Extended Data Fig. 3: Surface features of sodium carbonates and extracted FIB section of C0369-113002.
From: Sodium carbonates on Ryugu as evidence of highly saline water in the outer Solar System
(a, b) BSE image and distribution of sodium on the grain surface. The sodium carbonate vein appears near the edge of the grain. (c) SE image of sodium carbonates from side view. The sodium carbonate vein is indicated by arrows. (d) SE image of the sodium carbonate vein showing a relatively smooth surface compared to the surrounding phyllosilicate matrix. The boundary between the sodium carbonates and the phyllosilicates is indicated by a dashed red line. A FIB section was extracted from a dashed yellow line. (e) SE image of frothy phyllosilicates adjacent to the sodium carbonate vein, indicating space weathering. (f) Annular dark-field (ADF)-scanning transmission electron microscopy (STEM) image of the FIB section. Arrows indicate sodium carbonates. Na-Cb: sodium carbonates; Phy: phyllosilicates; Pt-c: platinum protective coat, Mag: magnetite.
