Microforaminiferal linings as proxies for paleosalinity and pollution: Danube Delta example

Research on microforaminiferal linings from the Danube Delta reveals that these organic linings can serve as reliable proxies for paleosalinity and pollution, despite their low abundance compared to high-salinity environments. The study demonstrates a qualitative model linking benthic foraminifera and their linings across environmental gradients, from delta plain (-1.8 m water depth) to continental slope (>90 m), with surface salinity ranging from 5 to 17 psu. Using cold acid-treated samples, the authors describe the relationship between test ornamentation (e.g., papillate and granulate surfaces) and low-oxygen survival strategies in the Black Sea's eutrophic environment. A Dissolution Index based on organic lining-to-test ratios indicates poor calcite preservation, while deformities, large pore sizes, and pyritization suggest hypoxia and eutrophication. This baseline data enhances understanding of coastline changes and marine transgressions in Paratethyan basins.

Mudie, P. J., & Yanko-Hombach, V. (2019). Microforaminiferal linings as proxies for paleosalinity and pollution: Danube Delta example. Micropaleontology, 65(1), 27–45. https://doi.org/10.47894/mpal.65.1.02