Abstract
The maps of terminations of fault-bend folds, fault-propagation folds and detachment folds formed by hinge migration, limb rotation or a combination of both exhibit some differences. In this work, a set of maps has been constructed for simple structures with constant thickness and kink band geometry, and the main differences that allow diagnosing one or another type of structure have been established. Fundamentally, two criteria have been taken into account: geometric differences and differences in the strain distribution on map view. Fault-bend folds and detachment folds formed solely by limb rotation are easily distinguishable, while fault-propagation folds and detachment folds in which hinge migration intervenes are practically identical.
Highlights
Many types of fold/thrust interaction have been described in the literature, thrust-related folds are usually classified into three main types: fault-bend folds, fault-propagation folds and detachment folds (e.g., Suppe, 1985; Jamison, 1987; Poblet, 2004; Shaw et al, 2005; Nemcok et al, 2009; McClay, 2011; Brandes and Tanner, 2014)
Fault-bend folds and fault-propagation folds are ramp folds because they are related to thrusts in a ramp situation (Fig. 1), whereas detachment folds are related to thrusts in a flat situation (Fig. 2)
Three main kinematic mechanisms have been proposed to account for the amplification of parallel folds: a) folds in which limb dip remains constant and limb length increases through time, so that fold amplifi cation occurs due to hinge migration or kink-band migration (Suppe, 1983); b) folds in which limb length remains constant and limb dip changes through time, and folds amplify by limb rotation (De Sitter, 1956); and c) folds in which both limb length and limb dip vary through time, so that hinge migration together with limb rotation cause fold amplification (Beutner and DiegeI, 1985)
Summary
Many types of fold/thrust interaction have been described in the literature, thrust-related folds are usually classified into three main types: fault-bend folds, fault-propagation folds and detachment folds (e.g., Suppe, 1985; Jamison, 1987; Poblet, 2004; Shaw et al, 2005; Nemcok et al, 2009; McClay, 2011; Brandes and Tanner, 2014). The hinge migration mechanism has been successfully applied to fault bend folds (e.g., Suppe, 1983, 1985) and fault-propagation folds G., Suppe and Medwedeff, 1990) (Fig. 1), mechanisms involving limb rotation have been proposed for fault-propagation folds (e.g., Mitra, 1990). Detachment folds grow by any of the amplifi cation mechanisms mentioned above, i.e., hinge migration, limb rota tion or combination of both mechanisms (e.g., Epard and Groshong, 1995; Homza and Wallace, 1995; Poblet and McClay, 1996) (Fig. 2)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
