K-Ar ages of basalt flows of the Meseta Buenos Aires in southern Chile and their relation to the southeast Pacific triple junction.

R. Charrier, E. Linares, H. Niemeyer, J. Skarmeta

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The Meseta Buenos Aires faces the triple junction between the Nazca, Antarctic, and South American plates and consists of two olivine basaltic units separated by two sedimentary units. Seventeen whole-rock K-Ar age determinations give a minimum age of 57 m.y. (late Paleocene) for the lower unit and ages ranging from 16 to 4.4 m.y. (early Miocene to Pliocene) for the upper unit. The Friasian Land Mammal Stage sedimentary unit underlying the upper basaltic unit is assigned to the late Oligocene-early Miocene interval, and the marine sedimentary unit underlying the Friasian deposits and overlying the lower basaltic unit is assigned to the Eocene-early Oligocene interval. The lower basaltic unit rests unconformably on a marine fossiliferous sedimentary unit of probable Late Cretaceous to early Paleocene age. -Authors

Original languageEnglish
Pages (from-to)436-439
Number of pages4
JournalGeology
Volume7
Issue number9
DOIs
Publication statusPublished - 1979

ASJC Scopus subject areas

  • Geology

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