Turbidite geochemistry and evolution of the Izu-Bonin arc and continents

Gill, James B.; Hiscott, Richard N.; Vidal, Ph.

doi:10.1016/0024-4937(94)90058-2

Cited by 84 publications

(104 citation statements)

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“…The rare-earth elements (REE) and trace elements Ba, Th, Hf, Ta, U, Pb, Rb and Cs were also analyzed at Washington State University by a Sciex Elan model 250 ICP-MS equipped with a Babington nebulizer, watercooled spray chamber and Brooks mass £ow controller. The precision on in-house standards [8,13], basalts from the Quaternary arc [14,15] and basalts from the Sumisu Rift [17].…”

Section: Methodsmentioning

confidence: 99%

“…Their values do fall on a trend that is characteristic of a variety of lavas from the Philippine Sea plate. These include MORB-type basalt from the West Philippine, Parece Vela and Shikoku Basins [20,21], as well as arc-related lavas from the Palau Kyushu ridge [21], the modern arc front [14] and forearc boninites [18,19,22,23]. This characteristic isotopic signature of Philippine Sea plate rocks is the same as that from Indian Ocean spreading ridges and is interpreted to be due to a shared asthenospheric mantle domain [20,24].…”

Section: Isotope Geochemistrymentioning

confidence: 96%

“…3. They are compared to forearc basement recovered at Site 786 of ODP Leg 125 [8,13], basalts from the Quaternary IzuB onin arc [14,15], Paci¢c plate MORB [16] and basalts from the Sumisu Rift [17] Chondrite-normalized REE patterns for the inner trench slope samples (Fig. 4) show depletion of the light REE and Ba, with values of La/Yb CN from 0.4 to 0.6.…”

Section: Geochemistrymentioning

confidence: 99%

“…The patterns for each of the samples are strikingly parallel, even for the samples dredged from Myojin forearc seamount. The samples do not have the typical enrichment of largeion lithophile elements (such as Ba) that is so characteristic of island arc magmas, including basalts from the Quaternary Izu^Bonin arc [14,15], boninites from the forearc basement [13,18,19] and Neogene sills from the Mariana and Izu^Bo-nin forearcs [7]. They also do not share REE characteristics with backarc basin basalts of the Sumisu Rift [17] or the Shikoku Basin [5,20].…”

Section: Geochemistrymentioning

confidence: 99%

“…[16], forearc basement drilled from ODP Site 786 [18], Site 792 [18] and Site 793 [19] (see Fig. 1), boninite from the islands of Chichijima [23] and Hahajima [22], Plio-Pleistocene Izu^Bonin arc volcanics from Torishima and Miyakejima volcanoes [14] and other Philippine Sea plate submarine lavas including the West Philippine, Parece Vela and Shikoku Basins [20,21] and the Sumisu Rift [40].…”

Section: Geochemistrymentioning

confidence: 99%

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A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

DeBari

Taylor

Spencer

et al. 1999

Earth and Planetary Science Letters

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Basement outcrops sampled by submersible and dredge from the inner slope of the Izu^Bonin trench at 32³N and 6200^6700 m water depth have a distinct mid-ocean ridge basalt (MORB) chemistry unlike any other rocks previously sampled in the Izu^Bonin arc. They are low K tholeiites with moderate TiO 2 (0.7^1.8 wt%), extremely low Ba (1.5^7 parts per million), low Ba/La (1.2^3) and are depleted in light rare-earth elements. These samples could represent either an accreted piece of subducting Pacific plate or a trapped remnant of Philippine Sea plate on which the Izu^Bonin arc was built. Although their major and trace element chemistry do not help to distinguish their source, the Sr, Nd and Pb isotopes clearly support a Philippine Sea plate origin. The isotopic signature of the inner trench slope samples matches that of Philippine Sea plate lavas, with 87 2) values compared to the Northern Hemisphere reference line (NHRL) and their isotopic signature is distinct from the Mesozoic Pacific MORB being subducted. These are the first samples of trapped Philippine Sea oceanic crust discovered in the IzuB onin^Mariana arc. They require that models for the formation of intra-oceanic arc crust account for pre-existing oceanic crust and that estimates of arc magma production rates are lowered accordingly. ß 1999 Elsevier Science B.V. All rights reserved.

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Section: Methodsmentioning

confidence: 99%

Section: Isotope Geochemistrymentioning

confidence: 96%

Section: Geochemistrymentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

See 3 more Smart Citations

A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

DeBari

Taylor

Spencer

et al. 1999

Earth and Planetary Science Letters

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Geochemical and isotopic study of a plutonic suite and related early volcanic sequences in the southern Mariana forearc

Hickey‐Vargas

Fryer²,

Salters

et al. 2014

Geochem Geophys Geosyst

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The forearc of the southern Mariana arc preserves igneous suites formed during the initiation of subduction between the Pacific and Philippine Sea plates about 50 Ma ago. We have studied rare suites of gabbroic to tonalitic plutonic rocks dredged from two locations in the Mariana forearc by cruise by University of Hawai'i cruise KK81-06-26. Comparison of the chemical and isotopic (Sr, Nd, Pb, and Hf) characteristics of these rocks with well-studied volcanics from the forearc reveals that the plutonics from dredge RD63 and RD64 are chemically related to boninites erupted at 48-43 Ma. This is the first report of boninitelike plutonics in the southern Mariana trench. These suites have trace element characteristics consistent with island arc settings (U/Th: 0.58-1.44, Nb/La: 0.18-0.79) and other features uniquely connected with boninites: TiO 2 < 0.15 wt % and Zr/Sm > 25. RD63 plutonics resemble nearby boninite volcanics and were likely derived from differentiated boninite magma with 58% SiO 2 , forming gabbro by crystal accumulation, diorite and quartz diorite by crystallization, and tonalite by crystallization and/or partial melting. The RD64 suite (gabbro through tonalite) may have had a more depleted magma source and formed by accumulation and crystallization only. Although the physical dimensions of the plutonic body are unknown, the relationship with boninites indicates that felsic intrusives can form during early stages of island arc development. Such rocks could form part of midcrustal low-velocity layers detected in arc crust by seismic studies. Tonalites similar to those studied here are also found in some ophiolites.

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Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

Barth

Tani

Meffre

et al. 2017

Geochem Geophys Geosyst

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A 1.2 km thick Paleogene volcaniclastic section at International Ocean Discovery Program Site 351‐U1438 preserves the deep‐marine, proximal record of Izu‐Bonin oceanic arc initiation, and volcano evolution along the Kyushu‐Palau Ridge (KPR). Pb/U ages and trace element compositions of zircons recovered from volcaniclastic sandstones preserve a remarkable temporal record of juvenile island arc evolution. Pb/U ages ranging from 43 to 27 Ma are compatible with provenance in one or more active arc edifices of the northern KPR. The abundances of selected trace elements with high concentrations provide insight into the genesis of U1438 detrital zircon host melts, and represent useful indicators of both short and long‐term variations in melt compositions in arc settings. The Site U1438 zircons span the compositional range between zircons from mid‐ocean ridge gabbros and zircons from relatively enriched continental arcs, as predicted for melts in a primitive oceanic arc setting derived from a highly depleted mantle source. Melt zircon saturation temperatures and Ti‐in‐zircon thermometry suggest a provenance in relatively cool and silicic melts that evolved toward more Th and U‐rich compositions with time. Th, U, and light rare earth element enrichments beginning about 35 Ma are consistent with detrital zircons recording development of regional arc asymmetry and selective trace element‐enriched rear arc silicic melts as the juvenile Izu‐Bonin arc evolved.

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Turbidite geochemistry and evolution of the Izu-Bonin arc and continents

Cited by 84 publications

References 50 publications

A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

A trapped Philippine Sea plate origin for MORB from the inner slope of the Izu–Bonin trench

Geochemical and isotopic study of a plutonic suite and related early volcanic sequences in the southern Mariana forearc

Generation of Silicic Melts in the Early Izu‐Bonin Arc Recorded by Detrital Zircons in Proximal Arc Volcaniclastic Rocks From the Philippine Sea

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