Project

How do continents grow? The Köli Nappe Complex of the Scandinavian Caledonides as a natural laboratory for continental accretion

Goal: Many studies of continental growth and modification have focused on the major phase of growth in the early history of the Earth, but a major goal of our proposed study is to investigate an important, but hitherto little-recognised example of more recent (Phanerozoic) continental growth by accretion in a subduction-collision system – the Caledonian orogen of Scandinavia. Here, crust generated in arcs, back-arcs, fore-arcs and mid-ocean ridges within the Iapetus Ocean has been accreted to the Baltic craton by a combination of arc collisions and final continental collision with Laurentia. The accreted rocks are now preserved in the Köli Nappe Complex (KNC) in Sweden and Norway.

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Katarzyna Walczak
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Many studies of continental growth and modification have focused on the major phase of growth in the early history of the Earth, but a major goal of our proposed study is to investigate an important, but hitherto little-recognised example of more recent (Phanerozoic) continental growth by accretion in a subduction-collision system – the Caledonian orogen of Scandinavia. Here, crust generated in arcs, back-arcs, fore-arcs and mid-ocean ridges within the Iapetus Ocean has been accreted to the Baltic craton by a combination of arc collisions and final continental collision with Laurentia. The accreted rocks are now preserved in the Köli Nappe Complex (KNC) in Sweden and Norway.