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Dating Applications (Coast Plutonic Complex, Alaska (ZHe & AFT (Age…

- - - - Hanging wall - more recently passed through PRZ
      - --> as its displaced upward
- - - - Passed through PAZ & PRZ
        ∴ retained both FT & He age info
    - - Sample age ↓ (younging for both FT & He)
      - Indicates moving through PRZ then PAZ as depth ↑
      - eventually incredibly young samples
- - - - PRZ for He would be ~60-45°C
      - Z ~ 1.5 km assuming geothermal gradient 30°C/km
    - - Cannot tell from He elevation data alone
      - If no signal AFT, then may be PRZ