Seismic observations have revealed two large low shear velocity provinces (LLSVPs) in the lowermost mantle beneath Pacific and Africa. One hypothesis for the origin of LLSVPs is that they are caused by accumulation of subducted oceanic crust on the core-mantle boundary (CMB). Here, I perform high resolution geodynamical calculations to test this hypothesis. The result shows that it is difficult for a thin (~ 6 km) subducted oceanic crust to accumulate on the CMB, and the major part of it is viscously stirred into the surrounding mantle.
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- lowermost mantle
- more-primitive material
- Numerical Modeling
- subducted oceanic crust
- Mantle plumes--Mathematical models.
- Mantle plumes
- Partial requirement for: Ph.D., Arizona State University, 2015Note typethesis
- Includes bibliographical referencesNote typebibliography
- Field of study: Geological sciences