Please use this identifier to cite or link to this item:
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
Issue Date: Jun-2009
Series/Report no.: 6/37 (2009)
DOI: 10.1130/G25645A.1
Keywords: Fault
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.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
2009_Collettini_et_al_Geology.pdfMain article440.36 kBAdobe PDFView/Open
Show full item record

Page view(s)

checked on Aug 14, 2018


checked on Aug 14, 2018

Google ScholarTM