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Titolo:
COMPRESSIONAL TECTONISM ON MARS
Autore:
WATTERS TR;
Indirizzi:
SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,CTR EARTH & PLANETARY STUDIES WASHINGTON DC 20560
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
fascicolo: E9, volume: 98, anno: 1993,
pagine: 17049 - 17060
SICI:
2169-9097(1993)98:E9<17049:CTOM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
THARSIS REGION; LITHOSPHERIC STRESS; TERRESTRIAL PLANETS; WRINKLE RIDGES; ORIGIN; SERENITATIS; HIGHLANDS; EVOLUTION; THICKNESS; PROVINCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
T.R. Watters, "COMPRESSIONAL TECTONISM ON MARS", J GEO R-PLA, 98(E9), 1993, pp. 17049-17060

Abstract

Contractional features on Mars were identified on the basis of photogeologic evidence of crustal shortening and comparison with terrestrialand planetary analogs. Three classes of structures, wrinkle ridges, lobate scarps and high-relief ridges, were mapped and their spatial andtemporal distribution assessed. Wrinkle ridges account for over 80% of the total cumulative length of the mapped contractional features andoccur in smooth plains material interpreted to be volcanic in origin. Lobate scarps, not wrinkle ridges, are the dominant contractional feature in Martian highland material. The pattern of contractional features in the western hemisphere reflects the hemispheric-scale influence of the Tharsis rise. Although no comparable hemispheric-scale pattern is observed in die eastern hemisphere, prominent regional-scale patterns exist, the most notable of which occurs in Hesperia Planum. Contractional features that locally parallel the trend of the crustal dichotomy boundary in the eastern hemisphere suggest the influence of stresses related to the evolution of die dichotomy. Compressional deformationapparently peaked during the Early Hesperia, if the tectonic featuresare roughly the same age as the units in which they occur. This peak in compressional deformation corresponds with Early Hesperian volcanicresurfacing of a large portion of the planet. Thermal history models for Mars, based on an initially hot planet, are inconsistent with estimates of die timing of peak compressional tectonism and the rate of volcanism. A pulse of global volcanism during the Early Hesperian may have resulted in a punctuated episode of rapid cooling and global contraction that contributed to compressional tectonism. Although global contraction may have contributed a significant component of die total stress that resulted in compressional deformation on Mars, nonhydrostatichorizontal stresses derived from local and regional-scale sources arenecessary to account for the uniform orientations of die tectonic features.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 06:08:51