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Now showing items 7965-7984 of 39126
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(2004)Petrographic, fluid-inclusion, geochemical, and gas stable isotope data are reported here for a Permian Zechstein evaporite sequence. This deposit is a geochemically unaltered sequence. Bromine concentrations show a ...
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(2000)Changes in the spatial organization of water masses in sea basins may represent one of the causes responsible for crises in the biosphere. Based on the analysis of experimental data and observations in modern sea basins, ...
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(2001)We have calculated long-term erosion rates of 20-100 mm/kyr from quartz-contained 10Be in the bedload of middle European rivers for catchments ranging from 102 to 105 km2. These rates average over 10-40 kyr and agree broadly ...
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(2005)Edifices of stratocones and domes are oftensituated eccentrically above shallow silicic magmareservoirs. Evacuation of such reservoirs forms collapsecalderas commonly surrounded by remnants of one orseveral volcanic ...
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(2000)Large-scale, lateral fluid flow through oceanic crust provides an explanation for regionally low heat flow in several seafloor settings. A well-mixed aquifer (WMA) model provides a quantitative and conceptual tool for ...
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(2001)Stresses in the lithosphere are one indication of processes in the Earth interior: here we present a calculation of large-scale lithospheric stresses caused by global mantle circulation. The mantle flow field is calculated ...
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(2004)There is a debate on the behavior of Re and Os during mantle metasomatism. Some argue that the mantle can acquire high 187Os/188Os (0.15 to >1.0) either directly from metasomatic events or by the growth of 187Os from 187Re ...
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(2002)The continental slopes of the pan-Arctic region exhibit a range of morphological expression inherently related to different styles of glaciation and sediment delivery to the slope. This study examines the basic associations ...
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(2010)The Kamchatka Peninsula in far eastern Russia represents the most volcanically active arc in the world in terms of magma production and the number of explosive eruptions. We investigate large-scale silicic volcanism in the ...
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(1997)Laser 40Ar-39Ar ages were obtained from a series of replicate illite samples ranging in mass from 14 to 77 μg using vacuum-encapsulated irradiation, and the results were compared with earlier analyses of the same material ...
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(2004)Single grains of detrital white mica from two different synorogenic sediments in the Southern Urals were analysed using the insitu ultraviolet laser ablation Ar609 Ma age group is phengitic in composition (Si 3.3732 Ma age ...
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(1997)Fine-grained (<0.02 μm) to coarse-grained (2.0-0.2 μm) illite separates and finely powdered muscovite standards were analyzed with a microencapsulation technique and an laser microprobe. The integrated ages of the illite ...
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(1995)Details are given of the elemental analysis of single fluid inclusions using a UV laser ablation microprobe interfaced to an inductively coupled plasma mass spectrometer. The UV laser, a frequency quadrupled Nd:YAG operating ...
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(2002)Quantifying and monitoring of many natural hazards requires repeated measurements of a topographic surface whose change reflects a geological or geophysical process. Topography and topographic change measurements are ...
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(2002)Laser sulfur combustion in the presence of O2 is the most commonly used method of in situ sulfur isotope analysis. Previous workers indicated that a small but reproducible fractionation of 34S/32S exists between the product ...
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(2004)The Holocene estuarine silts of the Severn Estuary Levels (southwest Britain) are representative of their kind in northwest Europe. They contain two broad types of plant material: particles codeposited with mineral grains ...
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(2004)Metamorphic remobilization of arsenopyrite-rich ores is a globally important process which can lead to significant concentrations of gold. In order to understand this and related processes, relations of sulphur isotopes ...
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LASER OXYGEN ISOTOPE ANALYSIS OF SILICATE/OXIDE GRAIN SEPARATES: EVIDENCE FOR A GRAIN SIZE EFFECT? (1996)285 oxygen isotope analyses of grain separates of quartz, biotite, muscovite, aegirine, actinolite, olivine and chromite were carried out by laser fluorination using BrF5. Two of the eleven samples analyzed are oxygen ...
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(1995)Combined microthermometric and laser Raman microspectroscopic techniques were used to investigate the compositional effects of gas hydrates (clathrates) on the residual fluid in aqueo-carbonic fluid inclusions. By attaching ...
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(1999)Laser shock experiments with olivine have been carried out in order to test the capability of this new experimental approach to produce known shock defects in olivine. To determine the shock conditions, numerical simulations ...
Now showing items 7965-7984 of 39126