Probing South Pacific Mantle Plumes With Ocean Bottom Seismographs | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Probing South Pacific Mantle Plumes With Ocean Bottom Seismographs

Type de publication:

Journal Article

Source:

Eos, Transactions, American Geophysical Union, Volume 86, Ticket 44, p.429 (2005)

ISBN:

0096-3941

URL:

http://www.agu.org/

Mots-clés:

CO2, UMR 7154

Résumé:

The seismic structure beneath the South Pacific superswell has not been well explored in spite of its significance for mantle dynamics.The region is characterized by a topographic high of more than 680 m [Adam and Bonneville, 2005]; a concentration of hot spot island chains (e.g., Society, Cook-Austral, Marquesas, and Pitcairn) whose volcanic rocks have isotopic characteristics suggesting deep mantle origin; and a broad, low-velocity anomaly in the lower mantle that has been revealed by seismic tomography. These observations suggest the presence of a large-scale mantle flow from the bottom of the mantle beneath the region, which is called a “superplume”[McNutt,1998].