Dear Gert,

we found such values in the DIC of an anoxic basin of lake Untersee, East 
Antarctica. "The extremely high delta C-13 value (+25.12 permill) of dissolved 
inorganic carbon (DIC) in the anoxylimnion can be attributed to a certain 
pathway of methanogenesis ..."
Ref.: U. Wand et al., Antarctic Science 9, 43-45 (1997)

Best regards
Guenter Schwarz

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        Dr. Günter Schwarz
        Alfred Wegener Institute for 
        Polar and Marine Research
        Research Unit Potsdam
        P.O.Box 60 01 49
        14401 Potsdam, Germany
	
        Tel.: +331 288 2154
        Fax:  +331 288 2137
	
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