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Titolo:
How many Pacific hotspots are fed by deep-mantle plumes?
Autore:
Clouard, V; Bonneville, A;
Indirizzi:
Univ Polynesie Francaise, Jeune Equipe Terre Ocean, Faa, Fr Polynesia UnivPolynesie Francaise Faa Fr Polynesia erre Ocean, Faa, Fr Polynesia Inst Phys Globe, UMR Geosci Marines, F-75005 Paris, France Inst Phys Globe Paris France F-75005 osci Marines, F-75005 Paris, France
Titolo Testata:
GEOLOGY
fascicolo: 8, volume: 29, anno: 2001,
pagine: 695 - 698
SICI:
0091-7613(200108)29:8<695:HMPHAF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRUSTAL STRUCTURE; RAPID FORMATION; PLATE MOTIONS; CHAIN; VOLCANISM; ORIGIN; CONVECTION; LINE;
Keywords:
Pacific plate; mantle plume; hotspot track; oceanic plateau;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Clouard, V Univ Polynesie Francaise, Jeune Equipe Terre Ocean, BP 6570, Faa, Fr Polynesia Univ Polynesie Francaise BP 6570 Faa Fr Polynesia r Polynesia
Citazione:
V. Clouard e A. Bonneville, "How many Pacific hotspots are fed by deep-mantle plumes?", GEOLOGY, 29(8), 2001, pp. 695-698

Abstract

The Pacific plate is usually considered to host 14 hotspots, but most of this volcanism does not seem to originate from deep-mantle plumes. To reach this conclusion, we tried to establish how many of the seamount alignments on the Pacific plate correspond to classic hotspots, i.e., long-lived hotspots linked to oceanic basaltic plateaus. We retraced the tracks of the 14 Pacific hotspots by using (1) the absolute stage poles representing the Pacific plate absolute motion since 145 Ma, (2) an updated compilation of radiometric ages of seamounts and oceanic plateaus totaling 266 seamounts or islands, (3) the detailed bathymetry of the Pacific Ocean, and (4) the presentlocations of the hotspots. This analysis allowed us to correlate only three hotspots with the beginning of their tracks possibly corresponding in space and time to an oceanic plateau: Easter to the eastern Mid-Pacific Mountains, Louisville to the Ontong Java plateau, and, with less confidence, Marquesas to Hess Rise and Shatsky Ridge. In addition, the Hawaii hotspot has produced long-lived volcanism. These four are the only classic hotspots on the Pacific plate. However, seven hotspots present short tracks (< 35 m.y.) that cannot be traced to an oceanic plateau and thus are not related to anydeep-mantle phenomena: Foundation, Macdonald, Pitcairn, Rarotonga, Rurutu,Samoa, and Society. The two northeast Pacific hotspots, Kodiak-Bowie and Cobb, and the Caroline hotspot are unclassifiable because of close proximityto a subduction zone where the prior history of volcanism has been lost.

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Documento generato il 10/04/20 alle ore 15:22:24