Results 71 to 80 of about 27,251 (208)
Zircon Dates Long‐Lived Plume Dynamics in Oceanic Islands
Geochemistry, Geophysics, Geosystems, 2022 In this contribution we report the first systematic study of zircon U‐Pb geochronology and δ18O‐εHf(t) isotope geochemistry from 10 islands of the hot‐spot related Galapagos Archipelago.
Yamirka Rojas‐Agramonte +10 more
doaj +1 more source
The Probability of Mantle Plumes in Global Tomographic Models
Geochemistry, Geophysics, Geosystems, 2020 While the downward mass flux in the Earth's deep interior is well constrained by seismic tomography, the upward flux is still poorly understood and debated.
Augustin Marignier +2 more
doaj +1 more source
Symmetry and plate-like convection in fluids with temperature-dependent viscosity [PDF]
, 2014 We explore the instabilities developed in a fluid in which viscosity depends on temperature. In particular, we consider a dependency that models a very viscous (and thus rather rigid) lithosphere over a convecting mantle.
Curbelo, Jezabel, Mancho, Ana M.
core +1 more source
On the relative motions of long-lived Pacific mantle plumes
Nature Communications, 2018 Using mantle plumes to reconstruct past plate motion is complicated, because plumes may not be fixed. Here, the authors demonstrate using 40Ar/39Ar ages that the Rurutu plume is relatively stable compared to the rapidly moving Hawaiian plume, yet it has ...
Kevin Konrad +5 more
doaj +1 more source
Radial rift and block tectonics around the Tharsis bulge: Introductional postulation [PDF]
Although the Vallis Marineris canyon and radial fossae grabens have been extensively studied, their origin and formation mechanism is still the subject of numerous questions.
Raitala, J.
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Geophysical Research LettersWe present results from thermo‐mechanical numerical modeling of interactions between thermal, thermo‐compositional, and purely compositional (hydrous) mantle plumes, and a rheologically layered lithosphere containing a mid‐lithospheric discontinuity (MLD)
Alessio Lavecchia +3 more
doaj +1 more source
Frontiers in Earth Science, 2018 The Late Permian Emeishan large igneous province (ELIP) is considered to be one of the best examples of a mantle plume derived large igneous province. One of the primary observations that favor a mantle plume regime is the presence of ultramafic volcanic
J. G. Shellnutt, Thuy T. Pham
doaj +1 more source
Morphology and tectonics of the Mid-Atlantic Ridge, 7°–12°S
, 2003 We present swath bathymetric, gravity, and magnetic data from the Mid-Atlantic Ridge between the Ascension and the Bode Verde fracture zones, where significant ridge–hot spot interaction has been inferred.
Bijwaard +56 more
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Will present day glacier retreat increase volcanic activity? Stress induced by recent glacier retreat and its effect on magmatism at the Vatnajokull ice cap, Iceland [PDF]
, 2008 Global warming causes retreat of ice caps and ice sheets. Can melting glaciers trigger increased volcanic activity? Since 1890 the largest ice cap of Iceland, Vatnajokull, with an area of similar to 8000 km(2), has been continuously retreating losing ...
Allen +23 more
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, 1968 Computer program determines the radiant flux to the base region of a real gas system with an axisymmetric geometry and any axisymmetric property ...
De Soto, S., Vok, C. A.
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