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Titolo:
Density structure of the lithosphere in the southwestern United States andits tectonic significance
Autore:
Kaban, MK; Mooney, WD;
Indirizzi:
US Geol Survey, Menlo Park, CA 94025 USA US Geol Survey Menlo Park CA USA94025 l Survey, Menlo Park, CA 94025 USA Moscow Phys Earth Inst, Moscow 123810, Russia Moscow Phys Earth Inst Moscow Russia 123810 Inst, Moscow 123810, Russia
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B1, volume: 106, anno: 2001,
pagine: 721 - 739
SICI:
0148-0227(20010110)106:B1<721:DSOTLI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHERN SIERRA-NEVADA; UPPER MANTLE STRUCTURE; GREAT-VALLEY; NORTHERN CALIFORNIA; CRUSTAL STRUCTURE; GRAVITY; BENEATH; COMPENSATION; THICKNESS; ISOSTASY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Kaban, MK US Geol Survey, MS 977,345 Middlefield Rd, Menlo Park, CA 94025 USA US Geol Survey MS 977,345 Middlefield Rd Menlo Park CA USA 94025
Citazione:
M.K. Kaban e W.D. Mooney, "Density structure of the lithosphere in the southwestern United States andits tectonic significance", J GEO R-SOL, 106(B1), 2001, pp. 721-739

Abstract

We calculate a density model of the lithosphere of the southwestern UnitedStates through an integrated analysis of gravity, seismic refraction, drill hole, and geological data. Deviations from the average upper mantle density are as much as +/- 3%. A comparison with tomographic images of seismic velocities indicates that a substantial part (>50%) of these density variations is due to changes in composition rather than temperature. Pronounced mass deficits are found in the upper mantle under the Basin and Range Province and the northern part of the California Coast Ranges and adjacent ocean. The density structure of the northern and central/southern Sierra Nevada isremarkably different. The central/southern part is anomalous and is characterized by a relatively light crust underlain by a higher-density upper mantle that may be associated with a cold, stalled subducted plate. High densities are also determined within the uppermost mantle beneath the central Transverse Ranges and adjoining continental slope. The average density of thecrystalline crust under the Great Valley and western Sierra Nevada is estimated to be up to 200 kg m(-3) higher than the regional average, consistentwith tectonic models for the obduction of oceanic crust and uppermost mantle in this region.

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Documento generato il 09/04/20 alle ore 18:53:27