Results 191 to 200 of about 9,703 (232)
Lithos, 2017 To provide new insights into the origin of megacrysts and metasomatism of the subcontinental lithospheric mantle (SCLM), we present a detailed petrographic and geochemical investigation of clinopyroxene-phlogopite xenoliths and clinopyroxene megacrysts ...
A V Kargin +2 more
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Physics and Chemistry of Minerals, 2005
A single-crystal of composition CaNiSi2O6 (space group C2/c) was investigated at high pressure up to about 7.8 GPa by X-ray diffraction. The unit-cell parameters were measured at 18 different pressures. The P-V data were fitted by a third-order Birch-Murnaghan equation of state V0=435.21(1) A3, K 0=117.6(3) GPa and K′=6.4(1).
NESTOLA, FABRIZIO +3 more
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A single-crystal of composition CaNiSi2O6 (space group C2/c) was investigated at high pressure up to about 7.8 GPa by X-ray diffraction. The unit-cell parameters were measured at 18 different pressures. The P-V data were fitted by a third-order Birch-Murnaghan equation of state V0=435.21(1) A3, K 0=117.6(3) GPa and K′=6.4(1).
NESTOLA, FABRIZIO +3 more
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Properties of clinopyroxene LiFeGe2O6
Physics of the Solid State, 2010The polycrystalline compound LiFeGe2O6 has been synthesized by the solid-phase reaction. The X-ray diffraction, Mossbauer, calorimetric, and magnetic investigations have been carried out. The Mossbauer spectrum at 300 K represents a single quadrupole doublet.
T. V. Drokina +9 more
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Clinopyroxene dissolution in basaltic melt
Geochimica et Cosmochimica Acta, 2009Abstract The history of magmatic systems may be inferred from reactions between mantle xenoliths and host basalt if the thermodynamics and kinetics of the reactions are quantified. To study diffusive and convective clinopyroxene dissolution in silicate melts, diffusive clinopyroxene dissolution experiments were conducted at 0.47–1.90 GPa and 1509 ...
Yang Chen, Youxue Zhang
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Potassium in Clinopyroxene Inclusions from Diamonds
Science, 1991Analytical transmission electron microscopy, electron microprobe analyses, and single-crystal x-ray diffraction data support the conclusion that high potassium contents, up to 1.5 weight percent K 2 O, of some diopside and omphacite inclusions from diamonds represent valid clinopyroxene compositions with K in solid ...
G E, Harlow, D R, Veblen
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Transcrystalline melt migration in clinopyroxene
Contributions to Mineralogy and Petrology, 2010Glass inclusions in clinopyroxene phenocrysts from La Sommata (Vulcano Island, Aeolian Arc) were reheated and submitted to a sustained thermal gradient. Each remelted inclusion undergoes a transient textural and chemical reequilibration and concomitantly begins to migrate along a crystallographic direction, at a small angle with the thermal gradient ...
Sonzogni, Yann +2 more
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Chemical Geology, 1998
Abstract Chemical diffusion of Pb under anhydrous, pO2-buffered conditions has been measured in natural clinopyroxenes of two different compositions: one a near-end-member diopside and the other of more iron-rich composition (∼40% diopside component).
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Abstract Chemical diffusion of Pb under anhydrous, pO2-buffered conditions has been measured in natural clinopyroxenes of two different compositions: one a near-end-member diopside and the other of more iron-rich composition (∼40% diopside component).
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Lithos, 2008
Abstract Eclogite is one of the major types of xenoliths in kimberlite. An investigation of such xenoliths provides important constraints on the distribution of P and T within the upper mantle and its chemical composition. Garnet–clinopyroxene and clinopyroxene barometers are proposed for mantle eclogites and peridotites on the basis of CaTs ...
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Abstract Eclogite is one of the major types of xenoliths in kimberlite. An investigation of such xenoliths provides important constraints on the distribution of P and T within the upper mantle and its chemical composition. Garnet–clinopyroxene and clinopyroxene barometers are proposed for mantle eclogites and peridotites on the basis of CaTs ...
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Hydrothermal clinopyroxenes of the Skaergaard intrusion
Contributions to Mineralogy and Petrology, 1986Magmatic augites reacted with high temperature aqueous solutions to form secondary calcic pyroxenes during the subsolidus cooling of the Skaergaard intrusion. Secondary, hydrothermal clinopyroxenes replace wall rock igneous augites at the margins of veins filled with calcic amphibole. These veins are up to several millimeters wide and tens of meters in
Manning, Craig E., Bird, Dennis K.
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