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Journal of the Geological Society; 2002; v. 159; issue.2; p. 117-120;
DOI: 10.1144/0016-764901-128
© 2002 Geological Society of London

Short Communication

Carbonate formations and early NW-directed thrusting in the highest allochthons of the Norwegian Caledonides: evidence of a Laurentian ancestry

D. ROBERTS, V. M. MELEZHIK & T. HELDAL

1 Geological Survey of Norway, N-7491 Trondheim, Norway (e-mail: david.roberts@ngu.no)

tructural, sedimentological and isotope-geochemical investigations on thick, carbonate formations in the Uppermost Allochthon of the Norwegian Caledonides have provided the first direct indications of the Laurentian origins of these shelf and slope/rise successions. Chemostratigraphical ages for marbles mostly range from Vendian to Cambrian. The earliest tectonic deformation, involving NW-vergent thrusts and folds in one of the nappes, is considered to relate to Taconian orogenic development along the margin of Laurentia. Subsequently, during Siluro-Devonian, Baltica–Laurentia collision, these thick successions, and plutonic complexes farther south, were detached from their Laurentian roots and retransported into the higher levels of the Scandian orogenic wedge.


Keywords: Norway, Caledonides, Taconian orogeny, Scandian orogeny, carbonate rocks.




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