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Browsing ELibrary by Title
Now showing items 9086-9105 of 21936
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(2001)Mineralogical and geochemical evidence indicates that peridotites of the ophiolite complex (spinel lherzolites, spinel harzburgites, dunites, and wehrlites) in Cape Povorotny were produced during a single magmatic episode ...
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(2002)The central part of the Voronezh crystalline massif was determined to contain the following three petrochemical types of metapelites: (1) K-poor magnesian and aluminous cordierite–gedrite–anthophyllite schists, (2) K- and ...
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(2002)The subducted lithosphere is composed of a complex pattern of chemical systems that undergo continuous and discontinuous phase transformation, through pressure and temperature variations. Volatile recycling plays a major ...
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(2002)The Burakovka layered pluton of basic and mafic rocks is the largest intrusive massif in the Baltic Province composed of Si- and Mg-rich boninite-like rocks. The pluton consists of two individual bodies, each having its ...
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(2001)The subalkaline magmatism in the western slope of the Urals is an indicator of rifting processes, which accompanied the splitting of the Rhodinia supercontinent at the boundary of the Late Proterozoic and Early Paleozoic. ...
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(2001)The Lashkerek caldera filled with acid volcanic products is situated in the Kurama Ridge near Tashkent (Uzbekistan). These eruptions of the Late Paleozoic time were predominantly of the explosive type. The erupted complex ...
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(2001)The paper discusses the current ideas of regional magnetic anomaly sources and experimental evidence for the formation and behavior of various magnetic minerals within a wide range of pressure, temperature and oxygen ...
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(2003)The chemical and mineralogical composition, structure and petrophysical properties of volcanic rocks, composing three Quaternary volcanoes of Spitsbergen island - Sverrefjellet, Halvdanpiggen and Sigurdfjellet - have been ...
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(2006)Описан новый род органостенных микрофоссилий Petsamomyces Belova, gen. nov. предположительно грибной природы, установленный в черных сланцах печенгского комплекса раннего протерозоя (Кольский п-ов). Находка свидетельствует ...
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(1997)We have modified methods currently used to determine Os isotope ratios with NiS fire assay preconcentration to allow measurement of PGE concentrations and Os isotope ratios on the same sample powder. Samples are spiked ...
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(2003)Data on the PGE-bearing potential of the Syum-Keu massif (Polar Urals) were obtained for the first time. Two types of PGE mineralization, associated with chromite ores and sulfide occurrences, were established. The following ...
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(2003)Boron, carbon and oxygen isotopic compositions were determined at the micrometre scale by high-resolution ion microprobe in a sample of modern coral (massive hermatypic coral, Porites lutea). The ion probe data show for B ...
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(2004)This chapter presents an overview of the distribution, current tectonic position and mode of origin of the remnants of oceanic basement rocks in the Altaids as likely analogues of similar rocks in many Precambrian, but ...
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(2001)The theory and use of geochemical modeling of the long-term carbon cycle and four paleo-PCO2 proxies are reviewed and discussed in order to discern the best applications for each method. Geochemical models provide PCO2 ...
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(2004)Based on ore-formation analysis, the distribution and deposition conditions of exogenic copper and precious metal (Ag, Pt, Pd, Au) ores within the sedimentary cover of the East European Platform are examined. Three main ...
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(2002)Sr concentrations in Phanerozoic biological calcite suggest a close link between fluctuations in the Sr/Ca ratio of seawater, aragonite versus calcite sedimentation, and the Mg/Ca ratio of seawater, the entire chain being ...
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(2000)The development history of striate miospores is considered. These miospores appeared first by the end of the Silurian-the beginning of the Devonian. During the existence period of striate miospores that lasted more than ...
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(2001)2000.08 Phanerozoic tectonic evolution of the Circum-North Pacific Author: Nokleberg, Warren J; Parfenov, Leonid M; Monger, James W H; Norton, Ian O; Khanchuk, Alexander I; Stone, David B; Scotese, Christopher R; Scholl, ...
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(2000)X-ray phase analysis of clays is difficult because these materials generally consist of a mixture of different phases, i.e., mixed-layer minerals, individual clay minerals (non mixed-layer), and associated minerals, such ...
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(1996)Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. A similar crystalline to highly disordered solid phase transition is reported in this study ...
Now showing items 9086-9105 of 21936