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Empirical paths of poles to planes (eppps) constrain the kinematics of geological shear zones
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2014 (English)In: Journal of Structural Geology, ISSN 0191-8141, E-ISSN 1873-1201, Vol. 66, 309-333 p.Article in journal (Refereed) Published
Abstract [en]

Ductile shear zones are tabular bodies of deformed rocks bound by less deformed wall rocks. This work introduces a simple empirical approach to analysing the 3D kinematics of shear zones. The orientations of pre-shear planar markers distorted across natural shear zones by local strains are systematically measured and plotted as poles on lower hemisphere equal area projections that constrain smooth empirical paths of poles to planes (eppps). Such eppps recording local strain gradients are used to fix a reference frame to the plane of greatest shear in any homogeneous bulk strain. Assuming that space can be taken as a proxy for time, the curvatures of pre-shear planar markers across shear zones are interpreted as the records of the 3D bulk strain histories of shear zones. The sig- or zig-moidal symmetries of sheared markers record different amounts of the same general strain within the same overall movement pattern (i.e. in a constant flow field) whatever its geometry or history. In effect eppps represent the strain memories of shear zones with successively inward readings recording successively younger shearing. In planes other than the bulk XY, great circle eppps indicate simple shear while hyperbolic eppps indicate pure shear. Eppps for suites of shear zones in Proterozoic gneisses in Sweden exhibit the parabolic shapes indicative of pure rather than simple shear.

Place, publisher, year, edition, pages
2014. Vol. 66, 309-333 p.
Keyword [en]
Shear zones, Structural movement paths, Empirical paths of poles to planes (eppps), Shear memory
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-232584DOI: 10.1016/j.jsg.2014.05.007ISI: 000340978000021OAI: oai:DiVA.org:uu-232584DiVA: diva2:749570
Available from: 2014-09-24 Created: 2014-09-22 Last updated: 2017-12-05Bibliographically approved

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Talbot, Christopher J.

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