Fig. 2 | Nature Communications

Fig. 2

From: Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Fig. 2

New and published δ18O values vs. SiO2 contents in moldavites and sediments from the Ries area. The wider range in δ18O values of moldavites from this study is due to analyzing chemically more variable specimens29 compared to those analyzed earlier41, 51. Silica contents in some earlier analyzed moldavites51 were reported elsewhere83. Available combined SiO2–δ18O data for chemically diverse Ries area sediments41 are plotted. Clays and marly sands can represent only a small proportion of parental material to moldavites while SiO2-rich sands dominate the budget4, 13, 41. The consistent δ18O offset of ~3–5‰ between moldavites and possible parental sediments from Ries area appears to be a combination of several aspects, explored in detail in the main text. The maximum 2 s.d. error bars for δ18O (±0.4‰) and SiO2 (±2%) are plotted

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