FN Archimer Export Format
PT J
TI Atypically depleted upper mantle component revealed by Hf isotopes at Lucky Strike segment
BT 
AF HAMELIN, Cedric
   BEZOS, Antoine
   DOSSO, Laure
   ESCARTIN, Javier
   CANNAT, Mathilde
   MEVEL, Catherine
AS 1:1;2:2;3:3;4:4;5:4;6:4;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Bergen, Ctr Geobiol, N-5007 Bergen, Norway.
   Lab Planetol & Geodynam, F-44322 Nantes 3, France.
   IFREMER, UMR 6538, CNRS, F-29280 Plouzane, France.
   Inst Phys Globe Paris, F-75252 Paris 05, France.
C2 UNIV BERGEN, NORWAY
   UNIV NANTES, FRANCE
   CNRS, FRANCE
   IPGP, FRANCE
IF 3.482
TC 26
TU Centre national de la recherche scientifique
   Institut français de recherche pour l'exploitation de la mer
   Service Hydrographique et Océanographique de la Marine
   Université de Bretagne Occidentale
   Université de Bretagne-Sud
UR https://archimer.ifremer.fr/doc/00129/24047/23572.pdf
LA English
DT Article
CR BATHYLUCK 2009
   MOMAR2008-LEG1
BO Pourquoi pas ?
   L'Atalante
DE ;Oceanic basalts;Mid-Atlantic Ridge;Lucky Strike;Mantle heterogeneity;Hf isotopes
AB The Earth's upper mantle is commonly depicted as a “marble cake” assemblage of a refractory component mingled with varying amounts of geochemically diverse enriched components. This depleted component controls the major element composition of Mid-Oceanic Ridge Basalts (MORBs). It has long been considered a fairly uniform reservoir, depleted by early melting and well homogenized by subsequent convective stirring. We present new Hf, Nd, Pb and Sr isotopes and trace element data for basalts from the center of the Lucky Strike segment of the Mid-Atlantic Ridge (MAR). Despite the limited size of our sampling area (1.6 km along-axis by 5 km across), these data show a large range of isotopic compositions (similar to that of the whole MAR). It has recently been shown that part of the reason for not observingmore segmentswith correlated Hf–Nd isotope systematics may be the lack of fine-scale sampling. Our data confirm this idea and showstrong correlations between all isotope ratios. The systematics of Hf–Nd isotopes in Lucky Strike basalts define an atypical correlation, distinct from the globalmantle array,with an anomalously high εHf for a given εNd.We illustrate that this atypical trend is the signature of an ancient refractory mantle rather than the product of kinetic processes during the melting event. The existence of this mantle component at Lucky Strike allows us to discuss the structure of the upper mantle around the Azores.
PY 2013
PD MAR
SO Chemical Geology
SN 0009-2541
PU Elsevier Science Bv
VL 341
UT 000317163200009
BP 128
EP 139
DI 10.1016/j.chemgeo.2013.01.013
ID 24047
ER

EF