Mantle hotspot neon in basalts from the Northwest Lau Back-arc Basin

The neon isotope compositions of basalts from the Northwest Lau Back‐arc Basin reflect three‐component mixing between an ocean island basalt (OIB) mantle hotspot component, mid‐ocean ridge basalt (MORB) mantle, and atmosphere. Our study confirms that a mantle hotspot signature is present in the neon...

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Bibliographic Details
Published in:Geophysical research letters 2012-04, Vol.39 (8), p.n/a
Main Authors: Lupton, J. E., Arculus, R. J., Evans, L. J., Graham, D. W.
Format: Article
Language:English
Subjects:
Basalt
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Geophysics
Helium
Lau Basin
Lava
Mantle Hotspot
Marine geology
Mineralogy
Neon
Petrology
Systematics
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Summary:The neon isotope compositions of basalts from the Northwest Lau Back‐arc Basin reflect three‐component mixing between an ocean island basalt (OIB) mantle hotspot component, mid‐ocean ridge basalt (MORB) mantle, and atmosphere. Our study confirms that a mantle hotspot signature is present in the neon isotopes of both the Rochambeau Rifts and the Northwest Lau Spreading Center (NWLSC), just as it is in the helium isotopes. Furthermore, the Ne isotope signature in the Rochambeau Rifts lava having the highest3He/4He ratio (28 Ra) most closely resembles that observed previously in the highest 3He/4He lavas from Samoa. The coupled He–Ne isotope systematics are further evidence for incursion into this region of material derived from the Samoan mantle plume. Key Points New results show the presence of mantle hotspot type neon in the NW Lau Basin Results indicate 3 component mixing between air, MORB and OIB components Results support the presence of Samoan mantle plume material in NW Lau Basin
ISSN:0094-8276
1944-8007
DOI:10.1029/2012GL051201