cover image: Liberating microfossils from indurated carbonates: comparison of three disaggregation methods - Charlotte Beasley - , Daniel B. Parvaz

20.500.12592/p8xm0h

Liberating microfossils from indurated carbonates: comparison of three disaggregation methods - Charlotte Beasley - , Daniel B. Parvaz

3 Jun 2020

Samples to two more traditional disaggregation foraminifera, ostracods, bryozoans, and were subjected to 10 pulses in the first instance; any methods of Calgon (buffered sodium red and green algae were also observed disaggregated material then falls through a sieve (4–10 mm hexametaphosphate) and acetic acid. [...] EPF S EPF Calgon 10 • The EPF method is highly efficient and effective as a F 5 disaggregation technique for liberating larger microfossils (>500 S µm). [...] 0 25 • EPF indiscriminately disaggregated indurated carbonates with a mixture of calcitic, silicic, and clay matrices/cements; it has 20 also previously been shown to liberate microfossils from Acetic acid Acetic acid Calgon sandstones and shales (Saini-Eidukat and Weiblen, 1996), S S D 15 showing it to be a broadly applicable method to D micropalaeontology. [...] 10 • We suggest that the EPF method could be tailored to effectively 5 liberate smaller (<500 µm) microfossils by using repeated rounds S of processing and progressively smaller sieve aperture sizes, Figure 3: SEM images of select larger foraminifera from samples 0 although further investigation is required. [...] S = sediment remaining attached to Coarse- Fine- Calcite Fine-grained Coarse- • Compared to the traditional methods of disaggregation, foraminiferal test; F = fragmentation of specimen; D = dissolution of grained grained and calcite grained soaking in Calgon and acetic acid, the time required is test surface.
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