Recording and analyzing geospatially accurate structural data through ‘digital mapping’ technique: A case study from the Canisp Shear Zone,NW Scotland |
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Authors: | A Chattopadhyay R E Holdsworth K J W McCaffrey R W Wilson |
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Institution: | 1.Department of Geology,University of Delhi,Delhi,India;2.Department of Earth Science,Durham University,Durham,UK |
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Abstract: | Spatial accuracy of structural data is an important factor for construction of a properly scaled model of crustal structures.
Digital Geological Mapping methods can add the required spatial accuracy to the data, and also can improve the versatility
of the geological/structural map in many ways, which are difficult to achieve through conventional mapping techniques. The
present paper describes the methodology of digital mapping and discusses its applicability in structural analyses in the Canisp
Shear Zone (CSZ) — a reactivated continental basement structure in the Precambrian Lewisian Gneiss complex of NW Scottish
Highland. The CSZ is reinterpreted as a major dextral transpressional shear zone developed during Laxfordian deformation.
It overprinted an earlier Inverian shear zone fabric, and was later reactivated and/or overprinted by brittle shearing of
different phases and different scales. Spatial analyses within the ArcGISTM environment has helped bring out the geological
relationships between different types of structural data in the shear zone, highlighting the partitioning of deformation into
zones of high and low strain. A kinematic interpretation based on the geospatial data analysis, combined with conventional
stereographic projection technique, is presented. |
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