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  • 1
    Monograph available for loan
    Monograph available for loan
    Planetary magnetism (2010)
    New York, NY [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: 5/M 18.91371
    In: Space science series of ISSI
    Type of Medium: Monograph available for loan
    Pages: 664 Seiten , Ill., graph. Darst., Kt. , 235 mm x 155 mm
    ISBN: 9781441959003
    Series Statement: Space Sciences Series of ISSI 33
    URL: Inhaltsverzeichnis
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Note: Planetary magnetism : foreword / A. Balogh ... [et al.] -- Space exploration of planetary magnetism / N.F. Ness -- Planetary magnetic field measurements : missions and instrumentation / A. Balogh -- Current systems in planetary magnetospheres and ionospheres / W. Baumjohann ... [et al.] -- Separation of the magnetic field into external and internal parts / N. Olsen, K.-H. Glassmeir, X. Jia -- The magnetic field of planet Earth / G. Hulot ... [et al.] -- Crustal magnetic fields of terrestrial planets / B. Langlais ... [et al.] -- Magnetic fields of the outer planets / C.T. Russell, M.K. Dougherty -- Magnetic fields of the satellites of Jupiter and Saturn / X. Jia ... [et al.] -- The magnetic field of mercury / B.J. Anderson ... [et al.] -- Paleomagnetic records of meteorites and early planetesimal differentiation / B.P. Weiss ... [et al.] -- Induced magnetic fields in solar system bodies / J. Saur, f.M. Neubauer, K.-H. Glassmeier -- The interior structure, composition, and evolution of giant planets / J.J. Fortney, N. Nettelmann -- Thermal evolution and magnetic field generation in terrestrial planets and satellites / D. Breuer, S. Labrosse, T. Spohn -- Theory and modeling of planetary dynamos / J. Wicht, A. Tilgner -- Laboratory dynamo experiments / G. Verhille ... [et al.] -- Dynamo scaling laws and applications to the planets / U.R. Christensen -- The solar dynamo / C.A. Jones, M.J. Thompson, S.M. Tobias -- Dynamo models for planets other than Earth / S. Stanley, G.A. Glatzmaier -- Planetary magnetic fields : achievements and prospects / D.J. Stevenson..
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    Branch Library: GFZ Library
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  • 2
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    Deglacial land emergence and lateral upper-mantle heterogeneity in the Svalbard Archipelago - I. First results for simple load models (1995)
    In:  Geophys. J. Int., Leipzig, 3-4, vol. 121, no. 3, pp. 775-788, pp. L06305, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1995
    Keywords: Rheology ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Inhomogeneity ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    The Fe-snow regime in Ganymede's core: A deep-seated dynamo below a stable snow zone (2015)
    Wiley
    Details
    Publication Date: 2015-05-10
    Description: Ganymede shows signs of a present-day magnetic field, whose origin is thought to be in its core. The Fe-snow regime has been suggested to be vital in Ganymede's history. In this regime, Fe-crystals first form at the core-mantle boundary and later settle to the deeper core due to their higher density (Fe-snow). A stable chemical gradient arises within the liquid of the snow zone. Below the snow zone the Fe-particles remelt. We propose that the remelting of Fe in the deeper, entirely liquid core initiates compositional convection, which could be the origin of the dynamo. Such a dynamo is restricted by the period of time the snow zone needs to grow across the core. We investigate this time period with a 1D core evolution model by varying the initial sulfur concentration, the core heat flux, and the thermal conductivity of the core. For the proposed dynamo in the deeper liquid core, we obtain necessary time periods of between 320–800 Myr and magnetic field strengths at the surface that match the observed value of 719 nT. To explain the present magnetic field we favor cores with high sulfur concentrations because those lead to a late start and a long duration of the dynamo. Furthermore, a present dynamo below the snow zone suggests the absence of an inner core.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
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    Thermo-chemical evolution of Mercury's interior (2013)
    Wiley
    Details
    Publication Date: 2013-10-16
    Description: [1]  A number of observations performed by the MESSENGER spacecraft can now be employed to better understand the evolution of Mercury's interior. Using recent constraints on interior structure, surface composition, volcanic and tectonic history, we modeled the thermal and magmatic evolution of the planet. We ran a large set of Monte Carlo simulations based on one-dimensional parametrized models, spanning a wide range of parameters. We complemented these simulations with selected calculations in 2D-cylindrical and 3D-spherical geometry, which confirmed the validity of the parametrized approach and allowed us to gain additional insight into the spatio-temporal evolution of mantle convection. Core radii of 1940 km, 2040 km, and 2140 km have been considered and, while in the first two cases several models satisfy the observational constraints, no admissible models were found for a radius of 2140 km. A typical thermal evolution scenario consists of an initial phase of mantle heating accompanied by planetary expansion and the production of a substantial amount of partial melt. The evolution subsequent to 2 Gyr is characterized by secular cooling that proceeds approximately at a constant rate and implies that planetary contraction should be ongoing today. Most of the models predict mantle convection to cease after 3 to 4 Gyr, indicating that Mercury may be no longer dynamically active. Finally, assuming the observed surface abundance of radiogenic elements to be representative for the entire crust, we determined bulk silicate concentrations of 35–62 ppb Th, 20–36 ppb U and 290–515 ppm K, similar to those of other terrestrial planets.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
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    Linking rift propagation barriers to excess magmatism at volcanic rifted margins (2014)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2014-11-25
    Description: Break-up–related extrusive magmatism, imaged in reflection seismic data as seaward-dipping reflectors (SDRs), extends symmetrically along the volcanic margins of the Atlantic Ocean. Recent research found distinct along-margin variations in the distribution of SDRs, and abundance of volcanic material was found to be spatially linked to transfer fault systems. These segmented the propagating rift that later developed into the ocean, and are interpreted as rift propagation barriers. Based on these observations, we develop a numerical model, which shows that rift-parallel mantle flow and locally enhanced rates of volcanism are the result of delays in rift propagation and segmented opening. Our model suggests that segmentation is one of the major factors in the distribution and localization of rift-related extrusive magmatism. We conclude that in addition to mantle temperature and inherited crustal structures (e.g., weaknesses from previous rift episodes), rift propagation delay plays an important role in the distribution of extrusive volcanism at volcanic passive margins by controlling the mantle flow beneath the rift axis.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 6
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    The next frontier for planetary and human exploration (2019)
    Springer Nature
    Details
    Publication Date: 2019
    Electronic ISSN: 2397-3366
    Topics: Physics
    Published by Springer Nature
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  • 7
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    Overturn and evolution of a crystallized magma ocean: A numerical parameter study for Mars (2013)
    Wiley
    Details
    Publication Date: 2013-07-12
    Description: [1]  Early in the history of terrestrial planets, the fractional crystallization of a magma ocean can lead to a mantle stratification characterized by a progressive enrichment in heavy elements from the core-mantle boundary to the surface. Such configuration is gravitationally unstable; it causes mantle overturn and the formation of a stable chemical layering. Using simulations of thermo-chemical convection, we analyzed the consequences of overturn and subsequent layering on mantle dynamics assuming Mars' scaling parameters. We found that the time needed to achieve chemical homogenization via convective mixing scales exponentially with the buoyancy-ratio , which measures the relative importance of chemical to thermal buoyancy. In addition, when using a strongly temperature-dependent viscosity, the formation of a stagnant-lid prevents the uppermost crystallized layers from sinking into the mantle. In order to obtain their subduction an yielding mechanism must be invoked. [2]  In the context of Mars' evolution, our results suggest that complete chemical mixing is unlikely to take place within time-scales comparable with the planet's age. Magma ocean freezing could be thus responsible for the long-term preservation of compositional heterogeneities as required by meteoritic evidence. The lack of a surface highly enriched in incompatible elements and of a high-density lid is difficult to reconcile with a stagnant-lid regime operating throughout Mars' history. An episode of surface mobilization induced by compositional overturn can resolve this difficulty provided that is large enough. Too large buoyancy ratios, however, tend to suppress convective heat transport, rendering it problematic to explain the late volcanic history of Mars.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    How large are present-day heat flux variations across the surface of Mars? (2016)
    Wiley
    Details
    Publication Date: 2016-11-22
    Description: The first in-situ Martian heat flux measurement to be carried out by the InSight Discovery-class mission will provide an important baseline to constrain the present-day heat budget of the planet and, in turn, the thermo-chemical evolution of its interior. In this study, we estimate the magnitude of surface heat flux heterogeneities in order to assess how the heat flux at the InSight landing site relates to the average heat flux of Mars. To this end, we model the thermal evolution of Mars in a 3-D spherical geometry and investigate the resulting surface spatial variations of heat flux at the present-day. Our models assume a fixed crust with a variable thickness as inferred from gravity and topography data, and with radiogenic heat sources as obtained from gamma-ray measurements of the surface. We test several mantle parameters and show that the present-day surface heat flux pattern is dominated by the imposed crustal structure. The largest surface heat flux peak-to peak variations lie between 17.2 and 49.9mWm −2 , with the highest values being associated with the occurrence of prominent mantle plumes. However, strong spatial variations introduced by such plumes remain narrowly confined to a few geographical regions and are unlikely to bias the InSight heat flux measurement. We estimated that the average surface heat flux varies between 23.2 and 27.3mWm −2 , while at the InSight location it lies between 18.8 and 24.2mWm −2 . In most models, elastic lithosphere thickness values exceed 250km at the north pole, while the south pole values lie well above 140km.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Present-day Mars' Seismicity Predicted from 3-D Thermal Evolution Models of Interior Dynamics (2018)
    Wiley
    Details
    Publication Date: 2018-03-06
    Description: The InSight mission, to be launched in 2018, will perform a comprehensive geophysical investigation of Mars in-situ. The Seismic Experiment for Interior Structure (SEIS) package aims to detect global and regional seismic events and in turn offer constraints on core size, crustal thickness, and core, mantle and crustal composition. In this study, we estimate the present-day amount and distribution of seismicity using 3D numerical thermal evolution models of Mars, taking into account contributions from convective stresses as well as from stresses associated with cooling and planetary contraction. Defining the seismogenic lithosphere by an isotherm and assuming two end-member cases of 573K and the 1073K, we determine the seismogenic lithosphere thickness. Assuming a seismic efficiency between 0.025 and 1, this thickness is used to estimate the total annual seismic moment budget, and our models show values between 5.7 × 10 16 and 3.9 × 10 19 Nm.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Asymmetric thermal evolution of the Moon (2013)
    Wiley
    Details
    Publication Date: 2013-06-22
    Description: [1]  The Moon possesses a clear dichotomy in geological processes between the nearside and farside hemispheres. The most pronounced expressions of this dichotomy are the strong concentration of radioactive heat sources on the nearside in a region known as the Procellarum KREEP Terrane (PKT), and the mare basaltic lava flows that erupted in or adjacent to this terrane. We model the thermochemical evolution of the Moon using a 3D spherical thermochemical convection code in order to assess the consequences of a layer enriched in heat sources below the PKT on the Moon's global evolution. We find that, in addition to localizing most of the melt production on the nearside, such an enriched concentration of heat sources in the PKT crust has an influence down to the core-mantle boundary and leaves a present day temperature anomaly within the nearside mantle. Moderate gravitational and topographic anomalies that are predicted in the PKT, but not observed, may be masked either by crustal thinning or gravitational anomalies from dense material in the underlying mantle. Our models also predict crystallization of an inner core for sulfur concentrations less than 6 wt.%.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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