Semi-brittle deformation of talc at the base of the seismogenic zone
Grant/Award Number and Agency
Earth Sciences Instrumentation and Facilities (EAR/IF) Earth Sciences Instrumentation and Facilities (EAR/IF)
National Science Foundation (NSF)
With the recognition that the mineral talc is common in the cores of many exhumed faults, it has been suggested that talc may be important to the dynamics and modulation of slip in active fault zones. Talc’s wide stability field allows it to persist both at shallow depths and deep into subduction zones and experimental data suggest that it is also rheologically weak. To understand the behaviour of polycrystalline talc at conditions relevant to a subduction zone environment, we conducted a series of high-strain torsion experiments on natural talc at high pressure (1 GPa) and temperatures (450-500 °C). Scanning Transmission Electron Microscope (STEM) imaging revealed a marked decrease in grain size (long axes reduced from ~3-5 mm to
Charis Horn: https://orcid.org/0000-0001-5024-2508;
Philip Skemer: https://orcid.org/0000-0002-6702-1098
Horn, Charis and Skemer, Philip, "Semi-brittle deformation of talc at the base of the seismogenic zone" (2023). Digital Research Materials (Data & Supplemental files). 103.