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Titolo:
GEOLOGICAL EVOLUTION OF VENUS - RISES, PLAINS, PLUMES, AND PLATEAUS
Autore:
PHILLIPS RJ; HANSEN VL;
Indirizzi:
WASHINGTON UNIV,DEPT EARTH & PLANETARY SCI,CAMPUS BOX 1169,1 BROOKINGS DR ST LOUIS MO 63130 SO METHODIST UNIV,DEPT GEOL SCI DALLAS TX 75275
Titolo Testata:
Science
fascicolo: 5356, volume: 279, anno: 1998,
pagine: 1492 - 1497
SICI:
0036-8075(1998)279:5356<1492:GEOV-R>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMPACT CRATER DENSITIES; RESURFACING HISTORY; TESSERA TERRAIN; EISTLA REGIO; BETA-REGIO; HOT-SPOT; MAGELLAN; TECTONICS; GEOPHYSICS; CONVECTION;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
R.J. Phillips e V.L. Hansen, "GEOLOGICAL EVOLUTION OF VENUS - RISES, PLAINS, PLUMES, AND PLATEAUS", Science, 279(5356), 1998, pp. 1492-1497

Abstract

Crustal plateaus and volcanic rises, major physiographic features on Venus, both formed over mantle plumes. Crustal plateaus were produced by large degrees of plume melting beneath thin lithosphere. The oldesttectonic features in crustal plateaus are ribbon-like troughs indicating early uplift and tensile stretching; their shallow depths suggest that surface temperature there was higher in the past. Widespread volcanic plains, derived from the broad upwellings of internally heated mantle convection, were continually erupted during the time of crustal plateau formation. Discrete volcanic rises, younger than crustal plateaus, formed over a thicker lithosphere, with less plume partial melting, The presence of only one transitional form indicates that the lithosphere thickened rapidly. Thermal and magmatic models show that the formation of these major features can be tied to an expected change in mantle convective style about 1 billion years ago.

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Documento generato il 27/11/20 alle ore 02:16:28