Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 45 for “"Diopside"”.
-
Water solubility in diopside
(1) Water solubility in pure diopside was measured. Water-saturated diopside crystals were synthesized using piston-cylinder and multi-anvil presses at 20-30 and 100 kbar and 800-1100oC from an oxide and hydroxide starting mixture containing 10 % excess silica. The water concentration in diopside …
-
Brillouin studies of diopside and H2O
… 1, we investigate the elastic properties of diopside, CaMgSi2O6, at ambient pressure and room temperature by Brillouin spectroscopy. The thirteen single-crystal elastic moduli (Cij) of two samples of diopsidic pyroxenes close to the ideal composition from different locations have been …
-
Strontium and samarium diffusion in diopside
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1982.
-
Surface textures on pyrope, picroilmenite and chrome diopside from Kimberlite
… features on pyrope, picroilmenite and chrome diopside from kimberlite gives valuable information on the history of these minerals both during and after kimberlite emplacement. Descriptions and scanning electron photo-micrographs of surface features observed on these mantle-derived minerals …
-
The kinetics of crystal growth in the system diopside - cats and the application of crystal growth theory to some geologic problems
Made available in DSpace on 2014-12-11T18:10:00Z (GMT). No. of bitstreams: 1 7309968.pdf: 2576073 bytes, checksum: e7d64f71b2bc72749c3c19e05c758211 (MD5) Previous issue date: 1972
-
An ion microprobe study of trace element partitioning between clinopyroxene and liquid in the diopside (CaMgSi2O6) - albite (NaAlSi3O8) - anorthite (CaAl2Si2O8) system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
-
Petrology and geochemistry of the diamondiferous K-richteriteand leucite-bearing Kareevlei Kaapvaal lamproite
… mineral chemistry (phlogopite, Krichterite, and diopside), and bulk-rock major and trace elements as well as Sr–Nd isotope compositions. The Kareevlei Kaapvaal lamproites comprise completely altered olivine macrocrysts (3–12 vol.%) set in a groundmass of olivine microcrysts (3–19 vol.%), abundant …
-
A phenomenological treatment of thermal expansion in crystals of the lower symmetry classes and the crystal structures of CaCoSi₂O₆ and CaNiSi₂O₆
… emerald and beryl and for the clinopyroxenes: diopside, hedenbergite, jadeite, ureyite, acmite, and spodumene. The extended Grüneisen equation has been used to further examine the nature of the thermal expansion in emerald, beryl, and diopside. The crystal structures of the synthetic …
-
Gough Island--evaluation of a fractional crystallization model and an experimental study of the partitioning of a rare earth element in the system diopside/water,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
-
Calc-Silicate Rocks in the Wollaston Lake Area, Saskatchewan
… mineral assemblages in marble are: calcite-diopside-quartz; calcite-diopsioe-biotite:, calcitediopside- idocrase; calcite-dolomite-forsterite-phlogopite: dolomite: calcitesCdPo: Li i.:e-gtduui i.e+d i.op s i.de ; anci in ca.Lc-cs i Li ca t.e rOCKS are: dlopsldeplagioclase; diopside-idocrase; …
-
Inferences on the Structure of Aluminosilicate Glasses: A High Resolution Solid-State Silicon-29 and Aluminum-27 Nuclear Magnetic Resonance Study (magic-Angle)
… glasses and glasses in the system anorthite-diopside-forsterite were examined by high resolution solid-state silicon-29 and aluminum-27 nuclear magnetic resonance (NMR) spectroscopy. High resolution spectra were obtained at high magnetic field strengths (11.7 and 8.45 Tesla) using magic-angle …
-
Kinetics of chemical exchange during melting of planetary interiors
… the diffusion rates of La, Ce, Nd, Dy and Yb in diopside at pressures of 0 to 2.5 GPa and temperatures of 1050 to 1450 'C. The results demonstrate a large variation in diffusivity among the rare earth elements, with the diffusion coefficient for La a factor of -35 smaller than for Yb at a given …
-
Geochemistry and petrogenesis of the Tsirub nephelinite-basanite intrusions, Aus, southern Namibia
… alkali feldspar (orthoclase) and clinopyroxene (diopside and aegerine-augite) occur in the two major intrusive bodies.
-
An experimental approach to thermal and solar weathering of Mercury's crust
… feldspar, enstatite orthopyroxene, and diopside clinopyroxene. Our results indicate that sodium rich feldspars have the potential to contribute sodium to the exosphere, but in order to to produce potassium from the surface, more potassium rich felspars may be necessary. Calcium and …
-
A geochemical study of metasomatised peridotite and marid nodules from the Kimberley pipes, South Africa
… and phlogopite K-richterite peridotites (PKP). Diopside can be present in all four groups. PKP rocks may also contain exotic incompatible element-rich Crtitanates such as lindsleyite and mathiasite, Nb-Cr rutile, ilmenite and armalcolite. Petrographic and chemical evidence presented here suggest …
-
Purely ionic and molecular orbital modelings of the bonding in mineral crystal structures
… model CaCO₃ crystals in the calcite, aragonite, diopside, and perovskite structure types. For calcite and aragonite, the model predicts shorter CO bonds and larger bulk moduli than observed. Modeling of the thermochemistry of CaCO₃ does not reproduce the observed thermochemistry even …
-
The petrogenesis of Liberian diamondiferous rocks, Man Craton, West Africa
… Most importantly, there is no evidence of diopside in the Camp Alpha samples. The Camp Alpha phlogopite is enriched in Al2O3 but slightly depleted in FeO and TiO2 and the spinel exhibits a kimberlitic compositional evolution (i.e., trend 1). The bulk-rock trace element ratios Ba/Nb (0.91 - …
-
Geochemistry of selected South African group I, group II and transitional kimberlites located on and off the Kaapvaal craton
… or calcite, serpentine, phlogopite and diopside (group 11 kimberlites). The transitional kimberlites tend to show intermediate characteristics, with the on-and off-craton transitional kimberlites showing more similarity to group 1 and group 11 kimberlites, respectively.
-
MICROSTRUCTURAL CONSTRAINTS ON THE FORMATIONAL AND THERMAL HISTORIES OF REFRACTORY INCLUSIONS IN CO3 CHONDRITES
… gas under highly dynamic conditions, forming diopside with remarkably wide compositional ranges over submicrometer distances and (3) direct equilibrium condensation of pure diopside from a nebular gas, forming the outermost rim on the exterior of the inclusions. In spinel-hibonite CAIs, the …
-
Kinetic processes of mantle minerals
… processes. Diffusion coefficients of A1 in diopside are experimentally determined, and used for modeling the equilibration of major elements in pyroxene during MORB genesis. In summary, this dissertation contributes two major inferences: the location of the transformation boundaries of the …
Page 1 of 3