Across-arc geochemical trends in the Izu-Bonin arc: Contributions from the subducting slab
作者： Alfred Hochstaedter , Jim Gill , Robert Peters , Phil Broughton , Pete Holden
DOI: 10.1029/2000GC000105
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摘要: [1] We propose that across-arc differences in the geochemistry of Izu-Bonin arc magmas are controlled by addition fertile-slab fluids to depleted mantle at volcanic front, and residual-slab fertile back without slab melting or contemporaneous spreading. The consists a an extensional zone, seamount chains (the Western Seamounts) trend into Shikoku Basin. Each province produces distinct suite arc-like rocks have relative Nb depletions high ratios fluid-mobile elements field strength elements. front has lowest concentrations incompatible strongest enrichments (high U/Nb, Ba/Nb, Pb/Zr, Th/Nb, 206Pb/204Pb, ɛNd, 87Sr/86Sr). A fluid derived from both sediment altered oceanic crust explains most slab-related characteristics front. Seamounts some zone lower 87Sr/86Sr, Ba/Th, U/Th; moderate Ba/Nb U/Nb; similar higher Th/Nb Th/Nd. Although ɛNd Th/Nd tempt melt explanation, lack correlation between proxies, such as Ce/Ce*, precludes melts. subduction component for is probably dehydrated residual was beneath (as well trenchward of) This added elementally isotopically more enriched Seamounts.
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