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Now showing items 11918-11937 of 43490
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(2003)Vaterite, a rare hexagonal CaCO3 Polymorph, was identified in precipitates forming at a supraglacial sulfur spring, in Borup Fiord Pass, northern Ellesmere Island, Canadian High Arctic. Vaterite occurs in a precipitate ...
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(2006)Naturally weathered feldspar surfaces in the Jurassic Navajo Sandstone at Black Mesa, Arizona, was characterized with high-resolution transmission and analytical electron microscope (HRTEM-AEM) and field emission gun ...
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(2006)The molecular sources, dynamics and analytical characterizations of the phosphorus (P) containing components of marine dissolved and particulate organic matter (OM) are reviewed. Using a combination of 13C and 31P nuclear ...
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(2006)Mantle xenoliths entrained in a newly discovered Late Cretaceous basaltic breccia at Jünan, Shandong Province, China provide important constraints on the nature and evolution of the Late Mesozoic lithospheric mantle beneath ...
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(2004)Eclogites from the Earth's mantle found in kimberlites provide important information on craton formation and ancient geodynamic processes because such eclogites are mostly Archean in age. They have equilibrated over a range ...
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(2006)The Elaziǧ region in SE Turkey comprises, in descending order, the Palaeozoic-Mesozoic Malatya-Keban platform, an ensimatic island arc unit (i.e. Elaziǧ magmatic rocks-Yüksekova complex), and ophiolitic rocks (i.e. Kömürhan) ...
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(2001)The phenomenon of antiordering, i.e., preferred Al occupation of the T-2o position of the albite structure, was observed in a two-phase feldspar from Pektusan Volcano, Primorie. This paper reports the results of the computer ...
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(1988)The paper demostrates that the atmospheric glow phenomenon can be attributed to instability of droplets in a haze (or rain or drizzle) or thawed ice crystals (or rime) in an electric field. The instability results from an ...
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(1994)Using a data bank containing over 325 major-element analyses of biotite minerals from many localities around the world, it is demonstrated that biotite compositions depend largely upon the nature of magmas from which they ...
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(2000)Ophiolites and black shales cut by granitoids associate closely within the Ospino-Kitoi area of the Eastern Sayan. This object is unique in that the diverse rocks occurring in this territory including ultrabasic rocks, ...
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(2004)We have performed dissections of two diamondiferous eclogites (UX-1 and U33/1) from the Udachnaya kimberlite, Yakutia in order to understand the nature of diamond formation and the relationship between the diamonds, their ...
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(PANGAEA, 2001-05-30)In sediments of the Laptev Sea unknown earlier ferromanganese manifestations have been found. On the basis of structural-textural external signs they have been divided to five groups: 1) tube- and spindle-shaped pseudomorphs ...
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(1987)In the vicinity of the Kola superdeep drillhole (SG-3), within the Pechenga volcanotectonic basin and its surroundings a subhorizontal boundary was identified by seismic exploration (deep seismic sounding, DSS) at a depth ...
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(1990)The phenomenon described here as first reported in 1993 by Pustovalov from Cape Balashov, Inostrantsev Bay, Novaya Zemlya Island. A 60 m thick member of jointed bituminous sandstone with partings of bituminous shale was ...
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(1999)Mixed-layer clay minerals are intermediate products of reactions involving pure end-member clays. They come from natural environments ranging from surface to low-grade metamorphic and hydrothermal conditions. Most often ...
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(2004)The structures of sodium silicate and aluminosilicate glasses quenched from melts at high pressure (6–10 GPa) with varying degrees of polymerization (fractions of nonbridging oxygen) were explored using solid-state NMR ...
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(2006)Oil and especially the related associated bitumen, in particular, are characterized by high metal contents with a predominance of V, Ni, and Zn that make up a specific “oil” assemblage. Based on the prevalence of one of ...
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(1988)An experiment has been carried out which demonstrates the mechanism of displacement of blocks in the crust during the propagation of seismic waves. In the crust, with its block structure, there are always some blocks that ...
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(1988)Data obtained earlier by the reflection method [3, 4] enabled rocks of the sedimentary cover in this bay to be divided into two complexes. The upper complex is revealed by long reflecting boundaries, which are virtually ...
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(2006)The nature of the crust in the Laxmi Basin, western margin of India is an uncertain issue; more importantly this has implications on paleo-geographic reconstructions of the western Indian Ocean. We have analysed three ...
Now showing items 11918-11937 of 43490