Sediment incorporation in island-arc magmas: Inferences from 10Be

Tera, F.; Brown, Leanne; Morris, Julie; Sacks, I. Selwyn; Klein, J.; Middleton, R.

doi:10.1016/0016-7037(86)90103-1

Cited by 341 publications

(151 citation statements)

References 43 publications

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“…(1) 1°Be has been used to trace the cycling of ocean floor sediments at convergent tectonic plates (island arc volcanic rocks; e.g., [56,57]). The influence of boundary scavenging on the deposition of 1°Be in the specific areas of the ocean margins should be well understood before l°Be can be used to model the amount of sediment that was incorporated in the magmatic process accurately.…”

Section: Discussionmentioning

confidence: 99%

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Lao

Anderson

Broecker

et al. 1992

Earth and Planetary Science Letters

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Section: Discussionmentioning

confidence: 99%

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Lao

Anderson

Broecker

et al. 1992

Earth and Planetary Science Letters

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“…Talc that forms on the ocean floor by hydrothermal alteration will react with forsterite to form antigorite and enstatite. Since there is an excess of forsterite compared to talc in ultramafic oceanic lithosphere, talc will not be carried beyond -• 2.5 GPa pressure unless talc is in the sedimentary pile riding atop the subducted slab (where there is limited forsterite) and is carried to greater depths as suggested by the •øBe/9Be ratio of mineral separates of arc magmas [Tera, 1986;Morris and Tera, 1989]. Under those conditions, talc will be stable to -• 5 GPa, until the reaction talc = enstatite + SiO: + H:O is encountered.…”

Section: Equation Of Statementioning

confidence: 99%

Thermochemistry and phase equilibria of hydrous phases in the system MgO‐SiO₂‐H₂O: Implications for volatile transport to the mantle

Bose

Navrotsky

1998

J. Geophys. Res.

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Abstract. Calorimetric, phase equilibrium and in situ equation of state data for antigorite, talc, and dense hydrous magnesium silicate (DHMS) phases have been obtained to construct a selfconsistent thermodynamic data set that ensures internal consistency, well-behaved extrapolation and physically reasonable values of AH ø, S ø, V ø, K, K' and a for talc, antigorite, and hydrous phase A. Used in conjunction with temperature profiles of subducting oceanic lithosphere, the calculated phase equilibria show that there is no barrier to subducting substantial amounts of water to depth of 400-600 km in colder slabs, since the slab can remain in the stability field of hydrous phases throughout its descent. Once water is brought to these depths, it can probably diffuse into hotter mantle regions via hydrous [3-Mg2SiO 4 or by other mechanisms, indicating that the transition zone is unlikely to be dry.

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“…Geochemical and petrological evidence suggest that subducted components (slab 2 sediment) mix with mantle peridotite in deep-seated portions of active subduction zones (Wyllie, 1979(Wyllie, , 1982Kay, 1980;Wyllie & Sekine, 1982;Tera, Brown, Morris, Sacks, Klein & Middleton, 1986). Mass transfer from slab to peridotite is probably accomplished by fluids and melts (e.g.…”

Section: Introductionmentioning

confidence: 99%

Petrology of amphibolite‐facies mafic and ultramafic rocks from the Catalina Schist, southern California: metasomatism and migmatization in a subduction zone metamorphic setting

Sorensen

1988

Journal Metamorphic Geology

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Abstract. The Catalina Schist of southern Cali-INTRODUCTION fornia is a subduction zone metamorphic terrane. It consists of three tectonic units of amphibolite-, high-P greenschist-and blueschist-facies rocks that are structurally juxtaposed across faults, forming an apparent inverted metamorphic gradient.Migmatitic and non-migmatitic metabasite blocks surrounded by a meta-ultramafic matrix comprise the upper part of the Catalina amphibolite unit. Fluid-rock interaction at high-P, high-T conditions caused partial melting of migmatitic blocks, metasomatic exchange between metabasite blocks and ultramafic rocks, infiltration of silica into ultramafic rocks, and loss of an albitic component from nonmigmatitic, clinopyroxene-bearing metabasite blocks.Partial melting took place at an estimated P = -8-11 kbar and T = -640-750°C at high H 2 0 activity. The melting reaction probably involved plagioclase + quartz. Trondhjemitic melts were produced and are preserved as leucocratic regions in migmatitic blocks and as pegmatitic dikes that cut ultramafic rocks.The metasomatic and melting processes reflected in these rocks could be analogous to those proposed for fluid and melt transfer of components from a subducting slab to the mantle wedge. Aqueous fluids rather than melts seem to have accomplished the bulk of mass transfer within the mafic and ultramafic complex.Geochemical and petrological evidence suggest that subducted components (slab 2 sediment) mix with mantle peridotite in deep-seated portions of active subduction zones (

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Sediment incorporation in island-arc magmas: Inferences from 10Be

Cited by 341 publications

References 43 publications

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Thermochemistry and phase equilibria of hydrous phases in the system MgO‐SiO₂‐H₂O: Implications for volatile transport to the mantle

Petrology of amphibolite‐facies mafic and ultramafic rocks from the Catalina Schist, southern California: metasomatism and migmatization in a subduction zone metamorphic setting

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Sediment incorporation in island-arc magmas: Inferences from 10Be

Cited by 341 publications

References 43 publications

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Transport and burial rates of10Be and231Pa in the Pacific Ocean during the Holocene period

Thermochemistry and phase equilibria of hydrous phases in the system MgO‐SiO2‐H2O: Implications for volatile transport to the mantle

Petrology of amphibolite‐facies mafic and ultramafic rocks from the Catalina Schist, southern California: metasomatism and migmatization in a subduction zone metamorphic setting

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Thermochemistry and phase equilibria of hydrous phases in the system MgO‐SiO₂‐H₂O: Implications for volatile transport to the mantle