Fabric studies within the Cascade Lake shear zone, Sierra Nevada, California   总被引：1，自引：0，他引：1  

Basil Tikoff  Matthew R. Davis  Christian Teyssier  Michel de St. Blanquat  Guillaume Habert  Sven Morgan   《Tectonophysics》2005,400(1-4):209-226

The Cascade Lake shear zone occurs on the eastern margin of the Tuolumne Intrusive Suite, Sierra Nevada Batholith, California. Foliation in the zone is NNW trending and subvertical, and lineation is moderately south plunging. Deformation is syn-tectonic with emplacement of the Cathedral Peak granodiorite. A deformation gradient exists toward the NE margin of this pluton, with higher strains and lower temperatures of deformation found near the contact. We compare fabric data collected very densely in this shear zone using several techniques: field fabrics, 3D orientation of K-feldspar megacrysts, and AMS (anisotropy of magnetic susceptibility) analysis. In general, the results from the three different methods are in agreement. Deformation in this shear zone is part of a larger pattern of deformation within the Cathedral Peak granodiorite, as recorded by AMS analysis, and dextral shearing associated within the last stage of plutonism within the Sierra Nevada magmatic arc.  相似文献   

Quantum-thermodynamic treatment of intrinsic anharmonicity; Wallace’s theorem revisited   总被引：1，自引：0，他引：1  

Michel H.G. Jacobs  Bernard H.W.S. de Jong 《Physics and Chemistry of Minerals》2005,32(8-9):614-626

Wallace (in Thermodynamics of crystals, 1972) developed a theorem, rooted in rigid lattice dynamics, which incorporates intrinsic anharmonic effects in solids. The practical application of this theorem in mineral physics is computationally involved and this is the main reason for the theorem not getting the attention it deserves. Because intrinsic anharmonicity is an important issue at the extreme conditions in planetary mantles, we derived a method which removes the computational obstacles in applying this theorem. We extended the theorem to incorporate details of the phonon spectrum and tested our algorithm on forsterite (Mg₂SiO₄). Using a least squares inversion technique applied to all available experimental data, we show that it results in an accurate representation of thermodynamic properties and sound wave velocities of Mg₂SiO₄ in its complete pressure–temperature stability range. We also show that the accuracy of our results is not significantly affected by the use of a different equation of state.  相似文献   

February 2005     

Anne Marie de Grosbois 《Environmental Geology》2005,47(3):457-457

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Fowler CMR: The Solid Earth: An Introduction to Global Geophysics     

Anne de Grosbois 《Environmental Geology》2005,48(7):968-968

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Events - July 2005     

Anne Marie de Grosbosis 《Environmental Geology》2005,48(2):280-284

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April 2005     

Anne Marie de Grosbois  Fakhry A. Assaad 《Environmental Geology》2005,47(6):882-882

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Natural manganese oxide: Combined analytical approach for solid characterization and arsenic retention   总被引：2，自引：0，他引：2  

S. Ouvrard  Ph. de Donato  S. Begin  M. Alnot  F. Lhote  M. Sardin 《Geochimica et cosmochimica acta》2005,69(11):2715-2724

To understand the retention of As on a natural manganese sand, the structural, textural and chemical properties of the solid were first investigated by combining scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron-energy-loss spectroscopy (EELS), X-ray diffraction (XRD), BET N₂ gas adsorption, diffuse reflectance Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. Manganese sand could be mainly described as a mixture of a phyllomanganate, lithiophorite [(Al,Li)MnO₂(OH)₂], and pyrolusite (MnO₂). Iron particle, kaolinite and gibbsite type-phases were also observed. Particles organization led to the presence of a mesoporosity with pore diameters ranging from 100 to 200 Å and a specific surface area of 23 m² g⁻¹. Contact with an As(V) solution (0.67 mmol L⁻¹) led to an average fractional surface coverage of 0.4. Both As (V) and (III) were present on the surface of the sand in a 1:1 ratio. As(V) was sorbed on lithiophorite-type particles through surface complexation type reaction. As(III) was thought to result from As(V) reduction mechanism on iron particles.  相似文献   

Anthropogenic particle dispersions in topsoils of the Middle Nile Delta: a preliminary study on the contamination around industrial and commercial areas in Egypt     

Atef M. Abu Khatita  Helga de Wall  Roman Koch 《Environmental Earth Sciences》2016,75(3):264

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A multiphase approach for evaluating the horizontal and rocking impedances of pile group foundations          下载免费PDF全文

V.T. Nguyen  G. Hassen  P. de Buhan 《国际地质力学数值与分析法杂志》2016,40(10):1454-1471

This paper advocates the use of a multiphase model, already developed for static or quasi‐static geotechnical engineering problems, for simulating the behaviour of piled raft foundations subject to horizontal as well as rocking dynamic solicitations. It is shown that such a model, implemented in a FEM code, yields appropriate predictions for the foundation impedance characteristics, provided that shear and bending effects in the piles are taken into account, thus corroborating the findings of the asymptotic homogenization theory. Besides, it is notably pointed out that such a multiphase‐based computational tool makes it possible to assess the dynamic behaviour of pile groups in a much quicker way than when using direct numerical simulations, which may face oversized problems when large pile groups are concerned. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Coupling watersheds,estuaries and regional ocean through numerical modelling for Western Iberia: a novel methodology   总被引：1，自引：1，他引：0  

Francisco Campuzano  David Brito  Manuela Juliano  Rodrigo Fernandes  Hilda de Pablo  Ramiro Neves 《Ocean Dynamics》2016,66(12):1745-1756

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