Antarctic Peninsula continental magnesian andesites: indicators of ridge-trench interaction during Gondwana break-up
Subduction of young, hot oceanic lithosphere and a major episode of lithospheric extension have been considered as key tectonomagmatic factors in the genesis of ‘Setouchi-type’ continental magnesian andesites. We present data on a new discovery of such andesites from the northern part of the Antarct...
| Published in: | Journal of the Geological Society |
|---|---|
| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
Geological Society of London
1990
|
| Subjects: | |
| Online Access: | http://nora.nerc.ac.uk/id/eprint/520275/ https://doi.org/10.1144/gsjgs.147.4.0595 |
| Summary: | Subduction of young, hot oceanic lithosphere and a major episode of lithospheric extension have been considered as key tectonomagmatic factors in the genesis of ‘Setouchi-type’ continental magnesian andesites. We present data on a new discovery of such andesites from the northern part of the Antarctic Peninsula and propose that subduction of newly created oceanic lithosphere occurred along the proto-Pacific margin of Antarctica during the Middle Jurassic. Continental magnesian andesite magmatism was contemporaneous with the early stages of Gondwana break-up and we suggest that subduction of young, hot oceanic lithosphere and ridge-trench interaction may have contributed to the disintegration of Gondwana by thermally weakening the lithosphere and developing a broad, linear extensional zone along the proto-Pacific margin. |
|---|