Figure 4 | Scientific Reports

Figure 4

From: Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes

Figure 4

Thin-section photomicrographs of glendonite and associated sediment; (a) core of glendonite displaying the prismatic chevron-like habit of stellate pseudomorphs, Koporye Formation of St Petersburg region (petrographic microscope, plane light); (b) glendonite showing mosaics of microgranular calcite after recrystallization of original ikaite (petrographic microscope, parallel light), Türisalu Formation, North Estonia; (c) cathodoluminescence image of previous picture showing zoned ovoidal calcite grains with red-CL colours surrounded by subsequent orange-CL overgrowths; (d) SEM image showing euhedral crystals of pyrite nucleated on external wall of a phosphatic linguliform brachiopod, Koporiye Formation of St Petersburg region.

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