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Titolo:
Tempe Fossae, Mars: A planetary analogon to a terrestrial continental rift?
Autore:
Hauber, E; Kronberg, P;
Indirizzi:
German Aerosp Ctr, DLR, Inst Space Technol & Planetary Explorat, D-12489 Berlin, Germany German Aerosp Ctr Berlin Germany D-12489 plorat, D-12489 Berlin, Germany Tech Univ Clausthal, Inst Geol & Palaeontol, D-38678 Clausthal Zellerfeld,Germany Tech Univ Clausthal Clausthal Zellerfeld Germany D-38678 lerfeld,Germany
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
fascicolo: E9, volume: 106, anno: 2001,
pagine: 20587 - 20602
SICI:
0148-0227(20010925)106:E9<20587:TFMAPA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARTIAN MANTLE CONVECTION; VALLES-MARINERIS; THARSIS PROVINCE; GLOBAL SURVEYOR; KENYA RIFT; PHASE-TRANSITIONS; TECTONIC HISTORY; EVOLUTION; EXTENSION; GRAVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: Hauber, E German Aerosp Ctr, DLR, Inst Space Technol & Planetary Explorat,Rutherfordstr 2, D-12489 Berlin, Germany German Aerosp Ctr Rutherfordstr 2Berlin Germany D-12489 ermany
Citazione:
E. Hauber e P. Kronberg, "Tempe Fossae, Mars: A planetary analogon to a terrestrial continental rift?", J GEO R-PLA, 106(E9), 2001, pp. 20587-20602

Abstract

Tempe Terra, the northeastern part of the Tharsis Region on Mars, is characterized by several extensional structures differing in style and age. The Tempe Fossae, a particularly well-developed system of graben striking N45 degreesE, have been studied for the first time in detail on the basis of Viking Orbiter imagery and Mars Observer Laser Altimeter (MOLA) topographic data. The graben system appears to be unique in the whole region because of its extent, the remarkable width and depth of the graben, the varying grabenpattern, and the associated volcanism. Single graben can be up to 35 km wide and 120 km long, while their depth can reach nearly 3000 m. They typically show an asymmetric architecture, often in halfgraben or step fault style. The graben system widens and changes its style along strike from NE to SWfrom a single, very deep, and narrow graben to a complex set of several shallower, sinuous graben and halfgraben. Crustal extension was measured in the northeastern part from the observable throw and amounts to 2.5 - 3.1 km. Volcanic structures can be found at several locations along the graben. Inthe SW the graben system seems to be connected with the Tempe Terra volcanic province marked by flood basalts and plains volcanism. Craters were counted on volcanic units unaffected by extensional tectonics. Crater statistics indicate an absolute crater model age for the upper end of the extensional deformation of similar to3.5 Ga. The dimensions and the characteristics of the mapped graben system resemble those of terrestrial continental rifts,and a comparison between them and the Kenya Rift reveals striking similarities. Therefore the Tempe Fossae are interpreted as a Martian analog to a continental rift associated with an underlying mantle plume. This hypothesisseems to be supported by recent geophysical models based on topography andgravity data from Mars Global Surveyor which indicate regional uplift for Tempe Terra.

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Documento generato il 02/06/20 alle ore 01:56:15