, orogeny, Geoquímica, tectónica, orogenia, Orogenia, Orogeny

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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