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Now showing items 13890-13909 of 39124
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(2003)Reproducibility of Re-Os molybdenite ages depends on sample size and homogeneity, suggesting that Re and Os are decoupled within individual molybdenite crystals and do not remain spatially linked over time. In order to ...
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SUBLACUSTRINE MUD VOLCANOES AND METHANE SEEPS CAUSED BY DISSOCIATION OF GAS HYDRATES IN LAKE BAIKAL (2002)Four lake-floor seeps have been studied in the gas-hydrate area in Lake Baikal's South Basin by using side-scan sonar, detailed bathymetry, measurements of near-bottom water properties, heat-flow measurements, and selected ...
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(2001)Recent studies of turbidite bed thickness distributions have demonstrated power-law as well as log-normal statistical distributions. The different distributions may reflect different fan processes and environments and, ...
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(1990)The temperatures and pressures under which gas hydrates may exist occur in areas with a thick permafrost layer and in most pelagic basins of the ocean. However, hydrates are not found in all zones where such conditions ...
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(PANGAEA, 2010-05-06)High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitøya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of ...
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(1999)Submarine pillow basalt lavas with and without glassy crusts are known to differ in structure. A possible cause of thick glassy crust formation is the presence of large amounts of fluids (water) dissolved in the lava, which ...
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(1999)Lineated sheet flows are flat-lying, glassy lava flows characterized by a regular surface pattern of parallel grooves or furrows aligned with the flow direction. They are unique to the submarine environment. We propose ...
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(1988)The authors have estimated the structural perfection (CSR and MD)2 of real crystals in specially selected suites of todorokite samples that were taken from two types of such crusts, differing in age, structure and mineral ...
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(2004)The frequency of oscillations in global ice volume as determined by dating of coral reef deposits provides an important test of the Milankovitch model of orbital climate forcing. The timing of two episodes of high sea level ...
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(2003)Recent research on volcanic-hosted massive sulfide (VMS) deposits indicates that syngenetic subsea-floor replacement ores form an important component of many deposits. In the context of VMS deposits, subsea-floor replacement ...
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(1997)Diverse subsidence geometries and collapse processes for ash-flow calderas are inferred to reflect varying sizes, roof geometries, and depths of the source magma chambers, in combination with prior volcanic and regional ...
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(1997)The crystal structure of a technogeneous Fe3+-rich diopside from the Chelyabinsk coal basin, Southern Urals, has been refined from X-ray powder diffraction data (CoKα, radiation) using the Rietveld method (Rwp = 0.049). ...
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(2002)The phase relations and the element partitioning in a mid-oceanic ridge basalt composition were determined for both above-solidus and subsolidus conditions at 22 to 27.5 GPa by means of a multianvil apparatus. The mineral ...
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(1995)Subsolidus phase relations have been determined in the systems SiO2-Cr-0 and MgO-SiO2-Cr-O in equilibrium with metallic Cr, at 1100–1500°C and 0–28?8 kbar. There are no ternary phases in the SiO2-Cr-O system at these ...
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(1989)Carbonatites associated with alkalic rock complexes in India and in the USSR in the Murun pluton have a unique carbonate component. Though dominated by calcite (59 to 63 mole percent), it also is unusually high in strontianite ...
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(1997)In an attempt to elucidate the relationship between the cumulate eucrites and the noncumulate (main series) eucrites, we have examined the trace-element systematics of plagioclase grains that coexist with inverted pigeonites ...
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(1987)Endogene calcite is a reliable indicator of postcrystallization transformations. The most important indicator of subsolidus transformations in high-temperature endogene calcite is the decomposition of its solid solutions, ...
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(2002)A substantial effort has been devoted in the past toward modeling earthquake source mechanisms as dynamically extending shear cracks. Most of the attention was focused on the subsonic crack speed regime. Recently, a number ...
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(1998)Data on stratigraphy and foraminifers from the Paleocene and Eocene deposits in western Siberia are correlated and the boundaries between the two series are verified. New results for boreholes 1, 2, 3, and 4 on the Kaimysov ...
Now showing items 13890-13909 of 39124