Mantle flow tectonics: The influence of a ductile lower crust and implications for the formation of topographic uplands on Venus
| Autor: | E. Marc Parmentier, D. L. Bindschadler |
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| Rok vydání: | 1990 |
| Předmět: |
Atmospheric Science
Ecology Mantle wedge Crustal recycling Paleontology Soil Science Forestry Geophysics Aquatic Science Oceanography Mantle (geology) Mantle convection Space and Planetary Science Geochemistry and Petrology Transition zone Hotspot (geology) Earth and Planetary Sciences (miscellaneous) Geology Planetary differentiation Earth-Surface Processes Water Science and Technology Earth's internal heat budget |
| Zdroj: | Journal of Geophysical Research. 95:21329 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jb095ib13p21329 |
| Popis: | The crust and mantle of Venus can be represented by a model of a layered structure stratified in both density and viscosity. This structure consists of a brittle-elastic upper crustal layer; a ductile weaker crustal layer; a strong upper mantle layer, about 10 percent denser than the crust; and a weaker substrate, representing the portion of the mantle in which convective flow occurs which is a primary source of large-scale topographic and tectonic features. This paper examines the interactions between these four layers and the mantle flow driven by thermal or compositional variations. Solutions are found for a flow driven by a buoyancy-force distribution within the mantle and by relief at the surface and crust-mantle boundary. It is shown that changes in crustal thickness are driven by vertical normal stresses due to mantle flow and by shear coupling of horizontal mantle flow into the crust. |
| Databáze: | OpenAIRE |
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