{"data":{"id":"10.1594/pangaea.713681","type":"dois","attributes":{"doi":"10.1594/pangaea.713681","prefix":"10.1594","suffix":"pangaea.713681","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Straub, Susanne M","givenName":"Susanne M","familyName":"Straub","affiliation":[],"nameIdentifiers":[]},{"name":"Layne, Graham D","givenName":"Graham D","familyName":"Layne","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"Chemistry and boron isotope ratios of Izu arc front volcanic rocks"}],"publisher":"PANGAEA","container":{},"publicationYear":2002,"subjects":[{"subject":"Drilling/drill rig","subjectScheme":"Method"},{"subject":"Leg125","subjectScheme":"Campaign"},{"subject":"Joides Resolution","subjectScheme":"Basis"},{"subject":"Ocean Drilling Program (ODP)","subjectScheme":"Project"}],"contributors":[],"dates":[{"date":"2002","dateType":"Issued"}],"language":"en","types":{"ris":"GEN","bibtex":"misc","citeproc":"article","schemaOrg":"Collection","resourceType":"Supplementary Publication Series of Datasets","resourceTypeGeneral":"Collection"},"relatedIdentifiers":[{"relationType":"IsSupplementTo","relatedIdentifier":"10.1016/s0012-821x(02)00517-4","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["2 datasets"],"formats":["application/zip"],"version":null,"rightsList":[{"rights":"Creative Commons Attribution 3.0 Unported","rightsUri":"https://creativecommons.org/licenses/by/3.0/legalcode","schemeUri":"https://spdx.org/licenses/","rightsIdentifier":"cc-by-3.0","rightsIdentifierScheme":"SPDX"}],"descriptions":[{"description":"The process of fluid release from the subducting slab beneath the Izu arc volcanic front (Izu VF) was examined by measuring B concentrations and B isotope ratios in the Neogene fallout tephra (ODP Site 782A). Both were measured by secondary ion mass spectrometry, in a subset of matrix glasses and glassy plagioclase-hosted melt inclusions selected from material previously analyzed for major and trace elements (glasses) and radiogenic isotopes (Sr, Nd, Pb; bulk tephra). These tephra glasses have high B abundances (~10-60 ppm) and heavy delta11B values (+4.5‰ to +12.0‰), extending the previously reported range for Izu VF rocks (delta11B, +7.0‰ to +7.3‰). The glasses show striking negative correlations of delta11B with large ion lithophile element (LILE)/Nb ratios. These correlations cannot be explained by mixing two separate slab fluids, originating from the subducting sediment and the subducting basaltic crust, respectively (model A). Two alternative models (models B and C) are proposed. Model B proposes that the inverse correlations are inherited from altered oceanic crust (AOC), which shows a systematic decrease of B and LILE with increasing depth (from basaltic layer 2A to layer 3), paralleled by an increase in delta11B (from ~ +1‰ to +10‰ to +24‰). In this model, the contribution of sedimentary B is insignificant (\u0026lt;4% of B in the Izu VF rocks). Model C explains the correlation as a mixture of a low-delta11B (~ +1‰) 'composite' slab fluid (a mixture of metasediment- and metabasalt-derived fluids) with a metasomatized mantle wedge containing elevated B (~1-2 ppm) and heavy delta11B (~ +14‰). The mantle wedge was likely metasomatized by 11B-rich fluids beneath the outer forearc, and subsequently down dragged to arc front depths by the descending slab. Pb-B isotope systematics indicate that, at arc front depths, ~ 53% of the B in the Izu VF is derived from the wedge. This implies that the heavy delta11B values of Izu VF rocks are largely a result of fluid fractionation, and do not reflect variations in slab source provenance (i.e. subducting sediment vs. basaltic crust). Since the B content of the peridotite at the outer forearc (7-58 ppm B, mean 24 +/- 16 ppm) is much higher than beneath the arc front (~1-2 ppm B), the hydrated mantle wedge must have released a B-rich fluid on its downward path. This 'wedge flux' can explain (1) the across-arc decrease in B and delta11B (e.g. Izu, Kuriles), without requiring a progressive decrease in fluid flux from the subducting slab, and (2) the thermal structure of volcanic arcs, as reflected in the B and delta11B variations of volcanic arc rocks.","descriptionType":"Abstract"},{"description":"Supplement to: Straub, Susanne M; Layne, Graham D (2002): The systematics of boron isotopes in Izu arc front volcanic rocks. Earth and Planetary Science Letters, 198(1-2), 25-39","descriptionType":"Other"}],"geoLocations":[{"geoLocationPoint":{"pointLatitude":"30.860999999999997","pointLongitude":"141.3142"}},{"geoLocationPlace":"North Pacific 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