Edades u-pb shrimp del cenozoico medio en circones detríticos de rocas metasedimentarias en los andes Norpatagónicos de Aysén, Chile

Translated title of the contribution: Mid-cenozoic shrimp u-pb detrital zircon ages from metasedimentary rocks in the north Patagonian andes of Aysén, Chile

Paulo Quezada, Francisco Hervé, Mauricio Calderón, Mark Fanning, Robert Pankhurst, Estanislao Godoy, Octavio Urbina, Rodrigo Suárez

Research output: Contribution to journalArticlepeer-review

Abstract

Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44°30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén Formation; previous correlation with the Paleozoic metamorphic basement of this sector of the North Patagonian Andes is thus refuted. A similar age and provenance were obtained for a paraconglomerate bed of the La Junta Formation ca. 80 km to the north, which is thought to represent a high-energy lateral facies variation of the Traiguén Formation. Miocene plutonic rocks of the North Patagonian Batholith intruded these metasedimentary rocks, generating a contact metamorphic aureole that reaches biotite grade and overprints a previous metamorphic fabric probably formed during closure of the Traiguén Basin. Similar young ages for metamorphic rocks located immediately west of the Liquiñe-Ofqui Fault Zone 300 km north, near Ayacara, suggest a regional pattern of earliest Neogene metamorphism and rapid exhumation in this segment of the Patagonian Andes.

Translated title of the contributionMid-cenozoic shrimp u-pb detrital zircon ages from metasedimentary rocks in the north Patagonian andes of Aysén, Chile
Original languageSpanish
Pages (from-to)54-74
Number of pages21
JournalAndean Geology
Volume48
Issue number1
DOIs
Publication statusPublished - Jan 2021

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

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