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New K-Ar isotopic ages of schists from Nordenskjöld Coast, Antarctic Peninsula: oldest part of the Trinity Peninsula Group?

Smellie, J.L.; Millar, I.L.. 1995 New K-Ar isotopic ages of schists from Nordenskjöld Coast, Antarctic Peninsula: oldest part of the Trinity Peninsula Group? Antarctic Science, 7 (2). 191-196. 10.1017/S0954102095000253

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Abstract/Summary

K-Ar whole-rock dating of five samples of quartz-mica schist from the Nordenskjöld Coast, eastern Graham Land, provides the first unequivocal evidence of pre-Triassic (> 249 ± 7 Ma) deposition of a sequence regarded as part of the Trinity Peninsula Group (TPG). A maximum age range of latest Carboniferous (< c. 300 Ma)–Permian for deposition of the Nordenskjöld Coast sequence is indicated, and a polymetamorphic, polydeformational history for the TPG in northern Graham Land. However, the possibility exists that the rocks dated here from the Nordenskjöld Coast are part of a hitherto-unrecognized metamorphic basement unrelated to and older than the mainly Triassic TPG outcrops farther north. The new ages confirm the existence of a previously poorly-defined regional metamorphic event in the Antarctic Peninsula at about 245–250 Ma ago.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1017/S0954102095000253
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0954-1020
NORA Subject Terms: Earth Sciences
Date made live: 16 Jan 2017 11:38 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/515846

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