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Fig. 3 Micro-Raman analyses of another amygdaloidal silica micrograin in the breccia matrix. Micro-Raman analyses of another amygdaloidal silica micrograin.

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Presentation on theme: "Fig. 3 Micro-Raman analyses of another amygdaloidal silica micrograin in the breccia matrix. Micro-Raman analyses of another amygdaloidal silica micrograin."— Presentation transcript:

1 Fig. 3 Micro-Raman analyses of another amygdaloidal silica micrograin in the breccia matrix.
Micro-Raman analyses of another amygdaloidal silica micrograin in the breccia matrix. (A) High-magnification BSE image of another amygdaloidal silica micrograin (no. 2) in the breccia matrix of NWA 2727 far from the shock veins. White crosses and white boxes indicate the analytical points of Raman spectroscopy (areas 1 to 3) and the mapping areas, respectively. (B) Raman spectra of the different areas of the silica micrograin in (A). Raman intensities of the moganite bands increase, whereas those of the quartz bands decrease. The most intense coesite bands are detected together with moganite signatures in the rim of the silica micrograin (area 1). (C to E) Raman intensity maps of the moganite (502 cm−1) (C), coesite (521 cm−1) (D), and quartz (464 cm−1) (E) bands for the silica micrograin. Red and blue denote the high- and low-relative Raman intensities of each silica band, respectively. Moganite is abundant in the right and lower left of the silica micrograin, being present with coesite in the outermost rim of these parts. In contrast, quartz is located in the upper left, and its distribution is opposite to those of moganite and coesite. 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).

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