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Browsing by Title
Now showing items 5733-5752 of 39004
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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, ...
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(2004)Detailed geological, geochemical and biostratigraphic studies of rocks from basaltic-sedimentary terranes in the Kurai and Katun accretionary wedges (Vendian-Middle Cambrian units), the Charysh-Terekta strike-slip zone ...
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(2000)Pyrite framboids have been synthesised as the product of the oxidation of FeS (mackinawite) by H2S in aqueous solutions at pH 6, Eh > -250 mV and temperatures above 60°C in the absence of detectable O2. Under these conditions ...
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(2003)The three piston cores, collected from the East Sea, were analyzed to detect changes of sedimentary environment during the late Quaternary. The cores consist mainly of muddy sediments that are interbedded with silty sands, ...
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(1989)Ore consisting primarily of francolite and groutite was found in Siberia in an ultramafic pluton consisting of alkalic rock and carbonatites. Groutite has not previously been reported in carbonatite complexes; the hand-books ...
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(1989)The Vishnevogorisk alkalic complex in the Urals is one of the mineralogically best studied complexes of such rocks in the USSR. More than 200 minerals (plus varieties) are now known here. In 1986, while studying mineralized ...
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(2001)The first records of Frasnian Rugosa from Mongolia are discussed, including Nicholsoniella golovtshenkoae sp. nov., N. hurenensis sp. nov., Aulacophyllum exiguum sp. nov. and Temnophyllum ruzhentsevi sp. nov.
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(2002)We derive a 3D Frechet sensitivity kernel relating the rms amplitude of a far-field, broad-band body-wave pulse to laterally heterogeneous seismic slowness variations within the earth. Unlike the 'banana-doughnut' sensitivity ...
Now showing items 5733-5752 of 39004