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Browsing ELibrary by Title
Now showing items 5440-5459 of 21768
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(2002)The temperature gradient in the lower mantle is fundamental in prescribing many transport properties, such as the viscosity, thermal conductivity and electrical conductivity. The adiabatic temperature gradient is commonly ...
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(2001)Fluids in the earth's crust are commonly transported by hydrofractures, such as dykes and mineral veins, many of which become arrested at various crustal depths. Hydrofractures are commonly arrested - some showing blunt ...
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(2003)Do Archean ages obtained for diamonds from many of the world’s cratons constitute a strong constraint on the thermal state of the Archean continental lithosphere? The apparent longevity of diamonds obtained from cratonic ...
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(2004)In order to investigate imaging properties of various magnetotelluric interpretation parameters over complicated models, we carried out numerical model calculations, where the models contained a 3D near-surface (“shallow”) ...
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(2001)Chironomid-inferred temperature reconstruction has been shown to be accurate but the method is tenuous and time consuming. With the increased importance of high-resolution studies, more samples should be analysed, increasing ...
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(1999)The objective of this paper is to quantitatively assess the role of mantle plumes in transporting heat to the base of the lithosphere. We first review the mechanisms responsible for mantle heat flow. We take the total ...
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(1996)Mineral formation or dissolution is exploited by microbes if it favors their survival. Some microbes are able to dissolve a mineral by using it: (1) as a source of energy, (2) as a terminal electron acceptor in respiration, ...
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(2003)Geological sediments tend to strengthen during progressive burial but the interplay of porosity and permeability, strain and effective stress gives rise to numerous circumstances in which the strength increase can be ...
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(2003)In a series of thermomechanical models of the lithosphere, applied to the determination of apparent elastic thickness, extension, and collision and exhumation, Burov and coworkers model the ductile behaviour of the upper ...
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(2002)The impact-induced release of CO2 is one of the potentially most important mechanisms to explain drastic and rapid changes of the climate at the Cretaceous-Tertiary (K-T) boundary. General predictions, modeling, and ...
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(2005)The Earth's lithosphere can focus basaltic magmatism along pre-existing weakness zones or discontinuities. However, apart from the influence on the geochemistry of magmas emplaced in subduction tectonic settings (mantle ...
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(2002)Laboratory experiments were performed to study the influence of density and viscosity layering on the formation and stability of plumes. Viscosity ratios ranged from 0.1 to 6400 for buoyancy ratios between 0.3 and 20, and ...
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(2001)It is difficult to assign the animal-like body fossils of the late Neoproterozoic to crown metazoan phyla. Many Neoproterozoic fossils appear to share an architectural theme, which was characterized by Seilacher (1984, ...
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(2003)Criteria that are deemed critical for recognition of terrestrial impact craters include features from hand specimens such as shock metamorphic structures. Although these criteria have been selected because they are unique ...
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(2003)Ferrian magnesian spodumene was synthesized in the MLFSH system at P=0.4 GPa, T=700 °C, fO2=NNO+2.3. The space group at room T is P21/c [a=9.638(3) A, b=8.709(2) A, c=5.258(2) A, β=109.83(3)°, V=415.2 A3]. The structure ...
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(2001)During an early phase of the Last Ice Age (Weichselian, Valdaian), about 90 000 yr ago, an ice sheet formed over the shallow Barents and Kara seas. The ice front advanced on to mainland Russia and blocked the north-flowing ...
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(1989)The insoluble materials obtained on dissolution of iron meteorites in 2 M H2SO4 have been analyzed by radiochemical neutron activation to measure the isotopic ratio Hg-196/Hg-202 of Hg released at different temperatures. ...
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(2001)The warm biospheres of the Late Cretaceous and Early Triassic interglacials existed alternately in the humid or arid state. The stages of humid and arid climate differed considerably in their paleogeography and sedimentation ...
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(1998)Hyalotekite, a framework silicate of composition (Ba,Pb,K)(4)(Ca,Y)(2)Si-8(B,Be)(2) (Si,B)(2)O28F, is found in relatively high-temperature(greater than or equal to 500 degrees C) Mn skarns at Langban, Sweden, and peralkaline ...
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(2004)Wave trains in high-frequency seismograms of local earthquakes are mostly composed of incoherent waves that are scattered by distributed heterogeneities within the lithosphere. Their phase variations are very complex; ...
Now showing items 5440-5459 of 21768