Results 81 to 90 of about 27,222 (235)

A Synoptic View of Mantle Plume Shapes Enabled by Virtual Reality

Geochemistry, Geophysics, Geosystems
The shapes of mantle plumes are sensitive to mantle viscosity, density structure, and flow patterns. Increasingly, global tomographic models reveal broad plume conduits in the lower mantle and highly tilting conduits in the mid and upper mantle. Previous
Qianyi Lu, Maxwell L. Rudolph
doaj   +1 more source

The Probability of Mantle Plumes in Global Tomographic Models

Geochemistry, Geophysics, Geosystems, 2020
While the downward mass flux in the Earth's deep interior is well constrained by seismic tomography, the upward flux is still poorly understood and debated.
Augustin Marignier, Ana M. G. Ferreira, Thomas Kitching   +2 more
doaj   +1 more source

Zircon Dates Long‐Lived Plume Dynamics in Oceanic Islands

Geochemistry, Geophysics, Geosystems, 2022
In this contribution we report the first systematic study of zircon U‐Pb geochronology and δ18O‐εHf(t) isotope geochemistry from 10 islands of the hot‐spot related Galapagos Archipelago.
Yamirka Rojas‐Agramonte, Boris J. P. Kaus, Andrea Piccolo, Ian S. Williams, Axel Gerdes, Jean Wong, HangXian Xie, Stephan Buhre, Theofilos Toulkeridis, Pilar Montero, Antonio Garcia‐Casco   +10 more
doaj   +1 more source

Plume–Lithosphere Interaction and the Role of the Mid‐Lithospheric Discontinuity in Craton Delamination

Geophysical Research Letters
We present results from thermo‐mechanical numerical modeling of interactions between thermal, thermo‐compositional, and purely compositional (hydrous) mantle plumes, and a rheologically layered lithosphere containing a mid‐lithospheric discontinuity (MLD)
Alessio Lavecchia, István Kovács, Alexander Koptev, Sierd Cloetingh   +3 more
doaj   +1 more source

Mantle Potential Temperature Estimates and Primary Melt Compositions of the Low-Ti Emeishan Flood Basalt

Frontiers in Earth Science, 2018
The Late Permian Emeishan large igneous province (ELIP) is considered to be one of the best examples of a mantle plume derived large igneous province. One of the primary observations that favor a mantle plume regime is the presence of ultramafic volcanic
J. G. Shellnutt, Thuy T. Pham
doaj   +1 more source

Symmetry and plate-like convection in fluids with temperature-dependent viscosity [PDF]

, 2014
We explore the instabilities developed in a fluid in which viscosity depends on temperature. In particular, we consider a dependency that models a very viscous (and thus rather rigid) lithosphere over a convecting mantle.
Curbelo, Jezabel, Mancho, Ana M.
core   +1 more source

On the relative motions of long-lived Pacific mantle plumes

Nature Communications, 2018
Using mantle plumes to reconstruct past plate motion is complicated, because plumes may not be fixed. Here, the authors demonstrate using 40Ar/39Ar ages that the Rurutu plume is relatively stable compared to the rapidly moving Hawaiian plume, yet it has ...
Kevin Konrad, Anthony A. P. Koppers, Bernhard Steinberger, Valerie A. Finlayson, Jasper G. Konter, Matthew G. Jackson   +5 more
doaj   +1 more source

Radial rift and block tectonics around the Tharsis bulge: Introductional postulation [PDF]

Although the Vallis Marineris canyon and radial fossae grabens have been extensively studied, their origin and formation mechanism is still the subject of numerous questions.
Raitala, J.
core   +1 more source

Age, Depth, and Residual Depth Anomalies in the North Pacific: Implications for Thermal Models of the Lithosphere and Upper Mantle [PDF]

, 1986
We present an empirical basement depth versus age relation for the North Pacific Ocean, based on the statistical treatment of an ocean-wide gridded data set.
Renkin, Miriam K., Sclater, John G.
core   +1 more source

Lawnmower Poetry and the Poetry of Lawnmowers

Critical Quarterly, EarlyView.
Francesca Gardner
wiley   +1 more source