A fission track thermochronological study of King George and Livingston islands, South Shetland Islands (West Antarctica)
作者： I. SELL , G. POUPEAU , J.M. GONZÁLEZ-CASADO , J. LÓPEZ-MARTÍNEZ
DOI: 10.1017/S0954102004001907
关键词: Fission track dating 、 Archipelago 、 Thermochronology 、 Oceanography 、 Geology 、 Peninsula 、 Paleontology 、 Structural basin 、 Cenozoic 、 Island arc 、 Shetland
摘要: This paper reports the dating of apatite fission tracks in eleven rock samples from South Shetland Archipelago, an island arc located to north-west Antarctic Peninsula. Apatites Livingston Island were dated as belonging Oligocene (25.8 Ma: metasediments, Miers Bluff Formation, Hurd Peninsula) through Miocene (18.8 tonalites, Barnard Point). Those King George slightly older, Early (32.5 granodiorites, Barton Peninsula). Towards back-arc basin (Bransfield Basin), appears be younger. allows opening rate approximately 1.1 km Ma -1 (during Miocene-Oligocene interval) calculated for Bransfield Basin. Optimization data suggests cooling 100 ± 10oC was coeval with end main magmatic event Arc (Oligocene), and indicates different tectonic- exhumation histories tectonic blocks.
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