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Now showing items 6459-6478 of 39004
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(2001)Microphenocrysts of chromian spinel in glass from an East Pacific Rise lava and three Icelandic subglacial lavas show a variety of complex skeletal, hopper, vermiform and chain textures. These grains of chromian spinel are ...
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(2001)We explore the role played on the growth of shallow-water carbonates by changes in accommodation using case studies from Late Quaternary to modern carbonate environments, i.e. coral reefs and carbonate platforms and ramps. ...
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(2003)Disc-shaped methane bubbles, often observed in marine sediments, result from growth in a medium that elastically resists expansion of the bubbles and yields by fracture. We have modeled this process to obtain estimates of ...
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(2004)Interaction of concentrated acidic uranyl-bearing solutions at initial values of pH of 2.5 and 4.5 with calcite at 25°C in an open system results in formation of schoepite, becquerelite and wyartite-II. Interaction of ...
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(1989)We investigated ferromanganese nodules primarily in order to obtain new data on the concentrations and isotopic composition of He, Ne and Ar in them; the objective was to determine whether they contained space dust and to ...
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(2004)With uranium rich skeletons and density bands similar to their surface coral counterparts, deep-sea scleractinia are a promising archive of past climate. To improve the utility of fossil samples as monitors of deep ocean ...
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(1998)Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The ...
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(PANGAEA, 1947-08-01)Eine Reihe von Untersuchungen, die zum größten Teil in den Jahren 1941-44 durchgeführt worden sind, brachten neue Aufschlüsse über das Klima der freien Atmosphäre über dem Riesenraum Sibirien und dem angrenzenden Sektor ...
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(2002)Grus is an ill-defined product of deep weathering of coarse-grained rocks whose relationships to other weathering changes remain unclear. This paper attempts to address this issue by reviewing a number of examples of coarse ...
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(2002)A new genus of the family Ideliidae, Tshekardelia media gen. et sp. nov., is described from the locality of Tshekarda, the Lower Permian of the Ural Mountains. The species Sylvidelia latipennis Martynov, 1940, is redescribed.
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(2003)The great bulk of massive sulfide deposits in the Urals are related to Paleozoic basalt-rhyolite and basalt-andesite-dacite-rhyolite volcanic rock associations of ensimatic island arcs. According to Ivanov and Loginov [1], ...
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(2003)Assessing the impacts of climatic and, in particular, land use changes on rates of soil erosion by water is the objective of many national and international research projects. However, over the last decades, most research ...
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(2001)In the middle Miocene Badenian gypsum basin of the Carpathian Foredeep, west Ukraine, three main zones of gypsum development occur in the peripheral parts of the basin. Zone I consists entirely of stromatolitic gypsum ...
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(1996)The growth inhibiting and habit modifying effect of phosphonic acid derivatives (HEDP, ENTMP) and carboxylates (tartrate, citrate) on gypsum was investigated by in-situ Scanning Force Microscopy (SFM). Kinetic and morphological ...
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(2001)The engineering properties of gypsum/anhydrite change as a consequence of groundwater, pressure and heat. Gypsum and anhydrite may experience dissolution in the near-surface zone and along the discontinuities, creating ...
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(2000)Gyrotropic properties of clayey sands and sandy clays have been investigated by acoustic measurements at frequencies of about 400 Hz in up to 18 m deep boreholes, using a special contact sonde with piezoelectric transducers. ...
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(2000)The mechanism of origin of gyrotropy in a geologic medium has been simulated by models for grainy and thin-layered media having a dis symmetric microstructure. Calculation of displacements and stresses caused by a seismic ...
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(1995)After conversion of water to H2 gas with zinc for DH ratio determination, hydrogen gas can be absorbed by the zinc during cooling, resulting in H isotope fractionation. Thermal release and subsequent DH ratio determination ...
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(1996)Активность H2O в концентрированных NaCl р-рах измерялась при 600-900°C и 2-15 кбар и при концентрациях NaCl до насыщения по галиту при снижении равновесной дегидратации в бинарной системе синтетических брусит-периклаз. ...
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(2002)We present experimental results constraining water activity in H2O-N2 fluids containing 40–90 mol% water at pressures of 6–13 kbar and temperatures of 680–840 °C. In the experiments, the displacement of the brucite dehydration ...
Now showing items 6459-6478 of 39004