Palaeogene glendonites from Denmark

Schulz, Bo Pagh, Vickers, Madeleine Larissa, Huggett, Jennifer, Madsen, Henrik, Heilmann-Clausen, Claus, Friis, Henrik and Suess, Erwin (2020) Palaeogene glendonites from Denmark Bulletin of the Geological Society of Denmark, 68 . pp. 23-35. DOI 10.37570/bgsd-2020-68-03.

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Pristinely preserved mineral pseudomorphs called glendonites, up to 1.6 m long, from the Palaeogene strata of Denmark allow detailed crystallographic characterisation and add to the understanding of the transformation of the precursor mineral, ikaite (CaCO3 center dot 6H(2)O), to calcite, which constitutes the glendonite. We describe Danish pseudomorphs after ikaite from two localities and formations: the Early Eocene Fur Formation and the Late Oligocene Brejning Formation. This detailed study highlights that key aspects such as morphology and mode of occurrence of these ancient glendonites are identical to those of their parent mineral ikaite, when it grows in marine sediments. Systematic distortion of the angles in glendonite and marine sedimentary ikaite relative to the ideal ikaite symmetry may arise due to the incorporation of organic matter into the crystal structure, and we demonstrate the similarity between modern and ancient ikaite formation zones in the marine sedimentary realm with respect to organic matter.

Document Type: Article
Keywords: Glendonite; ikaite; morphology; distorted symmetry; Fur Formation; Brejning Formation
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.37570/bgsd-2020-68-03
ISSN: 2245-7070
Date Deposited: 16 Apr 2020 07:43
Last Modified: 16 Apr 2020 07:43

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