Compositional heterogeneity in the mantle transition zone
Earth's mantle transition zone (MTZ) is characterized by several sharp increases in seismic
wave speed between~ 300 km and~ 850 km depth. These seismic discontinuities are …
wave speed between~ 300 km and~ 850 km depth. These seismic discontinuities are …
Slab control on the mega-sized North Pacific ultra-low velocity zone
Ultra-low velocity zones (ULVZs) are localized small-scale patches with extreme physical
properties at the core-mantle boundary that often gather at the margins of Large Low …
properties at the core-mantle boundary that often gather at the margins of Large Low …
[HTML][HTML] Global receiver function observations of the X-discontinuity reveal recycled basalt beneath hotspots
The distribution of chemical heterogeneity beneath hotspots provides important constraints
on the source of magmatism and mantle convection. Chemical heterogeneities in the upper …
on the source of magmatism and mantle convection. Chemical heterogeneities in the upper …
Multigenetic origin of the X‐discontinuity below continents: Insights from African receiver functions
Constraints on chemical heterogeneities in the upper mantle may be derived from studying
the seismically observable impedance contrasts that they produce. Away from subduction …
the seismically observable impedance contrasts that they produce. Away from subduction …
Ultra‐low velocity zone beneath the Atlantic near St. Helena
There are various hotspots in the Atlantic Ocean, which are underlain by mantle plumes that
likely cross the mantle and originate at the core‐mantle boundary. We use teleseismic core …
likely cross the mantle and originate at the core‐mantle boundary. We use teleseismic core …
High-resolution mid-mantle imaging with multiple-taper SS-precursor estimates
SUMMARY SS-precursor imaging is used to image sharp interfaces within Earth's mantle.
Current SS-precursor techniques require tightly bandpassed signals (eg 0.02–0.05 Hz) …
Current SS-precursor techniques require tightly bandpassed signals (eg 0.02–0.05 Hz) …
X‐discontinuity beneath the Indian Shield—Evidence for remnant Tethyan oceanic lithosphere in the mantle
Beneath the continents and island arcs, a seismic discontinuity is often detected around 300
km depth, referred to as the X‐discontinuity. Various mineralogical and petrological …
km depth, referred to as the X‐discontinuity. Various mineralogical and petrological …
Insights into deep mantle thermochemical contributions to African magmatism from converted seismic phases
The contribution of mantle upwellings of varying spatial extent to Cenozoic magmatism
across Africa is debated because geochemical and seismological tools used to interrogate …
across Africa is debated because geochemical and seismological tools used to interrogate …
Textures Induced by the Coesite‐Stishovite Transition and Implications for the Visibility of the X‐Discontinuity
M Krug, M Saki, E Ledoux, JP Gay… - Geochemistry …, 2022 - Wiley Online Library
The coesite‐stishovite phase transition is considered the most plausible candidate to
explain the X‐discontinuity observed at around 300 km depth in a variety of tectonic settings …
explain the X‐discontinuity observed at around 300 km depth in a variety of tectonic settings …
Sound velocities of stishovite at simultaneous high pressure and high temperature suggest an eclogite‐rich layer beneath the Hawaii hotspot
Compressional and shear wave velocities of polycrystalline stishovite (SiO2) have been
measured at simultaneous high pressures and temperatures up to 14.5 GPa and 800° C. By …
measured at simultaneous high pressures and temperatures up to 14.5 GPa and 800° C. By …