Circones detriticos del Triasico tardio en metaturbiditas del Complejo Metamorfico Chonos, sur de Chile.
Late Triassic detrital zircons in meta-turbidites of the ChonosMetamorphic Complex, southern Chile
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Herve, Francisco | |
| dc.creator | Fanning, C. Mark | |
| dc.date | 2010-06-30 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V28n1-a05 | |
| dc.identifier | 10.5027/andgeoV28n1-a05 | |
| dc.description | Las edades U-Pb de circones detriticos, obtenidas con el SHRIMP en metareniscas del Complejo Metamorfico de Chonos, revelan una abundante poblacion de circones con edades correspondientes al Triasico Superior. Una de las muestras proviene del estrato que se ubica inmediatamente bajo la capa coquinacea con fosiles que inicialmente otros autores asignaron al Silurico Superior-Devonico Inferior, y recientemente al Triasico Superior. Las edades de circones detriticos concuerdan totalmente con esta ultima, y eliminan la posibilidad de una edad paleozoica de deposicion de las rocas fosiliferas. Otras dos muestras, una de las cuales proviene de las vecindades de un estrato que contiene Lima sp., dan resultados similares, lo que indica que esta edad de deposicion tiene amplia distribucion en la franja oriental del Complejo Metamorfico de los Chonos. En cambio, en una cuarta muestra la edad mas joven de circones detriticos es carbonifera. La construccion del prisma de acrecion estaba activa en el Triasico Superior, y su metamorfismo tuvo lugar, probablemente, durante el Jurasico, contrariamente a la edad paleozoica superior que se le asignaba hasta ahora. | es-ES |
| dc.description | Sensitive High Resolution Ion MicroProbe (SHRIMP) U-Pb age determinations of detrital zircons from metasandstones of the Chonos Metamorphic Complex reveal a significant population of Late Triassic ages. One of the samples is immediately underlying the coquinaceous bed containing fossils which were initially identified as Late Silurian-Early Devonian, and more recently as Late Triassic faunas. The zircon data confirm the latter age as the depositional age of the fossil bearing rocks, excluding completely the possibility of a Paleozoic depositional age. Similar U-Pb detrital zircon ages are recorded in two other samples, one of which was collected in the vicinity of strata containing Lima sp., confirming that a Late Triassic depositional age is widespread in the Eastern belt of the Chonos Metamorphic Complex. However, in a fourth sample, the youngest detrital zircons are Carboniferous in age. Construction of the accretionary prism was thus active in the Late Triassic, and its metamorphism probably took place during the Jurassic, in contrast with a previously accepted Late Paleozoic age. | 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/V28n1-a05/719 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V28n1-a05/html | |
| dc.source | Andean Geology; Vol 28, No 1 (2001); 91-104 | es-ES |
| dc.source | Andean Geology; Vol 28, No 1 (2001); 91-104 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Circones detriticos del Triasico tardio en metaturbiditas del Complejo Metamorfico Chonos, sur de Chile. | es-ES |
| dc.title | Late Triassic detrital zircons in meta-turbidites of the ChonosMetamorphic Complex, southern Chile | 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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