A deep mantle source for high 3He/4He ocean island basalts (OIB) inferred from Pacific near-ridge seamount lavas

Details A deep mantle source for high 3He/4He ocean island basalts (OIB) inferred from Pacific near-ridge seamount lavas A deep mantle source for high 3He/4He ocean island basalts (OIB) inferred from Pacific near-ridge seamount lavas

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620316h&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 20, CiteID L20316

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3

Biogeosciences: Contaminant And Organic Biogeochemistry (0792), Geochemistry: Mid-Oceanic Ridge Processes (3614, 8416), Geochemistry: Intra-Plate Processes (3615, 8415), Geochemistry: Mantle Processes (3621), Geochemistry: Composition Of The Mantle

Scientific paper

One of the most contentious issues in the debate on the origin of volcanic island and seamount chains is the significance of high 3He/4He ratios at such locations. The contemporary hotspot hypothesis calls for the high 3He/4He signature to be derived from a distinct source reservoir that lies deep in the mantle. The competing plate stress hypothesis claims that extreme isotopic signals, such as the high 3He/4He, come from dispersed crustal lithologies in the upper mantle. Here, we show that lavas from the East Pacific Rise-the ridge axis and near-ridge seamounts, which have radiogenic isotope compositions overlapping with other Pacific OIB, do not have high 3He/4He ratios. This suggests that high 3He/4He is not associated with dispersed, heterogeneous lithologies embedded in the upper mantle. We conclude that the mantle source of high 3He/4He OIB is unique to volcanic island and seamount chains and likely resides at depth in the mantle.

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