Марстағы Елісейлік жанартау аймағы

2nd largest volcanic region of Mars
the volcanic province on Mars

Elysium, located in the Elysium and Cebrenia quadrangles,. The region includes the volcanoes (from north to south) Hecates Tholus, Elysium Mons and Albor Tholus. The province is centered roughly on Elysium Mons at Elysium Planitia is a broad plain to the south of Elysium, centered at Another large volcano, Apollinaris Mons, lies south of Elysium Planitia and is not part of the province. Besides having large volcanoes, Elysium has several areas with long trenches, called fossa or fossae (plural) on Mars. They include the Cerberus Fossae, Elysium Fossae, Galaxias Fossae, Hephaestus Fossae, Hyblaeus Fossae, Stygis Fossae and Zephyrus Fossae.

The southeastern portion of the province is geochemically distinct from the northwest. The southeast is composed of sedimentary and porous rocks. The majority of the southeastern portion is made up of Amazonian Hesperian volcanic units. Most of the remaining southeastern volcanic units are late Amazonian in nature. It has been hard to study the composition of this province, due to the layer of dust that sits on top of the crust. Investigations in relatively dust free regions indicate that it is made primarily of high calcium pyroxene and olivine. There are some extant near surface glacial deposits in the caldera of Hecates Tholus, a volcano in the province.

The southeastern portion of the province is approximately 0.85 billion years younger than the northwestern. Crater counting done on the lava flows in the southern region show low cratering rates, which would indicate younger volcanic activity, as recent as 10 Myr. The most recent volcanic activity dates to 2 million years ago. Hecates Tholus erupted ~350 million years ago, with glacial deposits in the resulting caldera dating between 5 and 24 million years ago The three major volcanoes of the region sit on top of a 1700 x 2400 km broad dome. Elysium Mons is approximately 1.5 times as steep as any other Martian volcano at approximately 7 7.5°. The caldera at the summit of Elysium Mons is approximately 13.5 km in diameter. Extending past the rim of this central caldera are at least 18 sinuous channels thought to be the remnants of collapsed lava tubes and lava channels. The Viking orbiter noted that volcanic province of Elysium experienced more diverse types of volcanism than the Tharsis volcanic region. In 2004, ESA's Mars Express orbiter's HRSC observed the volcanoes in the region. The main science goals of the lander are to monitor the level of seismic activity occurring on Mars and to understand how Mars formed and how the planet has been evolving ever since.