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Titolo:
Testing the fixed hotspot hypothesis using Ar-40/Ar-39 age progressions along seamount trails
Autore:
Koppers, AAP; Morgan, JP; Morgan, JW; Staudigel, H;
Indirizzi:
Univ Calif San Diego, Scripps Inst Oceanog, Inst Geophys & Planetary Phys,La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ry Phys,La Jolla, CA 92093 USA Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA Princeton Univ Princeton NJ USA 08544 ept Geosci, Princeton, NJ 08544 USA
Titolo Testata:
EARTH AND PLANETARY SCIENCE LETTERS
fascicolo: 3-4, volume: 185, anno: 2001,
pagine: 237 - 252
SICI:
0012-821X(20010228)185:3-4<237:TTFHHU>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PACIFIC PLATE MOTION; ATLANTIC HOTSPOTS; LATITUDINAL SHIFT; RELATIVE MOTIONS; HAWAIIAN HOTSPOT; VOLCANIC CHAINS; FRACTURE-ZONE; LINE ISLANDS; HOT-SPOTS; MANTLE;
Keywords:
hot spots; movement; plate tectonics; Ar-40/Ar-39; geochronology; seamounts; Pacific Plate;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Koppers, AAP Univ Calif San Diego, Scripps Inst Oceanog, Inst Geophys & Planetary Phys,La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 lla, CA 92093 USA
Citazione:
A.A.P. Koppers et al., "Testing the fixed hotspot hypothesis using Ar-40/Ar-39 age progressions along seamount trails", EARTH PLAN, 185(3-4), 2001, pp. 237-252

Abstract

Hotspots and their associated intra-plate volcanism producing seamount trails have become an accepted fact in geology from a conceptual theory. The azimuths and age progressions of these seamount trails provide the only means to determine absolute plate motions with respect to an independent reference frame of 'fixed' hotspots. However, the presumed fixity of hotspots is in disagreement with recent paleomagnetic studies and global-circuit plate reconstructions for the Hawaiian-Emperor seamount trail. In this study, we provide independent evidence suggesting that hotspots are not fixed relative to each other. We use a straightforward test that compares the observed Ar-40/Ar-39 age progressions along Pacific seamount trails (0-140 Myr) with the Pacific plate velocities as predicted by their poles of plate rotation (i.e. Euler poles), In most of these comparisons, the age progressions werefound incompatible with published Euler poles, or with a new set of Euler poles as derived in this study using discrete seamount locations digitized from the bathymetry maps of Smith and Sandwell [EOS 77 (1996) 315; Science 277 (1997) 1956-1921]. We conclude that the relative motion between hotspots may be required to reconcile the observed age progressions with the predicted plate velocities from their modeled Euler poles. On average, the Pacific hotspots may show motion at 10-60 mm/yr over the last 100 Myr, partly attributed to individual hotspot motion, whereas systematic motion of these hotspots (due to true polar wander) may account for the remainder. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/04/20 alle ore 12:50:03