2.6. Mineralogical analyses.
Samples for mineralogical analysis were taken from the middle of the
sediments (where numerous carcasses were buried), or from the red layer
(see below) in the case of montmorillonite. Sediment samples were
investigated by Simultaneous Thermal Analysis (STA) that combines
differential scanning calorimetry (DCA) and thermogravimetry (TG).
TG/DCA curves were recorded with the STA equipment (NETZSCH STA 449 F3
Jupiter®) at a heating rate of 10°C/min at room atmosphere. Mineral
transformations caused by organic decay in kaolinite and clinochlore
were described earlier (Naimark et al., 2018a, b). Here we report the
transformations in montmorillonite and chamosite in comparison with
correspondent controls without nauplii.