2010
DOI: 10.1029/2009gc002847
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Across‐arc geochemical trends in the Izu‐Bonin arc: Contributions from the subducting slab, revisited

Abstract: [1] New Sr, Nd, Hf, and Pb isotope and trace element data are presented for basalts erupted in the Izu back arc. We propose that across-arc differences in the geochemistry of Izu-Bonin arc basalts are controlled by the addition of aqueous slab fluids to the volcanic front and hydrous partial melt of the slab to the back arc. The volcanic front has the lowest concentrations of incompatible elements, the strongest relative enrichments of fluid-mobile elements, and the most radiogenic Sr, Nd, Hf, and Pb, suggesti… Show more

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Cited by 129 publications
(164 citation statements)
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References 109 publications
(312 reference statements)
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“…2. Rear-arc volcanic rocks include all the rear-arc seamount volcanoes from 3 to 17 Ma (Hochstaedter et al, 2001;Ishizuka et al, 2002Ishizuka et al, , 2003aIshizuka et al, , 2003bIshizuka et al, , 2006aIshizuka et al, , 2006bMachida et al, 2003Machida et al, , 2008Tollstrup et al, 2010), which are generally higher in Zr/Y (1.4-6.7) compared to arc-front rocks at comparable SiO 2 , but there is some overlap between R2 arc-front rhyolites and rear-arc seamount rocks.…”
Section: Volcaniclastics Compositions and Provenancementioning
confidence: 99%
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“…2. Rear-arc volcanic rocks include all the rear-arc seamount volcanoes from 3 to 17 Ma (Hochstaedter et al, 2001;Ishizuka et al, 2002Ishizuka et al, , 2003aIshizuka et al, , 2003bIshizuka et al, , 2006aIshizuka et al, , 2006bMachida et al, 2003Machida et al, , 2008Tollstrup et al, 2010), which are generally higher in Zr/Y (1.4-6.7) compared to arc-front rocks at comparable SiO 2 , but there is some overlap between R2 arc-front rhyolites and rear-arc seamount rocks.…”
Section: Volcaniclastics Compositions and Provenancementioning
confidence: 99%
“…of the arc (i.e., behind the arc front) and lie on arc crust, although the westernmost end of the rear-arc seamount chains lies on Shikoku Basin oceanic crust. The bimodal rift-type magmas differ from both the arc front and the rear-arc seamount chains in trace element and radiogenic isotopic ratios; this has been variably attributed to (1) a transition from flux to decompression mantle melting as arc rifting commences, (2) a change in the character of slabderived flux, or (3) a change in the mantle source through mantle wedge convection (Hochstaedter et al, 1990a(Hochstaedter et al, , 1990b(Hochstaedter et al, , 2001Ishizuka et al, 2003aIshizuka et al, , 2006bTollstrup et al, 2010). The Izu rear-arc seamount chains are as long as ~80 km and strike N60°E ( Figure F6).…”
Section: Neogene Rear-arc Volcanism Izu Arcmentioning
confidence: 99%
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“…mantle recycling (e.g. Chauvel et al, 2009;Tollstrup et al, 2010;Nebel et al, 2011). Thus, although Hf isotopes can fingerprint crustal contamination within arc magmas, they alone do not allow the pathways of recycling to be determined, and thus also do not constrain unexposed crustal architecture.…”
Section: Oxygen Isotopes In Zirconmentioning
confidence: 99%
“…Furthermore, silicic volcanoes of the Quaternary arc front and Miocene granitic rocks in the Izu collision zone on Honshu are inferred to have formed by melting of Eocene-Oligocene arc crust (Tamura et al, 2009(Tamura et al, , 2010. As discussed in "Scientific results," Neogene rhyolite volcanism may be more important in the Izu rear-arc seamount chain than previously thought and could have resulted from melting of Paleogene "arc basement."…”
Section: Evolution Of the Ibm Arc Systemmentioning
confidence: 77%