Using Noble Gas Isotope and Abundance Information to Place Constraints on Basinal Fluid Origin, Relative Timing, Transport Mode and Mass Balance: He-N2 Rich Gases in the Mid-Continental USA
C. J. Ballentine and B. S. Lollar
Department of Geological Sciences, The University of Michigan, Ann Arbor, MI 48109-1063, USA
Dept. Geology, The University of Toronto, Ontario M5S 3B1, Canada