Abiotic CH4 flux from the Precambrian Shield on Earth and during the Noachian, Hesperian, and Amazonian periods on Mars

Jesse Dylan Tarnas1, John F Mustard1, Barbara Sherwood Lollar2, Oliver Warr2, Kevin Cannon3, Ashley Margaret Palumbo3, Ana-Catalina Plesa4 and Michael Bramble3, (1)Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (2)University of Toronto, Department of Earth Sciences, Toronto, ON, Canada, (3)Brown University, Providence, RI, United States, (4)German Aerospace Center DLR Berlin, Berlin, Germany