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Now showing items 16146-16165 of 39124
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(1999)We have determined the three-dimensional form of leucosome in two migmatites produced by syntectonic anatexis of different protoliths: (1) stromatic migmatite derived from pelite, which comprises sheets of leucosome ...
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(2003)The distribution of bonds associated with the M2 sites in various well-ordered pyroxene minerals is determined using a topological analysis of electron density in the manner proposed by Bader (1998). Each M2 atom is bonded ...
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(PANGAEA, 2008-07-10)
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2019)The research focused on the composition of tourmaline from tin ore deposits and ore occurrences within the Verkhneurmiysky ore cluster in the Amur region. The aim of the study is to determine the indicative signs of ...
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(1999)Because of a recent increase in interest in the properties of the calcite surface, there has also been an increase in activity toward development of mathematical models to describe calcite's surface behaviour, particularly ...
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(2004)Although glass corrosion resistance has been tested with laboratory methods for decades, investigators are now just beginning to understand the reaction phenomena at or close to saturation with respect to the rate-limiting ...
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(2003)The present paper is a report of work completed by the group 'Friends of Paleobiogeography' on the principles of palaeobiogeographic classification and nomenclature of palaeobiogeographic units (biochoremas). These principles ...
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(2001)Recent studies of the palaeomagnetic field behaviour over the past 5 Myr rely on statistical analysis of mainly directional data. However, the data are quite sparse and ill-distributed, and directional parameters are ...
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(1996)Using relative paleointensity estimates derived from twelve globally distributed pelagic sediment cores, we assess whether they record a signal consistent with that expected from a dominant geocentric axial dipole. The ...
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(2003)Siderite (FeCO3), rhodochrosite (MnCO3), and vivianite ([Fe3(PO4)2] · 8 H2O) are well-known authigenic minerals in a number of sedimentary settings. Here, we explore the potential of low-temperature mineral magnetic ...
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(1995)Ion microprobe measurements of REE (rare earth element) and other selected trace and minor element concentrations were made in clinopyroxene, olivine, feldspar, and chlorapatite in Chassigny and the three nakhlites (Nakhla, ...
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(1995)The carbonaceous chondrite Acfer 182 contains Ca,Al-rich inclusions (CAIs) that differ from most CAIs in other meteorites. Many of them contain grossite (CaAl4O7), whose modal abundance exceeds 30 vol % in most of these ...
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(2002)¶Silicates intergrown with diamonds from 10 diamondites (polycrystalline diamonds, framesites) have been analysed for trace element contents by laser ablation ICP-MS. The diamondites are fine- (< 100 µm) to coarse-grained ...
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(1991)Ureilites including ALHA77257, ALH82130, PCA82506, Kenna, and Novo Urei were analyzed using neutron activation analysis for Ca, Sc, Cr, Mn, Fe, Co, Ni, Zn, Ga, REE, W, Re, Os, Ir, and Au. Bulk and acid-treated samples were ...
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(1998)Liquid immiscibility is an important magmatic process that causes unmixing of magmas into liquids of contrasting compositions. Such magmas may get modified by simultaneous wall rock assimilation and fractional crystallization ...
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(1997)The Kamchatka arc (Russia) is located in the northwestern Pacific Ocean and is divided into three segments by major sub-latitudinal fault zones (crustal discontinuities). The southern (SS) and central (CS) segments are ...
Now showing items 16146-16165 of 39124