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Browsing by Title
Now showing items 12937-12956 of 39126
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(2003)We extend the seismological receiver function method to the exploration seismic domain to solve the problem of shear wave statics for multicomponent data. The method relies on cross-correlation or deconvolution of pressure ...
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(2004)Seismic velocity and attenuation anomalies in the mantle are commonly interpreted in terms of temperature variations on the basis of laboratory studies of elastic and anelastic properties of rocks. In order to evaluate the ...
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(2004)Deformation within shear zones can be both temporally and spatially variable, resulting in multiple generations of folds which display a range of scales and overprinting relationships in mylonitic rocks associated with ...
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(2003)In this paper, we extend the previous studies of semi-brittle flow of synthetic calcite–quartz aggregates to a range of temperatures and effective pressures where viscous creep occurs. Triaxial deformation experiments were ...
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(2003)We present a model for flow and seepage in a deforming, shear-dilatant sensitive porous layer that enables estimates of the excess pore fluid pressures and flow rates in both the melt and solid phase to be captured ...
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(2003)This is a preliminary report on two sets of recent observations from a region of active tectonics that provide comparatively direct evidence for the critical state of the fluid-saturated microcracked crust. The first data ...
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(PANGAEA, 2012-12-12)
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(2003)The earliest type of wall microstructure of carbonate brachiopod shells is described in genus Obolella Billings, 1861. The microstructure is shown to be similar to that of modern craniids.
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(2003)Shirokshinite, K(NaMg2)Si4O10F2, is the analogue of tainiolite, K(LiMg2)Si4O10F2, with the M1 octahedron fully occupied by Na instead of Li. It was found in the Kirovskii underground apatite mine (Kukisvumchorr Mountain, ...
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(1997)The deep structure, Wadati-Benioff zone (focal zone) geometry and the magma feeding system of Shiveluch volcano are investigated based on 1962–1994 detailed seismic surveillance. A focal zone beneath Shiveluch is dipping ...
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(1994)Quartz single crystals pre-heated to different temperatures (20°, 275°, 540° and 630°C) were experimentally shocked to pressures ranging from 20 to 40 GPa, with the shock front propagating parallel to (10 0) or (0001). ...
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(1997)We have extended the shock-metamorphism classification scheme of Stoffler et al. (1991) to account for shock effects in orthopyroxene and applied it to sixty enstatite chondrites. Orthopyroxene exhibits the following ...
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(2002)The temperatures induced in crystalline calcite (CaCO3) upon planar shock compression (95–160 GPa) are reported from two-stage light gas gun experiments. Temperatures of 3300–5400 K are obtained by fitting six-channel ...
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(1998)Shock vaporization experiments were carried out for 30% porous anhydrite up to 76 GPa. Shocked fully or partially vaporized samples interact with overlying LiF windows whose velocity histories are monitored using a velocity ...
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(1994)A detailed study of Barbotan (H5) and Charsonville (H6), and a partial study of AA Pervomaisky (L6) indicates that shock-induced black veins differ from the host part of chondrites by the following peculiarities: 1.(1) ...
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(2001)Incipient shock-induced devolatilization of Murchison meteorite occurs upon subjecting samples to a minimum shock stress, or pressure, of about 5 GPa. This pressure is similar to that required to initiate devolatilization ...
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(2001)Discovery of abundant anhydrite (CaSO4) and gypsum (CaSO4·2H2O) in the otherwise carbonate sediment comprising the upper 3 km thick layer of the target rock at the K/T impact site has prompted research on these minerals. ...
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(2004)The El'gygytgyn impact structure is about 18 km in diameter and is located in the central part of Chukotka, arctic Russia. The crater was formed in volcanic rock strata of Cretaceous age, which include lava and tuffs of ...
Now showing items 12937-12956 of 39126