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Pronounced changes in clay mineral assemblages are preserved along the Moab Fault (Utah). 40% in 1Md illite relative to protolith, whereas altered protolith in the damage zone is enriched ???
40% in illite-smectite relative to gouge and up to ??? These mineralogical changes indicate that clay gouge is formed not solely through mechanical incorporation of protolith, but also through fault-related authigenesis.
Ar-40/Ar-39 muscovite ages from the Gaunt Creek mylonite yielded plateau ages of 1.47 /- 0.08 Ma and 1.57 /- 0.15 Ma.
Finally, we report zircon fission track (0.79 /- 0.11 and 0.81 /- 0.17 Ma) and zircon (U-Th)/He ages (0.35 /- 0.03 and 0.4 /- 0.06 Ma) from Harold Creek.& para;& para; We interpret the fault gouge ages to date growth of newly formed illite during gouge formation at temperatures of similar to 300-350 degrees C towards the base of the seismogenic zone.
The fault gouge age from the Two Thumbs Fault is significantly too old to have formed as part of the late Neogene/Quaternary Southern Alps evolution.
Abstract: Fault-related calcite precipitates taken from different segments along the East Anato-lian (SE Turkey) and Dead Sea (Israel) fault zones were investigated structurally, geochemically and geochronologically.
We interpret the fault gouge ages to date growth of newly formed illite during gouge formation at temperatures of 300-350 °C towards the base of the seismogenic zone.
Simple backcalculation using current uplift/exhumation and convergence rates, and dip angles of 45-60° at the Alpine Fault support that interpretation.
This can contribute to an evaluation of calculated K-Ar ages.
In the Carmel Fault Zone the calcite coating the fault plane precipitated by karst pro-cesses, with no evidence of subsequent deformation.
Calcite fault gouge from the same site are a mix of host-rock gouge and newly formed authigenic calcite, and their overall geochemistry suggests pervasive fluid–rock interaction in the fault zone.
Calcite precipitated in veins at the Har Zefiyya Fault was controlled by near-surface karst processes.
Initial opening of the veins occurred prior to about 500 ka and may represent the onset of an east–west contractional deformation.
The results indicate major differences in the nature of calcite precipitates and temporal relationship to faulting.