High-Precision In Situ ⁸⁷Sr/⁸⁶Sr Analyses through Microsampling on Solid Samples: Applications to Earth and Life Sciences

Figure 8

Results of micro-Sr isotopes in volcanic ash glasses of the 2010 explosive eruption of Eyjafjallajökull volcano (Iceland). (a) Spectacular image of the ash cloud erupted by the volcano during the early stage of the 2010 activity (https://hiticeland.com/places_and_photos_from_iceland/eyjafjallajokull causing); (b) back-scattered electron microscope images of different clast types sampled in the basal level of the fallout deposit related to the open phase of the 2010 eruption. FL = fluidal; SFV = spongy finely vesicular; CV = coarse vesicular; and BL = blocky. Scale bars are in micron; comparison between back-scattered electron microscope images of clasts before (c) and after (d) in situ microdrilling. Scale bars are in micron; (e) ⁸⁷Sr/⁸⁶Sr versus SiO₂ (wt.%) diagram of matrix glasses sampled from single, glassy ash clasts. In situ microsampling for Sr-isotope determinations on glass and plagioclase have been obtained by microdrilling technique. Error bars are inside the symbols.

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