Evolution of rift basins and low-angle detachments in multilayer analog models

Abstract

Research Article| July 01, 1997 Evolution of rift basins and low-angle detachments in multilayer analog models A. P. Gartrell A. P. Gartrell 1Tectonics Special Research Centre, Department of Geology and Geophysics, University of Western Australia, Nedlands, Western Australia 6907, Australia Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (7): 615–618. https://doi.org/10.1130/0091-7613(1997)025<0615:EORBAL>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A. P. Gartrell; Evolution of rift basins and low-angle detachments in multilayer analog models. Geology 1997;; 25 (7): 615–618. doi: https://doi.org/10.1130/0091-7613(1997)025<0615:EORBAL>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Multilayer analog models comprising a brittle upper layer (sand and clay), a strong ductile middle layer (high-viscosity silicone putty), and a weak ductile basal-layer (low-viscosity silicone putty) are used to demonstrate the importance of lithospheric strength maxima in the development of rift basins and low-angle detachments. Although a wide range of rift geometries formed, a general evolution can be derived from the experimental results. An initial period of distributed extension is followed by localized deformation into rift basins due to boudinage of the strong layer. Delamination at the interface between the strong putty and weak putty layers results in the formation of subhorizontal ductile shear zones below the strong ductile layer. This basal shear zone alters the symmetry of the boudins and sets up a stress regime mechanically suitable for the growth of low-angle normal faults in the neck lines of developing rift basins. Continued boudinage eventually tears the strong ductile layer. The brittle upper layer is subsequently dragged over the basal ductile layer along a series of listric detachment faults. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.