Volcanism on Mars

Volcanism on Mars

Amazonian The youngest of the geologic epochs on Mars identified through geoiogic mapping of superposition relations, and the area! density of impact craters. caldera An irregular collapse feature formed over the evacuated magma chamber within a volcano. central volcano Emplacement of volcanic materials from a centralized source vent rather than along a distributed line of vents, composite volc...

ORIGIN OF ACID FLUIDS ON MARS: IMPACTS vs. VOLCANISM

Explosive Volcanism on Hecates Tholus, Mars' Investigation of Eruption Conditions

Evidence is presented supporting the identification of a discrete, well-preserved air fall deposit generated by explosive volcanism on Mars. The deposit is located immediately to the west of the summit caldera of Hecates Tholus (32øN, 209øW), the northernmost of the three volcanic constructs in the Elysium Planitia region. The absence of superposed impact craters larger than the resolution limi...

Episodic warming of early Mars by punctuated volcanism

The widespread evidence for liquid water on the surface of early Mars is di cult to reconcile with a dimmer early Sun. Many geomorphological features suggestive of aqueous activity, such as valley networks and open-basin lakes, date to approximately 3.7 billion years ago1–5, coincident with a period of high volcanic activity5,6. This suggests that volcanic emissions of greenhouse gases could ha...

Ancient volcanism and its implication for thermal evolution of Mars