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Earth, Planets and Space
Figure 6 | Earth, Planets and Space

Figure 6

From: Changes in illite crystallinity within an ancient tectonic boundary thrust caused by thermal, mechanical, and hydrothermal effects: an example from the Nobeoka Thrust, southwest Japan

Figure 6

FE-SEM images of ground (a,b) and natural (c-g) clay mineral grain shapes. (a) Starting material of the experimental sample obtained from 35.49 mbgs. (b) The experimental products after 10 min of grinding. Grains are fragmented and comminuted. (c) Clays in phyllite having not experienced mechanical comminution, 3.11 mbgs. (d) Clays in mechanically comminuted phyllite, 39.41 mbgs in the damage zone. (e) Mechanically comminuted grains slightly coated with small authigenic illite showing the lateral growth step, 40.95 mbgs in the damage zone. (f) Comminuted grains completely coated with large crystals of authigenic illite, 41.26 mbgs just above the fault core. (g) The enlarged picture of 41.26 mbgs just above the fault core (Figure 6f).

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