From Radiogenic Source or Sink? — Simple and Complex 4He Outgassing Behaviors and Diffusion Systematics Observed During Continuous Ramped Heating of Apatite

We performed continuous ramped heating (CRH) on apatites from various tectonic settings and found two major types of 4He outgassing behavior. Apatites with good (U–Th)/He age reproducibility show s...