Results 21 to 30 of about 21,832 (251)

A dynamic lithosphere–asthenosphere boundary near the equatorial Mid-Atlantic Ridge

Earth and Planetary Science Letters, 2021
In plate tectonic theory a weak asthenosphere is required to facilitate the motions of the rigid plates. Partial melt could weaken the mantle, in turn impacting convection, but to date the existence of persistent melt has remained controversial.
C. Rychert, S. Tharimena, N. Harmon, Shun-Min Wang, S. Constable, J. Kendall, P. Bogiatzis, M. Agius, D. Schlaphorst   +8 more
semanticscholar   +1 more source

Sheared peridotite and megacryst formation beneath the Kaapvaal craton: a snapshot of tectonomagmatic processes across the lithosphere–asthenosphere transition

, 2021
The cratonic lithosphere–asthenosphere boundary is commonly invoked as the site of sheared peridotite and megacryst formation, a well-recognized petrologic assemblage whose genetic relationships – if any – remain poorly understood. We have undertaken a
S. Tappe, M. Massuyeau, K. Smart, A. Woodland, N. Gussone, Sarah E. M. Milne, A. Stracke   +6 more
semanticscholar   +1 more source

Inference of thermodynamic state in the asthenosphere from anelastic properties, with applications to North American upper mantle

Physics of the Earth and Planetary Interiors, 2020
Inference of thermodynamic state and full-spectrum mechanical behavior of the lithosphere and asthenosphere is a central problem in geophysics, implicating our understanding of the convection patterns, transient responses and chemical composition of the ...
C. Havlin, B. Holtzman, E. Hopper
semanticscholar   +1 more source

Structure and dynamics of the oceanic lithosphere-asthenosphere system

Physics of the Earth and Planetary Interiors, 2020
The thermochemical evolution of oceanic lithosphere and its interaction with the underlying asthenosphere exerts a fundamental control on the dynamics of the Earth system.
F. Richards, M. Hoggard, A. Crosby, S. Ghelichkhan, N. White   +4 more
semanticscholar   +1 more source

Elastic properties of silicate melts: Implications for low velocity zones at the lithosphere-asthenosphere boundary. [PDF]

, 2017
Low seismic velocity regions in the mantle and crust are commonly attributed to the presence of silicate melts. Determining melt volume and geometric distribution is fundamental to understanding planetary dynamics.
Clark, Alisha N, Lesher, Charles E
core   +2 more sources

The westward drift of the lithosphere. A tidal ratchet? [PDF]

, 2018
Is the westerly rotation of the lithosphere an ephemeral accidental recent phenomenon or is it a stable process of Earth’s geodynamics? The reason why the tidal drag has been questioned as the mechanism determining the lithospheric shift relative to ...
Carcaterra, A., Doglioni, C.
core   +2 more sources

The separation of the geomagnetic field originated in the core, in the asthenosphere, and in the crust

Annals of Geophysics, 1999
The separation of the field produced by different internal sources can be accomplished by means of the so-called spatial spectrum of the geomagnetic field of internal origin.
X. Q. Gao, F. T. Gizzi, W. J. Dong, G. P. Gregori   +3 more
doaj   +1 more source

Transient deformations in the Suez-Sinai area from GPS observations [PDF]

, 2005
We analyze data from four GPS campaigns carried out between 1997 and 2002 on a network of 11 sites in the Suez-Sinai, the area of collision between the African and the Arabian plates.
Antonio Piersanti, Barzaghi, Ben-Menahem, Beutler, Blewitt, Bonatti, Bosworth, Calais, Caporali, Cochran, Crespi, De Mets, Doglioni, Doglioni, Dong, Dziewonski, Fattah, Federica Riguzzi, Grazia Pietrantonio, Jackson, Koch, Le Pichon, Mahmoud, Mahmoud, Malkawi, McClay, McClusky, Morellato, Nostro, Piersanti, Piersanti, Piersanti, Pietrantonio, Riguzzi, Ron, Salah M. Mahmoud, Salamon, Sella, Steckler, Steckler, Wdowinski, Wessel   +41 more
core   +1 more source

MID-MIOCENE SEQUENCES OF HIGH- AND MODERATE-MG VOLCANIC ROCKS IN VITIM PLATEAU, SOUTHERN SIBERIA: IMPACT OF A SUB-LITHOSPHERIC CONVECTIVE MATERIAL ON THE LITHOSPHERE

Геодинамика и тектонофизика, 2015
A comparative study of major elements, trace elements, and isotopes in high- and moderate-Mg volcanic sequences of 16–14 and 14–13 Ma, respectively, has been performed in the Bereya volcanic center.
I. S. Chuvashova, S. V. Rasskazov, T. A. Yasnygina, N. N. Fefelov, E. V. Saranina, N. A. Rudneva   +5 more
doaj   +1 more source

Geophysical model of the mantle ore-forming system

Геофизический журнал, 2019
The paper deals with a generalized geophysical model of the mantle ore-forming system that covers three main parts: a) the area of origin of the ore substance; b) its transportation zone and c) the area of concentrated ore-formation ― a deposit.
D. Yosifov, R. Radichev
doaj   +1 more source