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Journal of the Geological Society; 1997; v. 154; issue.1; p. 9-13;
DOI: 10.1144/gsjgs.154.1.0009
© 1997 Geological Society of London

Article

Tectonic rotation within the British paratectonic Caledonides and Early Palaeozoic location of the orogen

J. D. A. PIPER

Geomagnetism Laboratory, Department of Earth Sciences, University of Liverpool, PO Box 147, Liverpool L69 3BX, UK (e-mail: sg04{at}liverpool.ac.uk)

Magnetizations of Late Ordovician (Caradoc-early Ashgill) age in the paratectonic Caledonides of Wales and the Lake District are directed westerly and northerly respectively. They identify c. 55°) of relative rotation of probable Acadian age. Southward subduction of Iapetus ocean crust occurred in Ordovician times beneath a latitudinally oriented orogen sited in mid-southerly latitudes with the Borrowdale and Snowdonia Volcanic provinces forming parallel fore-arc and back-arc lineaments respectively. Mid-Ordovician to mid-Devonian palaeomagnetic poles from the orogen correlate with contemporaneous Gondwana data to identify a former location sited west of the South American perimeter and not near to North Africa as assumed in previous reconstructions.


Keywords: Caledonides, Lower Palaeozoic, Gondwana, plate tectonics, rotation.




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