Results 161 to 170 of about 9,905 (218)

Incipient carbonate melting drives metal and sulfur mobilization in the mantle. [PDF]

Sci Adv
Ezad IS, Saunders M, Shcheka SS, Fiorentini ML, Gorojovsky LR, Förster MW, Foley SF.   +6 more
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Integrated acoustic identification of a petit-spot volcanic field in the oldest Pacific plate. [PDF]

Sci Rep
Machida S, Kaneko J, Inose K, Nozaki T, Iijima K, Hirano N.   +5 more
europepmc   +1 more source

New geochemical and Sr-Nd-Hf isotopic constraints on the genesis of kimberlites and ultramafic lamprophyres from the Adelaide Fold Belt and Gawler Craton, South Australia. [PDF]

Mineral Petrol
Dalton H, Giuliani A, Fitzpayne A, Peters BJ.   +3 more
europepmc   +1 more source

Water in Earth's mantle : Metasomatism and melting

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Mantle metasomatism by ephemeral carbonatite melts

Nature, 1988
Recent experiments1 have shown that, at a range of upper-mantle temperatures and pressures, a carbonatite (carbonate-rich) melt occurs as a very small melt fraction in equilibrium with pargasite lherzolite. This melt has low water content and low TiO2 content, and will be extremely effective in transporting large-ion lithophile elements.
David H. Green, Margaret E. Wallace
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Metasomatic oxidation of upper mantle periodotite

Contributions to Mineralogy and Petrology, 1991
Examination of Fe3+ in metasomatized spinel peridotite xenoliths reveals new information about metasomatic redox processes. Composite xenoliths from Dish Hill, California possess remnants of magmatic dikes which were the sources of the silicate fluids responsible for metasomatism of the peridotite part of the same xenoliths.
McGuire, A. V., Dyar, M. D., Nielson, J. E.   +2 more
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Mantle metasomatism—precursor to continental alkaline volcanism

Geochimica et Cosmochimica Acta, 1980
REE distributions of an unusual suite of mantle-derived amphibole/apatite rich xenoliths have very steep, LREE-enriched chondrite-normalised patterns with no Eu anomalies. These are closely analogous to REE distributions of carbonatitic and kimberlitic rocks.
Suzanne Y. Wass, N.W. Roge
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Superplume metasomatism: Evidence from Siberian mantle xenoliths

Lithos, 2014
Abstract The Siberian craton contains > 1000 kimberlite intrusions of various ages (Silurian to Jurassic), making it an ideal locality for a craton-wide study on the evolution of the sub-continental lithospheric mantle (SCLM). The primary objective of this study is to characterize the temporal and spatial metasomatic effects on the Siberian SCLM ...
Howarth, Geoffrey H., Barry, Peter H., Pernet-Fisher, John F., Baziotis, Ioannis P., Pokhilenko, Nikolay P., Pokhilenko, Lyudmila N., Bodnar, Robert J., Taylor, Lawrence A., Agashev, Aleksey M.   +8 more
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Mantle metasomatism—perspective and prospect

Geological Society, London, Special Publications, 1987
Summary Mantle replenishment in lithophile elements has been discerned in the patterns of trace elements and isotopes in lavas. One replenishment process is identified as metasomatic replacement, seen in ultramafic xenoliths brought up in high-velocity alkaline eruptions.
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Mantle metasomatism: The REE story

Geology, 1984
Refractory rocks with light REE/heavy REE ratios greater than chondrite are common as xenoliths in basalts and kimberlites and are found in some oceanic peridotite massifs. This has led to the supposition that large parts of the upper mantle have been metasomatically altered by addition of light REE and other hyperfusible constituents.
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