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Consult Related URLs below. Therefore, the geometry A of the mineral grain is very important Meesters and Dunai, a, b. These early helium dates had perhaps the greatest intellectual impact of any ages ever measured. Skip to main content Skip to table of contents. Meesters and Dunai a, b generalized the production-diffusion equations to diffusion domains of various shapes and arbitrary cooling histories.

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U-th he dating

The equations presented by Meesters and Dunai a, b and Dunai can be applied to all radiogenic He-bearing minerals. Consistent with this interpretation Wolf et al. The He production and diffusion model assumes a homogenous distribution of U and Th in secular equilibrium and that He is lost only by volume diffusion. They provided independent and quantitative evidence for the great antiquity of rocks, thus establishing a modern framework for understanding Earth history and, of particular importance, Thanks to Ken Farley for the useful comments that helped me clarify several technical points. Use this Persistent URL to link to this item: These early helium dates had perhaps the greatest intellectual impact of any ages ever measured. A Caltech Library Service.

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