Results 11 to 20 of about 4,939,312 (268)
Deformation-Induced Mechanical Instabilities at the Core-Mantle Boundary [PDF]
, 2007 Post-Perovskite: The Last Mantle Phase Transition Our understanding of the core-mantle boundary (CMB) region has improved significantly over the past several years due, in part, to the discovery of the post-perovskite phase.
Petford, Nick +2 more
core +10 more sources
Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle [PDF]
, 1991 This thesis is an investigation of the changes in the magnetic field as measured at the surface of the Earth on the time-scale of months to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated.
Stewart, Douglas Norman
core +7 more sources
Shear-induced material transfer across the core-mantle boundary aided by the post-perovskite phase transition [PDF]
, 2005 We present a novel mechanical model for the extraction of outer core material upwards across the CMB into the mantle side region of D" and subsequent interaction with the post-perovskite (ppv) phase transition.
Brodholt, John +4 more
core +10 more sources
Narrow, Fast, and “Cool” Mantle Plumes Caused by Strain‐Weakening Rheology in Earth's Lower Mantle
Geochemistry, Geophysics, Geosystems, 2022 The rheological properties of Earth's lower mantle are key for mantle dynamics and planetary evolution. The main rock‐forming minerals in the lower mantle are bridgmanite (Br) and smaller amounts of ferropericlase (Fp).
A. J. P. Gülcher +4 more
doaj +1 more source
Earth, Planets and Space, 2022 The influence of composition-dependent thermal conductivity and heterogeneous internal heating of primordial dense material on the long-term evolution of primordial reservoirs in the lower mantle of the Earth is investigated utilizing thermochemical ...
Yang Li +6 more
doaj +1 more source
Coupled Evolution of Plate Tectonics and Basal Mantle Structure
Geochemistry, Geophysics, Geosystems, 2021 The relationships between plate motions and basal mantle structure remain poorly understood, with some models implying that the basal mantle structure has remained stable over time, while others suggest that it could be shaped by the aggregation and ...
Xianzhi Cao +2 more
doaj +1 more source
Earth and Planetary Physics, 2019 The thermal structure of the lower mantle plays a key role in understanding the dynamic processes of the Earth's evolution and mantle convection. Because intrinsic attenuation in the lower mantle is highly sensitive to temperature, determining of the ...
BaoLong Zhang, SiDao Ni, YuLin Chen
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2020 Large low‐velocity provinces (LLVPs) are hypothesized to be purely thermal features or possess some chemical heterogeneity but which exactly remains ambiguous.
Jamie Ward, Andy Nowacki, Sebastian Rost
doaj +1 more source
A Role for Subducted Oceanic Crust in Generating the Depleted Mid‐Ocean Ridge Basalt Mantle
Geochemistry, Geophysics, Geosystems, 2020 The composition of Earth's mantle, continental crust, and oceanic crust continuously evolve in response to the dynamic forces of plate tectonics and mantle convection.
Jonathan M. Tucker +3 more
doaj +1 more source
Investigating the D" Reflector Beneath the Indian Ocean with Source Arrays
SeismicaWe used seismic P-wave reflections to search for the discontinuity at the top of the D" region beneath the Indian Ocean. Due to a lack of seismic receiver arrays to target this region, we build source arrays using earthquakes in Indonesia and taking ...
Christine Thomas +3 more
doaj +1 more source