Abstract
Petrographic investigation using a cathodoluminescent microscope and an electron microprobe for selected dolomite samples from the Beekmantown Group reveals six dolomite textures. These dolomite textures have been classified based on crystal sizes, shapes, uniformity and trace-element distribution. The textures are as follows: 1) unimodal, very finely crystalline, planar-e (euhedral) dolomite, 2) unimodal, very finely crystalline, planar-s (subhedral) dolomite, 3) medium to coarsely crystalline, planar-e (euhedral) dolomite, 4) coarsely crystalline, non-planar dolomite (non-saddle dolomite), 5) very coarsely crystalline, non-planar dolomite (saddle dolomite), and 6) polymodal dolomite.
Petrographic analysis of the selected Beekmantown dolomite samples records a timing sequence of diagenesis as follows: 1) deposition of the original sediments; 2) dolomitization; 3) silicification; 4) chemical compaction (stylolitization); 5) dedolomitization; and 6) precipitation of saddle dolomite (pore-filling dolomite).
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Kolkas, M.M., Friedman, G.M. Diagenetic history and geochemistry of the Beekmantown-Group dolomites (Sauk Sequence) of New York, USA. Carbonates Evaporites 13, 69–85 (1998). https://doi.org/10.1007/BF03175436
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DOI: https://doi.org/10.1007/BF03175436