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Titolo:
Primary centers and secondary concentrations of tectonic activity through time in the western hemisphere of Mars
Autore:
Anderson, RC; Dohm, JM; Golombek, MP; Haldemann, AFC; Franklin, BJ; Tanaka, KL; Lias, J; Peer, B;
Indirizzi:
CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA CALTECH Pasadena CA USA 91109 LTECH, Jet Prop Lab, Pasadena, CA 91109 USA Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 & Water Resources, Tucson, AZ 85721 USA US Geol Survey, Astrogeol Team, Flagstaff, AZ 86001 USA US Geol Survey Flagstaff AZ USA 86001 ogeol Team, Flagstaff, AZ 86001 USA Univ Pittsburgh, Dept Geol & Planetary Sci, Pittsburgh, PA 15260 USA Univ Pittsburgh Pittsburgh PA USA 15260 ary Sci, Pittsburgh, PA 15260 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
fascicolo: E9, volume: 106, anno: 2001,
pagine: 20563 - 20585
SICI:
0148-0227(20010925)106:E9<20563:PCASCO>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLANETARY WRINKLE RIDGES; THARSIS REGION; VALLES-MARINERIS; ORIENTATION DATA; ORIGIN; PROVINCE; TOPOGRAPHY; THAUMASIA; EVOLUTION; TROUGHS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Anderson, RC CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA CALTECH 4800 Oak Grove Dr Pasadena CA USA 91109 CA 91109 USA
Citazione:
R.C. Anderson et al., "Primary centers and secondary concentrations of tectonic activity through time in the western hemisphere of Mars", J GEO R-PLA, 106(E9), 2001, pp. 20563-20585

Abstract

Five main stages of radial and concentric structures formed around Tharsisfrom the Noachian through the Amazonian as determined by geologic mapping of 24,452 structures within the stratigraphic framework of Mars and by testing their radial and concentric orientations. Tectonic activity peaked in the Noachian (stage 1) around the largest center, Claritas, an elongate center extending more than 20 degrees in latitude and defined by about half of the total grabens which are concentrated in the Syria Planum, Thaumasia, and Tempe Terra regions. During the Late Noachian and Early Hesperian (stage 2), extensional structures formed along the length of present-day Valles Marineris and in Thaumasia (with a secondary concentration near Warrego Vallis) radial to a region just to the south of the central margin of Valles Marineris. Early Hesperian (stage 3) radial grabens in Pavonis, Syria, Ulysses, and Tempe Terra and somewhat concentric wrinkle ridges in Lunae and SolisPlana and in Thaumasia, Sirenum, Memnonia, and Amazonis are centered northwest of Syria with secondary centers at Thaumasia, Tempe Terra, Ulysses Fossae, and western Valles Marineris. Late Hesperian/Early Amazonian (stage 4)structures around Alba Patera, the northeast trending alignment of TharsisMontes, and Olympus Mons appears centered on Alba Patera. Stage 5 structures (Middle-Late Amazonian) represent the last pulse of Tharsis-related activity and are found around the large shield volcanoes and are centered near Pavonis Mons. Tectonic activity around Tharsis began in the Noachian and generally decreased through geologic time to the Amazonian. Statistically significant radial distributions of structures formed during each stage, centered at different locations within the higher elevations of Tharsis. Secondary centers of radial structures during many of the stages appear related topreviously identified local magmatic centers that formed at different times and locations throughout Tharsis.

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Documento generato il 29/11/20 alle ore 15:28:03