Results 21 to 30 of about 196,173 (215)
Lithospheric mantle buoyancy: the role of tectonic convergence and mantle composition [PDF]
Scientific Reports, 2019 AbstractPlate subduction and delamination, two key processes driving plate tectonics, are thought to be controlled by the buoyancy of the lithospheric mantle relative to the underlying asthenosphere. Most mantle delamination models consider a lithospheric density higher than the asthenosphere to ensure negative buoyancy (slab pull).
K. Boonma +4 more
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Ductile Deformation of the Lithospheric Mantle
Annual Review of Earth and Planetary Sciences, 2023 The strength of lithospheric plates is a central component of plate tectonics, governed by brittle processes in the shallow portion of the plate and ductile behavior in the deeper portion. We review experimental constraints on ductile deformation of olivine, the main mineral in the upper mantle and thus the lithosphere.
Jessica M. Warren, Lars N. Hansen
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How mantle heterogeneities drive continental subduction and magmatism in the Apennines
Scientific Reports, 2022 Petrologic and geophysical observations floored the paradigm shift on the subduction of the continental lithosphere. In long-lived collisional boundaries like the Alpine Himalaya belt, portions of continental lithosphere are pushed down to great depths ...
G. Giacomuzzi, P. De Gori, C. Chiarabba
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Solid Earth Sciences, 2020 Formation of the first continents belongs to fundamental questions regarding the evolution of the Earth. Though the growth of early crust is often debated, role of the mantle lithosphere that represents the biggest volume of continents is often ...
Vladislav Babuška, Jaroslava Plomerová
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Impact of upper mantle convection on lithosphere hyperextension and subsequent horizontally forced subduction initiation [PDF]
Solid Earth, 2020 Many plate tectonic processes, such as subduction initiation, are embedded in long-term (>100 Myr) geodynamic cycles often involving subsequent phases of extension, cooling without plate deformation and convergence. However, the impact of upper mantle
L. G. Candioti +3 more
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Heterogeneity and anisotropy in the lithospheric mantle [PDF]
Tectonophysics, 2015 The lithospheric mantle is intrinsically heterogeneous and anisotropic. These two properties govern the repartition of deformation, controlling intraplate strain localization and development of new plate boundaries. Geophysical and geological observations provide clues on the types, ranges, and characteristic length scales of heterogeneity and ...
Andréa Tommasi, Alain Vauchez
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Southern Africa crustal anisotropy reveals coupled crust-mantle evolution for over 2 billion years
Nature Communications, 2019 The long-term stability of Precambrian continental lithosphere depends on the rheology of the lithospheric mantle as well as the coupling between crust and mantle lithosphere.
H. Thybo, M. Youssof, I. M. Artemieva
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The Relationship Between Kimberlitic Magmatism and Electrical Conductivity Anomalies in the Mantle
Geophysical Research Letters, 2022 Kimberlites are igneous rocks whose formation remains enigmatic due to their severely altered nature, highly variable compositions and rapid ascent through the lithosphere.
Sinan Özaydın, Kate Selway
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Geochemistry, Geophysics, Geosystems, 2020 The timing and mechanism of formation of the Tibet Plateau remain elusive, and even the present‐day structure of the Tibetan lithosphere is hardly resolved, due to conflicting interpretations of the geophysical data.
Fanny Goussin +10 more
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Lithospheric Thinning by Mantle Plumes [PDF]
ASEG Extended Abstracts, 2016 Thermo-mechanical thinning of the lithosphere by mantle plumes is essential for intra-plate volcanism, the initiation of rifting, the evolution of Earth’s lower continental crust and the genesis of metals, diamonds and hydrocarbons. To develop a new understanding of how a mantle plume thins the overlying lithosphere beneath moving plates, we use 2-D ...
Manon Dalaison, Rhodri Davies
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