Mireille,
The Sr isotope ratios of the different regions may well be significantly
different.  A university geology library should have geological maps that
would tell you the type and age of rocks in these areas.  I imagine you
already know the basics- young, Rb-poor rocks will tend to have low ratios,
older and/or Rb-rich rocks tend to have higher ratios.

One thing to be cautious about:  The 87/86 ratio of the soil, taken as a
whole, will not tell you the 87/86 ratio of the Sr taken up by the vines.
Various soil minerals will have varying ratios and sometimes one of them
with, for example, a low 87/86 ratio dominates in producing dissolved Sr.

-Tom Johnson




>Dear all,
>
>I am a Ph D student in analytical chemistry and I know very few things in
>geochemistry. I did some measurements of Sr isotope ratio in wine, and I am
>now trying to understand the link with soil.
>Can anybody help me to find value of Sr isotope ratio or maybe nature or
>age of the soil of :
>- Lontue Valley, Chili,
>- San Joaquin Valley, Monterey county, California, USA,
>- Hunter Valley, Victoria, South Eastern, Australia,
>- Western cape, South Africa.
>
>I thank you very much for your answers,
>
>Mireille.
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>LCABIE
>CNRS UMR 5034
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***********************
Thomas M. Johnson
Assistant Professor
Dept. of Geology
University of Illinois at Urbana-Champaign
245 Natural History Bldg. MC-102
1301 W. Green St.
Urbana, IL  61801
(217) 244-2002
FAX (217) 244-4996
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Visit the Hydrogeology Program's web site:
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