Results 61 to 70 of about 4,719 (167)

Ultrafast mantle impregnation by carbonatite melts

Geology, 2000
Carbonatitic melts are often invoked as responsible for metasomatism in the mantle because of their unique chemical and physical properties. Here we report on infiltration experiments demonstrating that such melts can percolate very quickly in polycrystalline olivine.
Hammouda, Tahar, Laporte, Didier
openaire   +4 more sources

A Rare Glimpse of Paleoproterozoic Sub‐Arc Mantle: The Ussuit Peridotite, West Greenland

Geochemistry, Geophysics, Geosystems
Mantle residues beneath Archean cratonic nuclei have been extensively studied, whereas less attention has been given to the mantle lithosphere beneath Proterozoic mobile belts that link these nuclei.
T. McIntyre, P. Waterton, L. Li, B. Gong, X. Zha, K. Szilas, D. G. Pearson   +6 more
doaj   +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

Lithosphere Modification Beneath the North China Craton: Geochemical Constraints of Water Contents from the Damaping Peridotite Xenoliths

Crystals
The water contents and geochemical evidence of nominally anhydrous minerals in peridotite xenoliths provide critical insights into lithospheric mantle features, offering a deep understanding of cratonic destruction and mantle evolution processes ...
Baoyi Yang, Bo Xu, Yi Zhao, Hui Zhang
doaj   +1 more source

Low-degree mantle melting controls the deep seismicity and explosive volcanism of the Gakkel Ridge. [PDF]

Nat Commun, 2022
Koulakov I, Schlindwein V, Liu M, Gerya T, Jakovlev A, Ivanov A.   +5 more
europepmc   +1 more source

The development of the Ingul megablock of the Ukrainian Shield during the formation of the Novoukrainsky and Korsun-Novomirgorod Plutons

Геофизический журнал, 2013
Analysis of geological structure and the studies of composition of magmatic complexes of the Ingul block of the Ukrainian Shield makes possible to come to some conclusions on its deep structure during the period of 2,1-1,7 Ga.
O.V. Usenko
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

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

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  

Multiscale chemical heterogeneities beneath the eastern Southwest Indian Ridge (52°E–68°E): Trace element compositions of along‐axis dredged peridotites

Geochemistry, Geophysics, Geosystems, 2011
The Southwest Indian Ridge is characterized by frequent outcrops of mantle rocks in a very slow spreading context. In situ measurements of trace element concentrations in pyroxenes of these rocks, and associated petrogenetic modeling, are reported ...
Monique Seyler, Daniele Brunelli, Michael J. Toplis, Catherine Mével   +3 more
doaj   +1 more source