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Browsing ELibrary by Title
Now showing items 13934-13953 of 21821
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(1998)The oxygen isotope ratios of Phanerozoic zircons from kimberlite pipes in the Kaapvaal Craton of southern Africa and the Siberian Platform vary from 4.7 to 5.9‰ VSMOW. High precision, accurate analyses by laser reveal ...
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(1989)Microprobe study of zircon parageneses in migmatites of different origin shows that the geochemical properties of zircon could be used to solve important petrological and geochemical problems. The standards employed for ...
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(2000)The interpretation of metamorphically induced U-Pb isotopic discordance requires a thorough understanding of zircon-fluid interactions. With this aim we have studied the behaviour of metamict and crystalline zircon phases ...
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(2002)With the aim to link zircon composition with paragenesis and thus metamorphic conditions, zircons from eclogite- and granulite-facies rocks were analysed for trace elements using LA-ICP-MS and SHRIMP ion microprobe. ...
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(2004)Oxygen isotope analysis and U-Pb dating were carried out on zircons from granite, granitic gneiss and eclogite in the Dabie-Sulu orogenic belt of east-central China. The results show a wide variation in zircon δ18O values ...
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(2003)Isotopic anomalies in Mo and Zr have recently been reported for bulk chondrites and iron meteorites and have been interpreted in terms of a primordial nucleosynthetic heterogeneity in the solar nebula. We report precise ...
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(1998)Zirkelite, a cubic mineral of general formula (Ti,Ca,Zr)O 2−x occurs as an accessory mineral in phoscorites, carbonatites and associated rocks in the Sebl'yavr complex. After pyrochlore, it is the main mineral concentrating ...
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(2005)Copper and Zn isotope ratios of well-characterized samples from three ore facies in the Devonian Alexandrinka volcanic-hosted massive sulphide (VHMS) deposit, southern Urals, were measured using multi collector ICP-MS ...
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(2005)High-precision Zn isotopic variations are reported for carbonaceous chondrites (CC), equilibrated (EOC) and unequilibrated (UOC) ordinary chondrites, iron meteorites from the IAB-IIICD (nonmagmatic) and IIIA (magmatic) ...
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(1998)The solubility of zincite in mildly to strongly acidic aqueous solutions, according to the reaction ZnO + 2H+ # Zn2+ + H2O, has been measured at ionic strengths of 0.03-1.0 (stoichiometric molal basis) from 50 to 290°C at ...
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(2001)Our detailed petrographic study of the Early Proterozoic metapelites of the Tim-Yastrebovskaya structure resulted in distinguishing the following four metamorphic zones: garnet-chlorite, staurolite-andalusite. staurolite ...
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(2001)A scheme of small mammal (vole) zones is proposed for the Quaternary of Eastern Europe. The zonation is based on the evolutionary appearance of new forms in the Borsodia-Prolagurus-Lagurus, Mimomys-Arvicola, and ...
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(2001)The article highlights the mineral zonality at the Grachevskoe, Kosachinskoe, and Shokpak-Kamyshovskoe uranium ore fields (Northern Kazakhstan) localized in low-temperature sodic metasomatites. The setting of these fields ...
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(1993)The Upper Cretaceous oceanic and island-arc terranes of Northeastern Kamchatka (Russia) are intruded by numerous ultramafic and mafic to intermediate plutons. Ultramafic plutons north of Epilchik Lake show a concentric ...
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(1992)The accumulation of information about the stratigraphic ranges and areal distribution of various groups of fauna and flora has made it possible to pass onto the zonal differentiation of all the systems of the Phanerozoic ...
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(2003)In the mid-Middle Miocene (Konkian Phase), the Eastern Paratethys reestablished a wide connection with the World Ocean. This resulted in the migration of the marine polyhaline molluskan fauna from the Mediterranean. The ...
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(2000)The presence of Zr isotope anomalies in the early solar system is demonstrated with the identification of 92Zr excesses and 96Zr deficits in several chondrites and the CAI Allende inclusions. The isotopic composition of ...
Now showing items 13934-13953 of 21821