Hot fingers in the mantle wedge: new insights into magma genesis in subduction zones

Tamura, Yoshihiko; Tatsumi, Yoshiyuki; Zhao, Dapeng; Kido, Yukari; Shukuno, H.

doi:10.1016/s0012-821x(02)00465-x

Cited by 280 publications

(287 citation statements)

References 21 publications

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“…Tamura et al [Tamura et al, 2001] have proposed that groups of volcanoes in NE Japan are underlain by low velocity anomalies as described in the preceding paragraph, with an along strike extent of 50-100 km, separated by regions with higher seismic velocity in the uppermost mantle. They suggest that this is a result of three-dimensional mantle convection in the wedge, perhaps due to transient diapirs.…”

Section: Seismic Constraints On Melt Distribution In the Uppermost Mamentioning

confidence: 97%

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

Kelemen

Rilling

Parmentier

et al. 2003

Inside the Subduction Factory

186

177

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We summarize petrological and seismic constraints on the temperature of arc lower crust and shallow mantle, and show that published thermal models are inconsistent with these constraints. We then present thermal models incorporating temperature-dependent viscosity, using widely accepted values for activation energy and asthenospheric viscosity. These produce thin thermal boundary layers in the wedge corner, and an overall thermal structure that is consistent with other temperature constraints. Some of these models predict partial melting of subducted sediment and/or basalt, even though we did not incorporate the effect of shear heating We obtain these results for subduction of 50 Myr old oceanic crust at 60 km/Myr, and even for subduction of 80 Myr old crust at 80 km/Myr, suggesting that melting of subducted crust may not be not restricted to slow subduction of young oceanic crust.

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Section: Seismic Constraints On Melt Distribution In the Uppermost Mamentioning

confidence: 97%

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

Kelemen

Rilling

Parmentier

et al. 2003

Inside the Subduction Factory

186

177

View full text Add to dashboard Cite

show abstract

“…Additionally, strong isometric isolated positive V p attenuation anomalies enveloped within a region characterized by a negative V p attenuation anomaly have been observed above the descending slab [e.g., Schurr et al, 2003]. These structures are interpreted as thermal [Tamura et al, 2002] or chemical [Gerya and Yuen, 2003a] anomalies, but the distribution and evolution of these anomalies is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

Gorczyk

Gerya

Connolly

et al. 2006

Geochem Geophys Geosyst

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[1] Using a combined finite difference and marker-in-cell technique, we performed two-dimensional coupled petrological-thermomechanical numerical simulations of intraoceanic subduction. The simulations indicate that parts of the mantle wedge can become trapped between rheologically weak, hydrated, and partially molten upwellings (cold plumes) and the subducting slab. The structures form at various depths and develop circular, elliptic, or irregular shapes. The combined effect of the tractions caused by upwelling and subduction causes these regions to rotate. Our simulations investigate the parameters controlling the occurrence and long-term stability of such rigid, rotating structures. Circular rotating structures like ''subduction wheels'' are characteristic of models with relatively young (20-30 Myr) slabs and intermediate (2-5 cm/yr) subduction rates. We propose that the development of such circular features may explain some of the isolated seismic velocity anomalies in the mantle wedge.

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“…These so-called hot fingers are the locally developed hot regions within the mantle wedge of subduction zone that have a shape of 50-km-wide inclined finger. Above these, Quaternary volcanoes in Northeast Japan form 10 clusters (Tamura et al 2002).…”

Section: Hijiori Volcanomentioning

confidence: 99%

“…The pumice fragments (Tamura et al 2002) being essential (magmatic) material (Miyagi 2007) were targeted for sampling and analysis. These fragments sometimes contain matrix glass and phenocrysts of plagioclase, quartz, hornblende, orthopyroxene, magnetite, and ilmenite.…”

Section: Petrographymentioning

confidence: 99%

The geochemical and petrological characteristics of prenatal caldera volcano: a case of the newly formed small dacitic caldera, Hijiori, Northeast Japan

Miyagi

Kita

Morishita

2017

Contrib Mineral Petrol

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melt water contents found in quartz-hosted melt inclusions (2-9 wt%) suggests the range of depth phenocrysts growth to be wide (2∼13 km). Our data suggest the presence of a vertically elongated magma chamber whose top is nearly solidified but highly vesiculated; this chamber has probably grown and re-mobilized by repeated injections of a small amount of hot dacitic magma originated from the depth.

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Hot fingers in the mantle wedge: new insights into magma genesis in subduction zones

Cited by 280 publications

References 21 publications

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

Thermal structure due to solid-state flow in the mantle wedge beneath arcs

Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

The geochemical and petrological characteristics of prenatal caldera volcano: a case of the newly formed small dacitic caldera, Hijiori, Northeast Japan

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