Emerging geothermometers for estimating slab surface temperatures

Plank, Terry; Cooper, Lauren B.; Manning, Craig E.

doi:10.1038/ngeo614

Cited by 207 publications

(147 citation statements)

References 37 publications

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“…These predicted temperatures are higher than the solidus. Vice versa, if temperatures lower than the solidus are needed to explain our data (i.e., temperature lower than 650 to 700°C, after Schmidt and Poli 1998), then the measured H 2 O/Ce values of the three most water-rich melt inclusions (7,600, 6,600, and 3,600, respectively) are much lower than the predicted H 2 O/Ce ratio of aqueous fluid (10 5 to 10 6 , Plank et al 2009). Therefore, we conclude that metasomatism of subarc mantle by aqueous fluid, is in disaccord with melt forming temperature inferred from H 2 O/Ce.…”

Section: Low Slab Surface Temperaturementioning

confidence: 74%

“…Similarly, crystal fractionation can increase Ce concentration. While these Iwate melt inclusions hosted in olivine are glassy and sampled from scoria, they may have somehow failed to retain the H 2 O and Ce source character predicted by the thermometer of Plank et al (2009). Geochemical indicators involving highly volatile elements, such as H 2 O/Ce, may in fact be applicable to a limited number of samples that can meet stringent criteria proving non-degassing.…”

Section: Low Slab Surface Temperaturementioning

confidence: 99%

“…It must be lower than the melting point of subducted oceanic crust (650 to 700°C after Schmidt and Poli 1998). A recently developed slab surface thermometer (Plank et al 2009) is applied to these melt inclusions using H 2 O/Ce ratio. For the melt inclusions with the highest H 2 O concentrations (2.9 wt% in ITM12 and IEM35 and 3.7 wt% in IEM28.1), H 2 O/Ce values predict 720, 740, and 790°C slab surface temperatures, respectively.…”

Section: Low Slab Surface Temperaturementioning

confidence: 99%

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Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

et al. 2014

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Investigation of olivine-hosted melt inclusions provides information about the abundance of volatile elements that are often lost during subaerial eruptions of lavas. We have measured the abundances of H 2 O, CO 2 , F, Cl, and S as well as Pb isotopes in 29 melt inclusions in the scoria of the 1686 eruption of the Iwate volcano, a frontal-arc volcano in the northeast Japan arc. Pb Isotope compositions identify that Iwate magma is derived from a mixture of depleted mantle, subducted basalt, and sediment. Systematics of F in comparison to MORB and other arc magma indicates that (1) the slab surface temperature must be among the lowest on Earth and (2) hydrous minerals, such as amphibole, humites, and/or mica, must be present as residual phases during the dehydration of the slab.

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Section: Low Slab Surface Temperaturementioning

confidence: 74%

Section: Low Slab Surface Temperaturementioning

confidence: 99%

Section: Low Slab Surface Temperaturementioning

confidence: 99%

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Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

et al. 2014

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“…Dehydration of crustal rocks becomes prominent during their cold subduction to the subarc depths, where these rocks may be heated to 730 to 950°C at the slab-mantle interface (Hermann and Spandler 2008;Plank et al 2009;Syracuse et al 2010;Cooper et al 2012). This also results in local dehydration melting, which is recorded by anatectic leucosomes, restites, and MSI in UHP metamorphic rocks (Zheng et al 2011a;Gao et al 2012Gao et al , 2013Chen et al 2012bChen et al , 2013Yu et al 2012;Liu et al 2013;Song et al 2014;Stepanov et al 2014).…”

Section: Crust-mantle Interaction In Subduction Channelmentioning

confidence: 99%

Geochemistry of continental subduction-zone fluids

2014

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The composition of continental subduction-zone fluids varies dramatically from dilute aqueous solutions at subsolidus conditions to hydrous silicate melts at supersolidus conditions, with variable concentrations of fluid-mobile incompatible trace elements. At ultrahigh-pressure (UHP) metamorphic conditions, supercritical fluids may occur with variable compositions. The water component of these fluids primarily derives from structural hydroxyl and molecular water in hydrous and nominally anhydrous minerals at UHP conditions. While the breakdown of hydrous minerals is the predominant water source for fluid activity in the subduction factory, water released from nominally anhydrous minerals provides an additional water source. These different sources of water may accumulate to induce partial melting of UHP metamorphic rocks on and above their wet solidii. Silica is the dominant solute in the deep fluids, followed by aluminum and alkalis. Trace element abundances are low in metamorphic fluids at subsolidus conditions, but become significantly elevated in anatectic melts at supersolidus conditions. The compositions of dissolved and residual minerals are a function of pressure-temperature and whole-rock composition, which exert a strong control on the trace element signature of liberated fluids. The trace element patterns of migmatic leucosomes in UHP rocks and multiphase solid inclusions in UHP minerals exhibit strong enrichment of large ion lithophile elements (LILE) and moderate enrichment of light rare earth elements (LREE) but depletion of high field strength elements (HFSE) and heavy rare earth elements (HREE), demonstrating their crystallization from anatectic melts of crustal protoliths. Interaction of the anatectic melts with the mantle wedge peridotite leads to modal metasomatism with the generation of new mineral phases as well as cryptic metasomatism that is only manifested by the enrichment of fluid-mobile incompatible trace elements in orogenic peridotites. Partial melting of the metasomatic mantle domains gives rise to a variety of mafic igneous rocks in collisional orogens and their adjacent active continental margins. The study of such metasomatic processes and products is of great importance to understanding of the mass transfer at the slab-mantle interface in subduction channels. Therefore, the property and behavior of subduction-zone fluids are a key for understanding of the crust-mantle interaction at convergent plate margins.

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“…'Slab diapirs', or thermochemical slab plumes, are mechanical mixtures of hydrous mantle and partially molten basalts and sediments (Gerya et al 2004) that may detach buoyantly from the slab and rise into the hot core of the mantle wedge (Gerya & Yuen 2003;Behn et al 2011;Marschall & Schumacher 2012), and that may 'relaminate' to the base of the overriding crust . Recent experimental data suggest that melting of the slab and diapirism may be the rule rather than the exception beneath arc front depths in most subduction zones (Hermann & Spandler 2008;Klimm et al 2008;Plank et al 2009;Behn et al 2011), and either mechanism can produce melts that strongly resemble andesitic arc magmas and that may add to arc crustal growth (Castro et al 2013;Behn et al 2011; and see also Gómez-Tuena et al 2013). Thus, the simplest concept is that andesite arc crust grows through addition of such slab components that may or may not be additionally modified in the mantle wedge (Ringwood 1974).…”

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confidence: 99%

An introduction to orogenic andesites and crustal growth

Gómez-Tuena

Straub

Zellmer

2013

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This chapter provides an overview of the current state of research on orogenic andesites. While their importance as proxies to the evolution of the continental crust has long been recognized, andesite genesis has remained highly controversial with a broader consensus yet to be reached. The controversy is fuelled by the question of whether orogenic andesites are primary melts of slab and mantle materials, or instead derivative products of basaltic mantle melts that differentiate in the overlying crust. These hypotheses are addressed in three sections of the book devoted to slab-mantle processes, the complexities of melt differentiation at crustal levels, and models pertaining to arc crustal growth. We believe that cross-fertilization and discussion among seemingly opposite and irreconcilable hypotheses will smooth the pathway towards a holistic communal model of andesite petrogenesis.Among the terrestrial planets, an andesitic continental crust is unique to Earth. Representing only c.

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Emerging geothermometers for estimating slab surface temperatures

Cited by 207 publications

References 37 publications

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

Volatile (F and Cl) concentrations in Iwate olivine-hosted melt inclusions indicating low-temperature subduction

Geochemistry of continental subduction-zone fluids

An introduction to orogenic andesites and crustal growth

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