Analysis of the internal structure of a carbonate damage zone Implications for the mechanisms of fault breccia formation and fluid flow

作者：Hausegger Stefan; Kurz Walter^*; Rabitsch Robert; Kiechl Eva; Brosch Franz Josef

来源：Journal of Structural Geology, 2010, 32(9): 1349-1362.

DOI：10.1016/j.jsg.2009.04.014

• Fault zone
• Carbonates
• High angle fractures
• Joint bounded slices
• Fault rocks
• Fluid-rock interaction

A segment of the Salzach-Ennstal fault zone (Talhof fault Eastern Alps) shows evidence for joint nucleation by layer-parallel shear causing the formation of joint-bounded slices oriented at high angles (65-85) with respect to the shear zone boundary (SZB) Subsequent slice rotation resulted in joint reactivation as antithetic shears slice kinking and breaking-up of the individual slices into smaller fragments The latter process due to the longitudinal constraint of slices with Impeded shear zone widening marked the transition to cataclasite formation and fault core evolution during shear localization Cataclasites were subsequently cemented and underwent continuous shear deformation by refracturing Cement precipitation from fluids therefore played a fundamental role in the evolution of the fault zone with a cyclic change between an open and a closed permeability system during fault evolution Stable isotope compositions (delta(13)C delta(18)O) of fault rock cements indicate a continuous equilibration between protolith-derived fragments and cements precipitated from those fluids This points to lim

• 出版日期2010-9