Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5815
Authors: Collettini, C.* 
Viti, C.* 
Smith, S .A. F* 
Holdsworth, R. E.* 
Title: Development of interconnected talc networks and weakening of continental low-angle normal faults
Journal: Geology 
Series/Report no.: 6/37 (2009)
Publisher: Geological Society of America
Issue Date: Jun-2009
DOI: 10.1130/G25645A.1
Keywords: Fault
Weakening
Low-Angle
Talc
Subject Classification04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones 
Abstract: Fault zones that slip when oriented at large angles to the maximum compressive stress, i.e., weak faults, represent a signifi cant mechanical problem. Here we document fault weakening induced by dissolution of dolomite and subsequent precipitation of calcite + abundant talc along a low-angle normal fault. Within the fault core, talc forms an interconnected foliated network that deforms by frictional sliding along 50–200-nm-thick talc lamellae. The low frictional strength of talc, combined with dissolution-precipitation creep, can explain slip on low-angle normal faults. In addition, the stable sliding behavior of talc is consistent with the absence of strong earthquakes along such structures. The development of phyllosilicates such as talc by fl uid-assisted processes within fault zones cutting Mg-rich carbonate sequences may be widespread, leading to profound and long-term fault weakness.
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