Dear Stefano,

I put the same question on this listserver a year ago and I got the
equation

1000ln alpha MAG-H2O=3.36*POWER(10;6)/POWER(T;2)-2.96 (T is temperature in
K)

describing oxygen isotope fractionation between magnesite and water. The
equation was derived by Steele (1998) in his PhD work made somewhere in
England, but the exact reference is unknown.

Greetings

********************************************************
Dr. Vratislav Hurai
Dept. of Isotope Geology
Geological Survey of Slovakia
817 04  Bratislava, Slovakia
tel.: (00421-7)59375140, fax: (00421-7)54771940
----------
> From: Bernasconi, Stefano <[log in to unmask]>
> To: [log in to unmask]
> Subject: magnesite
> Date: 4. október 2000 17:15
>
> Dear all,
>
> Does anybody have any references/suggestions (reaction time,
> phosphoric acid fractionation factor)  on the measurement of C and O
> isotopes in magnesite?
>
> Thank you
> Stefano
>
> -------------------------------
> Dr. Stefano Bernasconi
> Geologisches Institut
> ETH-Zentrum
> CH-8092 Zuerich
> Switzerland
> Tel. ..41-1-632 3693
> fax:  ..41-1-632 1080
> e-mail: [log in to unmask]
> -------------------------------