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Worked Example 7.1 Impact vesiculation
7
Figure 7.13 Page from a fi eld notebook recording observations and ideas that were later tested in the
laboratory. These are good notes but there is no scale to go with the sketches. (Notebook of Janet Sumner,
The Open University, UK.)
In 2002, observations of the vesicle patterns
within basaltic spatter bombs thrown 1 km
during the 1930 eruption of Stromboli led
volcanologists to speculate that some of the
vesicles began to grow as a result of the bombs
hitting the ground (Figure 7.13). The viability of
this process, termed 'impact vesiculation', was
later demonstrated by experiments in the
laboratory that caused bubbles to form in silicate
magma subjected to impact shock.
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