Universität zu Köln

Jansen, Mike W., Tusch, Jonas, Muenker, Carsten, Bragagni, Alessandro, Avanzinelli, Riccardo, Mastroianni, Filippo ORCID: 0000-0002-3707-309X, Stuart, Finlay M. and Kurzweil, Florian ORCID: 0000-0002-8202-1475 (2022). Upper mantle control on the W isotope record of shallow level plume and intraplate volcanic settings. Earth Planet. Sci. Lett., 585. AMSTERDAM: ELSEVIER. ISSN 1385-013X

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Abstract

Several studies have revealed small heterogeneities in the relative abundance of 182W, the radiogenic nuclide of short-lived 182Hf (t1/2 = similar to 9 Ma), in terrestrial rocks. Whereas the majority of Archean rocks display 182W excesses relative to bulk silicate Earth, many young ocean island basalts show small 182W deficits, in particular if they are sourced from deep-rooted mantle plumes. The origin of this anomaly is still ambiguous, proposed models focus on core-mantle interaction or the presence of reservoirs in the lower mantle that have been isolated since the Hadean. In order to evaluate the role of upper mantle reservoirs, we report the first 182W data for intraplate basalts where a deep plume origin is still debated (Ascension Island, Massif Central, Siebengebirge and Eifel) and intraplate volcanic rocks associated with either plume or subduction zone environments (Italian Magmatic Provinces) and compare them to new data for basalts that have a deep mantle plume origin (La Reunion and Baffin Island). The proto-Iceland plume basalts from Baffin Island have uniform and modern mantle-like mu 182W of around 0 despite extremely high (3He/4He). In contrast, basalts from both volcanic edifices from La Reunion span a range from modern upper mantle values to deficits as low as mu 182W = -8.8 ppm, indicating a heterogeneous source reservoir. The mu 182W in all other intraplate volcanic provinces overlap the composition of modern upper mantle to within 3 ppm. The absence of resolvable 182W anomalies in these intraplate basalts, which partially tap the lithospheric mantle, suggests that primordial components are neither present in the central and southern European lithosphere nor in the European asthenospheric reservoir (EAR). The general absence of 182W anomalies in European plume-related basalts can either be explained by a shallow mantle source or by the absence of isotopically anomalous and isolated domains in the deep mantle beneath the northern hemisphere, as also suggested by geophysical evidence. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jansen, Mike W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tusch, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Bragagni, Alessandro UNSPECIFIED UNSPECIFIED UNSPECIFIED Avanzinelli, Riccardo UNSPECIFIED UNSPECIFIED UNSPECIFIED Mastroianni, Filippo UNSPECIFIED orcid.org/0000-0002-3707-309X UNSPECIFIED Stuart, Finlay M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurzweil, Florian UNSPECIFIED orcid.org/0000-0002-8202-1475 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-670976
DOI:	10.1016/j.epsl.2022.117507
Journal or Publication Title:	Earth Planet. Sci. Lett.
Volume:	585
Date:	2022
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1385-013X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MID-ATLANTIC RIDGE; SILICATE DIFFERENTIATION; GEOCHEMICAL EVIDENCE; CONTINENTAL-CRUST; EARTHS MANTLE; INDIAN-OCEAN; TUNGSTEN; BASALTS; BENEATH; W-182 Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67097