Late Triassic detrital zircons in meta-turbidites of the Chonos Metamorphic Complex, Southern Chile

Francisco Hervé, C. Mark Fanning

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

31 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)91-104
Número de páginas14
PublicaciónRevista Geologica de Chile
Volumen28
N.º1
DOI
EstadoPublicada - 2001

Áreas temáticas de ASJC Scopus

  • Geología

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