Results 151 to 160 of about 1,707 (195)

Mantle plumes and geochemistry

Chemical Geology, 2007
Abstract There is considerable interest in the extent to which mantle plumes exist, how many there may be, and how best they can be recognized. It has proved unexpectedly difficult to image them consistently from seismology, and it has been suggested that they may be recognized from the geochemistry of rocks erupted at the Earth's surface.
Chris Hawkesworth, Anders Scherstén
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Mantle plume tomography

Chemical Geology, 2007
We review the resolution currently available with seismic tomography, in particular the ability of seismic waves to image mantle plumes, and discuss frequently asked questions about artifacts, interpretation and possible systematic errors. These aspects are discussed in more detail for two case histories offering different problems in the tomographic ...
Guust Nolet, Richard Allen, Dapeng Zhao
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Iceland Mantle Plume

Nature, 1973
O'HARA1 has objected to my interpretation concerning the trace element chemistry of lavas erupted along the Iceland-Reykjanes Ridge System2 on the ground that: (1) Such magmas are not “primary magmas” but residual liquids; (2) instead, such lavas have suffered prior to eruption extensive “gabbro fractionation” at low pressure (olivine-augite ...
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Chemical plumes in the mantle

Geological Society of America Bulletin, 1975
In developing the concept that chemical plumes have a deep-mantle origin, I propose that plumes result from original chemical inhomogeneities in the Earth. According to the hypothesis of in-homogeneous planetary accretion, the terrestrial planets formed with refractory cores and volatile-rich outer shells, that is, they are layered according to the ...
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The elusive mantle plume

Earth and Planetary Science Letters, 2003
Abstract Mantle plumes are hypothetical hot, narrow mantle upwellings that are often invoked to explain hotspot volcanism with unusual geophysical and geochemical characteristics. The mantle plume is a well-established geological structure in computer modeling and laboratory experiments but an undisputed seismic detection of one has yet to be made ...
Jeroen Ritsema, Richard M. Allen
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Evidence for mantle plumes?

Nature, 2007
Geophysical hotspots have been attributed to partially molten asthenosphere, fertile blobs, small-scale convection and upwellings driven by core heat. Most are short-lived or too close together to be deeply seated, and do not have anomalous heat flow or temperature; many are related to tectonic features. Bourdon et al.
Anderson, Don L., Natland, James H.
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Mantle plumes persevere

Nature Geoscience, 2011
The ocean floor is littered with hundreds of thousands of mostly extinct volcanoes. The origin of at least some of these seamounts seems to rest with mantle plumes.
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PALEOGEOTHERMS AND MANTLE PLUMES

International Geology Review, 1986
Translated from "Paleogeotermy i mantiynyye strui," Izvestiya AN SSSR, seriya geologicheskaya, 1986, No. 7, pp. 16-25. The author is with the Institute of the Lithosphere, USSR Academy of Sciences, Moscow. On the basis of his recalibration of xenolith thermobarometers, he distinguishes convective geothermal gra­ dients associated with mantle plumes ...
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Density and viscosity changes between depleted and primordial mantle at ∼1000 km depth influence plume upwelling behavior

Earth and Planetary Science Letters, 2021
Zhensheng Wang, Timothy Kusky, Guanjie Xiang   +2 more
exaly  

Plate tectonics and mantle controls on plume dynamics

Earth and Planetary Science Letters, 2020
Nicolas Coltice, Nicolas Flament, Maelis Arnould   +2 more
exaly