Data from: Experimental analysis of organ decay and pH gradients within a carcass and the implications for phosphatization of soft tissues ...

• Main Authors: Clements, Thomas, Purnell, Mark, Gabbott, Sarah
• Format: Dataset
• Language: English
• Published: Dryad 2022
• Subjects: phosphatization; soft-tissue fossil; fossilisation; FOS Earth and related environmental sciences; Carbonic acid
• Online Access: https://dx.doi.org/10.5061/dryad.k6djh9w8n; https://datadryad.org/stash/dataset/doi:10.5061/dryad.k6djh9w8n

Replacement of soft-tissues by calcium phosphate yields spectacular fossils. Decay experiments have shown that pH is a major control on the precipitation of calcium phosphate and tissue replication: for this to occur pH must fall below the carbonic acid dissociation constant (pH 6.38). However, in the fossil record, phosphatisation is highly selective - some internal organs, such as muscles, stomachs, and intestines, appear to preferentially phosphatise while other organs seldomly phosphatise. The reasons for this are unclear but one hypothesis is that, during decay, organs create distinct chemical microenvironments and only some fall below the critical pH threshold for mineralization to occur. Here, we present a novel investigation using microelectrodes that records fluctuating dynamic spatial and temporal pH gradients inside of organs within a carcass in real time. Our experiments demonstrate that within a decaying carcass, organ-specific microenvironments are not generated. Rather, a pervasive pH ... : The experiment was recorded pH data using Lazar PHR-146XS-7C pH probes (accuracy: ±0.01pH) connected to independently to an electronic 'reader' (JENCO 6230N) and calibrated immediately prior to each experiment. The readers were plugged into a USB super-hub via RS232 cables and then connected to a computer. Data was logged every half hour automatically and transposed in MS Excel. ...