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Titolo:
Recent tectonic and lithospheric thermal evolution of Venus
Autore:
Brown, CD; Grimm, RE;
Indirizzi:
Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA Washington Univ St Louis MO USA 63130 anetary Sci, St Louis, MO 63130 USA Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 Space Phys Lab, Boulder, CO 80309 USA
Titolo Testata:
ICARUS
fascicolo: 1, volume: 139, anno: 1999,
pagine: 40 - 48
SICI:
0019-1035(199905)139:1<40:RTALTE>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMPACT CRATER DENSITIES; HEAT-FLOW; GLOBAL DISTRIBUTION; TESSERA TERRAIN; ARTEMIS-CHASMA; MAGELLAN DATA; DEFORMATION; CORONAE; TOPOGRAPHY; HIGHLANDS;
Keywords:
Venus; geophysics; tectonics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Brown, CD Washington,Univ, Dept Earth & Planetary Sci, Campus Box 1169,1 Brookings Dr Washington Univ Campus Box 1169,1 Brookings Dr St Louis MO USA 63130
Citazione:
C.D. Brown e R.E. Grimm, "Recent tectonic and lithospheric thermal evolution of Venus", ICARUS, 139(1), 1999, pp. 40-48

Abstract

Venus, a planet similar in size, mass, and substance to Earth, has clearlyundergone a vastly different thermal evolution because it does not currently lose heat by means of plate tectonics. Other manifestations of this difference are the thickness of the mechanical lithosphere and the geothermal gradient, which are intrinsic to the outer thermal boundary layer of the mantle convective system and are regulated by the interior heat loss. Observedtectonic styles and the results of geodynamic modeling indicate that the mean lithospheric thickness on Venus has increased with time. Pervasive deformation of the plateau highlands tessera, the oldest preserved terrain, requires a weak, thin lithosphere. Later features, such as ridge belts, coronae, chasmata, and shield volcanoes, reflect a lithosphere of intermediate thickness that causes deformation to be distributed. A broad are of focused, coherent underthrusting at Artemis Chasma and the inferred partial regionalsupport of volcanic highlands suggest that at present the average lithosphere is considerably stronger and thicker, and the heat flow much lower, than expected by comparison to Earth. The relatively thin lithosphere at youngvolcanic structures is consistent with localized reheating, while the few features representative of the thermally stable plains are suggestive of a similar to 200-km thermal lithosphere. Heat loss on Venus today cannot be in steady state with mantle radiogenic heat production. Collectively, the deformation styles and modeled lithospheric thicknesses imply a passive, monotonic cooling of the thermal boundary layer over the interval of Venus's history recorded on the surface, approximately the past billion years. (C) 1999 Academic Press.

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Documento generato il 27/11/20 alle ore 01:17:16