Effects of compositional and rheological stratifications on small-scale convection under the oceans: Implications for the thickness of oceanic lithosphere and seafloor flattening

Details Effects of compositional and rheological stratifications on small-scale convection under the oceans: Implications for the thickness of oceanic lithosphere and seafloor flattening Effects of compositional and rheological stratifications on small-scale convection under the oceans: Implications for the thickness of oceanic lithosphere and seafloor flattening

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520308a&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 20, CiteID L20308

Physics

3

Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Rheology: Mantle (8033), Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Mineral Physics: Creep And Deformation, Geochemistry: Mid-Oceanic Ridge Processes (3614, 8416)

Scientific paper

Pressure-release melting at mid-ocean ridges generate compositional and rheological layering in the oceanic mantle that may control the evolution of the oceanic lithosphere. We use dynamic models coupled with melting and petrological models to explore 1) the influence of this layering on the development of small-scale convection under the oceans, 2) its role in determining the thickness of oceanic lithosphere, and 3) its feasibility as responsible for the deviations of seafloor and surface heat flow from predictions by conductive models in mature oceanic lithosphere. Here we show that the existence of small-scale convection is entirely compatible with experimental creep parameters and flow laws, and that the viscosity stratification due to melt extraction (i.e., H2O removal) is the main factor controlling the plate's thermal evolution, its asymptotic thickness, and the flattening of seafloor and surface heat flow at ages $\gtrsim$70 Ma. The effects of Al-rich phase transitions and compositional layering are minor.

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