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  • 1
    Online Resource
    Online Resource
    Numerical experiments on 18 O depletion in igneous intrusions cooling by groundwater convection
    American Geophysical Union (AGU) ; 1981
    In:  Journal of Geophysical Research: Solid Earth Vol. 86, No. B8 ( 1981-08-10), p. 7131-7144
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 86, No. B8 ( 1981-08-10), p. 7131-7144
    Abstract: The intrusive and host rocks of epizonal igneous intrusions cooled by groundwater convection are depleted in 18 O by oxygen exchange with low‐ 18 O meteoric waters. This study describes numerical experiments on the hydrothermal convective cooling and 18 O depletion of a family of simple two‐dimensional model intrusions. Cooling and depletion histories are calculated on the basis of conservation laws for mass, thermal energy, and 18 O atoms along with Darcy's law to describe flow in permeable rock and a kinetic description of water‐rock oxygen exchange. Exchange is described on the basis of the measured oxygen diffusivity in feldspar which is large compared to that in other rock‐forming minerals. The resulting equations are solved using finite difference approximations. The numerical experiments examine the effect of intrusion size, intrusive and host rock permeabilities, and host rock thermal environment on the 18 O depletion that develops as an intrusion cools and show that the depletion patterns in a cooled intrusion are sensitive to parameters describing the intrusion and its environment. The dependence of several general characteristics of these patterns on the model parameters is described. Depletions obtained from the sampling of natural intrusions are discussed in the context of this simple family of models.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB086iB08p07131
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1981
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  • 2
    Online Resource
    Online Resource
    Transport phenomena in hydrothermal systems; cooling plutons; the pathline concept in application to the study of transport processes in hydrothermal systems; discussion and reply
    American Journal of Science (AJS) ; 1980
    In:  American Journal of Science Vol. 280, No. 8 ( 1980-10-01), p. 826-830
    Details
    In: American Journal of Science, American Journal of Science (AJS), Vol. 280, No. 8 ( 1980-10-01), p. 826-830
    Type of Medium: Online Resource
    ISSN: 0002-9599
    URL: Article
    DOI: 10.2475/ajs.280.8.826
    RVK:
    TA 1000
    Language: English
    Publisher: American Journal of Science (AJS)
    Publication Date: 1980
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    SSG: 13
    SSG: 25
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  • 3
    Online Resource
    Online Resource
    The tectonics of Ganymede
    Springer Science and Business Media LLC ; 1982
    In:  Nature Vol. 295, No. 5847 ( 1982-1), p. 290-293
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 295, No. 5847 ( 1982-1), p. 290-293
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/295290a0
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1982
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    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Feasibility of a 59Fe ferrokinetic study based on bone-marrow scans
    Springer Science and Business Media LLC ; 1983
    In:  European Journal of Nuclear Medicine Vol. 8, No. 7 ( 1983-7), p. 312-316
    Details
    In: European Journal of Nuclear Medicine, Springer Science and Business Media LLC, Vol. 8, No. 7 ( 1983-7), p. 312-316
    Type of Medium: Online Resource
    ISSN: 0340-6997 , 1619-7089
    URL: Article
    DOI: 10.1007/BF00253758
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1983
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  • 5
    Online Resource
    Online Resource
    Lithospheric stresses due to radiogenic heating of an ice‐silicate planetary body: Implications for Ganymede's tectonic evolution
    American Geophysical Union (AGU) ; 1984
    In:  Journal of Geophysical Research: Solid Earth Vol. 89, No. S02 ( 1984-02-15)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 89, No. S02 ( 1984-02-15)
    Abstract: Thermal evolution models of differentiated and undifferentiated ice‐silicate bodies containing longlived radiogenic heat sources are examined. Lithospheric stresses arise due to volume change of the interior and temperature change in the lithosphere. For an undifferentiated body, the surface stress peaks early in the evolution, while in the differentiated case, stresses peak later and continue to accumulate for longer periods of time. The variation of near‐surface stress with depth shows that stresses for the undifferentiated body initially penetrate to great depths, but rapidly concentrate within a few kilometers of the surface. For the differentiated body, elastic stresses never accumulate at a depth greater than a few kilometers. These models are applied to consider long‐term radioactive heating as a possible mechanism of tectonic activity and bright terrain formation on Ganymede.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB089iS02p0B429
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1984
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  • 6
    Online Resource
    Online Resource
    Magnetic field dependence of microwave radiation in intermediate-length Josephson junctions
    American Physical Society (APS) ; 1984
    In:  Physical Review B Vol. 30, No. 5 ( 1984-9-1), p. 2640-2648
    Details
    In: Physical Review B, American Physical Society (APS), Vol. 30, No. 5 ( 1984-9-1), p. 2640-2648
    Type of Medium: Online Resource
    ISSN: 0163-1829
    URL: Article
    DOI: 10.1103/PhysRevB.30.2640
    RVK:
    UA 6500.3.B
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 1984
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  • 7
    Online Resource
    Online Resource
    A possible mantle instability due to superplastic deformation associated with phase transitions
    American Geophysical Union (AGU) ; 1981
    In:  Geophysical Research Letters Vol. 8, No. 2 ( 1981-02), p. 143-146
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 8, No. 2 ( 1981-02), p. 143-146
    Abstract: Laboratory deformation studies of metals and some oxides indicate that these solids are easily deformed while undergoing a phase transformation. This superplastic effect, if it occurs for mantle silicates, may result in an instability of mantle flow. The instability is illustrated by considering a sheared layer of viscous fluid containing a phase transition. With a simple idealization of the phase transition weakening effect, an oscillatory fluid motion which cycles material through the phase transition is shown to reduce the rate of viscous dissipation associated with shearing the fluid layer. Some possible consequences for mantle flow include the partial decoupling of mantle layers at phase transitions and short wavelength free air gravity anomalies due to induced normal stress variations at the base of the lithosphere.
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/GL008i002p00143
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1981
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Lithospheric stress near a ridge‐transform intersection
    American Geophysical Union (AGU) ; 1984
    In:  Geophysical Research Letters Vol. 11, No. 2 ( 1984-02), p. 113-116
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 11, No. 2 ( 1984-02), p. 113-116
    Abstract: Oceanic lithosphere at a ridge‐transform intersection has distinct structural characteristics. The spreading axis and normal fault scarps, which parallel the ridge axis away from the intersection, locally curve towards the transform fault. This implies that the least compressive stress direction becomes oblique to the spreading direction near a ridge‐transform intersection. This stress field may be the result of a tensile ridge axis stress resisting plate separation and a transform shear stress resisting relative plate motion. A plane stress plate model with prescribed plate boundary stresses is formulated to explore this hypothesis. The orientation of the least compressive horizontal stress near an intersection depends strongly on the ratio of the applied boundary stresses. Thus ridge axis curvature may place an important constraint on plate boundary forces.
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/GL011i002p00113
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1984
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  • 9
    Online Resource
    Online Resource
    Thermal convection in non‐Newtonian fluids: Volumetric heating and boundary layer scaling
    American Geophysical Union (AGU) ; 1982
    In:  Journal of Geophysical Research: Solid Earth Vol. 87, No. B9 ( 1982-09-10), p. 7757-7762
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 87, No. B9 ( 1982-09-10), p. 7757-7762
    Abstract: Thermal convection in a volumetrically heated fluid layer, in which strain rate is proportional to stress with a power law exponent n , is studied by using finite difference approximations. As in earlier studies of convection in a layer heated from below, convection cell structure is found to be relatively independent of n for n ≤ 3. The rate of heat transfer, expressed in terms of an effective Rayleigh number based on a dissipation rate averaged viscosity, is also relatively independent of n . A relationship between effective Rayleigh number and the Rayleigh number based on the viscosity at a reference strain rate is derived on the basis of boundary layer scaling. This relationship agrees with finite difference solutions for both a volumetrically heated layer and a layer heated from below. Applied to planetary interiors, the power law exponent n is shown to influence the time scale of thermal evolution.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB087iB09p07757
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1982
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Current thresholds for zero-field steps in long Josephson junctions
    Springer Science and Business Media LLC ; 1980
    In:  Lettere al Nuovo Cimento Vol. 27, No. 9 ( 1980-3), p. 270-272
    Details
    In: Lettere al Nuovo Cimento, Springer Science and Business Media LLC, Vol. 27, No. 9 ( 1980-3), p. 270-272
    Type of Medium: Online Resource
    ISSN: 1827-613X
    URL: Article
    DOI: 10.1007/BF02817301
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1980
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