Mantle Xenoliths
The origin of mantle xenoliths in Tertiary alkaline basalts, British Columbia, Canada: Implications for convergent plate margin geodynamic and petrogenetic processes
... refractory mantle xenoliths typically contain higher Mg-numbers stemming from high degrees of partial melting (see Ishiwatari, 1985; Ishii et al, ...
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Interaction between protokimberlite melts and mantle lithosphere: evidence from mantle xenoliths from the Dalnyaya kimberlite pipe, Yakutia (Russia)
... Ashchepkov, I.V. and Ntaflos, T. and Spetsius, Z.V. and Salikhov, R.F. and Downes, Hilary (2017) Interaction between protokimberlite melts and mantle lithosphere: evidence from mantle xenoliths from ...
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Hf–Zr anomalies in clinopyroxene from mantle xenoliths from France and Poland: implications for Lu–Hf dating of spinel peridotite lithospheric mantle
... Downes, Hilary and de Vries, C. and Wittig, N. (2015) Hf–Zr anomalies in clinopyroxene from mantle xenoliths from France and Poland: implications for Lu–Hf dating of spinel peridotite lithospheric ...
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Hydrogen isotope geochemistry of the mantle: constraints from back arc basin basalts and mantle xenoliths
... sub-arc xenoliths are consistent with loss of 80% of the initial hydrogen concentration (Demouchy, Jacobsen et ...from mantle xenoliths (Peslier and Luhr 2006), and using diffusion coefficients for ...
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The Sytykanskaya kimberlite pipe: Evidence from deep seated xenoliths and xenocrysts for the evolution of the mantle beneath Alakit, Yakutia, Russia
... by breccia. There are three phases of the kimberlite intrusion. All kimberlites types in Sytykan pipes are more abundant in ilmenites and pyropes than other pipes from the DaldyneAlakite region. The main ABK body contain ...
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Mantle melting versus mantle metasomatism “the chicken or the egg” dilemma
... recovered mantle xenoliths are interpreted to have been metasomatised by an external agent, there are few reports in the literature on the source of the agent itself, ...a mantle rock, which was a ...
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Mafic alkaline metasomatism in the lithosphere underneath East Serbia: evidence from the study of xenoliths and the host alkali basalts
... Striževac, mantle xenoliths are present (Cvetković et ...However, mantle xenolith-bearing basanites from Sokobanja are characterized by uniformly low 87 Sr/ 86 Sr ratios ...
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Spinel Bearing Lherzolite Xenoliths from Hosséré Garba (Likok, Adamawa Cameroon): Mineral Compositions and Geothermobarometric Implications
... Garba mantle xenoliths as those from Ngao Voglar [4] are spinel peridotites, containing neither plagioclase nor garnet, and were derived from the spinel stability field in the mantle, which lies in a ...
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Mantle conditions and kimberlite geochemical criteria controlling diamond survival in Kimberlites
... equilibrated mantle (Nowicki et ...their mantle-equilibrated assemblages during and subsequent to transportation by kimberlite magma, mantle xenoliths have provided direct history information ...
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Morphology and surface features of olivine in kimberlite: implications for ascent processes
... In this study three sample sets were analysed. Fifteen indi- vidual olivine crystals from the Igwisi Hills (IH) lava are compared with olivine phenocrysts from an Icelandic lava and olivine grains disaggregated from ...
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Carbonatite metasomatism in the southeastern Australian lithosphere
... peridotite xenoliths from Spitsbergen: Tanzanian peridotite xenoliths: a comparison with Kaapvaal peri- implications for trace element signature of mantle carbonate meta- dotites and inferences on ...
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Deep seated xenoliths and xenocrysts from Sytykanskaya pipe: evidence for the evolution of the mantle beneath Alakit, Yakutia, Russia
... PT conditions for garnet xenocrysts from PK (Fig. 10A) create nearly linear trends close to 600 o C at the Moho and decreasing to the 35 mW/m 2 geotherm at 6.5 GPa where there is an inflection corresponding to the ...
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High-temperature granulites and supercontinents
... The formation of continents involves a combination of magmatic and metamorphic processes. These processes become indistinguishable at the crust-mantle interface, where the pressure-temperature (P-T) conditions of ...
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Empirical evidence for the fractionation of carbon isotopes between diamond and iron carbide from the Earth’s mantle
... in mantle diamond from the Jagersfontein kimberlite [Sharp, 1966], nor as inclusions in mantle diamond [Bulanova and Zayakina, 1991; Kaminsky and Wirth, 2011] and garnet [Jacob et ...with mantle ...
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Potential trade offs between biomineralization and immunity revealed by shell properties and gene expression profiles of two closely related Crassostrea species
... only certain fractions of hemocytes are responsible for mineral sequestration and transport. Higher investment in biomineralization function is also apparent from the elevated expression of biomineralization-related ...
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The system potassium carbonate-magnesium carbonate as an analogue to mantle carbonate melts: Experimental determination of phase relations and selected physical properties at high pressure
... The composition of the Earth is not constant. Variations occur in bulk Earth composition with time, due to accretion of stellar and sub-planetary material and loss of light elements from the atmosphere. In addition, ...
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The Mantle Plume Debates
... Large igneous provinces (LIPs), which represent anomalously high magmatic fluxes, create from processes other than “normal” seafloor spreading and they are formed by intrusive rock and extrusive rock, both of which are ...
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Dynamical geochemistry of the mantle
... From the previous discussion we can distinguish two kinds of recycling of mantle material (Fig. 18a). The formation of oceanic crust, from melt under a mid-ocean ridge, extracts mafic material from the ...
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The Model of Oceanic Crust Expansion
... earth’s mantle. The element leading to the volume decrease of the earth’s mantle is the discharge of the earth’s mantle matters, that is, the new oceanic crust formed by the earth’s mantle ...
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Shell organic matrices in some pearl oysters and other bivalves
... It is ubiquitous in those species investigated which have no junction of Valve with External Mantle or Mantle Margin distal to the Adductor Muscle and which have a calcitic Simple Prisma[r] ...
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