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Figure 2 | Earth, Planets and Space

Figure 2

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 2

Borehole core photos showing deformational features 20 cm each of the hanging wall of the Nobeoka Thrust. Note that the photos are outward appearance of cores before splitting, and inclined planar structures such as faults and fractures are not represented as a straight line. (a) Phyllite with minor brittle deformation, 3.50 to 3.70 mbgs. (b) Moderately deformed brittle damage zone, 39.40 to 39.60 mbgs. (c) Highly deformed damage zone just above the fault core with quartz and calcite veins, 41.10 to 41.30 mbgs. (d) Fault core consisting of random, non-foliated cataclasite including angular to subangular clasts of sandstones, shales, and quartz veins, 41.30 to 41.50 mbgs.

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