Fault-Related Controls on Upward Hydrothermal Flow: An Integrated Geological Study of the Têt Fault System, Eastern Pyrénées (France)

Figure 7

Two outcrops of the brittle Têt fault. Red rose diagrams represent fault plane principal strike (to the right of dip direction, explaining the diagram asymmetry) in the multicore zone, whereas green rose diagrams represent fracture strikes in the damage zone. (a) Llo hot spring site. The visible part of the outcrop (continuous line) shows that the Têt fault is a multicore fault of gneiss lenses separated by many fault planes of cataclastic fault rocks. The hot spring emerges in the Têt fault footwall damage zone. Gneiss in the footwall is juxtaposed with metasediments in the hanging wall. (b) Thues-les-Bains hot spring site. In the multicore zone, 30 m wide, many fault plans covered by white mineralizations separate large gneissic lenses from the cataclastic rocks. Highly fractured gneiss constitutes both the hanging wall and the footwall damage zones, where the hot springs emerge.

(a)

(b)