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Glasses in Mantle Xenoliths from Olmani, Tanzania
The Journal of Geology, 1983Nineteen mantle xenoliths from Olmani, Tanzania, have deformation textures and fluid inclusions like those in olivine-rich peridotites from Hawaii. Group A comprises 7 barren harzburgites (spinel, TiO2
Adrian P. Jones +2 more
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Glasses in mantle xenoliths: A tool for understanding mantle processes
1999A new perspective in the evolution of mantle material was developed along with the concept of metasomatism, that is peridotitic mantle could not only be depleted through melting process, but it could also get enriched by migration and reaction with fluids coming from deeper mantle portions. Anydrous mantle parageneses alone are not able to generate the
COLTORTI, Massimo +4 more
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Mineralogy of the upper mantle: A review of the minerals in mantle xenoliths from kimberlite
Earth-Science Reviews, 1977Abstract The importance of ultramafic and eclogitic xenoliths in kimberlite as representing the rocks and minerals of the upper mantle has been widely perceived during the last decade. Studies of the petrology and mineral chemistry of these mantle fragments as well as of inclusions in diamond, have led to significant progress in our understanding of ...
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Xenolith-derived mantle geotherms: whither the inflection?
Contributions to Mineralogy and Petrology, 1989Three possibilities exist for the geometry of the upper mantle geotherm determined from study of garnet lherzolite xenoliths from Cretaceous kimberlites of northern Lesotho, southern Africa: (1) the geotherm is inflected to a lower thermal gradient at greater depth (“low-T inflection”); (2) the geotherm is uninflected; and (3) the geotherm is inflected
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Evolution of the sub-cratonic mantle seen in mantle xenoliths
2016Detailed investigations of the petrology and geochemistry of the Jagersfontein mantle pendotite xenolith suite have yielded new refinements to models of subcratonic mantle petrogenesis. The Jagersfontein peridotitic xenoliths show three distinct xenolith types as recognised by Winterburn (1987): a coarse low-temperature, a coarse medium-temperature ...
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Phosphorus-rich pyroxene in mantle xenoliths
2017Numerous recent reports of detailed crystal zoning patterns and anomalous enrichment in phosphorus (P) have focused mainly on olivine from various settings [1-4]. P enrichment and zoning in olivine have been attributed to rapid crystal growth and development of disequilibrium as well as to growth from P-rich melts.
IOANNIS P. BAZIOTIS +6 more
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