FN Archimer Export Format
PT J
TI The isotopic (He, Ne, Sr, Nd, Hf, Pb) signature in the Indian Mantle over 8.8 Ma
BT 
AF Paquet, Marine
   Hamelin, Cédric
   Moreira, Manuel
   Cannat, Mathilde
AS 1:1;2:2;3:3;4:1;
FF 1:;2:;3:;4:;
C1 Equipe de Géosciences Marines, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR7154 CNRS, 1, rue Jussieu, 75238 Paris cedex 05, France
   Earth Science department, University of Bergen, Allegaten 41, 5007 Bergen, Norway
   Observatoire des Sciences de l'Univers, Université d'Orléans, UMS3116, 1A, rue de la Férollerie, CS 20066, 45071 Orléans cedex 2, France
C2 IPGP, FRANCE
   UNIV BERGEN, NORWAY
   UNIV ORLEANS, FRANCE
IF 4.015
TC 2
UR https://archimer.ifremer.fr/doc/00633/74525/74360.jpg
   https://archimer.ifremer.fr/doc/00633/74525/74361.xlsx
   https://archimer.ifremer.fr/doc/00633/74525/74362.xlsx
   https://archimer.ifremer.fr/doc/00633/74525/74492.pdf
LA English
DT Article
CR EDUL-MD107
   MD 183 / SMOOTHSEAFLOOR
BO Marion Dufresne
DE ;Mid-Ocean Ridge Basalts;Mantle heterogeneity;Noble gases;Isotope geochemistry;Melt/mantle interactions
AB The eastern Southwest Indian Ridge, between 61° and 67°E, has a very low melt supply and comprises several corridors of nearly amagmatic spreading that expose mantle-derived serpentinized peridotite. More volcanically active ridge portions separate these corridors. He, Ne, Pb, Nd, Hf and Sr isotopes were analyzed in basalt glasses dredged on two types of seafloor: volcanic and ultramafic. Basalts dredged in ultramafic seafloor on-axis tend to be slightly more depleted for heavy radiogenic isotopes and show slightly higher 3He/4He isotope ratios than basalts dredged in volcanic seafloor, with no systematic difference in neon isotope ratios. We propose that both types of basalts are derived from the same mantle source, but that the basalts dredged on ultramafic seafloor are more affected by melt/mantle reactions, which slightly modify their isotopic signatures. Our dataset also includes a few basalts, dredged on off-axis ultramafic seafloor, that range in age between 2.6 and 8.8 Ma. These few and widely-spaced off-axis samples, erupted at the ridge axis, are a rare opportunity to capture the potential geochemical variability of the mantle source in an ultramafic seafloor corridor over 8.8 Ma. This temporal variability appears to be minor compared to the overall range of isotopic variability of the on-axis lavas from the 61°-67°E region. 
PY 2020
PD SEP
SO Chemical Geology
SN 0009-2541
PU Elsevier BV
VL 550
UT 000562696500004
DI 10.1016/j.chemgeo.2020.119741
ID 74525
ER

EF