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Palaeoclimatic record based on the irregular echinoid tests

To analyse the Irregularia tests composition the calcite crystal fragments were prepared by fracturing and carbon coating. Samples were analysed by Energy Dispersive Spectrometer (EDS) coupled with Scanning Electron Microscope (SEM) Tescan VEGA to obtain chemical composition, especially magnesium content in Mg-calcite tests. The aim of this research is to determine whether the weight percent of magnesium in the tests can be used as the indicator of the sea water temperature. The enhanced magnesium content should correspond to higher, and decreased to the lower sea temperatures (PILKEY & HOWER, 1960). Stable isotope analyses (18O/16O) are planned in order to verify these preliminary conclusions.

Cenozoic; Palaeoclimate; Echinoidea; Irregularia; Magnesium; SEM

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