Seismic signature of a hydrous mantle transition zone
نویسندگان
چکیده
منابع مشابه
Radiative heat transfer in a hydrous mantle transition zone
The structure and dynamics of Earth’s interior depend crucially upon heat flow and thus upon the thermal conductivity of its constituents. We measured optical absorbance spectra of hydrous wadsleyite and hydrous ringwoodite at simultaneous high-pressure and high-temperature conditions up to 26 GPa and 823 K in order to determine their radiative conductivities and to study the potential thermal ...
متن کاملReactive infiltration of hydrous melt above the mantle transition zone
[1] Seismic studies repeatedly image a low‐velocity layer overlying the mantle transition zone in tectonic settings ranging from subduction zones to continental cratons. This layer has been hypothesized to result from the presence of a dense partial melt formed by dehydration melting as relatively wet transition zone material is advected by convection currents into the low‐water‐solubility uppe...
متن کاملThermal, hydrous, and mechanical states of the mantle transition zone beneath southern Africa
Observations of P-to-S conversions from the seismic discontinuities near 410 and 660 km depth reveal the shoaling of the 410-km discontinuity and the deepening of the 660-km discontinuity beneath the Archaean cratons in southern Africa; consequently, the mantle transition zone is 20 km thicker than beneath post-Archaean regions and the global average. The discontinuity structure, combined with ...
متن کاملHydrous upwelling across the mantle transition zone beneath the Afar Triple Junction
The mechanisms that drive the upwelling of chemical heterogeneity from the lower to upper mantle (e.g., thermal versus compositional buoyancy) are key to our understanding of whole mantle convective processes. We address these issues through a receiver function study on new seismic data from recent deployments located on the Afar Triple Junction, a location associated with deep mantle upwelling...
متن کاملSeismic imaging of transition zone discontinuities suggests hot mantle west of Hawaii.
The Hawaiian hotspot is often attributed to hot material rising from depth in the mantle, but efforts to detect a thermal plume seismically have been inconclusive. To investigate pertinent thermal anomalies, we imaged with inverse scattering of SS waves the depths to seismic discontinuities below the Central Pacific, which we explain with olivine and garnet transitions in a pyrolitic mantle. Th...
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ژورنال
عنوان ژورنال: Physics of the Earth and Planetary Interiors
سال: 2016
ISSN: 0031-9201
DOI: 10.1016/j.pepi.2015.11.005