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Ozone emission during compression fracture of granite. The onset of ozone production coincides with fracture.
Ozone production after grinding for 260 s. During grinding, the chamber is isolated from the detector. Immediately after finishing grindings, time zero, a valve is open to allow the detector to begin pumping chamber gases. The decay of the signal with time is due to pumping at 1 L/m with possible contribution from surface reactions. A dry run with no sample shows no ozone produced above background.
Same as Figure 2 but for rhyolite in different gaseous environments (1 atm). Ozone is produced in oxygen, carbon dioxide, and air.
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