I. Multi-Scale Dynamics of Mantle Plumes, and II. Compressible Thermochemical Convection and the Stability of Mantle Superplumes

GeoFramework;mantle convection;plumes;solver coupling;superplumes;thermo-chemical convection

Tan, Eh ; Gurnis, Michael C.

University:California Institute of Technology

Department:Geological and Planetary Sciences

关键词: GeoFramework;    mantle convection;    plumes;    solver coupling;    superplumes;    thermo-chemical convection;   

Others  :  https://thesis.library.caltech.edu/1801/1/0Thesis.pdf

美国|英语

来源: Caltech THESIS

【 摘 要 】

The dynamic interaction of mantle plumes with subducted slabs and plate-scale flow is studied in Part I. We found that plumes preferentially develop on the edge of slabs and that a substantial amount of hot mantle can be trapped beneath slabs over long periods of time, leading to "mega-plume" formation. We used the solver-coupling technique to study the deflection of plume conduits and compare our result with the parameterized approach. The stability of mantle superplumes in compressible thermo-chemical convection is studied in Part II. The depth-dependent chemical density profile, caused by composition-dependent compressibility, is the preferred mechanism to stabilize the superplum