Palaeogene glendonites from Denmark

Bo Pagh Schulz, Madeleine L. Vickers, Jennifer Huggett, Henrik Madsen, Claus Heilmann-Clausen, Henrik Friis, Erwin Suess

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Abstract

Pristinely preserved mineral pseudomorphs called glendonites, up to 1.6 m long, from the Palaeogene strata of Denmark allow detailed crystallographic characteri-sation and add to the understanding of the transformation of the precursor min-eral, ikaite (CaCO3·6H2O), 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.

OriginalsprogEngelsk
TidsskriftBulletin of the Geological Society of Denmark
Vol/bind68
Sider (fra-til)23-35
Antal sider13
ISSN0011-6297
DOI
StatusUdgivet - 2020

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