Results 31 to 40 of about 2,132,735 (177)

Melting of recycled ancient crust responsible for the Gutenberg discontinuity

Nature Communications, 2020
The seismic Gutenberg discontinuity has long been associated with the lithosphere-asthenosphere boundary, yet the physical explanation of what is causing the discontinuity remains debated.
Jia Liu, Naoto Hirano, Shiki Machida, Qunke Xia, Chunhui Tao, Shili Liao, Jin Liang, Wei Li, Weifang Yang, Guoying Zhang, Teng Ding   +10 more
doaj   +1 more source

Stepwise Lithospheric Delamination Leads to Pulsed Cenozoic Uplifts of Central Tien Shan

Lithosphere, 2022
The Tien Shan provides an ideal site to study mechanism of intracontinental orogeny due to distant effect of Indo-Asian collision. We investigate lithospheric structures, in particular the lithosphere-asthenosphere boundary (LAB), of Central Tien Shan ...
Haixiang Zhao, Zhouchuan Huang, Xiaohui Yuan   +2 more
doaj   +1 more source

A Lithosphere‐Asthenosphere Boundary and Partial Melt Estimated Using Marine Magnetotelluric Data at the Central Middle Atlantic Ridge

Geochemistry Geophysics Geosystems, 2020
The differential motion between the lithosphere and the asthenosphere is aseismic, so the magnetotelluric (MT) method plays an important role in studying the depth and nature of the lithosphere‐asthenosphere boundary (LAB).
Shunguo Wang, S. Constable, C. Rychert, N. Harmon   +3 more
semanticscholar   +1 more source

The application of a gravimetric forward modelling of the lithospheric structure for an estimate of the average density of the upper asthenosphere

Geodesy and Geodynamics, 2019
The average density of 3300 kg m−3 is often attributed for the asthenosphere. In this study, we inspect this value by estimating the average value of the (upper) asthenosphere based on applying the gravimetric forward modelling of major known ...
Wenjin Chen, Robert Tenzer
doaj   +1 more source

Upper Mantle Anisotropic Shear Velocity Structure at the Equatorial Mid‐Atlantic Ridge Constrained by Rayleigh Wave Group Velocity Analysis From the PI‐LAB Experiment

Geochemistry, Geophysics, Geosystems, 2021
The evolution of ocean lithosphere and asthenosphere are fundamental to plate tectonics, yet high resolution imaging is rare. We present shear wave velocity and azimuthal anisotropy models for the upper mantle from Rayleigh wave group velocities from ...
Utpal Saikia, Catherine Rychert, Nicholas Harmon, J. M. Kendall   +3 more
doaj   +1 more source

The Nature of the Lithosphere‐Asthenosphere Boundary

Journal of Geophysical Research - Solid Earth, 2020
Plate tectonic theory was developed 50 years ago and underpins most of our understanding of Earth's evolution. The theory explains observations of magnetic lineations on the seafloor, linear volcanic island chains, large transform fault systems, and deep
C. Rychert, N. Harmon, S. Constable, Shunguo Wang   +3 more
semanticscholar   +1 more source

A New View of Shear Wavespeed and the Lithosphere‐Asthenosphere Boundary in the Southwestern United States

Journal of Geophysical Research - Solid Earth
The Southwestern United States experiences active deformation, seismicity, and magmatism, remarkable in an intraplate setting. The Basin and Range and Colorado Plateau (CP) are inferred to differ in lithospheric thickness, but modeling geophysical ...
E. Golos, B. Brunsvik, Z. Eilon, K. Fischer, J. Byrnes, J. Gaherty, AL Golos   +6 more
semanticscholar   +1 more source

Stability of hydrous basaltic melts at low water fugacity: evidence for widespread melting at the lithosphere-asthenosphere boundary

Contributions to Mineralogy and Petrology
The upper mantle low velocity zone is often attributed to partial melting at the lithosphere-asthenosphere boundary. This implies that basaltic melts may be stable along plausible geotherms due to the freezing point depression in the presence of water ...
M. Putak Juriček, H. Keppler
semanticscholar   +1 more source

Relationships Between Upper-Plate Structure, Mantle Wedge Melting, and Fore-Arc Sliver Transport in the Nicaraguan Subduction Zone

The Seismic Record
This study images the base of the upper-plate lithosphere in the Nicaraguan subduction zone using common conversion point stacking of Sp phases and explores the relationships between deep upper-plate structure, subduction zone melting processes, and the ...
Emily Carrero Mustelier, Karen M. Fischer, Junlin Hua, Isabella Gama, Peter C. La Femina, Machel Higgins   +5 more
doaj   +1 more source

Is There a Global Carbonate Layer in the Oceanic Mantle?

Geophysical Research Letters, 2021
Previous modeling of carbonate subduction by high‐pressure experimentation has allowed to propose scenarios for bulk carbon return to the mantle, but the detailed transfer mechanisms have seldom been studied.
T. Hammouda, G. Manthilake, P. Goncalves, J. Chantel, J. Guignard, W. Crichton, F. Gaillard   +6 more
doaj   +1 more source