Physical experiments of vertical transpression with localized nonvertical extrusion

Dyanna M. Czeck, Peter J. Hudleston

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Previously proposed models of vertical-walled transpression implicitly assume that material extrudes upwards during deformation. This assumption is not necessarily valid at all scales given that: (a) in areas of diverse lithologies, local zones of relatively rigid materials may cause extruding material to deflect around those zones, and (b) ductile strain often forms anastomosing geometries of shear zones. Therefore, it is possible that a local extension direction in otherwise classic transpression may be nonvertical for rocks deforming at depth. Using an analogue experiment, we have modeled a transpression zone with localized nonvertical extrusion. This extrusion is accomplished by the addition of a side 'leak' that allows sideways extrusion in addition to vertical extrusion. The net extension direction depends on the material's position within the deforming zone, resulting in a significant range of lineation orientations with deformation. The strain patterns produced by transpression with localized nonvertical extrusion may explain the wide array of lineation orientations found in some natural ductile transpression zones.

Original languageEnglish (US)
Pages (from-to)573-581
Number of pages9
JournalJournal of Structural Geology
Volume26
Issue number3
DOIs
StatePublished - Mar 2004

Bibliographical note

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • Nonvertical extrusion
  • Sideways extrusion
  • Vertical transpression

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