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| Mantle convection | |
|---|---|
| Name | Mantle convection |
| Field | Geophysics |
| Notable for | Heat transport within Earth's mantle |
Mantle convection is the process by which thermal and compositional buoyancy drives slow, creeping flow within Earth's mantle, redistributing heat and material between the core, mantle, lithosphere, and crust. It underpins long-term planetary cooling, surface deformation, and magmatism, linking deep-Earth processes to phenomena observed at mid-ocean ridges, subduction zones, and intraplate hotspots. Studies of convection integrate knowledge from seismology, mineral physics, geochemistry, and planetary science, and involve collaboration among institutions such as United States Geological Survey, British Geological Survey, and research groups at universities like Massachusetts Institute of Technology and California Institute of Technology.
Mantle convection arises from internal heating and basal heat flux produced by radiogenic isotopes such as Uranium-238, Thorium-232, and Potassium-40, as well as secular cooling following planetary accretion and events like the Late Heavy Bombardment. Heat transport in the mantle competes between conductive processes near the Mohorovičić discontinuity and convective overturn on scales ranging from whole-mantle circulation to small-scale lithospheric instabilities beneath cratons such as the Canadian Shield and Pilbara Craton. Numerical and laboratory investigations draw on analog experiments performed in facilities associated with Scripps Institution of Oceanography and theories developed by scientists linked to University of Cambridge and ETH Zurich.
Buoyancy forces in the mantle result from thermal expansion and compositional heterogeneity introduced by subducted lithosphere from convergent margins like the Aleutian Islands or the Marianas Trench, and by chemical differentiation during core formation tied to events such as the Giant Impact Hypothesis for lunar origin. Viscous flow obeys forms of the Stokes and Navier–Stokes equations adapted for high-pressure silicate rheology constrained by experiments at laboratories like Argonne National Laboratory and Lawrence Livermore National Laboratory. Phase transitions at depths corresponding to the Gutenberg discontinuity, 410 km discontinuity, and 660 km discontinuity produce density and viscosity contrasts that influence upwelling and downwelling; these transitions connect to mineralogical changes involving olivine, wadsleyite, and ringwoodite studied at Carnegie Institution for Science and Geophysical Laboratory. Thermal boundary layers under the Pacific Plate and African Plate control plume generation zones examined in studies from the Monterey Bay Aquarium Research Institute.
Simulation frameworks developed at centers including Jet Propulsion Laboratory, Princeton University, and Columbia University implement finite-element and finite-volume solvers for compressible convection with realistic equations of state such as those calibrated against data from Diamond Anvil Cell experiments and shock compression facilities at Los Alamos National Laboratory. Models incorporate mantle viscosity profiles derived from post-glacial rebound studies in regions like Fennoscandia and rheological laws informed by dislocation creep, diffusion creep, and grain-boundary sliding observed in experiments at University of Minnesota. Global tomography models from groups at Harvard University and ETH Zurich are used to initialize convection simulations that couple mantle flow to surface plates using kinematic datasets from NOAA and plate reconstructions provided by researchers at University of Sydney and University of Oxford.
Seismic tomography from networks such as Incorporated Research Institutions for Seismology and arrays installed by the Japan Agency for Marine-Earth Science and Technology images mantle heterogeneity, revealing high-velocity slabs beneath the Tonga Trench and low-velocity anomalies beneath the Iceland and Hawaii regions. Geochemical signatures in basalts sampled at mid-ocean ridges like the Mid-Atlantic Ridge and large igneous provinces such as the Deccan Traps carry isotopic fingerprints (e.g., helium and lead isotopes) measured at institutions including Woods Hole Oceanographic Institution that indicate deep or recycled sources. Heat-flow surveys coordinated by International Heat Flow Commission and gravity studies by European Space Agency missions provide constraints on lithospheric thermal structure and dynamic topography observed across continents like Africa and Australia.
Convection couples to lithospheric plates through mechanisms such as slab pull at subduction zones exemplified by the Peru–Chile Trench and ridge push at spreading centers like the East Pacific Rise. The interaction between mantle flow and plates explains features from continental rifting in the East African Rift to orogeny in the Himalayas linked to the collision of Indian Plate and Eurasian Plate. Mantle-driven mantle flow hypotheses inform interpretations of intraplate volcanism in provinces including the Siberian Traps and the Columbia River Basalts, with geodynamic scenarios tested against plate kinematic models from paleomagnetic studies at institutions like University of California, Berkeley.
Long-term mantle evolution encompasses cooling histories constrained by studies of Earth's thermal budget from researchers at National Aeronautics and Space Administration and comparisons with planetary convection on bodies like Mars, Venus, and the Moon. Mantle plume hypotheses, invoked for hotspots such as Hawaii and Iceland, posit upwelling thermal diapirs originating near the core–mantle boundary beneath structures like the Large Low Shear Velocity Provinces linked to African LLSVP and Pacific LLSVP. Plume-pulse models intersect with mass extinction events associated with Siberian Traps and Deccan Traps and are investigated via geochronology labs at Smithsonian Institution and Max Planck Institute for Chemistry.
Mantle rheology depends on mineral assemblages dominated by peridotite and eclogite compositions; high-pressure phases such as bridgmanite and post-perovskite affect viscosity and seismic anisotropy studied by experimentalists at University of Chicago and Yale University. Water and volatiles from subducted slabs influence grain-boundary processes and melt production, with petrological constraints from fieldwork in regions like the Western Gneiss Region and analytical facilities at Geological Survey of Japan. Grain size, temperature, pressure, and compositional layering produce complex non-Newtonian behavior implemented in geodynamic codes developed at Potsdam Institute for Climate Impact Research and benchmarked against laboratory analogs from University of Leeds.