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Titolo:
Tharsis dome, Mars: New evidence for Noachian-Hesperian thick-skin and Amazonian thin-skin tectonics
Autore:
Anguita, F; Farelo, AF; Lopez, V; Mas, C; Munoz-Espadas, MJ; Marquez, A; Ruiz, J;
Indirizzi:
Univ Complutense, Dept Petr & Geoquim, E-28040 Madrid, Spain Univ Complutense Madrid Spain E-28040 r & Geoquim, E-28040 Madrid, Spain CSIC, INTA, Ctr Astrobiol, Madrid, Spain CSIC Madrid SpainCSIC, INTA, Ctr Astrobiol, Madrid, Spain Univ Complutense, Dept Geofis & Meteorol, E-28040 Madrid, Spain Univ Complutense Madrid Spain E-28040 & Meteorol, E-28040 Madrid, Spain CSIC, Museo Nacl Ciencias Nat, Dept Geol, E-28006 Madrid, Spain CSIC Madrid Spain E-28006 Ciencias Nat, Dept Geol, E-28006 Madrid, Spain Univ Complutense, Dept Geodinam, E-28040 Madrid, Spain Univ Complutense Madrid Spain E-28040 pt Geodinam, E-28040 Madrid, Spain
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
fascicolo: E4, volume: 106, anno: 2001,
pagine: 7577 - 7589
SICI:
0148-0227(20010425)106:E4<7577:TDMNEF>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMAL EVOLUTION; GLOBAL SURVEYOR; VALLES-MARINERIS; WRINKLE RIDGES; REGION; GRAVITY; CONSTRAINTS; LITHOSPHERE; PROVINCE; PLATEAU;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Anguita, F Univ Complutense, Dept Petr & Geoquim, E-28040 Madrid, Spain Univ Complutense Madrid Spain E-28040 , E-28040 Madrid, Spain
Citazione:
F. Anguita et al., "Tharsis dome, Mars: New evidence for Noachian-Hesperian thick-skin and Amazonian thin-skin tectonics", J GEO R-PLA, 106(E4), 2001, pp. 7577-7589

Abstract

A photogeological reconnaissance of Viking mosaics and images of the Tharsis dome has been carried out. Fifteen new areas of transcurrent faulting have been located which, together with Other structures previously detected, support a model in which the Thaumasia Plateau, the southeastern part of the Tharsis dome, is proposed to be an independent lithospheric block that experienced buckling and thrust faulting in Late Noachian or Early Hesperian times as a result of an E-W directed compression. Evidence is presented that this stress field, rather than the Tharsis uplift, was decisive in the inception of Valles Marineris, which we consider a transtensive, dextral accident. The buckling spacing permits us, moreover, to tentatively reconstructa Martian Hesperian lithosphere similar id elastic thickness to the mean present terrestrial oceanic lithosphere, thus supporting the possibility of a restricted lithospheric mobility in that period. Tharsis lithosphere was again subjected to shear stresses in Amazonian times, a period in which important accidents, such as strike-slip faults, wrinkle ridges, and straight and sigmoidal graben, were formed under a thin-skin tectonic regime, while the lithosphere as a mechanical unit had become too thick and strong to buckle. The possible causes of those stresses, and especially their relationships to a putative period of plate tectonics, are discussed.

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Documento generato il 05/12/20 alle ore 06:03:19