Stagnant slab, wet plumes and Cenozoic volcanism in East Asia

Richard, Guillaume; Iwamori, Hikaru

doi:10.1016/j.pepi.2010.02.009

Cited by 105 publications

(62 citation statements)

References 40 publications

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“…This study suggests that oxygen isotopes, 39 Ar/ 40 Ar ages, and other geochemical features of the Chifeng CFBs of East Asia are correlated with distance to the western edge of the stagnant Pacific slab within the MTZ. We demonstrate that the lavas immediately above the western edge of the stagnant Pacific slab are characterized by being oversaturated in silica, having the oldest eruptive ages, the lowest olivine d 18 O values and possibly the highest fluid contents.…”

mentioning

confidence: 72%

“…This model is mainly based on the strong spatial correlation of geochemical features with distance of eruptive lavas relative to the edge of the stagnant slab. This is based on water partitioning in the Earth's mantle 18 , behaviour of slab-triggered wet upwelling and upward percolation 23,40 , hydrous mantle melting 51 , the mantle wedge model 21 , and upwelling from the hydrated mantle transition zone 24 . rocks from the Siberia 9 and Karoo 7 LIPs show that crustal contamination cannot be the controlling factor. Detailed geochemical and isotopic analyses of basaltic rocks from the Siberia 9 , Karoo 7 and Central Atlantic 6 LIPs demonstrate that their generations involved water and possibly other fluid phases released from subducted slabs and that their source reservoirs were both isolated and hydrated over a considerable period of time.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the potential matrix effect need not be considered further. 40 Ar/ 39 Ar analysis. Twelve groundmass samples were dated using the stepheating 40 Ar/ 39 Ar method (Supplementary Dataset 4).…”

Section: Methodsmentioning

confidence: 99%

“…The most striking observation is that oxygen isotopes, 39 Ar/ 40 Ar ages, and other geochemical features of the Chifeng CFBs (SiO 2 , Nb, Sm/Nd, Ce/Pb, K/Ce, Tb/Yb and Sr/Ce) are correlated with distance to the western edge of the stagnant Pacific slab ( Fig. 2; Supplementary Fig.…”

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 95%

“…This is consistent with the coexistence of low Ce/Pb and normal olivine d 18 O values (B5.0%) in individual samples. Direct or indirect contribution from stagnant slabs therefore significantly affects the upper mantle thermochemical state and has played an important role in generating the Chifeng CFBs 23,40 .…”

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 99%

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Continental flood basalts derived from the hydrous mantle transition zone

et al. 2015

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confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 95%

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 99%

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Continental flood basalts derived from the hydrous mantle transition zone

et al. 2015

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The role of harzburgite layers in the morphology of subducting plates and the behavior of oceanic crustal layers

Yoshida

2013

Geophysical Research Letters

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[1] Numerical simulations of mantle convection with semidynamic plate subduction in 3-D geometry is performed to investigate the role of harzburgite layers in the morphology of subducting plates and the behavior of oceanic crustal layers. The results show that a "buckled" crustal layer is observed under the "heel" of the stagnant slab that begins to penetrate into the lower mantle, regardless of the magnitude of the viscosity of the harzburgite layer, Δη hrz , when the factor of viscosity increase at the boundary of the upper and lower mantle, Δη lm , is larger than 60-100. As Δη hrz increases, the curvature of buckling is larger. When Δη lm and Δη hrz are larger, the volumes of crustal and harzburgite materials trapped in the mantle transition zone (MTZ) are also larger, although almost all of the materials penetrate into the lower mantle. These materials are trapped in the MTZ for over tens of millions of years. Citation: Yoshida, M. (2013), The role of harzburgite layers in the morphology of subducting plates and the behavior of oceanic crustal layers, Geophys. Res. Lett., 40,[5387][5388][5389][5390][5391][5392]

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Hydration adjacent to a deeply subducting slab: The roles of nominally anhydrous minerals and migrating fluids

Hebert

Montési

2013

JGR Solid Earth

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[1] Subduction-related transport of water into the mantle has significant dynamical and geochemical implications. Dehydration of hydrous phases within the slab can introduce water into the transition zone and lower mantle, potentially hydrating nominally anhydrous minerals (NAM) and impacting the viscosity and density structure of the mantle over a wide area. We present models of fluid transport and mantle hydration in the vicinity of a deeply subducting slab, focusing on the fate of water released by deep dehydration reaction in the subducted serpentinized mantle. A sharp decrease in water storage capacity across the lower boundary of the transition zone may produce "secondary dehydration" of hydrated NAM, leading to precipitation of a hydrous fluid and heterogeneous hydration of the transition zone. Rapid fluid migration relative to the solid flow field can lead to a broad region of diffuse hydration within the upper mantle wedge and the potential for localized melt regions at the top of the transition zone coincident with fluid pathways. Slower fluid migration instead implies that the fluid phase can be transported deep into the lower mantle. Water stabilized in NAM and as a free fluid can initiate upwelling within and above the transition zone. A less abrupt change in water storage capacity across the base of the transition zone leads to high NAM water contents in a channel adjacent to the slab where viscosity is reduced. However, seismic and electromagnetic observations of hydration in the transition zone are most compatible with a sudden drop of water storage capacity.Citation: Hebert, L. B., and L. G. J. Monte´si (2013), Hydration adjacent to a deeply subducting slab: The roles of nominally anhydrous minerals and migrating fluids,

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Stagnant slab, wet plumes and Cenozoic volcanism in East Asia

Cited by 105 publications

References 40 publications

Continental flood basalts derived from the hydrous mantle transition zone

Continental flood basalts derived from the hydrous mantle transition zone

The role of harzburgite layers in the morphology of subducting plates and the behavior of oceanic crustal layers

Hydration adjacent to a deeply subducting slab: The roles of nominally anhydrous minerals and migrating fluids

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