Modelled palaeolatitudes for the Louisville hot spot and the Ontong Java Plateau
Published:January 01, 2004
Maria Antretter, Peter Riisager, Stuart Hall, Xixi Zhao, Bernhard Steinberger, 2004. "Modelled palaeolatitudes for the Louisville hot spot and the Ontong Java Plateau", Origin and Evolution of the Ontong Java Plateau, J. Godfrey Fitton, John J. Mahoney, Paul J. Wallace, Andrew D. Saunders
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Formation of the Ontong Java Plateau (OJP), a large igneous province in the western Pacific, has been attributed to a rising plume head in the initial stage of the Louisville hot spot, approximately 120–125 Ma ago. However, the Neal et al. plate reconstruction suggests that the plateau formed approximately 9° north of the current location of this hot spot at 51°S. The magnetization of the plateau’s basement records a palaeolatitude of approximately 25°S which further increases the discrepancy with the plume-head model. Modelling the motion of the Louisville hot spot for the last 120 Ma yields a possible southward motion of up to about 6°. True polar wander (TPW) models also shift the predicted palaeolatitudes of the plateau farther north. Taking into account both hot-spot motion and TPW, formation of the OJP by the Louisville not spot remains a possibility.
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Origin and Evolution of the Ontong Java Plateau
The Cretaceous submarine Ontong Java Plateau, in the western Pacific Ocean, is the most volumnous of the world’s large igneous provinces (LIPs), and represents the largest known magmatic event on Earth. LIPs are the products of basaltic volcanism on a scale and at an effusion rate not seen on Earth at the present time, and their formation may have had significant effects on the Earth's climate and biosphere. The currently favoured explanation for LIP formation is the rapid decompression and melting of anomalously hot mantle in the heads of newly ascended mantle plumes. This volume summarizes the results of research aimed principally at testing the plume-head hypothesis for the formation of the Ontong Java Plateau, and presents the results of integrated studies following recent basement drilling on the plateau by the Ocean Drilling Program. Nineteen papers cover topics as diverse as petrology, geochemistry, tectonics, volcanology, paleomagnatism and biostratigraphy.