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Geology reviewed for the Falkland Islands and their offshore sedimentary basins, South Atlantic Ocean

Published online by Cambridge University Press:  16 June 2016

Philip Stone
Philip Stone*
Affiliation:
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK. E-mail: psto@bgs.ac.uk
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Abstract

The position of the Falkland Islands adjacent to the South American continental margin belies the close association of their geology with that of South Africa. A Mesoproterozoic basement is unconformably overlain by a Silurian to Devonian succession of fluvial to neritic and shallow marine, siliciclastic strata. This is disconformably succeeded by a largely Permian succession that, near its base, includes a glacigenic diamictite and, thence, passes upwards into a succession of deltaic and lacustrine strata. The lithological succession and the character of its deformation bear striking similarities to the Cape Fold Belt and Karoo retroarc foreland basin. Swarms of Early Jurassic dykes were coeval with the Karoo magmatism and the initial break-up of Gondwana; Early Cretaceous dykes were intruded during the opening of the South Atlantic Ocean. Offshore sedimentary basins surrounding the archipelago contain Late Jurassic to Palaeogene successions and are currently the focus of hydrocarbon exploration. Best known is the North Falkland Basin, a classic failed rift. To the SE, the passive margin, Falkland Plateau Basin may also be rift-controlled, whilst the South Falkland Basin is a foreland basin created at the boundary of the South American and Scotia plates. The role of the Falkland Islands during the breakup of Gondwana remains controversial. Compelling evidence from the onshore geology favours rotation of an independent microplate from an original position adjacent to the Eastern Cape, South Africa. Alternative interpretations, justified largely from offshore geology, favour extension of the Falkland Plateau as a fixed promontory from the South American margin.

Keywords

Cape Fold BeltFalkland Plateauforeland basinGondwanaKaroomicroplate rotationpalaeomagnetism
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 106 , Issue 2 , June 2015 , pp. 115 - 143
Copyright
© 2016 British Geological Survey (NERC). 

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