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Cretaceous dykes discovered in the Falkland Islands : implications for regional tectonics in the South Atlantic

Stone, P.; Richards, P.C.; Kimbell, G.S.; Esser, R.P.; Reeves, D.. 2008 Cretaceous dykes discovered in the Falkland Islands : implications for regional tectonics in the South Atlantic. Journal of the Geological Society, 165 (1). 1-4. 10.1144/0016-76492007-072

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Abstract/Summary

New aeromagnetic data resolve the dykes of the Falkland Islands into three swarms. A hitherto unrecognized suite of north–south dykes is established as early Cretaceous by an Ar–Ar date of about 121 Ma. Swarms of NE–SW and east–west dykes are both early Jurassic: the former gives an Ar–Ar age of about 178 Ma, whereas the latter has been previously dated to about 190 Ma. The intrusion of the Cretaceous dykes marks the onset of oceanic crust generation in the South Atlantic and so restricts to mid-Jurassic the microplate rotation envisaged in most models for the Falklands break-out from Gondwana.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1144/0016-76492007-072
Programmes: BGS Programmes 2008 > Marine Geoscience
ISSN: 0016-7649
Date made live: 09 Nov 2011 13:36
URI: http://nora.nerc.ac.uk/id/eprint/15800

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