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  • 1
    Online Resource
    Online Resource
    Cambridge :Cambridge University Press,
    Keywords: Geochronometry. ; Electronic books.
    Description / Table of Contents: This 2006 book presents a range of numerical modeling techniques to allow the physical implications of isotopic age data to be explored. Various solutions to the heat transfer equation are illustrated by case studies across diverse tectonic settings and boundary conditions. Additional materials, including short tutorials, are available on an accompanying website at www.cambridge.org/9781107407152.
    Type of Medium: Online Resource
    Pages: 1 online resource (272 pages)
    Edition: 1st ed.
    ISBN: 9780511160417
    DDC: 551.701
    Language: English
    Note: Cover -- Half-title -- Title -- Copyright -- Contents -- Preface -- 1 Introduction -- 1.1 Thermal history: the accumulation of thermochronological age -- 1.2 Cooling, denudation and uplift paths -- 1.3 Thermochronology in practice -- Choice of thermochronometer -- Sampling scale -- Structural complexity -- Mineralogy -- Sample preparation -- Sample quality -- 2 Basics of thermochronology: from t-T paths to ages -- 2.1 The isotopic age equation -- 2.2 Solid-state diffusion - the basic equation -- 2.3 Absolute closure-temperature approximation -- 2.4 Dodson's method -- 2.5 Numerical solution -- The spherical approximation -- The finite-difference formulation -- 2.6 Determining the diffusion parameters -- Tutorial 1 -- 3 Thermochronological systems -- 3.1 Ar dating methods -- Diffusion behaviour of Ar -- Modelling routines -- 3.2 (U-Th)/He thermochronology -- Diffusion behaviour of He -- Mad_He.f90 -- 3.3 Fission-track thermochronology -- Annealing of fission tracks and confined track-length distributions -- Annealing models -- MadTrax.f -- Tutorial 2 -- 4 The general heat-transport equation -- 4.1 Heat transport within the Earth -- 4.2 Conservation of energy -- 4.3 Conduction -- 4.4 Advection -- 4.5 Production -- 4.6 The general heat-transport equation -- 4.7 Boundary conditions -- 4.8 Purely conductive heat transport -- Conductive equilibrium - variable conductivity -- Conductive equilibrium - the effect of heat production -- Tutorial 3 -- 5 Thermal effects of exhumation -- 5.1 Steady-state solution -- Uplift and exhumation -- Basic PDE: the steady-state case -- The dimensionless form -- Solution -- 5.2 Thermal effects of exhumation: transient solution -- Basic PDE: the transient case -- Solution -- 5.3 Thermal effects of exhumation: the general transient problem -- Finite-element equations -- The weak form -- The weighted residual. , The Galerkin method -- Finite-element discretisation -- Shape functions -- Linear shape functions -- Local coordinates -- Quadratic shape functions -- Two-dimensional elements -- Shape-function derivatives -- Which elements to use? -- Numerical integration -- The Newton-Cotes formula -- Gauss quadrature -- Which integration scheme? -- Time-stepping algorithms -- An explicit-implicit scheme -- Limits on time-step length -- Assembling the matrices -- The complete matrix -- Banded matrices and node numbering -- Solution of the finite-element equations -- Fixed-temperature boundary conditions -- Positive-definite, symmetrical -- Non-symmetrical A -- Iterative methods -- Heat1D -- Comparison with analytical solutions -- Tutorial 4 -- Tutorial 5 -- Tutorial 6 -- 6 Steady-state two-dimensional heat transport -- 6.1 The effect of surface topography -- Conductive equilibrium -- Effects of exhumation -- Another approximate solution -- 6.2 The age-elevation relationship - steady state -- 6.3 Relief change -- Conclusion -- Tutorial 7 -- 7 General transient solution - the three-dimensional problem -- 7.1 Pecube -- 7.2 Time-varying surface topography -- 7.3 Surface relief in the Sierra Nevada -- Tutorial 8 -- 8 Inverse methods -- 8.1 Spectral analysis -- 8.2 An example based on synthetic ages -- 8.3 Application of the spectral method to the Sierra Nevada -- 8.4 Sampling strategy -- 8.5 Systematic searches -- 9 Detrital thermochronology -- 9.1 The basic approach -- 9.2 Deconvolution of detrital age distributions -- 9.3 Estimating denudation rates from detrital ages -- 9.4 Estimating relief from detrital ages -- 9.5 Interpreting partially reset detrital samples -- 10 Lateral advection of material -- 10.1 Lateral variability in tectonically active regions -- 10.2 Exhumation and denudation in multi-dimensional space. , 10.3 Consequences of lateral motion for thermochronology -- Integrated effects on individual ages -- Consequences for spatially dispersed datasets -- 10.4 Scaling of lateral significance with closure temperature -- 10.5 Evaluation of the significance of lateral variation -- Regional estimation of significance: the Eta factor -- Deconvolving lateral effects on the thermochronological record -- Case study: the Olympic Mountains -- Tutorial 9 -- Tutorial 10 -- 11 Isostatic response to denudation -- 11.1 Local isostasy -- 11.2 Flexural isostasy -- 11.3 Periodic loading -- 11.4 Isostatic response to relief reduction -- 11.5 Effects on age distribution -- 11.6 Effects on age-elevation distributions -- 11.7 Application to the Dabie Shan -- 12 The evolution of passive-margin escarpments -- 12.1 Introduction -- 12.2 Early conceptual models: erosion cycles -- 12.3 Thermochronological data from passive margins -- 12.4 Models of landscape development at passive margins -- 12.5 Combining thermochronometers and modelling -- 13 Thermochronology in active tectonic settings -- 13.1 A simple model for continental collision -- 13.2 Heat advection in mountain belts -- 13.3 The Alpine Fault, South Island, New Zealand -- 13.4 Application of the Neighbourhood Algorithm to Southern Alps data -- Appendix 1 Forward models of fission-track annealing -- A1.1 Variable temperature history -- Appendix 2 Fortran routines provided with this textbook -- Appendix 3 One-dimensional conductive equilibrium with heat production -- A3.1 The problem -- A3.2 The basic equation -- A3.3 The dimensionless form -- A3.4 Analytical solution -- A3.5 Temperature at the base of the crust -- A3.6 The relationship between heat flux and heat production -- Appendix 4 One-dimensional conductive equilibrium with anomalous conductivity -- A4.1 The problem -- A4.2 The basic equation. , A4.3 The dimensionless form -- A4.4 Analytical solution -- A4.5 Temperature at the base of the crust -- Appendix 5 One-dimensional transient conductive heat transport -- A5.1 The problem -- A5.2 The basic equation -- A5.3 The dimensionless form -- A5.4 Analytical solution -- Appendix 6 Volume integrals in spherical coordinates -- A6.1 Spherical integrals -- Appendix 7 The complementary error function -- Appendix 8 Pecube user guide -- A8.1 How to compile and execute Pecube -- A8.2 The input file -- A8.3 create_Pecube_in -- A8.4 Peclet_ geom -- A8.5 Output files -- Appendix 9 Tutorial solutions -- A9.1 Tutorial 1 -- A9.2 Tutorial 2 -- A9.3 Tutorial 3 -- A9.4 Tutorial 4 -- A9.5 Tutorial 5 -- A9.6 Tutorial 6 -- A9.7 Tutorial 7 -- A9.8 Tutorial 8 -- A9.9 Tutorial 9 -- A9.10 Tutorial 10 -- References -- Index.
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  • 2
    Publication Date: 2023-12-16
    Description: We present a study to estimate the large‐scale landscape history of a continental margin, by establishing a source‐to‐sink volume balance between the eroding onshore areas and the offshore basins. Assuming erosion as the primary process for sediment production, we strive to constrain a numerical model of landscape evolution that balances the volumes of eroded materials from the continent and that deposited in the corresponding basins, with a ratio imposed for loss of erosion products. We use this approach to investigate the landscape history of Madagascar since the Late Cretaceous. The uplift history prescribed in the model is inferred from elevations of planation surfaces formed at various ages. By fitting the volumes of terrigenous sediments in the Morondava Basin along the west coast and the current elevation of the island, the landscape evolution model is optimized by constraining the erosion law parameters and ratios of sediment loss. The results include a best‐fit landscape evolution model, which features two major periods of uplift and erosion during the Late Cretaceous and the middle to late Cenozoic. The model supports suggestions from previous studies that most of the high topography of the island was constructed since the middle to late Miocene, and on the central plateau the erosion has not reached an equilibrium with the high uplift rates in the late Cenozoic. Our models also indicate that over the geological time scale a significant portion of materials eroded from Madagascar was not archived in the offshore basin, possibly consumed by chemical weathering, the intensity of which might have varied with climate.
    Description: This paper uses a numerical landscape evolution model to reconstruct the topographic history of Madagascar since the Late Cretaceous. The model is optimised by balancing the volumes of onshore erosion and offshore sedimentation; the former is predicted with erosion laws and based on uplift history inferred from elevated planation surfaces. The modelling results suggest a significant volume loss of materials during the process from erosion to sedimentation, which is likely consumed by chemical weathering. image
    Description: https://tel.archives-ouvertes.fr/tel-01865476
    Keywords: ddc:551.3 ; chemical weathering ; erosion ; landscape evolution model ; Madagascar ; sedimentary basin ; source to sink
    Language: English
    Type: doc-type:article
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  • 3
    Publication Date: 2024-03-12
    Description: Passive margin stratigraphy contains time‐integrated records of landscapes that have long since vanished. Quantitatively reading the stratigraphic record using coupled landscape evolution and stratigraphic forward models (SFMs) is a promising approach to extracting information about landscape history. However, there is no consensus about the optimal form of simple SFMs because there has been a lack of direct tests against observed stratigraphy in well‐constrained test cases. Specifically, the extent to which SFM behaviour over geologic space and timescales should be governed by local (downslope sediment flux depends only on local slope) versus nonlocal (sediment flux depends on factors other than local slope, such as the history of slopes experienced along a transport pathway) processes is currently unclear. Here, we develop a nonlocal, nonlinear SFM that incorporates slope bypass and long‐distance sediment transport, both of which have been previously identified as important model components but not thoroughly tested. Our model collapses to the local, linear model under certain parameterizations such that best‐fit parameter values can indicate optimal model structure. Comparing 2‐D implementations of both models against seven detailed seismic sections from the Southeast Atlantic Margin, we invert the stratigraphic data for best‐fit model parameter values and demonstrate that best‐fit parameterizations are not compatible with the local, linear diffusion model. Fitting observed stratigraphy requires parameter values consistent with important contributions from slope bypass and long‐distance transport processes. The nonlocal, nonlinear model yields improved fits to the data regardless of whether the model is compared against only the modern bathymetric surface or the full set of seismic reflectors identified in the data. Results suggest that processes of sediment bypass and long‐distance transport are required to model realistic passive margin stratigraphy and are therefore important to consider when inverting the stratigraphic record to infer past perturbations to source regions.
    Description: European Commission http://dx.doi.org/10.13039/501100000780
    Description: United States National Science Foundation http://dx.doi.org/10.13039/501100008982
    Description: H2020 Marie Sklodowska‐Curie
    Description: https://doi.org/10.6084/m9.figshare.20205077
    Keywords: ddc:551.3 ; Southeast Atlantic Margin ; stratigraphy ; sediment transport ; numerical modeling
    Language: English
    Type: doc-type:article
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Science Ltd
    Terra nova 13 (2001), S. 0 
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This contribution presents the results of a numerical study of karst denudation on limestone plateaux. The landscape evolution model used incorporates not only long-range fluvial and short-range hill-slope processes, but also large-scale chemical dissolution of limestone surfaces. The relative efficiencies of fluvial and chemical processes are of equal importance to the landscape evolution of a plateau dropping to sea level along an escarpment. While fluvial processes have an impact confined mostly to river channels, the karst denudation process is more uniform, removing material also from the plateau surface. The combined effect of both processes results in a landscape evolution almost twice as effective as the purely erosional evolution of an insoluble landscape.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Science Ltd
    Terra nova 14 (2002), S. 0 
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Extracting independent information on mean exhumation rate and the rate of surface relief change from thermochronometric datasets is essential to improve our understanding of the complex coupling between tectonics and surface erosion, i.e. the time-scale over which landforms react to changes in uplift rate and/or climate. A new method, based on spectral analysis of age–elevation data collected along one-dimensional profiles, is presented that provides independent estimates of the mean exhumation rate and the relative change in surface relief. The results are shown to be independent of the assumed geothermal gradient. The method is applied to an existing age dataset from the Sierra Nevada, California, and provides constraints on the evolution of the present-day relief. The spectral analysis demonstrates how current sampling strategies should be modified to optimize the tectonic and geomorphic information that can be retrieved from a thermochronometric dataset.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 122 (1995), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: An approach is presented for interpolating a property of the Earth (for example temperature or seismic velocity) specified at a series of ‘reference’ points with arbitrary distribution in two or three dimensions. The method makes use of some powerful algorithms from the field of computational geometry to efficiently partition the medium into ‘Delaunay’ triangles (in 2-D) or tetrahedra (in 3-D) constructed around the irregularly spaced reference points. The field can then be smoothly interpolated anywhere in the medium using a method known as natural-neighbour interpolation. This method has the following useful properties: (1) the original function values are recovered exactly at the reference points; (2) the interpolation is entirely local (every point is only influenced by its natural-neighbour nodes); and (3) the derivatives of the interpolated function are continuous everywhere except at the reference points. In addition, the ability to handle highly irregular distributions of nodes means that large variations in the scale-lengths of the interpolated function can be represented easily. These properties make the procedure ideally suited for ‘gridding’ of irregularly spaced geophysical data, or as the basis of parametrization in inverse problems such as seismic tomography.We have extended the theory to produce expressions for the derivatives of the interpolated function. These may be calculated efficiently by modifying an existing algorithm which calculates the interpolated function using only local information. Full details of the theory and numerical algorithms are given. The new theory for function and derivative interpolation has applications to a range of geophysical interpolation and parametrization problems. In addition, it shows much promise when used as the basis of a finite-element procedure for numerical solution of partial differential equations.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 655-660 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An efficient numerical method is described for solving partial differential equations in problems where traditional eulerian and lagrangian techniques fail. The approach makes use of the geometrical concept of 'natural neighbours', the properties of which make it suitable for solving problems ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 440.2006, 7082, E4-, (2 S.) 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Bjørnerud and Austrheim interpret the geological evidence in the rocks of Holsnøy at Lindås nappe, Norway, to be inconsistent with our cold-crust model, but do not question our new argon isotopic data, on which we base the thermal history of the terrain. A critical ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 1191-1196 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Collision tectonics and the associated transformation of continental crust to high-pressure rocks (eclogites) are generally well-understood processes, but important contradictions remain between tectonothermal models and petrological–isotopic data obtained from such rocks. Here we use ...
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0738
    Keywords: Methoxyethylmercury ; Nephrotoxicity ; Enzymuria ; Gamma glutamyl transferase ; Alkaline phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The fungicide, methoxyethylmercury chloride, was given in a saline solution to four groups of Sprague-Dawley C D rats (5 ♂, 5 ♀) as a single injection (IP) of 0, 0.5, 1.0, and 2.0 mg Hg/kg. In a three-day period, no changes were observed in urine collected every 24 h from rats given 0 or 0.5 mg Hg/kg; 1 mg Hg/kg induced only a transient increase of urine gamma glutamyl transferase (x 4) and alkaline phosphatase (x 2.5) on the day 2; 2.0 mg Hg/kg caused an early increase of enzymuria (day 1 and day 2) and a decrease of Na+, Cl−, K+, urea, and creatinin excretion. Urine enzymes and total mercury excretion were higher in males. These time-related variations of enzymuria, compared to previous results with Hg Cl2, could reflect the existence of metabolites more toxic than the native compound.
    Type of Medium: Electronic Resource
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