@article{PAR00011055,
  title = {{S}mall-scale coexistence of island-arc- and enriched-{MORB}-type basalts in the central {V}anuatu arc},
  author = {{S}orbadere, {F}. and {S}chiano, {P}ierre and {M}etrich, {N}. and {B}ertagnini, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e report here major, trace element and {S}r-{N}d-{P}b isotopic data for a new set of basaltic lavas and melt inclusions hosted in {M}g-rich olivines ({F}o(86-91)) from {M}ota {L}ava, in the {B}anks islands of the {V}anuatu island arc. {T}he results reveal the small-scale coexistence of typical island-arc basalts ({IAB}) and a distinct type of {N}b-enriched basalts ({NEB}) characterized by primitive mantle-normalized trace element patterns without high-field-strength element ({HFSE}) depletion. {T}he {IAB} show trace element patterns with prominent negative {HFSE} anomalies acquired during melting of mantle sources enriched with slab-derived, {H}2{O}-rich components during subduction. {I}n contrast, the {NEB} display trace element features that compare favourably with enriched-mid-ocean ridge basalt ({MORB}) and the most enriched basalts from the {V}anuatu back-arc troughs. {B}oth their trace element and {N}d-{S}r isotopic compositions require partial melting of an enriched-{MORB}-type mantle source, almost negligibly contaminated by slab-derived fluids (similar to 0.2 wt%). {T}he coexistence of these two distinct types of primitive magma, at the scale of one volcanic island and within a relatively short span of time, would reflect a heterogeneous mantle source and/or tapping of distinct mantle sources. {D}irect ascent of such distinct magmas could be favoured by the extensive tectonic setting of {M}ota {L}ava {I}sland, allowing decompression melting and sampling of variable mantle sources. {S}ignificantly, this island is located at the junction of the {N}-{S} back-arc troughs and the {E}-{W} {H}azel {H}ome extensional zone, where the plate motion diverges in both direction and rate. {M}ore broadly, this study indicates that crustal faulting in arc contexts would permit basaltic magmas to reach {E}arth's surface, while preserving the geochemical heterogeneity of their mantle sources.},
  keywords = {{V}anuatu arc ; {I}sland-arc basalts ; {N}b-enriched basalts ; {M}antle source},
  booktitle = {},
  journal = {{C}ontributions to {M}ineralogy and {P}etrology},
  volume = {166},
  numero = {5},
  pages = {1305--1321},
  ISSN = {0010-7999},
  year = {2013},
  DOI = {10.1007/s00410-013-0928-8},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00011055},
}