Upper Cretaceous intrusives in the Coastal Cordillera near Valdivia: forearc magmatism related to the passage of a triple junction?
Intrusivos Cretácico Superior en la Cordillera de la Costa del área de Valdivia: magmatismo de antearco relacionado al paso de un punto triple?
| dc.contributor | Universidad de Concepción, SERNAGEOMIN | en-US |
| dc.contributor | es-ES | |
| dc.creator | de la Fuente, Denisse | |
| dc.creator | Figueroa, Óscar | |
| dc.creator | Demaiffe, Daniel | |
| dc.creator | Mella, Mauricio | |
| dc.creator | Duhart, Paul | |
| dc.creator | Quiroz, David | |
| dc.creator | Muñoz, Jorge | |
| dc.creator | Oliveros, Verónica | |
| dc.date | 2021-01-29 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V48n1-3062 | |
| dc.identifier | 10.5027/andgeoV48n1-3062 | |
| dc.description | Upper Cretaceous intrusives of limited extent crop out in the Coastal Cordillera near of Valdivia (39º48’ S), 100 km west of the main topographic divide of the Andean Cordillera. Given that plutonic rocks of the same age crop out at the same latitudes in the high Andes the coastal intrusives emplaced in a forearc position in the upper plate of a subduction setting. They correspond to hypabyssal intrusives displaying mainly porphyritic texture and lithological variations with microtonalites (minor), porphyritic microgranodiorites (main) and microgranites. They intrude the Upper Paleozoic-Triassic accretionary complex of the Bahia Mansa Metamorphic Complex. These intrusives, that comprise the Chaihuín Pluton and minor stocks of porphyritic felsic rocks, have calc-alkaline affinities with metaluminous and peraluminous character. They are geochemically similar to the contemporaneous main arc-related plutonic rocks of the Gualletué Plutonic Group. The microgranitoids and dacitic rocks from Los Boldos, the low and Loncoche are peculiar because they show an apparently adakitic affinity in Sr/Y and LaN/YbN discriminant diagrams; nevertheless Sr contents of these rocks ( | en-US |
| dc.description | En la costa cerca de Valdivia (39º48’ S) afloran intrusivos del Cretácico Superior de limitada extensión. En consideración a que a la misma latitud en la Cordillera de Los Andes hay rocas plutónicas de la misma edad emplazadas en un ambiente de arco magmático, estos intrusivos de la costa se disponen en un ambiente tectónico de antearco. Ellos corresponden a intrusivos someros, de textura principalmente porfídica y que varían de microtonalitas (escasas) a microgranodioritas porfídicas (mayor ocurrencia) y a microgranitos. Ellos intruyen a las rocas del prisma acrecionario Paleozoico superior-Triásico agrupadas en el Complejo Metamórfico Bahía Mansa. De norte a sur, los intrusivos estudiados corresponden a: Granitoide Los Boldos, Pórfido dacítico Loncoche, Pórfido Oncol, Pórfido dacítico Laurel y Plutón Chaihuín. Este último es el de mayor extensión (24 km) y de mayor variación composicional (tonalita a granito). Estos intrusivos tienen una afinidad calcoalcalina, con un carácter metaluminoso a peraluminoso. Desde el punto de vista geoquímico, son similares a las rocas contemporáneas del arco principal, representado por el Grupo Plutónico Gualletué (38º45’ S, 72º30’ W). Los intrusivos de Los Boldos y Loncoche son particulares ya que presentan una afinidad aparentamente adakítica en los diagramas discriminantes Sr/Y y LaN/YbN.; sin embargo, los bajos contenidos en Sr de estas rocas ( | es-ES |
| dc.format | application/pdf | |
| dc.format | text/html | |
| dc.language | eng | |
| dc.publisher | Servicio Nacional de Geología y Minería | en-US |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V48n1-3062/pdf | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V48n1-3062/html | |
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| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2290 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2291 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2292 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2293 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2294 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2295 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2296 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2297 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2298 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/downloadSuppFile/V48n1-3062/2299 | |
| dc.rights | Copyright (c) 2021 Andean Geology | en-US |
| dc.source | Andean Geology; Vol 48, No 1 (2021); 24-53 | es-ES |
| dc.source | Andean Geology; Vol 48, No 1 (2021); 24-53 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.subject | Valdivia; Forearc Intrusives; Petrography and Geochemistry; Isotopes; Ridge Subduction | en-US |
| dc.subject | Valdivia; Intrusivos de Antearco; Petrografía y Geoquímica; Isótopos; Subducción de Dorsal | es-ES |
| dc.title | Upper Cretaceous intrusives in the Coastal Cordillera near Valdivia: forearc magmatism related to the passage of a triple junction? | en-US |
| dc.title | Intrusivos Cretácico Superior en la Cordillera de la Costa del área de Valdivia: magmatismo de antearco relacionado al paso de un punto triple? | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
This item appears in the following Collection(s)
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Andean Geology
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