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Now showing items 16166-16185 of 39124
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(1996)Chemical evaluation of fluids affected during progressive water-sediment interactions provides critical information regarding the role of slab dehydration and/or crustal recycling in subduction zones. To place some constraints ...
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(1999)Peridotite xenoliths from the Bereya alkali picrite tuff in the Vitim volcanic province of Transbaikalia consist of garnet lherzolite, garnet-spinel lherzolite and spinel lherzolite varieties. The volcanism is related to ...
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(2005)Trace element compositions of submicroscopic inclusions in both the core and the coat of five coated diamonds from the Democratic Republic of Congo (DRC, formerly Zaire) have been analyzed by Laser Ablation Inductively ...
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(2006)Submarine groundwater discharge (SGD) is an important source of dissolved elements to the ocean, yet little is known regarding the chemical reactions that control their flux from sandy coastal aquifers. The net flux of ...
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(2001)We have investigated the diffusivity of trace elements in hydrous iron-free andesitic melts containing 4.5 to 5.2 wt.% water at a pressure of 500 MPa and at temperatures between 1100 and 1400°C using the diffusion couple ...
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(1998)Diffusivities of geochemically important trace elements (eleven rare earth elements (REE), Rb, Sr, Ba, and Y) in jadeite and diopside melts and those of Zr, Nb, Th, and U in jadeite melt have been measured at pressures ...
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(1997)We used the Panurge ion microprobe to measure concentrations of the rare earth elements (REEs), Ba, Hf, and Sr in melilite, clinopyroxene, plagioclase, and perovskite and Mg isotopes in plagioclase, spinel, melilite, ...
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(2004)The present paper considers trace element distribution in two natural systems: kimberlite-bitumen and basalt-bitumen. In the given case, carbonaceous matter in magmatic rocks is interpreted as a result of abiogenic synthesis ...
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(1999)The thin walls of young black smoker chimneys experience steep physico-chemical gradients during active venting of hydrothermal fluid, and these gradients control trace element precipitation within those walls. Here, we ...
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(2000)The trace element compositions of eclogites, blueschists and mafic granulites from high-pressure terranes have been analysed to investigate element losses and fractionation that occur during dehydration of oceanic basalt ...
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(2004)Spatially closely associated gabbros and eclogites of central Zambia represent relics of subducted oceanic crust in a suture zone. The eclogites, which formed at 630–690 °C and 2.6–2.8 GPa, yield Lu–Hf ages between 607±14 ...
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(1998)Dynamic partial melting model has recently drawn considerable attention because this model may explain the fractionation of some strongly incompatible nuclides in the uranium decay series (McKenzie, 1985; Beattie, 1993) ...
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(2004)Trace element distribution in melilite-bearing and melilite-free rocks and their minerals is studied for Odikhincha, a typical alkali ultramafic ring-type massif in the northwestern Siberian Platform. The melilite-bearing ...
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(1995)The mixing (integration) of liquids obtained as different mass fractions of partial melting from source material of the same bulk composition, travelling along different mantle flow-lines through a melting regime, can ...
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(2003)We have performed atomistic computer simulations on trace element incorporation into the divalent dodecahedral X-sites of pyrope (Py — Mg3Al2Si3O12) – grossular (Gr — Ca3Al2Si3O12) solid solutions. An ionic model and the ...
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(2004)Pegmatite quartz from different occurrences in Norway and Namibia was investigated by a combination of ICP-MS, Electron Spin Resonance (ESR), Capillary Ion Analysis (CIA) and Gas Chromatography (GC) to quantify trace ...
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(1995)We have measured amphibole-melt and phlogopite-melt partition coefficients (D) for 22 trace elements in experimentally crystallized natural basanites with the ion microprobe. The synthesized phases display an exceptional ...
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(2003)Baddeleyite (ZrO2) is an accessory phase in a wide range of rocks ranging from kimberlites to carbonatites. Despite an increasing interest in baddeleyite especially in the fields of geochronology and petrology, there is, ...
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(1999)Partition coefficients for Rb, Sr, Sm, Nd, U, Th, Pb, La, Ce, Ba, Nb, and Li between phlogopite, clinopyroxene and melt were determined in order to characterize the effect of metasomatically grown minerals on the isotopic ...
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(2000)We present results from an ion microprobe study of REE-doped and natural concentration plagioclase-basalt run products of Drake (1972) that carries on from our earlier study (Bindeman et al., 1998). The goals of this work ...
Now showing items 16166-16185 of 39124