Extended Data Fig. 4: The Vedde ash in core GS07-148-17GC.
From: Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago
a, Bivariate plot of FeO* vs K2O showing the results from all the data presented in the Supplementary data File 1. All data are normalized to a 100% total on a water and volatile-free basis for data set comparison (the Supplementary Data File 1 contains the original non-normalized geochemical data). Total iron is expressed as FeO*. Compositional envelopes (dash lines) show the rhyolitic and basaltic-intermediate components of the Vedde Ash (from Tephrabase: www.tephrabase.org153). b, Scanning electron microscope images of glass shards from interval 32.5-33.0 cm depth in core GS07-148-17GC (B: basaltic glass, R: rhyolitic glass).
