Computer Science
Scientific paper
Aug 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..755t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 8, pp.755-767
Computer Science
3
Scientific paper
The dolomites studied formed during earliest diagenesis in shallow lagoonal environment. In co-existing pairs, O 18 is enriched in dolomite relative to calcite by 0.6-10.1 per mil. From estimates of the isotopic composition of the depositional waters we conclude that one group of dolomites, at least, was precipitated with an oxygen fractionation factor similar to that of calcite. Once formed, dolomite was resistant to subsequent alteration, but calcite exchanged oxygen with groundwaters during diagenesis and, in the Strathaird district of Skye, during a Tertiary heating episode. This explains the range of values of O 18 dol-cal observed. C 13 dol-cal is generally small and positive, but some dolomites are C 13 depleted by 7-10 per mil. These incorporated carbon from the decay of organic matter. C 13 values were resistant to subsequent alteration.
Hudson Douglas J.
Tan Francis C.
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