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Titolo:
Late cretaceous polar wander of the Pacific plate: Evidence of a rapid true polar wander event
Autore:
Sager, WW; Koppers, AAP;
Indirizzi:
Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 ceanog, College Stn, TX 77843 USA 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
Titolo Testata:
SCIENCE
fascicolo: 5452, volume: 287, anno: 2000,
pagine: 455 - 459
SICI:
0036-8075(20000121)287:5452<455:LCPWOT>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
EARLY TERTIARY; LINE ISLANDS; SEAMOUNT MAGNETISM; GEOMAGNETIC-FIELD; HOTSPOT VOLCANISM; HOT SPOT; PALEOMAGNETISM; MOTIONS; MAGNETIZATION; ATLANTIC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Sager, WW Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 llege Stn, TX 77843 USA
Citazione:
W.W. Sager e A.A.P. Koppers, "Late cretaceous polar wander of the Pacific plate: Evidence of a rapid true polar wander event", SCIENCE, 287(5452), 2000, pp. 455-459

Abstract

We reexamined the Late Cretaceous-early Tertiary apparent polar wander path for the Pacific plate using 27 paleomagnetic poles from seamounts dated by Ar-40/Ar-39 geochronology. The path shows little motion from 120 to 90 million years ago (Ma), northward motion from 79 to 39 Ma, and two groups of poles separated by 16 to 21 degrees with indistinguishable mean ages of 84 /- 2 Ma. The latter phenomenon may represent a rapid polar wander episode (3 to 10 degrees per million years) whose timing is not adequately resolvedwith existing data. Similar features in other polar wander paths imply that the event was a rapid shift of the spin axis relative to the mantle (truepolar wander), which may have been related to global changes in plate motion, large igneous province eruptions, and a shift in magnetic field polarity state.

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Documento generato il 04/04/20 alle ore 11:51:18