ISSN:
1437-3262
Schlagwort(e):
Stable isotopes
;
Carbonate cements
;
Pobitite Kamani, Bulgaria
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Geologie und Paläontologie
Notizen:
Abstract 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 δ13C values to −29.2‰ suggest that the carbonate formed during degradation of 12C-enriched organic matter (perhaps partly from oxidation of methane). The δ18O values of −0.9 to −1.6‰ reflect the marine origin of the early diagenetic carbonate cements. Most of the carbonates, however, formed during late diagenesis (at approximately 1300 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 12C-enriched soil carbon dioxide.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00191493
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