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Factors Influencing The Dynamics Of Slab Subduction Based On Temperature-dependent Thermal Coefficients | 18619
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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The thermal conductivity and expansion coefficients are two significant parameters that influence the dynamic process of
slab subduction. Due to the heterogeneity of earth medium, these two coefficients are usually variable with temperature.
Unfortunately, such variations are often ignored in current modeling studies of geodynamics. The present study refers to
the temperature-dependent thermal conductivity and expansion to simulate the dynamics of slab subduction. The impact
of temperature-dependent thermal coefficients and other factors including the Clapeyron slope of phase transitions, olivine
metastability, mantle viscosity and trench retreat on slab geometry and the corresponding characteristics of mantle convection
are analyzed. The modeling results show the temperature-dependent thermal conductivity and expansion influence the
slab angles by changing the thermal and viscosity structure. Slabs tend to be bent at the 410 km phase transition, while the
metastable olivine wedge in a cold slab can increase the positive buoyancy which facilitates the slab stagnation. The positive
Clapeyron slope at the 660 km phase transition, mantle viscosity jump and trench retreat also play a role in deflecting the slab
above the 660 km discontinuity. The mantle convection is affected by slab dynamics and appears different patterns, such as
layered convection and local multiple convection loops etc
Biography
Shuangxi Zhang completed his PhD degree from Hong Kong University in 2003. He is the Deputy Director of the Research Institute of Geodesy and Geophysics,
School of Geodesy and Geomatics, Wuhan University, P.R. China. His major is geophysics, with more than 50 papers in international geophysics journals and
conferences
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