Fluid-metapelite interaction in an ultramafic mélange: implications for mass transfer along the slab-mantle interface in subduction zones
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چکیده
منابع مشابه
Metamorphic evolution along the slab/ mantle interface within subduction zones
One view of the metamorphic subduction system supposes that coupled deformation and prograde/metasomatic reaction between the chemically enriched slab and the depleted mantle wedge promotes the formation of complexly hybridized lithologies along the slab/mantle interface. This type of model is based upon direct observations of the structure and petrology of high-P/T metamorphic complexes (e.g.,...
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We present major and trace element concentrations in conjunction with Sr–Nd isotope ratios to investigate the geochemical characteristics of mélange formation along the subduction zone slab–mantle interface. Mélange matrix of the Catalina Schist formed within an active subduction zone of the southern California borderland in Cretaceous time. Mélange formed through the synergistic effects of def...
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Subduction systems are vitally important to plate tectonics and mantle convection, but questions remain about many aspects of subduction dynamics, particularly the nature of sub-slab mantle flow. Observations of seismic anisotropy can shed light on the pattern of mantle flow in subduction systems, but major uncertainties remain regarding the interpretation of sub-slab anisotropy. Here, we prese...
متن کاملMid-mantle anisotropy in subduction zones and deep water transport
The Earth’s transition zone has until recently been assumed to be seismically isotropic. Increasingly, however, evidence suggests that ordering of material over seismic wavelengths occurs there, but it is unclear what causes this. We use the method of source-side shear wave splitting to examine the anisotropy surrounding earthquakes deeper than 200 km in slabs around the globe. We find signific...
متن کامل28 Investigating Upper Mantle Discontinuities Beneath Subduction Zones
Subduction zones can be regarded as natural laboratories because of the wide variety of processes involved. Macquarie Island is an exposed portion of the Macquarie Ridge, and is located where the Australian plate meets the Pacific plate. To its north is the Tonga trench, where the old Pacific floor subducts at a rapid rate below the Indo-Australia plate, producing a deep slab of former oceanic ...
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ژورنال
عنوان ژورنال: Earth, Planets and Space
سال: 2014
ISSN: 1880-5981
DOI: 10.1186/1880-5981-66-47