Transition Zone and Lower Mantle
Garnet-controlled very low velocities in the lower mantle transition zone at sites of mantle upwelling.
... Deep mantle plumes and associated increased geotherms are expected to cause an upward deflection of the lower–upper mantle boundary and an overall thinning of the mantle transition ...
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Carbonated mantle domains at the base of the Earth's transition zone
... upper mantle is 3-4 orders of magnitude higher than that of the lower mantle and this has been attributed to Fe 2+ disproportionating into Fe 3+ plus Fe 0 at pressures greater than 24 ...upper ...
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Interaction of the Cyprus/Tethys slab with the mantle transition zone beneath Anatolia
... upper mantle beneath Anatolia (Fichtner et ...upper mantle above the 410 along the S-leg of the P-to-S ...ringwoodite transition. We also observe a lower amplitude positive arrival at 75–85 s, ...
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Dynamical modeling of trench retreat driven by the slab interaction with the mantle transition zone
... Nevertheless, the slab penetrates into the lower mantle. The positive and negative buoyancies at the two phase transi- tions generate an anticlockwise torque on the slab. This en- hances trench retreat so ...
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Mantle transition zone structure beneath India and Western China from migration of PP and SS precursors
... the mantle transition zone, beneath ...phase transition which could possibly be caused by the presence of MORB material due to segregated oceanic crust beneath Tibet, forming a neutrally ...
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Interaction of subducted slabs with the mantle transition-zone: A regime diagram from 2-D thermo-mechanical models with a mobile trench and an overriding plate
... slab-transition zone interaction modes, in a self- consistent thermo-mechanical system, with a freely moving trench and an overriding ...upper-lower mantle transition is represented by ...
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Multiple mantle upwellings in the transition zone beneath the northern East African Rift system from relative P wave travel time tomography
... Abstract Mantle plumes and consequent plate extension have been invoked as the likely cause of East African Rift ...of mantle upwelling is debated, with proposed configurations ranging from a single broad ...
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Layered crustal and mantle structure and anisotropy beneath the Afar Depression and Malawi Rift Zone
... thicker-than-normal transition zone is most commonly attributed to the passage of lower-temperature subducting slabs, anomalous hydration associated with ongoing or relict slabs, or to the upwelling ...
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Hydrogen in the Nominally Anhydrous Phases and Possible Hydrous Phases in the. Lower Mantle. Huawei Chen
... lithospheric mantle. Furthermore, if the mantle tran- sition zone is hydrated globally, the transport of such hydrated minerals across the 660-km discontinuity by convective mantle flow away ...
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Triplicated P-wave measurements for waveform tomography of the mantle transition zone
... are lower than what we obtain for teleseismic P-waves, but are still sufficient to assemble two decently sized tomography data sets for North America and ...to transition zone structure, and in ...
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CiteSeerX — Global transition zone tomography
... example, the high dV s anomaly at 1075 km depth beneath Indonesia is not a result of ‘‘vertical smearing’’ of higher- velocity structure in shallower regions of the upper mantle. The Backus-Gilbert kernel computed ...
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Evolution of a polymineralic mantle shear zone and the role of second phases in the localization of deformation
... even lower temperatures (∼700°C), the volume proportion of the poly- mineralic layers further increases in the ...plastic transition in olivine that occurs between 600°C [Jaroslow et ...
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Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography
... upper mantle from 70 km down to 350 km in the study ...a transition between the higher and lower seis- mic velocities, which was discussed ...
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Determination of the absolute depths of the mantle transition zone discontinuities beneath China: Effect of stagnant slabs on transition zone discontinuities
... the mantle discontinuities beneath a ...a mantle discontinuity determined in previous studies depends on the reference ...the transition zone of the same ...the mantle transition ...
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CiteSeerX — Structure of the Core- Mantle Transition Zone: A Chemical and Thermal Boundary Layer
... Establishing the thermal and chemical structure of the lowermost mantle and outermost core is critical to our understanding of the dynamic processes near this transition zone, and prog[r] ...
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Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction
... deep mantle source likely ...that mantle plumes maybe more complex than previ- ously thought, and that in some regions are likely driven by differences in composition rather than tempera- ture ...how ...
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Seismic structure of the lower mantle
... Current tomographic models of the Earth display perturbations to a radial stratified reference model. However, structures in the deep mantle that are chemically dense with low Rayleigh numbers can develop enormous ...
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Seismic evidence for a mantle transition zone origin of the Wudalianchi and Halaha volcanoes in Northeast China
... (2018) Seismic evidence for a mantle transition zone origin of the Wudalianchi and Halaha volcanoes in Northeast China.. (In Press).[r] ...
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The lithospheric mantle and lower crust mantle relationships under Scotland: a xenolithic perspective
... (2011) The lithospheric mantle and lower crust- mantle relationships under Scotland: a xenolithic perspective.. ISSN 0016-7649.[r] ...
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SiO2 glass density to lower mantle pressures
... /Abstract/ The convection or settling of matter in the deep Earth’s interior is mostly constrained by density variations between the different reservoirs. Knowledge of the density contrast between solid and molten ...
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