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Selective ingress of a Samoan plume component into the northern Lau backarc basin
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Selective ingress of a Samoan plume component into the northern Lau backarc basin
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Journal Article
Selective ingress of a Samoan plume component into the northern Lau backarc basin
2015
Overview
Intra-plate basalt isotopic trends require mixing between enriched mantle components (EM1, EM2, HIMU) and a primordial component with high
3
He/
4
He termed FOZO. However, proportions of components, geometric distributions within individual plumes, relative proportions of melting components and loci of mixing of melts and residues remain poorly understood. Here we present new Hf-Nd isotopic data of dredged sea floor basalts from the northern Lau backarc basin, ~250 km south of the subaerial and submerged Samoan chain, with high
3
He/
4
He,
20
Ne/
22
Ne and primordial
129
Xe/
130
Xe, characteristic of the FOZO component. Combined Hf-Nd-noble gas isotope systematics require mixing of refractory, sub-northwestern Lau backarc mantle only with a spatially restricted FOZO component, most plausibly sourced from part of the Samoan plume. Other geographically restricted and possibly volumetrically minor enriched Samoan plume components are not detectable in northern Lau backarc samples, consistent with selective plume ingress of the FOZO component beneath the basin.
Ocean island basalts contain primordial and recycled crustal components, sourced from the deep mantle by plumes. Here, the authors examine Hf-Nd-He isotopes in ocean floor basalts south of Samoa and suggest that selective ingress of only the primordial component from the Samoan plume can occur.
Publisher
Nature Publishing Group UK,Nature Publishing Group
