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Article
Nature 374, 34-39 (2 March 1995) | doi:10.1038/374034a0; Received 18 March 1994; Accepted 26 January 1995
Seismic and geochemical evidence for large-scale mantle upwelling beneath the eastern Atlantic and western and central Europe
Kaj Hoernle*, †, Yu-Shen Zhang‡ & David Graham§
- *, Earth Sciences Board and Marine Sciences Institute,‡ Institute of Tectonics, University of California, Santa Cruz, California 95064, USA
- § College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA
- † Present address: Department of Volcanology and Petrology, GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany.
Abstract
Seismic tomography and the isotope geochemistry of Cenozoic volcanic rocks suggest the existence of a large, sheet-like region of upwelling in the upper mantle which extends from the eastern Atlantic Ocean to central Europe and the western Mediterranean. A belt of extension and rifting in the latter two areas appears to lie above the intersection of the centre of the upwelling region with the base of the lithosphere. Lead, strontium and neodymium isotope data for all three regions converge on a restricted composition, inferred to be that of the upwelling mantle.
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