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Browsing ELibrary by Title
Now showing items 4560-4579 of 21934
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(2001)Fore-reef carbonate production is important but is poorly known as a result of methodological limitations. This paper reports on the development of a regional census-based method to calculate the average carbonate production ...
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(2002)An autocovariance forecasting procedure for single location ionospheric characteristics is presented. Its accuracy is illustrated as a function of the amount of time extrapolation for selected European stations under quiet ...
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(2003)Forecasting is a central goal of volcanology. Intensive monitoring of recent eruptions has generated integrated time-series of data, which have resulted in several successful examples of warnings being issued on impending ...
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(1997)As the regions around active volcanoes succumb to large increases in population, particularly in the developing world where most of the high-risk volcanoes are located, the threat posed by eruptions becomes increasingly ...
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(2002)The 5,575-km2 Academy of Sciences Ice Cap is the largest in the Russian Arctic. A 100-MHz airborne radar, digital Landsat imagery, and satellite synthetic aperture radar (SAR) interferometry are used to investigate its ...
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(2004)Formal analysis of argon isotope distribution in minerals in terms of Fick's and Arrhenius laws demonstrated that the linear dependency 36Ar/40Ar-39Ar/40Ar is a true isochron with all the corresponding regressions and ...
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FORMATION AND DEVELOPMENT OF NORMAL-FAULT CALDERAS AND THE INITIATION OF LARGE EXPLOSIVE ERUPTIONS (1998)The ring fractures that form most collapse calderas are steeply inward-dipping shear fractures, i.e., normal faults. At the surface of the volcano within which the caldera fault forms, the tensile and shear stresses that ...
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(2002)The tectonic activity of the Earth allowed exchange of volatile elements (H, C, N, rare gases) between the surface of the Earth (atmosphere, crust, sediments, oceans) and the mantle. However, some of these elements still ...
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(1997)Group A5 chondrules have FeO-rich olivines (>4 wt% FeO) and albite-normative mesostases and thus are discrete from the major primary chondrule groups. Group A5 chondrules in six LL chondrites have been studied by ...
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(2001)The petrology and geochemistry of shallow continental lithospheric mantle (SCLM) can be studied via (1) tectonically emplaced ultramafic massifs and (2) mantle xenoliths entrained in alkaline magmas. Data from these two ...
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(1998)The morphology and stoichiometry of feldspathic glass in the Martian meteorite ALH84001 indicates it is maskelynite (a diaplectic glass) rather than a flowed glass, although this glass was heterogeneously affected by a ...
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(1997)One of several natural muscovites or illites, kaolinite, and quartz or amorphous silica were equilibrated in 2 M KCl/HCl solutions in hydrothermal experiments designed to investigate the stability, composition, and structure ...
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(2004)Schwertmannite (ideal formula: Fe8O8(OH)6SO4) is typically found as a secondary iron mineral in pyrite oxidizing environments. In this study, geochemical constraints upon its formation are established and its role in the ...
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(2003)The paper considers the results of geochemical studies of gold-silver ore-magmatic systems and deposits in two of the largest ore districts of the northern Okhotsk region: the Evensk (Turomchinsk ore-magmatic system, the ...
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(2003)The distribution and occurrence forms of platinum group elements (RPGE) were studied in detail in chromite ores of the Kempirsai ore field. The compositions, phase relations, and fine structure of representative aggregates ...
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FORMATION DYNAMICS OF THE MIDDLE RIPHEAN RIFTOGENIC STRUTURE (WESTERN SLOPE OF THE SOUTHERN URALS) (2004)Based on the model of continental riftogenesis the Middle Riphean evolution of the study region was marked by the confinement of the maximal tension to its central part and the formation of grabens filled with coarse- to ...
Now showing items 4560-4579 of 21934