The plateau surrounding Mawrth Vallis exhibits some of the strongest, most areally extensive, and most diverse clay spectral signatures on Mars. Similarly extensive clay deposits form on Earth due to surface weathering and soil development in sedimentary sequences, forming paleosols. In a paleosol model, the mineralogy at Mawrth is consistent with soils developed under variable drainage conditions, leading to iron and sulfur redox cycling in surface ponds and at groundwater seeps. These reducing environments may be sites of high organic preservation potential. On Earth, these redox reactions are often microbially mediated, and thus may have provided a source of energy for microorganisms on ancient Mars. Furthermore, the clay mineralogy at Mawrth is consistent with soils developed under persistently temperate, rain-dominated climates. If the Mawrth clays are indeed a paleosol sequence, they may provide an easily accessible and continuous Noachian climate record. The Mawrth Vallis region is currently under consideration as a landing site for both the Mars 2020 rover and future human exploration.
To join using a videoconferencing system:
Please RSVP to Mike Toillion (email@example.com) if you will be joining by Polycom.
To view the slides, connect to http://connect.arc.nasa.gov/uwseminar/
To join using a web browser:
The slides and audio/video for this meeting will be presented using Adobe Connect. To join the meeting, connect to:
If you are having problems connecting, you can try joining http://connect.arc.nasa.gov/uwseminar/?launcher=false, or rebooting your computer, or try joining from another network.