Hi,

My understanding is that Mg/Ca and Sr/Ca concentration ratios have been
used for a water temperature proxy. These are easily measured with
LA-ICP-MS. I don't know any references of this being measured directly from
water samples right now, but I'm sure there's something out there. Maybe
someone else on the list knows of specific references. I could use them too.

Good Luck,

~Penny

At 02:58 PM 2/2/2004 +0000, you wrote:
>Hello,
>
>Thank you very much for you rhelp. Do you know if there are any chemicals
>in the water of seas that could be used with LA-ICPMS
>  to determine water temperatures. Sr maybe? Any help is greatly
>appreciated.
>
>Regards, Tighearnach
> >===== Original Message From Stable Isotope Geochemistry
><[log in to unmask]> =====
> >Hi,
> >
> >I am working on a similar problem right now. I can tell you that it is
> >tricky to get oxygen isotope ratios with LA-ICP-MS. I think it may
> >eventually be done, but the proper ICP equipment does not yet exist (so
>far
> >as I know).
> >
> >One technique that has been tried in the past is LA-GC-IRMS. Read
>papers by
> >Zachary Sharp (University of New Mexico) and Thure Cerling (University
>of
> >Utah) on this technique. Geochimica et Cosmochimica Acta (1996) v.60
>n.15
> >p. 2909-2916 and Palaeogeography, Palaeoclimatology, Palaeoecology
>(1996)
> >v.26 p. 173-186
> >
> >Another technique is IRM-GC-MS published by Alison Jones, Paola
>Iacumin and
> >Edward Young. Chemical Geology (1999) v. 153 p. 241-248.
> >
> >I hope this helps you.
> >
> >~Penny
> >


*************************************************************
                    Dr. Pennilyn Higgins
  Florida Laboratory for Isotopic and Environmental Research
                           "FLIER"

Florida Museum of Natural History       Department of Geology
University of Florida                   University of Florida
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