Fig. 4 Micro-Raman analyses of high-pressure SiO2 phases.

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Presentation transcript:

Fig. 4 Micro-Raman analyses of high-pressure SiO2 phases. Micro-Raman analyses of high-pressure SiO2 phases. (A) High-magnification BSE image of an amygdaloidal silica micrograin (no. 3) within a shock vein. Tweed-like textures occur in the rim of this micrograin (lower right). White crosses and white boxes indicate the analytical points for Raman spectroscopy (areas 1 and 2) and the mapping areas, respectively. (B) Raman spectra of the silica micrograin in areas with and without the tweed-like textures. Only moganite and high-pressure silica glass signatures are detected in the area without the tweed-like textures (area 1). In contrast, stishovite and coesite signals become dominant in the tweed-textured rim (area 2). (C to F) Raman intensity maps of the stishovite (753 cm−1) (C), coesite (521 cm−1) (D), moganite (502 cm−1) (E), and shock-induced silica glass (602 cm−1) (F) bands. The relative Raman intensities are represented by color variations from red (high) to blue (low). Abundant stishovite coexists with coesite in the tweed-like textural rim (lower right). In contrast, moganite and shock-induced silica glass are quite depleted in the rim and enriched in the interior without the tweed-like texture. Masahiro Kayama et al. Sci Adv 2018;4:eaar4378 Copyright © 2018 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).