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A lunar apatite sample has a relatively low OH content of 5 ppm, but a an elevated D𝛿 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?

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  • $\begingroup$ It would be easier with the oxygen-18 signature $\endgroup$
    – Weiss
    Aug 23, 2022 at 15:05
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    $\begingroup$ What's the prior work you have put into this? We're not here to solve your homework problems. $\endgroup$ Aug 23, 2022 at 18:21

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