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Termination of a continental-scale strike-slip fault in partially melted crust: The West Pernambuco shear zone, northeast Brazil

1992; Geological Society of America; Volume: 20; Issue: 11 Linguagem: Inglês

10.1130/0091-7613(1992)020 2.3.co;2

1943-2682

Alain Vauchez, Marcos Egydio‐Silva,

Geological formations and processes

Research Article| November 01, 1992 Termination of a continental-scale strike-slip fault in partially melted crust: The West Pernambuco shear zone, northeast Brazil Alain Vauchez; Alain Vauchez 1Laboratoire de Tectonophysique, Université de Montpellier II, 34095 Montpellier Cedex, France Search for other works by this author on: GSW Google Scholar Marcos Egydio da Silva Marcos Egydio da Silva 1Laboratoire de Tectonophysique, Université de Montpellier II, 34095 Montpellier Cedex, France2Instituto de Geociências, Universidade de São Paulo, CP 20899, 01498 São Paulo, SP, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Alain Vauchez 1Laboratoire de Tectonophysique, Université de Montpellier II, 34095 Montpellier Cedex, France Marcos Egydio da Silva 1Laboratoire de Tectonophysique, Université de Montpellier II, 34095 Montpellier Cedex, France2Instituto de Geociências, Universidade de São Paulo, CP 20899, 01498 São Paulo, SP, Brazil Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (11): 1007–1010. https://doi.org/10.1130/0091-7613(1992)020 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 Alain Vauchez, Marcos Egydio da Silva; Termination of a continental-scale strike-slip fault in partially melted crust: The West Pernambuco shear zone, northeast Brazil. Geology 1992;; 20 (11): 1007–1010. doi: https://doi.org/10.1130/0091-7613(1992)020 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 Continental-scale strike-slip faults rooted in the upper mantle have been recently interpreted in deep seismic profiling. These shear zones transect the entire crust, and it may be assumed that the deformation pattern associated with their propagation at different depths was strongly influenced by the rheological properties of the rocks. The continental-scale West Pernambuco shear zone provides information on the deformational behavior of a hot and partially melted crust that has undergone large-scale shearing. This late Precambrian shear zone terminates eastward in a fanlike structure, passing to a wide transpression zone at a high angle to the shear direction. The main fault branches into numerous splay faults over a distance of about 50 km. Severe perturbation of the mylonitic flow pattern commonly occurs at branch points where subsidiary shear zones diverge from the main zone. In these areas, problems of strain compatibility are raised by the sharp bending and decrease in dip of the foliation surface. We propose that this unusual deformation pattern is a result of the low strength of the continental crust at the considered level of observation. 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.