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Oceanic lavas sampling the high- (super 3) He/ (super 4) He mantle reservoir; primitive, depleted, or re-enriched?

Gordana Garapic, Ananya Mallik, Rajdeep Dasgupta and Matthew G. Jackson
Oceanic lavas sampling the high- (super 3) He/ (super 4) He mantle reservoir; primitive, depleted, or re-enriched?
American Mineralogist (October 2015) 100 (10): 2066-2081


Helium isotopes are used as a tracer for primitive reservoirs that have persisted in the Earth's mantle. Basalts erupted at several intraplate oceanic islands, including Hawaii, Iceland, Galapagos, and Samoa, have hosted the highest (super 3) He/ (super 4) He ratios (>30 Ra, where Ra is atmospheric (super 3) He/ (super 4) He ratio) globally that are far in excess of the (super 3) He/ (super 4) He typical of the upper mantle sampled at mid-ocean ridges (8 Ra). These lavas have been suggested to be melts of a primitive, or possibly slightly depleted, mantle reservoir, i.e., either fertile or a depleted peridotite. Here we report evidence for geochemical enrichment in the high- (super 3) He/ (super 4) He mantle sampled by lavas with the highest (super 3) He/ (super 4) He from Hawaii, Samoa, and possibly Galapagos. The titanium concentrations in high- (super 3) He/ (super 4) He lavas from Samoa are too high to be explained by melts of a mantle peridotite, even at infinitesimally small degrees of melting, and the elevated Ti corresponds to elevated Pb-isotopic ratios. The highest (super 3) He/ (super 4) He lavas from Loihi, Hawaii, also have Ti concentrations that are too high to be melts of primitive mantle peridotite at the degrees of melt extraction proposed for this ocean island. Thus, Ti-rich material must have been added to the high- (super 3) He/ (super 4) He mantle reservoir, and this material is likely to be recycled mafic crust similar to MORB-like eclogite, which is consistent with the elevated Pb-isotopic ratios. We show that fractionation corrected, major element compositions of high- (super 3) He/ (super 4) He alkalic lavas can be satisfactorily modeled by melting and melt-rock interaction scenario in a fertile peridotite-MORB-eclogite hybrid system. Primitive peridotitic and recycled eclogitic reservoirs are suggested to be intimately associated in the deepest mantle and high- (super 3) He/ (super 4) He lavas from several localities may sample a mantle source that hosts a component of recycled oceanic crust.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 100
Serial Issue: 10
Title: Oceanic lavas sampling the high- (super 3) He/ (super 4) He mantle reservoir; primitive, depleted, or re-enriched?
Affiliation: State University of New York, Geology Department, New Paltz, NY, United States
Pages: 2066-2081
Published: 201510
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 131
Accession Number: 2016-007291
Categories: Igneous and metamorphic petrologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N19°00'00" - N28°30'00", W179°00'00" - W155°00'00"
N63°40'00" - N66°30'00", W24°45'00" - W13°30'00"
N18°53'60" - N18°55'60", W155°16'00" - W155°13'60"
S14°19'60" - S13°34'60", W173°00'00" - W169°00'00"
S01°30'00" - N01°00'00", W92°00'00" - W89°00'00"
Secondary Affiliation: Rice University, USA, United StatesUniversity of California at Santa Barbara, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201604
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