Cuenca de retroarco toarciana en Patagonia central (Chubut), Argentina: cierre, migracion del arco y ambiente tectonico durante el Jurasico Medio.
A Toarcian retro-arc basin of Central Patagonia (Chubut), Argentina: Middle Jurassic closure,arc migration and tectonic setting
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Suarez, Manuel | |
| dc.creator | Marquez, Marcelo | |
| dc.date | 2010-06-23 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V34n1-a04 | |
| dc.identifier | 10.5027/andgeoV34n1-a04 | |
| dc.description | La Cuenca de Chubut (nuevo nombre para la Cuenca Liasica de Chubut Occidental de otros autores), desarrollada durante el Jurasico Inferior en la parte occidental de la region extra-Andina de la Patagonia central, en Argentina (42°30S y 44°30S), acumulo sedimentos continentales y de mar somero, con aporte piroclastico, de la Formacion Osta Arena y unidades equivalentes. Esta cuenca estuvo limitada al oeste por un arco magmatico (Faja Plutonica Subcordillerana) y un complejo de subduccion del Triasico tardio-Jurasico temprano (Complejo Metamorfico Los Chonos). A su vez, la parte oriental del fondo de la cuenca se desarrollo sobre un arco remanente de edad triasica superior-jurasica inferior (Batolito de Patagonia Central) y sobre las sedimentitas neopaleozoicas de un prisma de acrecion. Hacia el este, la cuenca estaba limitada por un sistema volcanico toarciano asociado a la pluma de Karroo (Formacion Marifil). El arco continuaba hacia el norte, donde esta representado por el Miembro Icalma de la Formacion Nacientes del Biobio, que bordeaba por el oeste a la Cuenca de Neuquen. El cierre de la Cuenca de Chubut ocurrio durante el Jurasico Medio y coincide en el tiempo con una brusca migracion al suroeste del arco magmatico toarciano, desde una posicion en la Patagonia central extra-Andina, con una orientacion NNW, a una ubicacion en la Cordillera Patagonica con una orientacion norte-sur. Sincronicamente, se desarrollo volcanismo silicico anatectico asociado a tectonismo extensional al este del arco. En consecuencia, durante el Jurasico Medio hubo un cambio tectonico mayor en la region patagonica. Se propone que la migracion del arco estuvo relacionada con el crecimiento de una pluma bajo Patagonia nororiental. | es-ES |
| dc.description | The Chubut Basin (new name for the Liassic Western Chubut Basin of other authors), developed during the Early Jurassic in the western part of central extra-Andean Patagonia in Argentina (42°30 S and 44°30 S), accumulated shallow marine and continental sedimentary beds, with pyroclastic input, of the Osta Arena Formation and equivalent units. To the west it was bounded by a coeval subduction-related magmatic arc (Subcordilleran Plutonic Belt) and a subduction complex of Late Triassic-Early Jurassic age (Chonos Metamorphic Complex). In turn, the eastern basin floor developed over the remnants of a previous Late Triassic-earliest Jurassic magmatic arc (Batholith of Central Patagonia) and over neopaleozoic sedimentary rocks of an accretionary prism. To the east, the basin was limited by a Toarcian volcanic system associated to the Karroo plume. The western magmatic arc continued to the north, where it is represented by the Icalma Member of the Nacientes del Biobío Formation, bounding this time the Neuquén Basin developed to the east. The closure of the Toarcian basin in the Middle Jurassic coincides in time with a migration to the southwest of the Toarcian magmatic arc, from a position in central extra-Andean Patagonia and a NNW orientation, to a location in the Patagonian Cordillera and a north-south orientation. Synchronously, rift-related anatectic silicic volcanism developed east of the basin. Hence, a major change in tectonic setting took place during the Middle Jurassic. It is here proposed that the migration of the arc was related to the growth of a plume under north-eastern Patagonia. | en-US |
| 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/V34n1-a04/439 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V34n1-a04/html | |
| dc.source | Andean Geology; Vol 34, No 1 (2007); 63-80 | es-ES |
| dc.source | Andean Geology; Vol 34, No 1 (2007); 63-80 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Cuenca de retroarco toarciana en Patagonia central (Chubut), Argentina: cierre, migracion del arco y ambiente tectonico durante el Jurasico Medio. | es-ES |
| dc.title | A Toarcian retro-arc basin of Central Patagonia (Chubut), Argentina: Middle Jurassic closure,arc migration and tectonic setting | en-US |
| 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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