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Hay Hay,
I'm Jens and I'm new in the Isogechem list and of course I have a question.
I'm working on carbonat preciptates induced by gashydrate decomposition
in the accretionary prism of Oregon (for my PhD). I found high-MgCc
together with
aragonite cementing the sediment. To see the influence of the hydrate water I
corrected the 18O data of MgCc for the Mg-content (Tarutani)
but I can't use the factor 0.6 for Aragonite, because the temperature in 780m
waterdepth was 4°C (and not 25°C).
What I'm looking for now is a equation for the fractionation of 18O which
depends on the
temperature and the d18O of the source water. I know the equation from
Grossman and Ku (1981),
but I can't believe that the fractionation for benthic foraminifers and for
anorganic aragonite precipitaion is the same.
So, is there anybody in the world who can tell me how anorganic aragonit
fractionates oxygen isotopes.
Cheers JENS
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Jens Greinert
GEOMAR
Forschungszentrum fuer marine Geowissenschaften
Abt. Marine Umweltgeologie
Wischhofstr. 1-3
24148 Kiel, Germany
phone: ++49 431 600 2114
fax: ++49 431 600 2928
email: [log in to unmask]
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