Results 81 to 90 of about 3,317 (237)

Magmatism of the Kenya Rift Valley : a review. [PDF]

, 2003
Tertiary–Recent magmatism in the Kenya Rift Valley was initiated c. 35 Ma, in the northern part of Kenya. Initiation of magmatism then migrated southwards, reaching northern Tanzania by 5–8 Ma.
MacDonald, Raymond
core  

Synthetic seismic signature of thermal mantle plumes

, 2004
The first seismic images of mantle plumes have been a source of significant debate. To interpret these images, it is useful to have an idea of a plume's expected seismic signature.
CAMMARANO, FABIO, Goes, Saskia, Hansen, Ulrich   +2 more
core   +1 more source

The composition of mantle plumes and the deep Earth [PDF]

, 2016
Highlights • Mantle plumes have broadly distinctive depleted and enriched compositions. • The Earth's lower mantle has a non-chondritic composition. • The deep mantle has large planetary-scale geochemical heterogeneity.
Hastie, Alan, Fitton, John, Hoernle, Kaj, Hastie, Alan R., Kerr, Andrew C., Fitton, J. Godfrey, Schwindrofska, Antje, Kerr, Andrew, McDonald, Iain   +8 more
core   +1 more source

Control of the symmetry of plume-ridge interaction by spreading ridge geometry

, 2010
The Iceland, Gal´apagos and Azores plumes have previously been identified as interacting asymmetrically with adjacent spreading centres. We present evidence that the flow fields in these plume heads are radially symmetric, but the geometry of the mid ...
Maclennan, J., O. Shorttle, Jones, S. M., J. Maclennan, Shorttle, O., Shorttle, O, S. M. Jones, Maclennan, J, Jones, Stephen; id_orcid   +8 more
core   +1 more source

Constraining the source of mantle plumes [PDF]

, 2016
In order to link the geochemical signature of hot spot basalts to Earth's deep interior, it is first necessary to understand how plumes sample different regions of the mantle.
Crameri, Fabio, Whitehead, JA, Cagney, Neil, Crameri, F, Cotel, A, Whitehead, John A., Newsome, WH, Lithgow-Bertelloni, C, Cotel, Aline, Hart, Stanley R., Newsome, William H., Cagney, N, Hart, SR, Lithgow-Bertelloni, Carolina   +13 more
core   +1 more source

A case for mantle plumes

Chinese Science Bulletin, 2005
The existence of at least several plumes in the Earth’s mantle can be inferred with few assumptions from wellestablished observations. As well, thermal mantle plumes can be predicted from wellestablished and quantified fluid dynamics and a plausible assumption about the Earth’s early thermal state.
openaire   +2 more sources

The energetics of melting fertile heterogeneities within the depleted mantle

To explore the consequences of mantle heterogeneity for primary melt production, we develop a mathematical model of energy conservation for an upwelling, melting body of recycled oceanic crust embedded in the depleted upper mantle.
Katz, R. F., Rudge, John F.
core   +1 more source

Seismic Expressions of Thermochemical Mantle Plumes [PDF]

, 2011
Over the last decade of geophysical research the concepts of hotspots and plumes have taken a central role in discussions of the interior structure of the Earth and global geodynamic plate and convection models. In this study, I focus on the ability of
Goes, Saskia, Styles, Elinor Elizabeth
core   +1 more source

Northward drift of the Azores plume in the Earth’s mantle

Nature Communications, 2019
Tectonic plate motions are often reconstructed based on the assumption that mantle plumes are fixed within the mantle. Here, the authors provide geochemical and geodynamic evidence to suggest that the asymmetry of the Azores thermal anomaly can be ...
Maëlis Arnould, Jérôme Ganne, Nicolas Coltice, Xiaojun Feng   +3 more
doaj   +1 more source

Questioning mantle plumes [PDF]

Physics Today, 2012
N/A ; © 2012 by the American Institute of Physics.
openaire   +2 more sources