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Browsing ELibrary by Title
Now showing items 6877-6896 of 21936
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MANGANESE(III) BINDING TO A PYOVERDINE SIDEROPHORE PRODUCED BY A MANGANESE(II)-OXIDIZING BACTERIUM (2004)The possible roles of siderophores (high affinity chelators of iron(III)) in the biogeochemistry of manganese remain unknown. Here we investigate the interaction of Mn(III) with a pyoverdine-type siderophore (PVDMnB1) ...
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(2004)We present results of a study of the 53Mn-53Cr isotope systematics in the enstatite chondrites and achondrites (aubrites). The goal of this study was to explore the capabilities of this isotope system to obtain chronological ...
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(2004)U-Pb- and Ar-Ar-geochronologic data are presented, obtained for Posolnenskii and Nizhnekanskii massifs located in the central and south-western parts of Angaro-Kanskii block and breaking through the metamorphic rocks of ...
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(1994)Glasses from two EPR and two MAR basalts were crushed sequentially to release argon in a stepwise fashion. The results show a variation in ratios within each sample, indicating that the argon trapped in the vesicles has ...
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(2003)Mantle convection models require an initial condition some time in the past. Because this initial condition is unknown for Earth, we cannot infer the geological evolution of mantle flow from forward mantle convection ...
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(2002)Space and time variations in Pb, Sr, and Nd isotope ratios in Late Cenozoic alkali-basalt lavas from the vast East Sayan territory allowed an interpretation of the volcanism evolution in the context of interaction of a ...
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(2001)Because mantle viscosity is temperature-dependent, cold subducting lithosphere should be strong, which implies that the rapid, localized deformation associated with subduction should strongly resist plate motions. Due to ...
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(2001)Digital broadband seismograms recorded from 1988 to 2000 at the stations of MDJ and HIA were used to study the mantle discontinuities and the influence of subducting slab under the Japan Sea on the 660km discontinuity ...
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(1995)The strong control that the endothermic phase change from spinel to perovskite and magnesiowustite at a depth of 660 km has on mantle convection is discussed. The phase transition determines the morphology and length scales ...
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(1989)Despite recent geochemical studies advocating an origin of eclogite xenoliths in kimberlite by subduction of altered sea-floor basalts and crustal cumulates, there are numerous examples showing abundant exsolution of garnet ...
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(1996)Laboratory models of lithosphere necking have been used to study the modes of passive margin formation and related mantle exhumation at continent-ocean boundary. Four-layer models were constructed with sand and silicone ...
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(2002)The isotopic composition of He and Ar was analyzed in rocks and minerals from the Early Protero-zoic Litza-Araguba diorite-granite complex in the northwestern part of the Kola Peninsula. The initial 4He/3He ratio of the ...
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(1996)A total dissolution technique has been developed and used to identify and quantify the incompatible element contents of fluids trapped in inclusions in minerals from peridotite xenoliths using ''fluids'' in the generic ...
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(1988)The trace element composition of basalts dredged at the axis of the Mid-Atlantic Ridge between 12°N and 17°N by the R/V “Akademik Boris Petrov” demonstrates the presence of a high-amplitude geochemical anomaly, centered ...
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(1994)Analyses of 227 rocks from fifty localities throughout the world showed that mantle derived rocks such as tectonized peridotites in ophiolite sequences (tectonites) arid peridotite xenoliths in alkali basalts contain heavier ...
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(2002)Observations of the geochemical diversity of mid-oceanic ridge and ocean-island basalts have traditionally been attributed to the existence of large-scale mantle heterogeneity. In particular, the layered convection model ...
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(1993)The apparent distinction between atmospheric and mantle²⁰Ne²²Ne ratios may provide a technique to quantify air contamination in mantle-derived materials. In the absence of mantle nuclear reactions, which produce either²⁰Ne ...
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(2001)This paper interprets the conditions of plume formation with a focus on interpretations of origin at the core-mantle boundary. We also discuss important geological manifestations including formation of alkaline-basalt ...
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(2003)The periodicity of plume magmatism has been reviewed in this paper, which also demonstrates a correlation between trap magmatism and Permo-Triassic granitoids as well as general regularities of collision and postcollision ...
Now showing items 6877-6896 of 21936