40Ar/39Ar and U-Pb SHRIMP dating of Aptian tuff cones in the Aisén Basin, Central Patagonian Cordillera

M. Suárez, A. Demant, R. De La Cruz, C. M. Fanning

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Surtseyan tuff cones of the Baño Nuevo Volcanic Complex erupted in shallow marine water during the waning stage of the Aisén Basin, the northern part of the Austral Basin of the Central Patagonian Cordillera. This volcanic complex was emplaced within the Hauterivian to early Aptian Apeleg Formation, the youngest sedimentary unit of this basin, whilst the sediments were still wet. Three new Ar/Ar dates (amphibole) and one U-Pb SHRIMP date (zircon) from this complex yielded concordant early Aptian ages of 122-121. Ma. These data agree with the contact relationships between the Apeleg Formation and the tuff cones. These dates also agree with those of early Aptian ammonites collected from the Apeleg Formation 100. km south of the study area, which represent the youngest fossils identified in this unit. Aptian to Albian subaerial volcanic rocks of the Divisadero Group, paraconformably overlie the Apeleg Formation. The emplacement of the Baño Nuevo Volcanic Complex pre-dates the disappearance of the Aisén Basin.

Original languageEnglish
Pages (from-to)731-737
Number of pages7
JournalJournal of South American Earth Sciences
Volume29
Issue number3
DOIs
Publication statusPublished - Apr 2010

Keywords

  • Aisén Basin
  • Aptian
  • Ar/Ar
  • Central Patagonia
  • Chile
  • Shrimp

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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