Results 81 to 90 of about 338,697 (184)

Modelling the controls on melt generation during continental extension and breakup

, 2008
Rifting is the process that leads to the formation of oceans. Rifting is the break up ofcontinents, leading to the formation of new oceanic floor between the two continentalplates.
Armitage, John J.
core   +1 more source

A REE Inverse Model From Bulk Distribution Coefficients and Boundary Conditions: Results for Shield and Rejuvenated Stage Hawaiian Volcanoes

Geochemistry, Geophysics, Geosystems
A major challenge in mantle geochemistry is determining the source composition and melt fraction involved in melting. We provide a new Rare‐Earth Element (REE) inverse model that provides source concentration, source and melt mineral modes, and melt ...
M. J. Carr, M. D. Feigenson, E. Gazel
doaj   +1 more source

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, Petford, Nick, Rushmer, Tracy, Yuen, D., Stackhouse, Stephen   +4 more
core   +2 more sources

Geodynamic Controls on Mantle Differentiation and Preservation of Long‐Term Geochemical Heterogeneity: Focus on the Primitive Undegassed Mantle

Geochemistry, Geophysics, Geosystems
The compositional evolution of the Earth's mantle is the result of mantle differentiation and thermal evolution. Partial melting of mantle materials produces geochemical heterogeneities, allows for degassing and depends on the thermal state of the mantle,
Nicolas Récalde, J. Huw Davies, James Panton, Don Porcelli, Morten Andersen   +4 more
doaj   +1 more source

Cr-spinel records metasomatism not petrogenesis of mantle rocks

Nature Communications, 2019
Chromian-spinel from mafic-ultramafic rocks is used as a reliable geotectonic and mantle melting indicator. Here, the authors argue that this only works partially – it can be used to assess information on mantle metasomatic processes but not petrogenesis.
Hamed Gamal El Dien, Shoji Arai, Luc-Serge Doucet, Zheng-Xiang Li, Youngwoo Kil, Denis Fougerouse, Steven M. Reddy, David W. Saxey, Mohamed Hamdy   +8 more
doaj   +1 more source

Hydrous multi-stage mantle melting controls gold enrichment in mafic Kermadec arc magmas

Communications Earth & Environment
Many exceptionally Au-rich deposits are associated with subduction zones and Au-rich magmas. However, the origin of Au enrichment in arc magmas remains controversial.
Christian Timm, Maxim Portnyagin, Cornel E. J. de Ronde, Mark D. Hannington, Dieter Garbe-Schönberg, Kaj Hoernle, Philipp A. Brandl, Dan Layton-Matthews, Matthew Leybourne, Nadezhda M. Sushchevskaya, Rex N. Taylor, Richard J. Arculus   +11 more
doaj   +1 more source

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges [PDF]

Oceanography, 2012
It is widely accepted that plate divergence at mid-ocean ridges drives mantle flow, mantle melting, and the formation of new oceanic crust. However, many of the details of this process remain obscure because of the inaccessibility of the mantle to direct
Patricia M. Gregg, Laura B. Hebert, Laurent G.J. Montési, Richard F. Katz   +3 more
doaj  

Insights on Upper Mantle Melting, Rheology, and Anelastic Behavior From Seismic Shear Wave Tomography. [PDF]

Geochem Geophys Geosyst, 2018
Cobden L, Trampert J, Fichtner A.
europepmc   +1 more source

Mantle melting and lithospheric structure beneath eastern Australia's Cenozoic volcanoes from 3D magnetotellurics. [PDF]

Sci Rep
Margiono R, Heinson G.
europepmc   +1 more source

Onset of slab mantle melting in Earth's lower mantle: Evidence from ferropericlase in superdeep diamonds. [PDF]

Sci Adv
Ni P, Shirey SB, Walter MJ, Czas J, Novella D, Nestola F, Kueter N, Smith EM, Stachel T, Pearson DG, Steele A, Gardner LL, Jacobsen SD, Harte B, Harris JW, Shahar A.   +15 more
europepmc   +1 more source