Origin of the Indian Ocean‐type isotopic signature in basalts from Philippine Sea plate spreading centers: An assessment of local versus large‐scale processes

Hickey‐Vargas, Rosemary

doi:10.1029/98jb02052

Cited by 179 publications

(198 citation statements)

References 70 publications

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“…They also do not share REE characteristics with backarc basin basalts of the Sumisu Rift [17] or the Shikoku Basin [5,20]. The REE patterns do, however, show similarities to Mesozoic Paci¢c MORB [16] and MORB from the West Philippine Basin [20], although the Paci¢c plate samples show £atter patterns with generally higher abundances for a given MgO content than the trench slope samples (Fig. 4).…”

Section: Geochemistrymentioning

confidence: 98%

“…4). West Philippine Basin MORB sampled at Deep Sea Drilling Program Site 447 [20] have REE patterns most closely related to the trench slope samples. [16], forearc basement drilled from ODP Site 786 [18], Site 792 [18] and Site 793 [19] (see Fig.…”

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%

“…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]. This Indian Ocean mantle domain is distinct from that of Paci¢c plate MORB [20,24].…”

Section: Isotope Geochemistrymentioning

confidence: 99%

“…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]. The REE patterns do, however, show similarities to Mesozoic Paci¢c MORB [16] and MORB from the West Philippine Basin [20], although the Paci¢c plate samples show £atter patterns with generally higher abundances for a given MgO content than the trench slope samples (Fig.…”

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: Geochemistrymentioning

confidence: 98%

Section: Geochemistrymentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

Section: Isotope 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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Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

Kimura

Gill

Kunikiyo³

et al. 2014

Geochem Geophys Geosyst

211

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In response to the subduction of the young Shikoku Basin of the Philippine Sea Plate, arc magmas erupted in SW Japan throughout the late Cenozoic. Many magma types are present including ocean island basalt (OIB), shoshonite (SHO), arc-type alkali basalt (AB), typical subalkalic arc basalt (SAB), high-Mg andesite (HMA), and adakite (ADK). OIB erupted since the Japan Sea back-arc basin opened, whereas subsequent arc magmas accompanied subduction of the Shikoku Basin. However, there the origin of the magmas in relation to hot subduction is debated. Using new major and trace element and Sr-Nd-Pb-Hf isotope analyses of 324 lava samples from seven Quaternary volcanoes, we investigated the genetic conditions of the magma suites using a geochemical mass balance model, Arc Basalt Simulator version 4 (ABS4), that uses these data to solve for the parameters such as pressure/temperature of slab dehydration/melting and slab flux fraction, pressure, and temperature of mantle melting. The calculations suggest that those magmas originated from slab melts that induced flux melting of mantle peridotite. The suites differ mostly in the mass fraction of slab-melt flux, increasing from SHO through AB, SAB, HMA, to ADK. The pressure and temperature of mantle melting decreases in the same order. The suites differ secondarily in the ratio of altered oceanic crust to sediment in the source of the slab melt. The atypical suites associated with hot subduction result from unusually large mass fractions of slab melt and unusually cool mantle temperatures.

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Origins of felsic magmas in Japanese subduction zone: Geochemical characterizations of tephra from caldera‐forming eruptions <5 Ma

Kimura

Nagahashi

Satoguchi

et al. 2015

Geochem Geophys Geosyst

120

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Dacitic to rhyolitic glass shards from 80 widespread tephras erupted during the past 5 Mys from calderas in Kyushu, and SW, central, and NE Japan were analyzed. Laser ablation inductively coupled plasma mass spectrometry was used to determine 10 major and 33 trace elements and A few tephras from SW Japan were identified as adakite and alkali rhyolite and were regarded to have originated from slab melt and mantle melt, respectively. The Pb isotope ratios of the tephras are comparable to those of the intermediate lavas in the source areas but are different from the basalts in these areas. The crustal assimilants for the intermediate lavas were largely from crustal melts and are represented by the rhyolitic tephras. A large heat source is required for forming large volumes of felsic crustal melts and is usually supplied by the mantle via basalt. Hydrous arc basalt formed by cold slab subduction is voluminous, and its heat transfer with high water content may have melted crustal rocks leading to effective felsic magma production. Coincidence of basalt and felsic magma activities shown by this study suggests caldera-forming eruptions are ultimately the effect of a mantle-driven cause.

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Origin of the Indian Ocean‐type isotopic signature in basalts from Philippine Sea plate spreading centers: An assessment of local versus large‐scale processes

Cited by 179 publications

References 70 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

Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

Origins of felsic magmas in Japanese subduction zone: Geochemical characterizations of tephra from caldera‐forming eruptions <5 Ma

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