Subduction-modified pelagic sediments as the enriched component in back-arc basalts from the Japan Sea: Ocean Drilling Program Sites 797 and 794

Cousens, Brian; Allan, James F.; Gorton, Michael P.

doi:10.1007/bf00307275

Cited by 116 publications

(79 citation statements)

References 72 publications

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“…Boström et al 1969;Bonatti et al 1972;Cronan et al 1976). Western Pacific pelagic sediments are shown as green polygons (Lin 1992;Cousens et al 1994). The ridge crest metalliferous sediments are chemically similar to the EPR metalliferous sediments from deeper ridge flanks (e.g.…”

Section: Chemical Evidence Of Sediment Provenancementioning

confidence: 97%

“…The absolute values or ratios of trace element and REEs indicate the extent of reworking/recycling and the relative contributions of different possible sources, i.e. E-MORB, N-MORB, volcanic rocks of Japan, the IzuBonin arc, their related tephras (Kutterolf et al in press), loess (Chauvel et al 2014, Liang et al 2009), upper continental crust (UCC) (McLennan et al 1993), or pelagic sediments (Lin 1992;Cousens et al 1994).…”

Section: Chemical Evidence Of Sediment Provenancementioning

confidence: 99%

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Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Robertson

Kutterolf

Avery

et al. 2017

International Geology Review

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New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary and tectono-magmatic development of the Izu-Bonin outer forearc region. The oceanic basement of the Izu-Bonin forearc was created by supra-subduction zone seafloor spreading during early Eocene (c. 50-51 Ma). Seafloor spreading created an irregular seafloor topography on which talus locally accumulated. Oxide-rich sediments accumulated above the igneous basement by mixing of hydrothermal and pelagic sediment. Basaltic volcanism was followed by a hiatus of up to 15 million years as a result of topographic isolation or sediment bypassing. Variably tuffaceous deep-sea sediments were deposited during Oligocene to early Miocene and from mid-Miocene to Pleistocene. The sediments ponded into extensional fault-controlled basins, whereas condensed sediments accumulated on a local basement high. Oligocene nannofossil ooze accumulated together with felsic tuff that was mainly derived from the nearby Izu-Bonin arc. Accumulation of radiolarian-bearing mud, silty clay, and hydrogenous metal oxides beneath the carbonate compensation depth (CCD) characterized the early Miocene, followed by middle Miocene-Pleistocene increased carbonate preservation, deepened CCD and tephra input from both the oceanic Izu-Bonin arc and the continental margin Honshu arc. The Izu-Bonin forearc basement formed in a near-equatorial setting, with late Mesozoic arc remnants to the west. Subduction-initiation magmatism is likely to have taken place near a pre-existing continent-oceanic crust boundary. The Izu-Bonin arc migrated northward and clockwise to collide with Honshu by early Miocene, strongly influencing regional sedimentation. ARTICLE HISTORY

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Section: Chemical Evidence Of Sediment Provenancementioning

confidence: 97%

Section: Chemical Evidence Of Sediment Provenancementioning

confidence: 99%

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Robertson

Kutterolf

Avery

et al. 2017

International Geology Review

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“…Such influx might be related to the opening of the Sea of Japan. On the basis of observations of spreading center basalts of the Japan Sea basin, alkaline basalts of Ulreung and Dog islands, and tholeiitic basalts of the northern Japan rift zone (Nohda et al, 1988;Tatsumoto and Nakamura, 1991;Cousens et al, 1994), the back -arc spreading of the Sea of Japan has been interpreted as a response to the penetration of the asthenosphere into the cratonic lithospheric mantle with MORB -like Sr -Nd -Pb isotopic compositions. Our model calculations strongly indicate that the Type 1 ultramafic xenolith was formed by open -system melting with the involvement of an influx of alkali basalt asthenospheric melt with MORB -like isotopic composition.…”

Section: Discussionmentioning

confidence: 99%

Trace element and Sr-Nd isotopic features of ultramafic xenoliths from Kurose, Southwest Japan

Yoshikawa

Arai

Ishida

et al. 2010

Journal of Mineralogical and Petrological Sciences

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Ultramafic xenoliths from Kurose, Southwest Japan, are fragments of the lithospheric mantle beneath the back arc of the active Southwest Japan volcano -tectonic arc. Trace element and Sr -Nd isotopic compositions of the clinopyroxenes in the ultramafic xenoliths suggest that several enrichment processes are responsible for the geochemical variation. These xenoliths would have witnessed the following events: (1) open -system partial melting of the continental lithosphere with an influx of an asthenospheric melt with MORB -like isotopic composition during the formation of the back -arc basin that resulted from the Japan Sea opening, (2) open -system melting under an influx of a fluid/melt derived from a subducted slab, and (3) metasomatism after these partial melting events by an island arc tholeiitic basalt melt in the Neogene period. Moreover, variations in the depletion levels of Zr and Ti in the clinopyroxenes suggest that source depletion preceded the melting and metasomatic events.

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“…The mantle array is defined by many oceanic basalts and a bulk Earth value for 87 Sr/ 86 Sr can be obtained from this trend. Data for back-arc basin basalts -BABB (shaded field) compiled from Wilson (1989) and references therein, Cousens et al (1994) and references therein, Pearce et al (1995), Gribble et al (1998) and Ewart et al (1998). Data for mid-ocean ridge basalts -MORB (solid line) compiled from Wilson (1989) and references therein and Cousens et al (1994), references therein and Peate et al (1997).…”

Section: Tectonomagmatic Significance Of Tholeiitic Basaltsmentioning

confidence: 99%

“…Data for back-arc basin basalts -BABB (shaded field) compiled from Wilson (1989) and references therein, Cousens et al (1994) and references therein, Pearce et al (1995), Gribble et al (1998) and Ewart et al (1998). Data for mid-ocean ridge basalts -MORB (solid line) compiled from Wilson (1989) and references therein and Cousens et al (1994), references therein and Peate et al (1997). Data for oceanic island arcs and active continental margins -IAB (broken line) compiled from Wilson (1989) and references therein, Cousens et al (1994) and references therein, Pearce et al (1995) and Peate et al (1997). oxide(s), caution is recommended concerning liability of clinopyroxene in paragenesis with spinel as a tectonomagmatic discriminatory tool.…”

Section: Tectonomagmatic Significance Of Tholeiitic Basaltsmentioning

confidence: 99%

Geochemistry, petrology and tectonomagmatic significance of basaltic rocks from the ophiolite mélange at the NW External-Internal Dinarides junction (Croatia)

Slovenec¹,

Lugović²,

Vlahović³

2010

Geologica Carpathica

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Abstract:At the NW inflexion of the Sava-Vardar Suture Zone ophiolite mélanges, known as the Kalnik Unit, form the surface of the slopes of several Pannonian inselbergs in the SW Zagorje-Mid-Transdanubian Zone. The Mt Samoborska Gora ophiolite mélange, thought to be a part of the Kalnik Unit, forms a separate sector obducted directly onto Dinaric Triassic carbonate sediments. Basaltic rocks, the only magmatic rocks incorporated in the mélange, include MiddleTriassic (Illyrian-Fassanian) alkali within-plate basalts and Middle Jurassic (uppermost Bathonian-Lower Callovian) tholeiitic basalts. The latter sporadically constitute composite olistoliths, and are geochemically divided into N-MORBlike (high-Ti basalts) and transitional MORB/IAT (medium-Ti basalts). These geochemically different rocks suggest crystallization at various tectonomagmatic settings, which is also indicated by the rock paragenesis and host clinopyroxene compositions. Alkali basalts reflect melts derived from an OIB-type enriched mantle source [Ti/V= 62.2-82.4; (La/Lu) cn = 6.4-12.8] with Nd-Sr isotope signatures close resembling the Bulk Earth [ε Nd(T=235 Ma) = + 1.6 to + 2.5]. They are recognized as preophiolite continental rift basin volcanic rocks that closely predate the opening of the Repno oceanic domain (ROD) of the Meliata-Maliac ocean system. The high-Ti and medium-Ti basalts from composite blocks derived from a similar depleted mantle source (ε Nd(T=165 Ma) =+ 6.01 vs. + 6.35) succesively metasomatized by expulsion of fluids from a subducting slab leading to a more pronounced subduction signature in the latter [Ti/V= 31.6-44.8 and (Nb/La) n = 0.67-0.90 vs. Ti/ V= 21.5-33.9 and (Nb/La) n = 0.32-0.49]. These composite blocks indicate crust formation in an extensional basin spreading over the still active subducting ridge. The majority of high-Ti basalts may represent the fragments of older crust formed at a spreading ridge and incorporated in the mélange of the accretionary wedge formed in the proto-arc-fore-arc region. The Mt Samoborska Gora ophiolite mélange represents the trailing edge of the Kalnik Unit as a discrete sector that records the shortest stage of tectonomagmatic evolution related to intraoceanic subduction in the ROD.

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Subduction-modified pelagic sediments as the enriched component in back-arc basalts from the Japan Sea: Ocean Drilling Program Sites 797 and 794

Cited by 116 publications

References 72 publications

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Trace element and Sr-Nd isotopic features of ultramafic xenoliths from Kurose, Southwest Japan

Geochemistry, petrology and tectonomagmatic significance of basaltic rocks from the ophiolite mélange at the NW External-Internal Dinarides junction (Croatia)

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