Results 11 to 20 of about 25,796 (267)

Imaging Lithospheric Discontinuities Beneath the Northern East African Rift Using S‐to‐P Receiver Functions

open access: yesGeochemistry, Geophysics, Geosystems, 2018
Imaging the lithosphere is key to understand mechanisms of extension as rifting progresses. Continental rifting results in a combination of mechanical stretching and thinning of the lithosphere, decompression upwelling, heating, sometimes partial melting
Aude Lavayssière   +7 more
doaj   +1 more source

Magmatic Activity and Dynamics of Melt Supply of Volcanic Centers of Ultraslow Spreading Ridges: Hints From Local Earthquake Tomography at the Knipovich Ridge

open access: yesGeochemistry, Geophysics, Geosystems, 2022
Along ultraslow spreading ridges melt is distributed unequally, but melt focusing guides melt away from amagmatic segments toward volcanic centers. An interplay of tectonism and magmatism is thought to control melt ascent, but the detailed process of ...
M. Meier, V. Schlindwein, F. Schmid
doaj   +1 more source

Effect of Terrigenous Sediment Addition on the Generation of Arc Silicic Magma: Constraints From the Comparative Partial Melting Experiment at 1.5 GPa

open access: yesFrontiers in Earth Science, 2022
To assess the effects of sediment addition on the partial melting of subducted oceanic crust and generation of arc silicic magma, a series of comparative partial melting experiments on a garnet plagioamphibolite and a 90 wt% garnet plagioamphibolite + 10 
Chunjuan Zang   +5 more
doaj   +1 more source

Magnetotelluric Constraints on the Temperature, Composition, Partial Melt Content, and Viscosity of the Upper Mantle Beneath Svalbard

open access: yesGeochemistry, Geophysics, Geosystems, 2020
Long‐period magnetotelluric (MT) data can be used to interpret upper mantle temperature, hydrogen content, and the presence of partial melt, all of which strongly influence mantle viscosity. We have collected the first long‐period MT data in Svalbard and
Kate Selway   +7 more
doaj   +1 more source

Insights on Upper Mantle Melting, Rheology, and Anelastic Behavior From Seismic Shear Wave Tomography

open access: yesGeochemistry, Geophysics, Geosystems, 2018
In seismic tomography we map the wave speed structure inside the Earth, but we ultimately seek to interpret those images in terms of physical parameters.
Laura Cobden   +2 more
doaj   +1 more source

Acoustic and Microstructural Properties of Partially Molten Samples in the Ice–Ammonia System

open access: yesGeosciences, 2019
We measured the ultrasonic properties and microstructure of two-phase binary mixtures of the ice−ammonia partial melt system, which was selected based on its importance for numerous planetary bodies.
Christine McCarthy   +4 more
doaj   +1 more source

Ethylene Homopolymerization by Ziegler-Natta (TiCl4/MgCl2) Catalyst through Full Factorial Experimental Design [PDF]

open access: yesعلوم و تکنولوژی پلیمر, 2009
Full factorial experimental design (23) for the evaluation of slurry ethylene polymerization in the presence of an industrial TiCl4/MgCl2 Ziegler-Natta catalyst was employed.
S. Hakim   +3 more
doaj   +1 more source

Anatexis and enrichment mechanism of the Fe-Ti oxide minerals in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica

open access: yesDizhi lixue xuebao, 2021
Fe-Ti oxide minerals can be locally aggregated or enriched in the quartzofeldspathic gneisses from the Larsemann Hills, East Antarctica. The enrichment is related to anatexis and subsequent high-grade metamorphism, not inherited from the protolith.
REN Liudong
doaj   +1 more source

Partial melting in the deepest mantle [PDF]

open access: yesGeophysical Research Letters, 2002
We have compared the travel times of direct (P, S) and core‐reflected (PcP, ScS) phases recorded in southern Africa from earthquakes occurring in the Scotia Arc region. The low‐velocity region beneath the south Atlantic is explored by calculating ScS‐S and PcP‐P travel‐time residuals to determine the correlation and magnitude of Vs and Vp reductions in
N. A. Simmons, S. P. Grand
openaire   +1 more source

Microstructures of Fe-16wt%S-2wt%Si in Partial and Complete Melt Regions at High Pressures: Implications for Dynamics in Small Planetary Cores

open access: yesCrystals
Regions of partial melt of Fe-S-Si alloys at high pressures may arise during planetary formation or at the boundary of the inner and outer cores of small terrestrial planetary bodies.
Erin Lenhart   +2 more
doaj   +1 more source

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