Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS05] Mars and martian moons

Tue. May 23, 2023 3:30 PM - 5:00 PM Online Poster Zoom Room (1) (Online Poster)

convener:Hideaki Miyamoto(University of Tokyo), Takeshi Imamura(Graduate School of Frontier Sciences, The University of Tokyo), Tomoki Nakamura(Department of Earth and Planetary Materials Sciences, Faculty of Science, Tohoku University), Hidenori Genda(Earth-Life Science Institute, Tokyo Institute of Technology)

On-site poster schedule(2023/5/23 17:15-18:45)

3:30 PM - 5:00 PM

[PPS05-P18] Constraint on paleo hydrological activities from deltas on Mars
Abstract

*Yaowen Luo1 (1.Wuhan University)


Keywords:Mars, deltas, discharge

Deltas record fluvial and sedimentary activities on the early Mars. However, the water activities and sedimentary process related with the formation of the Martian deltas is not well constrained yet.To fill up this gap, we quantitative the fluvial and sedimentary process of seven deltas with various morphologies in different locations on Mars. Paleo discharge, sedimentary rate, timescale and amount of water needed to construct the deltas are estimated. The volume between deltas and carved valleys are compared, and the absolute age of the delta/valley relation is approximated by crater counting. The influence of the variation of Martian obliquity and water supply in rivers and the duration of the paleo water activity is considered. The seven deltas were divided into three types based on their supplying valleys and water source. We assume that the formation of the deltas can be associated with various scenarios, including retreating erosion, groundwater sapping, ice melting, impact events and variations of the Martian obliquity. Based on mass balances the formation timescale of the deltas can range from days to thousands of Martian years. The results suggest that a warm climate is not fundamental requiredfor the formation of the seven deltas we studied.