Record Name | Dia_363-0940 |
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Photographer | Unbekannt |
Dating | 11/1993 |
Caption | Title Register of the original deposit: Carbonate rocks: vadose diagenesis. Subaerial exposure produced a corroded fracture karst. Sediments below the mixing zone are saturated with marine pore waters. The geochemical curves are based on results one might obtain from "bulk" analyses. The limestone was originally somposed of coralline algae (A. magnesium-calcite), bivalves and corals (B and C, aragonite). Stabilization is mostly complete in the freshwater phreatic and the offset of the ?13C profile at the water table is due mostly to precipitation of diagenetic calcite cement. A) Paleoexposure Surface - dissolution and fracturing, geopetal vadose sediments, good skeletal preservation. B) Vadose Zone - mostly good preservation through skeletal aragonite is calcitized, minor development of molds and matrix vugs. C) Freshwater Phreatic Zone - extensive dissolution, prolonged flushing, non-fabric selective voids, some calcitization and calcite cement precipitation (black = porosity). D) Mixing Zone - not exposed for meteoric waters, aragonitic fossils may be calcitized, magnesium content of coralline algae high in lower part, dissolution likely in upper part (dilute pore waters). |
Caption (German) | Titel Register der Originalablage: Carbonate rocks: vadose diagenesis. Subaerial exposure produced a corroded fracture karst. Sediments below the mixing zone are saturated with marine pore waters. The geochemical curves are based on results one might obtain from "bulk" analyses. The limestone was originally somposed of coralline algae (A. magnesium-calcite), bivalves and corals (B and C, aragonite). Stabilization is mostly complete in the freshwater phreatic and the offset of the ?13C profile at the water table is due mostly to precipitation of diagenetic calcite cement. A) Paleoexposure Surface - dissolution and fracturing, geopetal vadose sediments, good skeletal preservation. B) Vadose Zone - mostly good preservation through skeletal aragonite is calcitized, minor development of molds and matrix vugs. C) Freshwater Phreatic Zone - extensive dissolution, prolonged flushing, non-fabric selective voids, some calcitization and calcite cement precipitation (black = porosity). D) Mixing Zone - not exposed for meteoric waters, aragonitic fossils may be calcitized, magnesium content of coralline algae high in lower part, dissolution likely in upper part (dilute pore waters). |
Physical description | Fotografie : Diapositiv |
Format | 2,4 x 3,6 cm |
Colour | schwarz/weiss |
Orientation | Hochformat |
Categories |
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License | Creative Commons BY-SA 4.0 |
Copyright notice | ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Unbekannt / Dia_363-0940 / CC BY-SA 4.0 |
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