Antarctica-New Zealand rifting and Marie Byrd Land lithospheric magmatism linked to ridge subduction and mantle plume activity

Mid-Cretaceous igneous rocks of central Marie Byrd Land, Antarctica record a rapid change from subduction-related to rift-related magmatism. This correlates with the final stages of subduction of the Phoenix plate and the subsequent rifting of New Zealand from West Antarctica, prior to the opening o...

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Bibliographic Details
Main Authors: Weaver, S. D., Storey, B. C., Pankhurst, R. J., Mukasa, S. B., DiVenere, V. J., Bradshaw, J. D.
Format: Article in Journal/Newspaper
Language:unknown
Published: Geological Society of America 1994
Subjects:
Southern Ocean
West Antarctica
New Zealand
Byrd
Marie Byrd Land
Antarc*
Antarctica
Antarctica New Zealand
Online Access:http://nora.nerc.ac.uk/id/eprint/517540/
https://doi.org/10.1130/0091-7613(1994)022<0811:ANZRAM>2.3.CO;2
Description
Summary:Mid-Cretaceous igneous rocks of central Marie Byrd Land, Antarctica record a rapid change from subduction-related to rift-related magmatism. This correlates with the final stages of subduction of the Phoenix plate and the subsequent rifting of New Zealand from West Antarctica, prior to the opening of the Southern Ocean. Rift magmatism produced diverse A-type granitoids and mafic intrusive rocks of continental flood-basalt affinity that were derived ultimately from lithospheric mantle sources. Rifting was caused by changes in plate boundary forces; however, mantle plume activity may have begun in mid-Cretaceous time, triggering melting of the lithosphere and controlling the locus of rifting.

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