The significance of mid-Palaeozoic basement in Graham Land, Antarctic Peninsula

A mid-Palaeozoic basement to the Antarctic Peninsula is confirmed by a geochronological study of the gneissose country rock of the Mesozoic magmatic arc of eastern Graham Land. Rb–Sr whole-rock ages of 410 ± 15 and 426 ± 12 Ma from samples of orthogneiss indicate a previously unrecognized episode of...

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Bibliographic Details
Published in:Journal of the Geological Society
Main Authors: Milne, A.J., Millar, I.L.
Format: Article in Journal/Newspaper
Language:unknown
Published: Geological Society of London 1989
Subjects:
Earth Sciences
Antarctic
The Antarctic
Antarctic Peninsula
Graham Land
Antarc*
Online Access:http://nora.nerc.ac.uk/id/eprint/521266/
https://doi.org/10.1144/gsjgs.146.2.0207
Description
Summary:A mid-Palaeozoic basement to the Antarctic Peninsula is confirmed by a geochronological study of the gneissose country rock of the Mesozoic magmatic arc of eastern Graham Land. Rb–Sr whole-rock ages of 410 ± 15 and 426 ± 12 Ma from samples of orthogneiss indicate a previously unrecognized episode of granitic magmatism in the Antarctic Peninsula during the Silurian. Sm–Nd data on garnet–whole-rock pairs indicate that subsequent amphibolite facies metamorphism occurred in late Carboniferous times, probably as a result of plutonism.

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