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Browsing by Title
Now showing items 5744-5763 of 39068
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(2000)Reduction of selenium oxyanions by microorganisms is an important process in the biogeochemical cycling of selenium. Numerous bacteria can reduce Se oxyanions, which are used as electron acceptors during the oxidation of ...
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(1997)The fractionation of silicon isotopes by three species of marine diatoms, Skeletonema costatum, Thalassiosira weissflogii, and Thalassiosira sp., grown in batch culture, is reported. Fractionation was observed for all ...
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(1996)Air sampled from the moist unsaturated zone in a sand dune exhibits depletion in the heavy isotopes of N2 and O2. We propose that the depletion is caused by a diffusive flux of water vapor out of the dune, which sweeps out ...
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(2001)A numerical model of sulfate reduction and isotopic fractionation has been applied to pore fluid SO42- and δ34S data from four sites drilled during Ocean Drilling Program (ODP) Leg 168 in the Cascadia Basin at 48°N, where ...
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(2001)A neutron-activation study of 48 group-IVA irons shows much lower negative slopes on Ir-Au and Ir-As diagrams than observed in the larger magmatic group IIIAB. This difference seems to reflect the tendency of DIr, DAu and ...
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(2004)It is well known that in many cases rock permeability depends upon in situ stress conditions and on the pressure of the flowing fluid. Parallel and quasi-parallel joints represent one of the most often observed permeability ...
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(2001)Shear fracture propagation in rock is accompanied by localized microcracking in a process zone surrounding the fracture tip. We investigated the crack microstructures along experimentally formed shear fractures from four ...
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(2002)Localization of deformation during fracture mechanical tests leads to the development of shear bands. We performed triaxial tests using Sidobre granite at four different confining pressures (from 20 to 80 MPa). We compared ...
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(1997)The internal structure of zircon is commonly revealed by back-scattered electron (BSE) images. Grains from a 750-700 Ma old calc-alkaline mafic metatonalite from southernmost Brazil show relict igneous faces, irregular and ...
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(IOP Publishing, 2016)During the Paleozoic period from the beginning of the Cambrian to the end of the Carboniferous in the boundaries of the West Siberia tectonic depression there occurred the sea, where the carbonate platforms were formed by ...
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(2001)Three types of fracture intersection with bedding contacts have been investigated within numerical experiments: fracture transection through bed contacts, termination (abutment) at contacts and step-over of fractures at ...
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(2004)Direct observations of fractures and tectonic jointing are crucial for the study of fault systems in any region. They provide information needed for the mapping of the internal structure of fault zones, determination of ...
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(2000)Frequency dependent complex electrical conductivity measurements have been made on sandstones saturated with distilled water during triaxial deformation in both drained and undrained regimes. The resulting electrical and ...
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(2002)Fracturing in the Primorsky Fault, a master fault in the Baikal Rift system, is investigated using high-resolution structural data. The fault zone consists of several roughly parallel segments and elongate wedge-shaped ...
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(2002)Fragmentation of vesicular magma by rapid decompression is one of the most likely triggers for explosive eruptions. In this phenomenon the decompression rate and the viscoelastic nature of magma are considered to be key ...
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(2000)We present the first experimental investigation of the fragmentation behavior of two-phase (melt+gas) rhyolitic systems under rapid decompression. Two-phase samples have been generated by foaming water-oversaturated rhyolitic ...
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(1996)The ratio of the volume of vesicles (gas) to that of glass (liquid) in pumice clasts (VG/VL) reflects the degassing and dynamic history experienced by a magma during an explosive eruption. VG/VL in pumices from a large ...
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(2004)The paper presents new data on the structure and composition of the Vendian-Early Cambrian oceanic crust of the Paleo-Asian ocean, which has been fragmentally preserved in Early Cambrian accretionary prisms of Gorny Altai. ...
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(2004)The Altai-Salair area in southern Siberia is a Caledonian folded area containing fragments of Vendian–Early Cambrian island arcs. In the Vendian–Early Cambrian, an extended system of island arcs existed near the Paleo-Asian ...
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(1988)Characteristic features of Late Cenozoic volcanics fringing the Komandor Basin, Bering Sea, are the lateral compositional inhomogeneity, expressed in their enrichment in high-charge lithophile and light rare-earth elements, ...
Now showing items 5744-5763 of 39068