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Stable carbon isotopes of graphite from Bogala Mine,Sri Lanka

Authors:	Albert Dobner Wolfgang Graf Paula Hahn-Weinheimer Alfred Hirner

Institution:	1. Bayerisches Geologisches Landesamt, Prinzregentenstr. 28, 8000 München 22, Germany;2. Forschungsstelle für Geochemie der Technischen Universität München, Arcisstr. 21, 8000 München 2, Germany

Abstract:	The ratios of the carbon isotopes ¹³C and ¹²C of twenty-four graphite samples from Bogala Mine, Sri Lanka have been determined. The graphites are isotopically very similar (mean value $?7.76? °^{13} C_{PDB}$ ; range $<2?$ ). Three models for the biogenic or abiogenic origin of the graphite deposit are discussed.

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