Muestra métricas de impacto externas asociadas a la publicación. Para mayor detalle:
| Indexado |
|
||||
| DOI | 10.1016/J.EARSCIREV.2015.11.009 | ||||
| Año | 2016 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Supposed pre-Mesozoic igneous and metamorphic rocks from northern Chile are reviewed in the light of twenty-one new SHRIMP U-Pb zircon age determinations. Metamorphic rocks from the precordillera upthrust belt mostly show a wide spectrum of zircon ages, indicating derivation from sedimentary protoliths. Youngest detrital zircon ages (i.e., maximum depositional ages) range from c. 850 Ma at Belen to 1000-1100 Ma in Sierra de Moreno and Cordon de Lila. Late Proterozoic provenance throughout the region corresponds to a c.1 Ga igneous and metamorphic event. The main source region could have been the Proterozoic MARA block or Laurentia to the west. Early Ordovician plutonic rocks (465-485 Ma) correlated with the Famatinian magmatism of NW Argentina are recognised in all three outcrop areas, and contemporaneous volcanic rocks in Cordon de Lila. Hf- and O-isotope data for Ordovician zircon in these rocks, and for c. 1450 detrital zircon in the metasedimentary rocks, are consistent with ultimate derivation from Early Mesoproterozoic to Paleoproterozoic lithosphere. A depositional age younger than 400 Ma is determined for the Quebrada Aroma metamorphic complex, indicating post-Early Silurian metamorphism and folding. Carboniferous igneous and deformational events occur in the Coast Range, where metasedimentary complexes are mostly related to Late Paleozoic subduction-accretion; deformation and metamorphism continued near the present Pacific shore line until Triassic and earliest Jurassic times. The underlying crust of much of Norte Grande is considered to be Proterozoic (Arequipa-Antofalla block or MARA), although there are no igneous rock outcrops of this age. (C) 2015 Elsevier B.V. All rights reserved.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Pankhurst, Robert J. | Hombre |
British Geol Survey - Reino Unido
British Geological Survey - Reino Unido |
| 2 | HERVE-ALLAMAND, FRANCISCO ENRIQUE ISIDORO | Hombre |
Universidad de Chile - Chile
Universidad Nacional Andrés Bello - Chile |
| 3 | Fanning, C. Mark | Hombre |
Australian Natl Univ - Australia
Australian National University - Australia The Australian National University - Australia |
| 4 | CALDERON-NETTLE, MAURICIO ROBERTO | Hombre |
Universidad de Chile - Chile
Universidad Nacional Andrés Bello - Chile |
| 5 | NIEMEYER-RUBILAR, HANS WOLFGANG | Hombre |
Universidad Católica del Norte - Chile
|
| 6 | Griem-Klee, Susanne | Mujer |
Universidad de Atacama - Chile
|
| 7 | SOTO-VERDUGO, MARIA FERNANDA | Mujer |
Universidad de Chile - Chile
|
| Fuente |
|---|
| FONDECYT |
| Fondo Nacional de Desarrollo Científico y Tecnológico |
| Fondo Nacional de Desarrollo CientÃfico y Tecnológico |
| Agradecimiento |
|---|
| This research has been supported by FONDECYT grants 1095099 and 1130227 and associated International Cooperation Grants. Juan Vargas, Geology Department, Universidad de Chile, separated the zircons that were analysed. F. Munizaga and V. Maksaev, Universidad de Chile, contributed initial analyses of two zircon samples in the Sao Paulo University SHRIMP. Cesar Casquet and Gerhard Worner are thanked for perceptive and helpful reviews. |
| This research has been supported by FONDECYT grants 1095099 and 1130227 and associated International Cooperation Grants. Juan Vargas, Geology Department, Universidad de Chile, separated the zircons that were analysed. F. Munizaga and V. Maksaev, Universidad de Chile, contributed initial analyses of two zircon samples in the Sao Paulo University SHRIMP. Cesar Casquet and Gerhard Wörner are thanked for perceptive and helpful reviews. |