Results 11 to 20 of about 2,719 (188)

The subantarctic lithospheric mantle [PDF]

Geological Society, London, Memoirs, 2021
Abstract We present a summary of peridotite in the Subantarctic (46–60° S) surrounding the Antarctic Plate. Peridotite xenoliths occur on the Kerguelen Islands and Auckland Islands. The Kerguelen Islands are underlain by a plume, whereas the Auckland Islands are part of continental Zealandia, which is a Gondwana-rifted fragment. Small amounts
Guillaume Delpech, James M. Scott, Michel Grégoire, Bertrand N. Moine, Dongxu Li, Jingao Liu, D. Graham Pearson, Quinten H. A. van der Meer, Tod E. Waight, Gilbert Michon, Damien Guillaume, Suzanne Y. O'Reilly, Jean-Yves Cottin, André Giret   +13 more
openaire   +5 more sources

Joint modeling of lithosphere and mantle dynamics elucidating lithosphere‐mantle coupling [PDF]

Geophysical Research Letters, 2008
We provide new insights into the lithosphere‐mantle coupling problem through a joint modeling of lithosphere dynamics and mantle convection and through comparison of model results with the high resolution velocity gradient tensor model along the Earth's plate boundary zones.
A. Ghosh, W. E. Holt, L. Wen, A. J. Haines, L. M. Flesch   +4 more
openaire   +1 more source

Heavy oxygen recycled into the lithospheric mantle [PDF]

Scientific Reports, 2019
AbstractMagmas in volcanic arcs have geochemical and isotopic signatures that can be related to mantle metasomatism due to fluids and melts released by the down-going oceanic crust and overlying sediments, which modify the chemistry and mineralogy of the mantle wedge.
Dallai L.[1], Bianchini G.[2], Avanzinelli R.[3, 4], Natali C.[2, 3], Conticelli S. [3, 4, 5]   +8 more
openaire   +3 more sources

Lithological structure of western Pacific lithosphere reconstructed from mantle xenoliths in a petit-spot volcano

Progress in Earth and Planetary Science, 2022
The lithospheric mantle, formed at the mid-ocean ridge as a residue of crustal production, comprises theoretically depleted peridotite, but more fertile components (e.g., lherzolite and pyroxenite) have been reported, creating an enigmatic picture of the
Kazuto Mikuni, Naoto Hirano, Norikatsu Akizawa, Junji Yamamoto, Shiki Machida, Akihiro Tamura, Yuuki Hagiwara, Tomoaki Morishita   +7 more
doaj   +1 more source

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, A. Kumar, D. Garcia-Castellanos, I. Jiménez-Munt, M. Fernández   +4 more
openaire   +3 more sources

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
openaire   +1 more source

Growth of primordial continents by cycles of oceanic lithosphere subductions: Evidence from tilted seismic anisotropy supported by geochemical and petrological findings

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
doaj   +1 more source

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
openaire   +2 more sources

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
doaj   +1 more source

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, S. M. Schmalholz, T. Duretz, T. Duretz   +3 more
doaj   +1 more source