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INTRODUCTION |
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Finite Strain Analysis, Incremental Strain Analysis, Kinematic Analysis, and Fault Analysis are at the core of modern structural geology. These analytic tools allow structural geologists to i/ describe and quantify strain at the local scale (from a thin section of rock to the outcrop scale) and ii/ understand the deformation history. The aims of structural geology is to characterize strain at the local scale.
Tectonics, the subject of this course, requires a change from the local scale to the regional scale (up to few thousand kilometres). This is done by integrating in maps measurements and observations made at the local scale. These maps (trajectory and contour maps) illustrate how structural parameters (e.g., shape of the finite strain ellipsoid, intensity of strain, orientation of foliations and lineations, kinematics...) change regionally. Those maps characterise what tectonicists call the Regional Finite Strain Field.
Because the structures that develop during large scale deformation (e.g., nappes, thrusts, normal faults, strike slip faults, and diapir) develop characteristic finite strain fields, trajectory maps and contour maps offer some clues about the nature of large scale structures and their spatial and temporal relationships.
In this course we will examine the finite strain fields associated with every major classes of structure and that of their possible interferences. This course assume that students are familliar with basic structural geology. In particular students following this course should have basic knowledge of stuctures such as fractures, faults and shear sones, folds and boudinage.
Enjoy.
Patrice |
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