Submarine back-arc lava with arc signature : Fonualei Spreading Center, northeast Lau Basin, Tonga Keller, Nicole S. Arculus, Richard J. Hermann, Jörg Richards, Simon 2010-06-08T19:34:07Z 2010-06-08T19:34:07Z 2008-08-30
dc.description Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): B08S07, doi:10.1029/2007JB005451. en_US
dc.description.abstract We present major, volatile, and trace elements for quenched glasses from the Fonualei Spreading Center, a nascent spreading system situated very close to the Tofua Volcanic Arc (20 km at the closest), in the northeast Lau Basin. The glasses are basalts and basaltic andesites and are inferred to have originated from a relatively hot and depleted mantle wedge. The Fonualei Spreading Center shows island arc basalt (IAB) affinities, indistinguishable from the Tofua Arc. Within the Fonualei Spreading Center no geochemical trends can be seen with depth to the slab and/or distance to the arc, despite a difference in depth to the slab of >50 km. Therefore we infer that all the subduction-related magmatism is captured by the back arc as the adjacent arc is shut off. There is a sharp contrast between the main spreading area of the Fonualei Spreading Center (FSC) and its northernmost termination, the Mangatolu Triple Junction (MTJ). The MTJ samples are characteristic back-arc basin basalts (BABB). We propose that the MTJ and FSC have different mantle sources, reflecting different mantle origins and/or different melting processes. We also document a decrease in mantle depletion from the south of the FSC to the MTJ, which is the opposite to what has been documented for the rest of the Lau Basin where depletion generally increases from south to north. We attribute this reverse trend to the influx of less depleted mantle through the tear between the Australian and the Pacific plates, at the northern boundary of the Lau Basin. en_US
dc.description.sponsorship NSK acknowledges the support of an A.E. Ringwood Scholarship from the RSES. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research 113 (2008): B08S07 en_US
dc.identifier.doi 10.1029/2007JB005451
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Lau Basin en_US
dc.subject Back-arc basin en_US
dc.subject Subduction en_US
dc.title Submarine back-arc lava with arc signature : Fonualei Spreading Center, northeast Lau Basin, Tonga en_US
dc.type Article en_US
dspace.entity.type Publication
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