<p>A lunar apatite sample has a relatively low OH content of 5 ppm, but a an elevated D of 11,000‰ (vs. SMOW). Assuming that water had an original figure of around -100‰ or so, how do I estimate the amount of water present before degassing?</p>

CC BY-SA 4.0
2022-08-23T15:05:50.890Z
It would be easier with the oxygen-18 signature
Weiss
CC BY-SA 4.0
2022-08-23T18:21:06.407Z
What's the prior work you have put into this? We're not here to solve your homework problems.
AtmosphericPrisonEscape
<geochemistry><planetary-science><moon><isotopic>
Calculate original volatile content of a degassed mineral
Andy
# Calculate original volatile content of a degassed mineral

(Asked by: username_0 on 2022-08-20)

A lunar apatite sample has a relatively low OH content of 5 ppm, but a an elevated D of 11,000‰ (vs. SMOW). Assuming that water had an original figure of around -100‰ or so, how do I estimate the amount of water present before degassing?

**Tags:** geochemistry, planetary-science, moon, isotopic

> **Comments:**
> **username_1**: It would be easier with the oxygen-18 signature  
> **username_2**: What's the prior work you have put into this? We're not here to solve your homework problems.  

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## 0 answers

