Spatially Resolved Synchrotron X-ray Tomography and Diffraction of Cryogenic Natron and Fluid Inclusions in a Frozen Na-Cl-CO3 Solution

This dataset contains full-field reconstructed synchrotron X-ray computed microtomography (µCT) and spatially resolved X-ray diffraction (XRD) data of a frozen Na-Cl-CO3 solution. The data reveals the microstructure of the ice, the presence of cryogenic natron Na-Cl-CO3, and the entrapment of primary fluid inclusions within the salt crystals. Sample Preparation: An aqueous solution of 1.0 m NaCl and 0.5 m Na2CO3 was loaded into a 1 mm Kapton capillary. The sample was cooled from 268 K to 205 K at a rate of 6 K/min. Data Collection (K11-DIAD, Diamond Light Source): Tomography (43992.tiff): 1005 projections collected over 180 degrees at 20 keV with a 0.1 s exposure (PCO Edge 5.5). The detector was binned 2x, resulting in a pixel resolution of 2.16 µm. Reconstructed using ASTRA-Toolbox/SAVU. Diffraction (k11-43994_processed.nxs): A 10x10 spatially correlated grid scan using a 25 x 25 µm micro-focused beam (20 keV) collected on a Pilatus 2M (15 s exposure). This data supports the findings in the manuscript "Fluid inclusions in natron - a window into the interior of Enceladus".