The tectonic evolution of Antarctica

Five tectonic provinces; three volcanic provinces (each characteristic of a particular set of tectonic conditions) and a Precambrian shield, are outlined and described, in an attempt to illustrate the tectonic evolution of Antarctica. Evidence is presented for at least three structural stages in the development of the Precambrian shield, though it is not as yet possible to delineate individual tectonic provinces within the shield area. From the late Proterozoic until the early Mesozoic, a series of tectonic provinces were successively stabilised and accreted onto the Pacific margin of the Precambrian shield. In the Mesozoic however, this unstable margin broke up into a number of blocks, as a result of differential movements between East and west Antarctica, associated with the fragmentation of Gondwanaland. Block tectonics, rifting and the development of faultbounded marginal basins, were accompanied by alkali volcanism in the late Cenozoic. This activity continues at the present. The proposed scheme is also viewed in the wider context of Gondwanaland and plate tectonics. Although the justification for long distance correlation of individual tectonic regions is called into question, four stages are illustrated in the evolution of the present Southern Hemisphere.

Name dc:type.qualificationname

Master of Philosophy (MPhil)

Level dc:type.qualificationlevel

Masters

Grantor dc:publisher.institution

University of Cambridge

Year dc:date.issued

1977

Author dc:creator

• Hamer, Richard Daniel

Licence

• https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/283a82c4-efe8-4c09-936e-5a5c3fce1a98/download
• https://www.rioxx.net/licenses/all-rights-reserved/

Language dc:language

eng

DOI dc:identifier.doi

https://doi.org/10.17863/CAM.42197

OAI identifier oai:identifier

oai:www.repository.cam.ac.uk:1810/295127