Journal ArticleDOI
Diapiric Flow at Subduction Zones: A Recipe for Rapid Transport
P. S. Hall,Chris Kincaid +1 more
TLDR
Results indicate that the interaction between buoyantly upwelling diapirs and subduction-induced flow in the mantle creates a network of low-density, low-viscosity conduits through which buoyant flow is rapid, yielding transport times commensurate with those indicated by uranium-thorium studies.Abstract:
Recent geochemical studies of uranium-thorium series disequilibrium in rocks from subduction zones require magmas to be transported through the mantle from just above the subducting slab to the surface in as little as ∼30,000 years. We present a series of laboratory experiments that investigate the characteristic time scales and flow patterns of the diapiric upwelling model of subduction zone magmatism. Results indicate that the interaction between buoyantly upwelling diapirs and subduction-induced flow in the mantle creates a network of low-density, low-viscosity conduits through which buoyant flow is rapid, yielding transport times commensurate with those indicated by uranium-thorium studies.read more
Citations
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Journal ArticleDOI
The chemistry of subduction-zone fluids
TL;DR: In this paper, it was shown that H2O-rich, Cl-poor, alkali-aluminosilicate-bearing fluid is fundamental to element transport in the mantle wedge.
Journal ArticleDOI
Control of nanoparticle location in block copolymers.
TL;DR: A simple procedure is described to incorporate gold nanoparticles and control their location within symmetric poly(styrene-b-2 vinyl pyridine) (PS-PVP) diblock copolymers.
Journal ArticleDOI
Rayleigh^Taylor instabilities from hydration and melting propel 'cold plumes' at subduction zones
TL;DR: In this paper, the authors numerically modeled this parodoxically interesting geological phenomenon, in which rising diapiric structures, colder than the asthenosphere by 300-400°C, are driven upward by compositional buoyancy, with a high-resolution two-dimensional regional model.
Journal ArticleDOI
Size-Selective Organization of Enthalpic Compatibilized Nanocrystals in Ternary Block Copolymer/Particle Mixtures
TL;DR: In ternary systems consisting of block copolymer and two different-sized nanocrystal species, the distinct morphological types are conserved, resulting in autonomous size-selective separation and organization of the respective nanocrystals within alternating arrays and sheets.
Journal ArticleDOI
The Role of H 2 O in Subduction Zone Magmatism
Timothy L. Grove,Christy B. Till,Christy B. Till,Michael J. Krawczynski,Michael J. Krawczynski +4 more
TL;DR: In this paper, the role of water in the generation of magmas in the mantle wedge, the factors that allow melting to occur, and the plate tectonic variables controlling the location of arc volcanoes worldwide.
References
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Journal ArticleDOI
The Volume and Composition of Melt Generated by Extension of the Lithosphere
Dan McKenzie,Mike J. Bickle +1 more
Journal ArticleDOI
Water in the oceanic upper mantle: implications for rheology, melt extraction and the evolution of the lithosphere
Greg Hirth,David L. Kohlstedt +1 more
TL;DR: In this paper, the influence of water on the dynamics of the oceanic upper mantle is re-evaluated based on recent experimental constraints on the solubility of water in mantle minerals and earlier experimental studies of olivine rheology.
Journal ArticleDOI
Geochemical and geodynamical constraints on subduction zone magmatism
TL;DR: In this article, a quantitative model has been developed for IAB petrogenesis with the transfer of trace elements from the slab to the mantle wedge being modelled with empirical slab-fluid partition coefficients whilst the mantlewedge to arc-crust transfer is constrained by melt-solid partitioning.
Journal ArticleDOI
Element transport from slab to volcanic front at the Mariana arc
TL;DR: Agarwal et al. as mentioned in this paper presented a comprehensive geochemical data set for the most recent volcanics from the Mariana Islands, which provides new constraints on the timing and nature of fluxes from the subducting slab.
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