Identifying the Sources of Methane in Shallow Groundwaters in Parker and Hood Counties, Texas through Noble Gas Signatures

M. Clara Castro1, Tao Wen1, Jean-Philippe Nicot2, Chris M Hall3, Patrick John Mickler4 and Roxana Darvari5, (1)University of Michigan, Department of Earth and Environmental Sciences, Ann Arbor, MI, United States, (2)University of Texas at Austin, Bureau of Economic Geology, Jackson School of Geosciences, Austin, United States, (3)University of Michigan Ann Arbor, Department of Earth and Environmental Sciences, Ann Arbor, MI, United States, (4)University of Texas at Austin, Austin, TX, United States, (5)University of Texas at Austin, Bureau of Economic Geology, Jackson School of Geosciences, Austin, TX, United States