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. 2020 May 29;6(22):eaaz3053. doi: 10.1126/sciadv.aaz3053

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A to K) Hand specimen (C and J), optical microscopic (B, E, I, and K), and backscattered electron images (A, D, F, G, and H) of hydrothermal alteration minerals in the Chicxulub peak ring, presented in order of increasing depth. (A) Domain of euhedral FeS₂, either pyrite (Py), and/or the alternative dimorphic structure marcasite (Mrc), in suevite sample 0077A-40R-2, 105 to 107 cm (619 mbsf). (B) Impact glass fragment altered to montmorillonite-like sheet silicate in suevite sample 0077A-41R-1, 58 to 60 cm (638 mbsf). (C) Red Na-dachiardite (Dac) and transparent analcime (Anl) in suevite sample 0077A-60R-1, 90 to 92 cm (678 mbsf). (D) Framboidal pyrite (Py) associated with zeolite (analcime and Na-dachiardite) in suevite sample 0077A-63R-2, 69.5 to 72 cm (685 mbsf). (E) Sheaf-like barite (Brt) associated with zeolite (heulandite; Heu), smectite, and calcite (Cal) in suevite sample 0077A-71R-1, 55.5 to 57 cm (697 mbsf). (F) Secondary magnetite (Mag) surrounding a clay-lined vesicle filled with calcite in impact melt rock sample 0077A-85R-1, 26 to 28 cm (717 mbsf). (G) Zoned euhedral andradite-grossular garnet (Grt) crystals in mafic sheet silicate alteration domain, impact melt breccia sample 0077A-89R-3, 39 to 43 cm (729 mbsf). (H) Vein of albite (Ab) and K-feldspar (Kfs) crosscutting shocked basement granitoid sample 0077A-150R-3, 25.5 to 27 cm (887 mbsf). (I) Green epidote (Ep) vein crosscutting shocked granitoid sample 0077A-155R-1, 12 to 14 cm (897 mbsf). (J) Euhedral analcime crystal along open fracture in impact melt breccia sample 007A-293R-1, 10 to 12 cm (1301 mbsf). (K) Euhedral andradite garnet crystals in postimpact calcite (Cal) vein, impact melt breccia sample 0077A-299R-2, 10 to 12.5 cm (1321 mbsf). Photo credit for (C) and (J): M.S., LPI.