Fig. 2: Major oxide geochemical analysis of ice and marine sediment core tephra shards analyzed that correlate with LCY ash.
From: Ice core evidence for the Los Chocoyos supereruption disputes millennial-scale climate impact
Tephra shards analyzed in ice cores NEEM (red diamonds) and EDC (red squares), and marine sediment core V19-30 (red triangles), that correlate with LCY major and minor element geochemistry. A single LCY-correlating shard found in NEEM ice core ~16 years prior to the later group (n = 3) is indicated by a light-red diamond. All marine sediment and ice-core shards analyzed are compared to proximal terrestrial and lacustrine LCY ash geochemistry measured as part of this study (light blue circles) and previously published data (dark blue circles)20, including tephra fall, ignimbrite, and surge deposits. Error bars shown represent 2σ of replicate analysis of tephra secondary standards (Lipari ID3506 for marine sediment tephra and Old Crow for ice core tephra107), measured during the relevant analysis session under the same conditions. All wt.% totals are normalized to 100%. Details of analytical conditions can be found in the “Methods and materials” section.
