Results 31 to 40 of about 29,724 (300)
Granite subduction: Arc subduction, tectonic erosion and sediment subduction
Gondwana Research, 2009 Abstract Continental growth has been episodic, reflecting the episodic nature of mantle dynamics as well as surface dynamics of the Earth, the net result of which is exhibited by the present mantle with two huge reservoirs of TTG rocks, one on the surface continents and the other on the D″ layer on the Core-Mantle Boundary (CMB).
H. Senshu +5 more
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Nature, 2019 A hidden carbon cycle exists inside Earth. Every year, megatons of carbon disappear into subduction zones, affecting atmospheric carbon dioxide and oxygen over Earth’s history. Here we discuss the processes that move carbon towards subduction zones and transform it into fluids, magmas, volcanic gases and diamonds.
Plank, Terry A., Manning, Craig
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Fluid pressurisation and earthquake propagation in the Hikurangi subduction zone [PDF]
, 2021 In subduction zones, seismic slip at shallow crustal depths can lead to the generation of tsunamis. Large slip displacements during tsunamogenic earthquakes are attributed to the low coseismic shear strength of the fluid-saturated and non-lithified clay-rich fault rocks.
arxiv +1 more source
Wet subduction versus cold subduction
Geophysical Research Letters, 2005 In situ X‐ray diffraction study of post‐spinel transformation in hydrous peridotite (2 wt.% H2O) indicates that the phase boundary is shifted to higher pressures by 0.6 GPa relative to anhydrous peridotite at 1473 K, whereas, it shows no obvious shift at high temperature around 1873 K. A linear equation for the boundary is P (GPa) = −0.002 T (K) + 26.3,
Akio Suzuki +4 more
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Dynamical effects of subducting ridges: Insights from 3-D laboratory models [PDF]
Geophysical Journal International 163 (2005) 1137-1150, 2010 We model the subduction of buoyant ridges and plateaus to study their effect on slab dynamics. Oceanic ridges parallel to the trench have a stronger effect on the process of subduction because they simultaneously affect a longer trench segment. Large buoyant slab segments sink more slowly into the asthenosphere, and their subduction result in a ...
arxiv +1 more source
Rough Subducting Seafloor Reduces Interseismic Coupling and Mega-Earthquake Occurrence: Insights From Analogue Models [PDF]
Geophysical Research Letters, American Geophysical Union, 2019, 46
(6), pp.3124-3132, 2019 The roughness of the subduction interface is thought to influence seismogenic behavior in subduction zones, but a detailed understanding of how such roughness affects the state of stress along the subduction megathrust is still debated. Here, we use seismotectonic analogue models to investigate the effect of subduction interface roughness on seismicity
arxiv +1 more source
On the Thermodynamics of Subduction
Journal of Physical Oceanography, 1995 Abstract The thermodynamic processes attendant on the transfer of fluid between a surface mixed layer and a stratified thermocline beneath are discussed. For a parcel of fluid in the mixed layer to pass into the stratified thermocline—to subduct—it must be stratified by buoyancy input; this buoyancy can be supplied by local air–sea exchange and/or by ...
Marshall, D, Marshall, J
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Kinematics of subduction and subduction‐induced flow in the upper mantle [PDF]
Journal of Geophysical Research: Solid Earth, 2004 Results of fluid dynamical experiments are presented to model the kinematics of lithospheric subduction in the upper mantle. The experiments model a dense high‐viscosity plate (subducting lithosphere) overlying a less dense low‐viscosity layer (upper mantle). The overriding lithosphere is not incorporated.
Wouter P. Schellart, Wouter P. Schellart
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Quantifying continental collision dynamics for Alpine-style orogens
Frontiers in Earth Science, 2022 When continents collide, the arrival of positively buoyant continental crust slows down subduction. This collision often leads to the detachment of earlier subducted oceanic lithosphere, which changes the subsequent dynamics of the orogenic system ...
Luuk van Agtmaal +4 more
doaj +1 more source
A silicon memory of subduction [PDF]
Nature Geoscience, 2019 Subduction processes may have operated very early in Earth’s history according to the heavy silicon isotope compositions of Archaean igneous rocks. The silicon that precipitated out of the Archaean oceans as chert was subducted and melted to yield seawater-like heavy isotope signatures in early granitic rocks.
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