| 40Argon |
|
|
|
|
| But K/U?? |
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| 50-200 pmol/g |
|||
| Another K-rich |
|||
| reservoir? |
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|
|
|
|
|
| Produced in the
Earth 940 pmol/g |
||||
| Atmosphere 44% |
||||
| Crust 3.5% |
||||
| Upper mantle .9 %
(25 pmol/g) |
||||
| Lower mantle 52 %
(720 pmol/g) |
||||
| From Davies |