FN Archimer Export Format
PT J
TI A "high He-4/He-3" mantle material detected under the East Pacific Rise (15 degrees 4 ' N)
BT 
AF MOUGEL, Berengere
   MOREIRA, Manuel
   AGRANIER, Arnaud
AS 1:1,2;2:1;3:2;
FF 1:;2:;3:;
C1 Inst Phys Globe Paris, Sorbonne Paris Cite, CNRS, UMR, Paris, France.
   IUEM, Lab Domaines Ocean, UMR6538, Plouzane, France.
C2 IPGP, FRANCE
   UBO, FRANCE
UM LGO
IF 4.212
TC 9
UR https://archimer.ifremer.fr/doc/00639/75140/75500.pdf
LA English
DT Article
CR PARISUB
BO L'Atalante
DE ;helium;isotopes;mantle geochemistry;MORB;hot spot;EPR
AB We investigate in details helium isotope data reported in Mougel et al. (2014) for 14 basaltic samples collected on the East Pacific Rise by submersible (15 degrees 4N) where the ridge interacts with the Mathematician seamounts. Samples locations are separated by only few hundred meters across a 15km along-axis profile. The data reveal a strong geochemical variability that has never been observed at such high spatial resolution for helium isotope compositions. Moreover, they reveal an unusually high He-4/He-3 mantle component also characterized by unradiogenic lead, atypical in oceanic basalts. He-Pb systematics suggests a mixture between a nonradiogenic lead and radiogenic helium pyroxenitic component, recycled from the deep continental lithosphere and the ambient peridotitic mantle. The He isotope difference between these two end-members can be interpreted as a time evolution of two distinct mantle sources after a slight (U+Th)/He-3 fractionation, likely due to some ancient degassing during the formation of deep continental pyroxenites. 
PY 2015
PD MAR
SO Geophysical Research Letters
SN 0094-8276
PU Amer Geophysical Union
VL 42
IS 5
UT 000351847600014
BP 1375
EP 1383
DI 10.1002/2014GL062921
ID 75140
ER

EF