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  • 1
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    PANGAEA
    In:  Supplement to: Tarduno, John A; Duncan, Robert A; Scholl, David W; Cottrell, Rory D; Steinberger, Bernhard; Thordarson, Thorvaldur; Kerr, Bryan C; Neal, Clive R; Frey, Frederick A; Torii, Masayuki; Carvallo, Claire (2003): The Emperor Seamounts: Southward motion of the Hawaiian hotspot plume in earth's mantle. Science, 301(5636), 1064-1069, https://doi.org/10.1126/science.1086442
    Publication Date: 2024-01-09
    Description: The Hawaiian-Emperor hotspot track has a prominent bend, which has served as the basis for the theory that the Hawaiian hotspot, fixed in the deep mantle, traced a change in plate motion. However, paleomagnetic and radiometric age data from samples recovered by ocean drilling define an age-progressive paleolatitude history, indicating that the Emperor Seamount trend was principally formed by the rapid motion (over 40 millimeters per year) of the Hawaiian hotspot plume during Late Cretaceous to early-Tertiary times (81 to 47 million years ago). Evidence for motion of the Hawaiian plume affects models of mantle convection and plate tectonics, changing our understanding of terrestrial dynamics.
    Keywords: 19-192; 197-1203A; 197-1204B; 197-1205A; 197-1206A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-40/Argon-36; Argon-40/Argon-36, standard deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Joides Resolution; Leg19; Leg197; North Pacific/GUYOT; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sample comment
    Type: Dataset
    Format: text/tab-separated-values, 222 data points
    Location Call Number Expected Availability
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  • 2
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    Unknown
    GFZ Data Services
    Publication Date: 2023-10-10
    Description: Abstract
    Description: In order to test the feasibility of density and viscosity models suitable to explain geoid and dynamic topography in West Antarctica, we perform computations of a thermal plume that enters at the base of a cartesian box corresponding to a region in the upper mantle, as well as some whole-mantle thermal plume models, as well as some instantaneous disk models, with ASPECT. The plume models have typically a narrow conduit and the plume tends to only become wider as it spreads beneath the lithosphere, typically shallower than ~300 km. These results are most consistent with a shallow disk model with reduced uppermost mantle viscosity, hence providing further support for such low viscosities beneath West Antarctica. The data are a supplement to the following article: Steinberger, B., Grasnick, M.-L. & Ludwig, R., Exploring the Origin of Geoid Low and Topography High in West Antarctica: Insights from Density Anomalies and Mantle Convection Models, Tektonika, https://doi.org/10.55575/tektonika2023.1.2.35
    Keywords: mantle plume ; hotspot ; mantle flow ; mantle processes ; West Antarctica ; EARTH SCIENCE 〉 SOLID EARTH ; EARTH SCIENCE SERVICES 〉 MODELS
    Type: Dataset , Dataset
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  • 3
    Publication Date: 2023-12-09
    Description: Abstract
    Description: We provide 18 3D Earth structures on a global grid. This supplementary material of the manuscript includes (1) 18 netcdf files of the 3D Earth structures and (2) 72 figures that visualize the lithospheric thickness, lateral average viscosity of the asthenosphere, transition zone and upper mantle for all 18 3D Earth structures. The Earth structures were derived from seismic tomography models (Schaeffer & Lebedev 2013, 2010 update of Grand 2002) and, under consideration of geodynamic constrains, transferred to viscosity (Steinberger 2016, Steinberger & Calderwood 2006). The 18 Earth structures vary in conversion from seismic velocity to viscosity. Detailed description of the procedure can be found in the corresponding manuscript (Bagge et al. 2020a), where the Earth structure data were applied to the glacial-isostatic adjustment model VILMA (Klemann et al. 2008, 2015, Martinec et al. 2018) to predict the relative sea-level during the last deglaciation. The netCDF files are provided on a Gaussian grid of 256x512 grid points. Each Earth structure consist of 167 layers, while lateral variations in Earth structure are considered for 114 layers between surface and 870 km depth and radially symmetric layers are considered for 50 layers from 870 km to the Earth’s core. The Earth structure is given as logarithmic viscosity in log10[Viscosity(Pa s)]. To visualize the global 3D structures, we calculated the lithospheric thickness and average viscosity of the asthenosphere, upper mantle and transition zone. The lithospheric thickness is defined as minimum depth with a viscosity 〈 10^23.5 Pa s, the asthenosphere is defined between the base of the lithosphere and 225 km depth, the upper mantle between 225 km and 410 km and the transition zone between 410 km and 670 km depth.
    Keywords: laterally varying Earth structure ; glacial-isostatic adjustment ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOMORPHIC LANDFORMS/PROCESSES 〉 GLACIAL PROCESSES 〉 CRUST REBOUND ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOMORPHIC LANDFORMS/PROCESSES 〉 GLACIAL PROCESSES 〉 GLACIER CRUST SUBSIDENCE
    Type: Dataset , Dataset
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  • 4
    Publication Date: 2023-12-09
    Description: Abstract
    Description: We provide the model results of the manuscript "Glacial-isostatic adjustment models using geodynamically constrained 3D Earth structures" (Bagge et al. 2020, Paper) including the (1) predicted relative sea-level and (2) applied sea-level data. The predicted relative-sea level is calculated with the VIscoelastic Lithosphere and MAntle model VILMA (Klemann et al. 2008, 2015, Martinec et al. 2018, Hagedoorn et al. 2007, Martinec & Hagedoorn 2005, Kendall et al. 2005). The glacial-isostatic adjustment models uses different Earth structures (3D, 1D global mean and 1D regionally adapted; Bagge et al. 2020, Paper; Bagge et al. 2020, https://doi.org/10.5880/GFZ.1.3.2020.004) and ice histories (ICE-5G, Peltier 2004; ICE-6G, Peltier et al. 2015, Argus et al. 2014; NAICE, Gowan et al. 2016) resulting in 44 3D models, 54 1D global mean models and 162 1D regionally adapted models. For more information on model description and input data see Bagge et al. (2020, Paper) and Bagge at al. (2020, https://doi.org/10.5880/GFZ.1.3.2020.004). The provided output data include (1a) the global distribution of predicted relative-sea level at 14 kilo years before present as ensemble range of the 3D GIA models for three ice histories as netCDF files, (1b) the predicted relative-sea level at eight locations at 14 kilo years before present for all models as ASCII file and (1c) the predicted relative sea-level for the deglaciation period for all models as ASCII files. Eight locations include Churchill, Angermanland, Ross Sea (Antarctica), San Jorge Gulf (Patagonia), Central Oregon Coast, Rao-Gandon Area (Senegal), Singapore and Pioneer Bay (Queensland, Australia). (2) The about 520 applied sea-level data provide information on time, relative sea-level and type of sea-level data. They are extracted for the eight locations from the GFZ database using SLIVisu (Unger et al. 2012, 2018) and provided as ACSII files.
    Keywords: laterally varying Earth structure ; glacial-isostatic adjustment ; relative sea-level ; VIscoelastic Lithosphere and MAntle model ; VILMA ; EARTH SCIENCE SERVICES 〉 MODELS 〉 CRYOSPHERE MODELS ; EARTH SCIENCE SERVICES 〉 MODELS 〉 GEOLOGIC/TECTONIC/PALEOCLIMATE MODELS
    Type: Dataset , Dataset
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