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A fission track thermochronological study of King George and Livingston islands, South Shetland Islands (West Antarctica)

  • I. SELL (a1) (a2), G. POUPEAU (a2), J.M. GONZÁLEZ-CASADO (a1) and J. LÓPEZ-MARTÍNEZ (a1)

Abstract

This paper reports the dating of apatite fission tracks in eleven rock samples from the South Shetland Archipelago, an island arc located to the north-west of the Antarctic Peninsula. Apatites from Livingston Island were dated as belonging to the Oligocene (25.8 Ma: metasediments, Miers Bluff Formation, Hurd Peninsula) through to the Miocene (18.8 Ma: tonalites, Barnard Point). Those from King George Island were slightly older, belonging to the Early Oligocene (32.5 Ma: granodiorites, Barton Peninsula). Towards the back-arc basin (Bransfield Basin), the apatite appears to be younger. This allows an opening rate of approximately 1.1 km Ma−1 (during the Miocene–Oligocene interval) to be calculated for Bransfield Basin. Optimization of the apatite data suggests cooling to 100 ± 10°C was coeval with the end of the main magmatic event in the South Shetland Arc (Oligocene), and indicates slightly different tectonic-exhumation histories for the different tectonic blocks.

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corresponding author: g.casado@uam.es

Keywords

A fission track thermochronological study of King George and Livingston islands, South Shetland Islands (West Antarctica)

  • I. SELL (a1) (a2), G. POUPEAU (a2), J.M. GONZÁLEZ-CASADO (a1) and J. LÓPEZ-MARTÍNEZ (a1)

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