Interaction of mantle derived melts with crust during the emplacement of the Voring Plateau, N.E. Atlantic

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doi: 10.1016/j.margeo.2009.02.007
Author(s): Meyer, Romain; Hertogen, Jan; Pedersen, Rolf B.; Viereck-Götte, Lothar; Abratis, Michael
Author Affiliation(s): Primary:
Katholieke Universiteit Leuven, Geo-Instituut, Louvain, Belgium
European Science Foundation, France
Institute of Earth Sciences "Jaume Almera", Spain
Universitetet i Bergen, Norway
Friedrich-Schiller-Universität Jena, Federal Republic of Germany
Volume Title: EUROMARGINS; imaging, monitoring, and modelling the physical, chemical and biological processes in the European passive continental margins
Volume Author(s): Mienert, Juergen, editor; Foucher, Jean-Paul; Hauglustaine, Didier; Ortiga, Manuel Fernandez
Source: EUROMARGINS; imaging, monitoring, and modelling the physical, chemical and biological processes in the European passive continental margins, edited by Juergen Mienert, Jean-Paul Foucher, Didier Hauglustaine and Manuel Fernandez Ortiga. Marine Geology, 261(1-4), p.3-16. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 31 refs.; illus., incl. 6 tables, geol. sketch map
Summary: Trace element and isotopic signatures of magmatic rock samples from ODP Hole 642E at the Voring Plateau provide insight into the interaction processes of mantle melt with crust during the initial magma extrusion phases at the onset of the continental breakup. The intermediate (basaltic-andesitic) to felsic (dacitic and rhyolitic) Lower Series magmas at ODP Hole 642E appear to be produced by large amounts of melting of upper crustal material. This study not only makes use of the traditional geochemical tools to investigate crust-mantle interaction, but also explores the value of Cs geochemistry as an additional tool. The element Cs forms the largest lithophile cation, and shows the largest contrast in concentration between (depleted) mantle and continental crust. As such it is a very sensitive indicator of involvement of crustal material. The Cs data reinforce the conclusion drawn from isotopic signatures that the felsic magmas are largely anatectic crustal melts. The down-hole geochemical variation within ODP Hole 642E defines a decreasing continental crustal influence from the Lower Series into the Upper Series. This is essential information to distinguish intrinsic geochemical properties of the mantle melts from signatures imposed by crustal contamination. A comparison with data from the SE Greenland margin highlights the compositional asymmetry of the crust-mantle interactions at both sides of the paleo-Iapetus suture. While Lower Series and Middle Series rocks from the SE Greenland margin have isotopic signatures reflecting interactions with lower and middle crust, such signatures have not been observed at the mid-Norwegian margin. The geochemical data either point to a dissimilar Caledonian crustal composition and/or to different geodynamic pre-breakup rifting history at the two NE Atlantic margin segments. Abstract Copyright (2009) Elsevier, B.V.
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 18 Geophysics, Solid-Earth; Alkali metals; Alkaline earth metals; Arctic Ocean; Atlantic Ocean; Cesium; Continental crust; Continental drift; Continental margin; Crust; Crustal thinning; EUROMARGINS; Geochemistry; Geodynamics; Isotope ratios; Isotopes; Large igneous provinces; Lead; Lithosphere; Magma contamination; Magmas; Major elements; Mantle; Melting; Metals; Nd-144/Nd-143; Neodymium; North Atlantic; North Atlantic igneous province; Northeast Atlantic; Norwegian Sea; ODP Site 642; Ocean Drilling Program; Passive margins; Pb-206/Pb-204; Pb-207/Pb-204; Pb-207/Pb-206; Pb-208/Pb-204; Plate tectonics; Radioactive isotopes; Rare earths; Rifting; Sr-87/Sr-86; Stable isotopes; Strontium; Theoretical models; Trace elements; Voring Plateau
Coordinates: N671312 N671330 E0025548 E0025542
Record ID: 2009072240
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands