Plate-tectonic model for southern Antarctic Peninsula and its relation to southern Andes

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Abstract

Three main Upper Jurassic-Cretaceous tectono-stratigraphic units recognized in Palmer Land and Alexander Island are comparable with assemblages formed (1) in an ensialic volcanic arc (Upper Jurassic Volcanic Group), (2) in a forearc or intra-arc marine basin (Fossil Bluff Formation), and (3) in a back-arc marine basin (Crabeater Point sediments and Latady Formation), possibly representing a proto-Weddell Sea. A sequence of intensely sheared, polyphasally deformed turbidites and pillow lava rocks of possible late Paleozoic or Triassic age, exposed along western Alexander Island, is tentatively interpreted as a trench assemblage accreted during an early stage of subduction. There is a close correlation between these units and the approximately coeval island-arc-marginal basin system of the southern Andes and South Georgia.

Original languageEnglish
Pages (from-to)211-214
Number of pages4
JournalGeology
Volume4
Issue number4
DOIs
Publication statusPublished - 1976

ASJC Scopus subject areas

  • Geology

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