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Browsing ELibrary by Title
Now showing items 9714-9733 of 22924
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(2002)Presents an abstract of the article 'Phosphate Mineralogy of NYF-Type Granitic Pegmatites,' by J.W. Nizamoff, A.U. Falster, W.B. Simmons and K.L. Webber presented at the 28th Rochester Mineralogical Symposium.
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(1996)We present a compilation of dissolved phosphate and solid-phase P data from the oceanic crust to evaluate the effects of hydrothermal processes on the oceanic budget of P. Concentrations of phosphate in fluids that emanate ...
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(2001)A direct laser-fluorination (DLF) method is presented for phosphate δ18O analysis (mass 1 - 2 mg). The automated system heats samples in the presence of excess BrF5 using a 25 W CO2 laser, at 10.66 μm. δ18O ratios of the ...
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(2002)The Belaya Zima massif of ultrabasic-alkaline rocks and carbonatites comprises large resources of phosphate-niobium ores, as well as considerable accumulations of tantalum, iron, rare earth elements of the cerium group. ...
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(1989)Jurassic columnar stromatolites are considered to be a rarity in the world; in the USSR they have heretofore never been described. Columnar stromatolites have been found for the first time in the USSR in Late Jurassic ...
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(1996)Acidic macromolecules have consistently been associated with biological mineral formation in vivo. Several of these macromolecules have been shown to induce mineral formation from metastable solutions when attached to a ...
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(2002)Phosphor imaging is a type of digital autoradiography that has been widely used in biochemistry to examine radioactively tagged proteins. We used phosphor imaging to map in situ U and Th in polished slabs of geological ...
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(2003)The intramolecular kinetic oxygen isotope fractionation between CO2 and CO32- during reaction of phosphoric acid with natural smithsonite (ZnCO3) and cerussite (PbCO3) has been determined between 25 and 72°C. While cerussite ...
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(1988)Large high-grade phosphorite bodies were found on the Ogasawara Plateau near the junction of the Izu and the Volcano Trenches, on the 4th cruise of the R/V Akademik A. Nesmeyanov between July and September 1984, as well ...
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(1998)Phosphorites of various types occur in the Phanerozoic sedimentary cover of the Russian Craton. They were deposited in six phosphorite basins, all of which contain economic deposits. These basins are grouped into peri- and ...
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(2001)The structure of the cristobalite-like polymorph of phosphorus oxynitride PON has been refined using neutron powder diffraction data. It is tetragonal, space group I&4macr;2d, Z=4. The four P-(O,N) distances are equal but ...
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(2003)This paper presents the results of a photoelastic and numerical study of stress distributions (contours and trajectories) around fault models of various geometries, submitted to a biaxial compressive load. It aims to ...
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(1998)A tephrochronological study revealed that a phreatomagmatic eruption had occurred ~6500 14C years ago and formed a maar in Lake Karymskoe. Another result of the study was the reconstruction of three episodes of basalt magma ...
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(2004)We have studied textural relationships and compositions of phyllosilicate minerals in the mafic–ultramafic-hosted massive-sulfide deposit of Ivanovka (Main Uralian Fault Zone, southern Urals). The main hydrothermal ...
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PHYLLOSILICATE-RICH CHONDRULE RIMS IN THE VIGARANO CV3 CHONDRITE: EVIDENCE FOR PARENT-BODY PROCESSES (2000)A petrographic and scanning electron microscopic study of the Vigarano CV3 carbonaceous chondrite reveals that a small proportion (~5%) of the fine-grained rims surrounding chondrules consist mainly of phyllosilicates ...
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(2002)Phyllosilicates produced mostly by weathering of magmatic, metamorphic and sedimentary rocks are widespread in the surficial and near-surface zones of the Earth’s crust. These phyllosilicates display very fine grain sizes, ...
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(2002)The history of the study and the development of ideas about the systematic position of the Cambrian univalved mollusks is reviewed. On the basis of the functional morphology of shells (Parkhaev, 2000a, 2001a), the phylogenetic ...
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(2002)Biogeography played an important role in early developments in evolutionary theory and continues to play an important role in evolutionary studies and paleogeographic reconstructions. The development of a phylogenetic ...
Now showing items 9714-9733 of 22924