The geologic history of Apollinaris Mons, Mars
Krysak, Daniel J.
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Apollinaris Mons (AM), Mars (174.3°E, 8.5°S), is a low-lying, central-vent volcano located near the boundary between the northern lowlands and the southern highlands, and ∼200 km north of Gusev crater. It has a fan-shaped deposit that emanates from a single channel that breaches the caldera complex, and extends ∼150 km from the summit. I present a geologic map of AM created using the Thermal Emission Imaging System (THEMIS) IR/Visible, and Context Camera (CTX) data within ArcGIS. Results of this study show that AM's summit caldera complex has a more complicated history than previously mapped. Deposits generated from effusive as well as explosive eruptions are found within the summit caldera complex, as are arcuate grabens, troughs, and scarps. Analyses of channel morphology suggests that the fan-shaped deposit is not composed of lava flows but is more likely made of pyroclastic or volcaniclastic materials. AM's volcanic activity spanned the Late Noachian to the Early Amazonian based on crater-size frequency distributions. Importantly, there is no evidence to link the deposits found in the floor of Gusev crater with AM.