Characterization of secondary mantle convection from geophysical data and models

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Show simple item record Pandit, Bimal 2020-05-08T21:09:06Z 2020-05-08T21:09:06Z 2020-05-01
dc.description.abstract Small-scale convection or secondary convection has been studied using the geophysical data and models such as seismic tomography models and geoid anomalies. We used three seismic tomography models, SEMUCB-WM1, SAVANI and S40RTS to infer the lithosphere/asthenosphere boundary, and the destabilization of the lithosphere, induced by secondary mantle convection. Former studies, based on numerical and experimental models report that secondary convection would occur as sub-lithospheric longitudinal rolls, induced by the shear associated with the lithospheric plate motion, or as helices, formed when sinking cold plumes, falling from the base of the lithosphere are sheared away by the large-scale flow. Our study shows that the secondary convection under the Pacific plate occurs in the form of 3D plumes and helices. The lithospheric drips observed in the tomography models first appear as small wavelength anomalies beneath a 30-40 M.y. old and 75-90 km thick lithosphere. They are observed as longer elongated patterns beneath 105 M.y. old and 138 km thick lithosphere. Most of the lithospheric anomalies are associated with negative geoid anomalies of order and degrees 8-40. No clear correlation between lithospheric destabilization and volcanism is observed. en_US
dc.language.iso en_US en_US
dc.subject Secondary Mantle Convection en_US
dc.subject Lithosphere en_US
dc.subject Asthenosphere en_US
dc.subject Destabilization en_US
dc.subject Seismic Tomography en_US
dc.subject Geoid en_US
dc.title Characterization of secondary mantle convection from geophysical data and models en_US
dc.type Thesis en_US Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Geology en_US
dc.description.advisor Claudia Adam en_US 2020 en_US May en_US

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