Results 171 to 180 of about 9,905 (218)
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Earth and Planetary Science Letters, 2015
Abstract We have identified carbonatitic melts as the main agent for metasomatism in cpx-free garnet harzburgites from the Kaapvaal craton. Substantial overlap of the Ti/Eu and Zr/Hf ratios of subcalcic garnets from xenoliths and garnet inclusions in diamonds corroborate previous findings that mantle metasomatism and the growth of diamonds are ...
Qiao Shu, Gerhard P. Brey
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Abstract We have identified carbonatitic melts as the main agent for metasomatism in cpx-free garnet harzburgites from the Kaapvaal craton. Substantial overlap of the Ti/Eu and Zr/Hf ratios of subcalcic garnets from xenoliths and garnet inclusions in diamonds corroborate previous findings that mantle metasomatism and the growth of diamonds are ...
Qiao Shu, Gerhard P. Brey
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Geochimica et Cosmochimica Acta, 1988
Most Cr-diopside spinel lherzolite xenoliths from Bullenmerri and Gnotuk Maars, western Victoria, show modal metasomatism involving the growth of amphibole ± mica ± apatite at the expense of primary pyroxenes + spinel. The metasomatism is attributed to CO2-rich fluids, observed in fluid inclusions.
Suzanne Y. O'Reilly, W.L. Griffin
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Most Cr-diopside spinel lherzolite xenoliths from Bullenmerri and Gnotuk Maars, western Victoria, show modal metasomatism involving the growth of amphibole ± mica ± apatite at the expense of primary pyroxenes + spinel. The metasomatism is attributed to CO2-rich fluids, observed in fluid inclusions.
Suzanne Y. O'Reilly, W.L. Griffin
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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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Metasomatic mineral titanate complexing in the upper mantle
Nature, 1986The extent and expression of metasomatism in the upper mantle are contentious issues1,2, although the process has gained widespread acceptance to account for the subsequent enrichment of previously depleted lithosphere3,4. Uncertainties exist in the origin and precise compositions of the fluids involved, as well as in the total inventory of introduced ...
Stephen E. Haggerty +2 more
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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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An experimental replication of upper-mantle metasomatism
Nature, 1995INTERACTION of melts ascending from the asthenosphere with the lithospheric mantle through which they pass is widely accepted to be a significant process by which the lithosphere can acquire distinctive trace-element and isotopic signatures1–3. Despite the importance of this process in the genesis of the lithosphere, the nature of these 'metasomatic ...
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Annual Review of Earth and Planetary Sciences, 1985
Michael F. Roden, V. Rama Murthy
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Michael F. Roden, V. Rama Murthy
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Contrasting Types of Upper-Mantle Metasomatism?
1984Abstract Metasomatism is now well-recognized in upper-mantle peridotite xenoliths in kimberlites and basalts. It is patent when petrographically recognizable by development of hydrous phases rich in incompatible elements, usually by replacement of anhydrous phases and sometimes associated with injection of fluids into channel ways.
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Lithospheric Mantle Metasomatism by Reactive Hydrous Infiltration
Earth’s volatile budget calculations indicate the need for an additional upward flux of water released through subduction processes, beyond what is accounted for by arc magmatism. This excess water may diffuse or be channeled through various mechanisms.Marko Repac +3 more
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Stable Zirconium Isotopic Compositions of the Metasomatized Mantle
Journal of Geophysical Research: Solid EarthAbstractMantle metasomatism, which affects the geochemical and lithological properties of the Earth, is crucial to the evolution and modification of the Earth's interior. Variations in chemical proxy of metasomatism, including high‐field strength elements (HFSE, e.g., Zr‐Ti isotopes and isovalent Zr‐Hf), have been commonly utilized as a tool to unravel
Zongqi Zou +9 more
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