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Published on: October 7, 2009
LIP formation and protracted lower mantle upwelling induced by rifting and delamination
Kenni Dinesen Petersen1, Christian Schiffer2, Thorsten Nagel3
1Department of Geoscience, Aarhus University, 8000, Aarhus, Denmark. kenni@geo.au.dk.
Abstract:
Large Igneous Provinces (LIPs) are commonly attributed to mantle plumes, hot upwellings from the deep lower mantle, apparently unrelated to plate motions. However, LIPs often form in association with rifting and breakup. Using numerical modelling, we introduce a novel idea that explains plume-like mantle upwelling by plate tectonic processes. Our model indicates that rifting-induced delamination of orogenic lithosphere can perturb the thermochemical mantle stratification and induce lower mantle upwelling which causes syn-rift LIP formation followed by protracted and enhanced mid ocean ridge basalt (MORB) generation. Our model provides an explanation for the geographical correlation between the Caledonian suture, the North Atlantic Igneous Province (NAIP) and present-day Icelandic magmatism.
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