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Browsing ELibrary by Title
Now showing items 4520-4539 of 21768
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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 ...
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(2005)The standard enthalpy of formation of thorite and huttonite and the enthalpy of the phase transition between these polymorphs were determined using high-temperature oxide melt solution calorimetry and transposed temperature ...
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(2003)Fine-grained, angular black clasts with longest dimensions up to 800 μm were found, dispersed in a brecciated region in the Tsukuba meteorite. The clasts, much darker than the dark portions of the light-dark structure in ...
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(2004)The southwestern flank of the Baikal Rift Zone (BRZ) extends in the submeridional direction from the southern end of Lake Baikal in the east to the northern end of Lake Khubsugul in the west. It is a central depression ...
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(2004)Products of mud-volcanic activity are formed as a result of interaction between many natural factors, including dehydration of clay minerals, synthesis of hydrocarbons, evaporation, and condensation. These processes obviously ...
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(2002)Deep lithospheric roots, commonly extending to the diamond stability field, are distinctive characteristics of Archean cratons, but their origin remains controversial. The 2.7 Ga Abitibi greenstone belt initially developed ...
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(2001)Changing stresses in multi-stage caldera volcanoes were simulated in scaled analogue experiments aiming to reconstruct the mechanism(s) associated with caldera formation and the corresponding zones of structural weakness. ...
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(2004)Studies of iron-bearing silicate melt (ferrobasalt) þ iron metallicphase þ graphite þ hydrogen equilibria show that carbon andhydrogen solubilities in melts are important for the evolution of theupper mantle. In a series ...
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(2004)This study attempts to identify the astrophysical setting in which properties of the Ca,Al-rich inclusions (CAIs) found in chondritic meteorites are best understood. Importance is attached to the short time period in which ...
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(2002)Recent experimental studies have suggested that colloidal silica can form in high-T (300 to >700°C) hydrothermal fluids (Wilkinson et al., 1996). Natural evidence in support of this was found by Williamson et al. (1997) ...
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(2003)The role of aluminum and silica in the formation of colloids during granodiorite weathering was studied on the basis of long-term experiments in batch reactors. Rock samples were dissolved in un-buffered solutions of initial ...
Now showing items 4520-4539 of 21768