Comparison of Volcanic Features of Elysium (Mars) and Tibesti (Earth)
Comparison of volcanic features of Elysium (Mars) and Tibesti (Earth) MICHAEL C. MALIN* Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 ABSTRACT the Tharsis region, which represent the Emi Koussi (19.7°N, 18.5°E; Fig. 1), largest and most conspicuous examples of situated at the extreme southern portion of The Elysium volcanic province on Mars martian volcanism (McCauley and others, the volcanic region, ranges from 60 to 80 and the Tibesti volcanic province in Chad, 1972; Carr, 1973, 1974). Comparison with km across and consists of 2,000 m of vol- Africa, were studied using Mariner 9, terrestrial volcanoes, especially those on the canics resting on Paleozoic and Cretaceous Landsat and Apollo photography. Elysium island of Hawaii, has been most fruitful sandstones which have been uplifted 1,500 Mons on Mars and Emi Koussi on Earth (Greeley, 1973). m. The original cone may have reached as show remarkable similarities in summit In this paper, another martian volcanic much as 4,000 m above sea level but is now caldera and flank morphologies. Each has a province will be studied. The Elysium re- only 3,415 m high, with a large (15-km), large central caldera —12 km in diameter gion has several structures which are not multiple-crater caldera some 500 m deep at and from 500 to 1,000 m deep; both cal- found elsewhere on Mars, as well as some the summit. Much of the volcanism oc- deras contain numerous craters and large, which are similar to those of Tharsis. Com- curred during the middle and late Tertiary, irregular pits.
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