Results 121 to 130 of about 603 (179)
Petrographic and geochemical evidence from pyrite for the genesis of the Bainiuchang Ag-polymetallic deposit southeastern Yunnan. [PDF]
Sci RepWang T +11 more
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Fluid-rock interaction processes in ancient subduction zones evidenced by the high-pressure-low-temperature Acatlán complex, Mexico. [PDF]
Sci RepGutiérrez-Aguilar F +3 more
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Oxidation of the Kaapvaal lithospheric mantle driven by metasomatism
Contributions To Mineralogy and Petrology, 2008The oxidation state, reflected in the oxygen fugacity (fO2), of the subcratonic lithospheric mantle is laterally and vertically heterogeneous. In the garnet stability field, the Kaapvaal lithospheric mantle becomes progressively more reducing with increasing depth from Δlog fO2 FMQ-2 at 110 km to FMQ-4 at 210 km. Oxidation accompanying metasomatism has
Catherine McCammon +2 more
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The role of celadonite on mantle metasomatism in subduction settings
Applied Clay Science, 2021Abstract 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 +6 more
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Mantle metasomatism by ephemeral carbonatite melts
Nature, 1988Recent 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, 1991Examination 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. +2 more
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Mantle metasomatism—perspective and prospect
Geological Society, London, Special Publications, 1987Summary 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, 1984Refractory 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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Earth degassing, mantle metasomatism, and isotopic evolution of the mantle
Geology, 1983Excess 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
1987Structural, 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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