Fig. 4: In situ sulfide compositional data obtained via electron probe microanalyzer for each sample, superimposed on at% Fe-Ni + Co-S phase diagrams.
From: Hydrothermal alteration of Ryugu from a disruptive impact recorded in a returned sample
a, b A0016 and c, d A0094-01 and C0103-01. Phase diagrams at a 230 °C, b 400 °C, c 25 °C, and d 100–135 °C. Sulfides in A0016 are consistent with equilibrating between 230 and 400 °C, while A0094 and C0103 are consistent with equilibrating below 100–135 °C, potentially as low as 25 °C. Here po = pyrrhotite, pn = pentlandite, py = pyrite, mss = monosulfide solid solution, hz = heazlewoodite (Ni3S2), vs = vaesite (NiS2), viol = violarite (FeNi2S4), α = kamacite, and γ = taenite. Phase diagrams in a, b are adapted from58, with original data for 230 °C from59 and 400 °C from60. The 25 °C diagram is adapted from61. The 100 to 135 °C phase diagram is adapted from62.
