Whole-Rock 40Ar/39Ar Step-heating Analyses, Problems and Potential

Patrick Boehnke1, T. Mark Harrison2, Matthew Thomas Heizler3, Oscar M Lovera2 and Paul H Warren4, (1)Eta Vision, Chicago, IL, United States, (2)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (3)New Mexico Institute of Mining and Technology, Bureau of Geology and Mineral Resources, Socorro, NM, United States, (4)University of California Los Angeles, Los Angeles, CA, United States