Timing and Volcanic Features of the Icaria Fossae Region on Mars:THEMIS Image Analysis

The Icaria Fossae region is located in the southern part of the Tharsis bulge.More than 20 small volcanoes are identified through THEMIS high-resolution image analysis.They are 45-100 km in diameter and are 800-3 000 m high.Crater counting suggests the age of these volcanoes is about 4 Ga,which are the oldest volcanoes found on Mars until now.These volcanoes were strongly modified compared to other regions on Mars.There are many typical geological phenomena in Icaria Fossae region such as impact craters,lava flows,fluvial valleys,etc.The study of this area can help the understanding of the evolution of volcanic geological events and other related geological events on Mars.