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Now showing items 6984-7003 of 43490
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(2006)The Lost City Hydrothermal Field at 30?N, near the Mid-Atlantic Ridge, is an off-axis, moderate temperature, high-pH (9-10.8), serpentinite-hosted vent system. The field is hosted on ?1.5 Ma crust, near the summit of the ...
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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2017)
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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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(2011)The Altai-Sayan Fold Belt epitomises how Phanerozoic island-arc continental crust contributed to the growth of the Palaeo-Eurasian continent. Its formation is dominated by the closure of the Palaeo-Asian Ocean (PAO) when ...
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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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(2006)Aiming at two Dayao earthquakes with magnitude more than 6 occurred in 2003 in Yunnan Province, we analyzed and interpreted the NOAA satellite thermal infrared images of 1999, 2003 and 2004 in Chuandian region, and also ...
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(PANGAEA, 2008-08-20)In this paper allivalites, coarse- and giant-textured olivine-anorthite rocks occurring as separate blocks in the eruption products of many volcanoes from the frontal part of the Kuril-Kamchatka Arc are under consideration. ...
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(2006)The Muya structural zone, one of the regions with a high potential of gold mineralization, incorporates more than 300 gold occurrences and deposits. Ore occurrences of the gold–quartz formation are most widespread in this ...
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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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(Федеральное государственное автономное образовательное учреждение высшего образования «Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики», 2018)Here, we propose a formation mechanism for core-shell nanoparticles by self-organization in coprecipitated mixed hydroxides under hydrothermal conditions. A thermodynamic reason for this process is because of a decrease ...
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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 ...
Now showing items 6984-7003 of 43490