Results 161 to 170 of about 10,059 (219)

Extreme maldistribution of high field strength elements along subduction zones revealed by baddeleyite aggregates in serpentinite. [PDF]

Sci Rep
Sawada H, Oyanagi R, Niki S, Hirata T, Yoshida K, Nagata M, Okamoto A.   +6 more
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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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The role of celadonite on mantle metasomatism in subduction settings

Applied Clay Science, 2021
Abstract Celadonite is the most abundant K-rich hydrated mineral formed during basalt alteration. In convergent margins, celadonite from the altered oceanic crust sinks into the mantle and contributes to the mantle wedge metasomatism, recorded by incompatible element enrichment in lavas and mantle xenoliths samples from these settings.
R.V.S. Quinteiro, R.V. Conceição, L.C. Carniel, F.P. Leitzke, J.B.M. Cunha, M.R. Souza, M.E.B. Gomes   +6 more
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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—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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LIGHT ELEMENT METASOMATISM OF THE CONTINENTAL MANTLE: THE EVIDENCE AND THE CONSEQUENCES

Physics and Chemistry of the Earth, 1975
Abstract The highly potassic volcanics of South West Uganda and the sodi-potassic volcanics of the West Eifel, Germany, represent two distinctive aspects of the highly alkaline volcanism characteristic of uplifted and rifted continental cratons. The sparse lavas are feldspathoidal clinopyroxenites and the associated explosive volcanism provides ...
F.E. Lloyd, D.K. Bailey
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Earth degassing, mantle metasomatism, and isotopic evolution of the mantle

Geology, 1983
Excess 3 He in mantle-derived rocks relative to atmospheric abundance shows that degassing of Earth is a continuing process. The importance of chemical changes induced by fluids from the deep mantle on the oceanic and continental lithosphere has been recognized increasingly in recent years.
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A model of mantle metasomatism

1987
Structural, lithologic, and geochemical relationships are integrated to provide a basis for modeling upper mantle metasomatism, the evidence of which is observed in mafic and ultramafic rocks of peridotite massifs and xenoliths from basalts and kimberlites.
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The influence of mantle metasomatism on the oxidation state of the lithospheric mantle

2009
The oxidation state, reflected in the oxygen fugacity (fO2), of the lithospheric mantle is both laterally and vertically heterogeneous. Depth-fO2 profiles from kimberlite-borne peridotitic mantle xenoliths from the Bultfontein kimberlite, Kimberley, South Africa and the A154-N and A154-S kimberlites of the Diavik Mine, NWT, Canada were constructed by ...
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