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Rare gas systematics in Red Sea Ridge basalts
Author(s) -
Moreira M.,
Valbracht P. J.,
Staudacher Th.,
Allègre C. J.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl02301
Subject(s) - basalt , geology , plume , mantle (geology) , isotopic signature , neon , mantle plume , ridge , geochemistry , isotope , oceanography , paleontology , argon , lithosphere , tectonics , chemistry , physics , organic chemistry , quantum mechanics , thermodynamics
From south to north, the 4 He/³He ratios of submarine basalts from the Red Sea and Gulf of Tadjoura increase from 45,000 (R/Ra=15) in the Gulf of Tadjoura to 84,000 (R/Ra=8.6) in the Mabahiss deep. Our helium isotopic results indicate that the mantle plume proposed in the north of the Red Sea, on the basis of the Sr and Pb isotopic ratios, does not posess a high ³He signature. The neon and Ar isotopic ratios of the Red Sea glasses are explained by mixing between AIR, MORB and a plume with a solar like isotopic Ne signature and low 40 Ar/ 36 Ar, similar to that of Loihi.