2007
DOI: 10.1007/s00410-006-0164-6
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Simultaneous boninitic and arc-tholeiitic volcanisms in the Izu forearc region during early arc volcanism, based on ODP Leg 125 Site 786

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Cited by 22 publications
(6 citation statements)
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“…Perhaps these various melts were actually derived from melting of mantle sources that were in close proximity but which were variably altered and therefore contained variable amounts of water for release on melting, from minerals such as serpentine. Also as considerable throughput of magma is required to produce a podiform chromitite the composition of the source region from which the melts were extracted may have gradually evolved with time, producing melts with varying Cr2O3 and Al2O3 content (Haraguchi and Ishii, 2007;Dilek and Thy, 2009). There is no evidence in the data presented here to determine which chromitites (those which are Ti-rich or Ti-poor) crystallized first at Harold's Grave or Cliff.…”
Section: Intradeposit Variation-the Other Chromitite Deposits (Haroldmentioning
confidence: 98%
“…Perhaps these various melts were actually derived from melting of mantle sources that were in close proximity but which were variably altered and therefore contained variable amounts of water for release on melting, from minerals such as serpentine. Also as considerable throughput of magma is required to produce a podiform chromitite the composition of the source region from which the melts were extracted may have gradually evolved with time, producing melts with varying Cr2O3 and Al2O3 content (Haraguchi and Ishii, 2007;Dilek and Thy, 2009). There is no evidence in the data presented here to determine which chromitites (those which are Ti-rich or Ti-poor) crystallized first at Harold's Grave or Cliff.…”
Section: Intradeposit Variation-the Other Chromitite Deposits (Haroldmentioning
confidence: 98%
“…• Comparison of ODP Hole 786B with the VMS hosting mafic and bi-modal mafic volcanic sequences from the Semail ophiolite, the Newfoundland Appalachians and the Flin Flon Belt, suggests that magmatic fluid exsolution could be a common mechanism for Au enrichment in mafic and bi-modal mafic/felsic VMS deposits. Arculus et al (1992), Alt et al (1998) and Haraguchi and Ishii (2007). Figure 10.…”
Section: Discussionmentioning
confidence: 99%
“…The lower part of Hole 786B, from 754 to 828 mbsf, is characterised by sheeted dykes that correspond to the transition zone between the sheeted dyke complex and the volcanic section (Arculus et al 1992). Based on geochemistry and stratigraphic position, eight lithological units were distinguished (Arculus et al 1992) which are grouped within four magmatic series: low Ca boninite, intermediate Ca boninite, andesite-dacite-rhyolite (ADR) and high Ca boninite (Murton et al 1992;Pearce et al 1992;Haraguchi and Ishii 2007). The low Ca boninite series, characterised by low Ca boninite (LCBon) and bronzite-andesite (LCBrzA), dominates the lower portion of Hole 786B below 690 mbsf and is the most primitive magmatic series (Arculus et al 1992;Murton et al 1992).…”
Section: Magmatic Seriesmentioning
confidence: 99%
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“…3). Low‐K tholeiitic magmatism also took place associated with intermediate to high‐Ca boninite at a later stage of this volcanism (Pearce et al , 1992; Maehara & Maeda, 2004; Haraguchi & Ishii, 2007).…”
Section: Overview Of Volcanotectonic History Of the Izu–bonin Arcmentioning
confidence: 99%