Stable isotope study of carbonate-cemented rocks from the Pobitite Kamani area, north-eastern Bulgaria
✍ Scribed by R. W. Botz; V. Georgiev; P. Stoffers; Kh. Khrischev; V. Kostadinov
- Book ID
- 104657609
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 877 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0016-7835
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✦ Synopsis
The Precipitation of carbonate cements in the Pobitite Kamani area (Lower Eocene) began during early diagenesis of sediments. There is evidence, however, that calcite is still forming today.
The negative 613C values to -29.2%0 suggest that the carbonate formed during degradation of ~2C-enriched organic matter (perhaps partly from oxidation of methane). The 6 ~ 80 values of -0.9 to -1.6%o reflect the marine origin of the early diagenetic carbonate cements. Most of the carbonates, however, formed during late diagenesis (at approximately 1 300 m burial depth) and/or recently (after uplift) from percolating groundwaters. These carbonates have an isotopic composition characteristic of carbonates which precipitated from meteoric waters under normal sedimentary temperatures in isotopic equilibrium with ~2C-enriched soil carbon dioxide.