Tidal controls on the lithospheric thickness and topography of Io from magmatic segregation and volcanism modelling
Autor: | Ian Hewitt, Dan C. Spencer, Richard F. Katz |
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Rok vydání: | 2020 |
Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Tidal heating Volcanism 01 natural sciences Mantle (geology) Physics::Geophysics Physics - Geophysics Lithosphere 0103 physical sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) geography geography.geographical_feature_category Vulcanian eruption Astronomy and Astrophysics Geophysics Geodynamics Geophysics (physics.geo-ph) Volcano 13. Climate action Space and Planetary Science Isostasy Astrophysics::Earth and Planetary Astrophysics Geology Astrophysics - Earth and Planetary Astrophysics |
DOI: | 10.48550/arxiv.2008.09022 |
Popis: | Tidal heating is expected to impart significant, non-spherically-symmetric structure to Jupiter's volcanic moon Io. A signature of spatially variable tidal heating is generally sought in observations of surface heat fluxes or volcanic activity, an exploration complicated by the transient nature of volcanic events. The thickness of the lithosphere is expected to change over much longer timescales, and so may provide a robust link between surface observations and the tidal heating distribution. To predict long-wavelength lithospheric thickness variations, we couple three-dimensional tidal heating calculations to a suite of one-dimensional models of magmatic segregation and volcanic eruption. We find that the lithospheric thickness could either be correlated with the radially integrated heating rate, or weakly anti-correlated. Lithospheric thickness is correlated with radially integrated heating rate if magmatic intrusions form at a constant rate in the lithosphere, but is weakly anti-correlated if intrusions form at a rate proportional to the flux through volcanic conduits. Utilising a simple isostasy model we show how variations in lithospheric thickness can predict long-wavelength topography. The relationship between lithospheric thickness and topography depends on the difference in chemical density between the lithosphere and mantle. Assuming that this difference is small, we find that long-wavelength topography anti-correlates with lithospheric thickness. These results will allow future observations to critically evaluate models for Io's lithospheric structure, and enable their use in constraining the distribution of tidal heating. Comment: Published in Icarus |
Databáze: | OpenAIRE |
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