Preface and Overview. Folded strata in the mountains of Italy (ca AD), Leonardo da Vinci
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1 Preface and Overview Folded strata in the mountains of Italy (ca AD), Leonardo da Vinci
2 Models of Mountain Building and Associated Deformation as represented by G.P. Scrope
3 Deformation Feature: Scales Dependent We can t understand continental deformation without understanding mountains, we can t understand mountains without understanding folding and faulting, we can t understand folding and faulting without understanding ductile and brittle deformation mechanisms at the atomic scale.
4 Occur in elongate linear belts. Mountains Mountains are constructed by tectonic plate interactions in a process called orogenesis.
5 Mountains Mountain building involves Structural deformation. Jointing. Faulting. Folding. Partial melting. Foliation. Metamorphism. Glaciation. Erosion. Sedimentation. Constructive processes build mountains up; destructive processes tear them back down again.
6 Aerial View of the European Alps
7
8 Tibetan Plateau and surrounding regions
9 Collision of Indian-Eurasian plate
10 Major Fragments in Southeast Asia during Late Paleozoic, Mesozoic and Early Cenozoic time
11 Analogue Model
12
13 The Principal Feature of Plate Tectonics
14 Classification of Geological Structures I. Geometry: planar (or subplanar) surface, curviplanar surface, linear feature, including the following classes of structures: joint, vein, fault, fold, shear zone, foliation and lineation. II. Geological Significance: Primary: formed as a consequence of the formation process of the rock itself. Local gravity-driven: formed due to slip down an inclined surface; slumping at any scale driven by local excess gravitational potential. Local density-inversion driven: formed due to local lateral variations in rock density, causing a local buoyancy force. Fluid-pressure driven: formed by injection of unconsolidated material due to sudden release of pressure. Tectonic: formed due to lithospheric plate interactions, due to regional interaction between the asthenosphere and the lithosphere, due to crustal-scale or lithosphere-scale gravitational potential energy and the tendency of crust to achieve isostatic compensation.
15 Classification of Geological Structures III. Timing of formation: Syn-formational: formed at the same time as the material that will ultimately form the rock. Penecontemporaneous: formed before full lithification, but after initial deposition. Post-formational: formed after the rock has fully formed. IV. Process of formation: Fracturing: related to development or coalescence of cracks in rock. Frictional sliding: related to the slip of one body of rock past another, or grains pas one another, both of which are resisted by friction. Plasticity: resulting from deformation by the internal flow of crystals without loss of cohesion, or by non-frictional sliding of crystal past one another. Diffusion: resulting from material transport either solid-state or assisted by a fluid (dissolution).
16 Classification of Geological Structures V. Mesoscopic cohesiveness during deformation: Brittle: formed by loss of cohesion across a mesoscopic discrete surface. Ductile: formed without loss of cohesion across a mesoscopic discrete surface. Brittle/Ductile: involving both brittle and ductile aspects. VI. Strain significances: Contractional: resulting in shortening of a region. Extensional: resulting in extension of a region. Strike-slip: resulting from movement without either shortening or extension. VII. Distribution of deformation: Continuous: occurs through the rock body at all scales. Penetrative: occurs throughout the rock body, at the scale of observation; up close, there may be spaces between structures. Localized: continuous or penetrative structure occurs only within a definable region. Discrete: structure occurs at an isolated feature.
17 Stress, Strain, and Deformation Stress (σ): acting on a plane is the force per unit area of the plane σ = F/area Unit of stress: Pascal (Pa) is the unit of stress. 1 Pa = 1 N m -2 = 1 kg m -1 s -2
18 Three Components of Deformation Deformation: Changes in shape, position or orientation of a body resulting from the application of differential stress (a state in which the magnitude of stress is not the same in all direction). In order to describe deformation, it is necessary to define a reference frame. Rotation: Pivoting of a body around a fixed axis. Translation: A change in the position of a body. Strain: A distortion or change in shape of a body
19 Strain in the Real World Homogeneous and heterogeneous strain
20 Translational and Rotational Components of Deformation
21 Deformation Represented as a Coordinate Transformation
22 Categories of Structural Analysis Descriptive analysis: The characterization of the shape and appearance of geological structures. Kinematic analysis: The determination of the movement paths that rocks or part of rocks have taken during transformation from the undeformed to have deformed state. Strain analysis: The development of mathematical tools for quantifying the strain in a rock. Dynamic analysis: The development of an understanding of stress and its relation to deformation. Mechanism analysis: The study of process on the atomic scale to grain scale that allows structures to develop. Tectonic analysis: The study of the relationship between structures and global tectonic processes.
23 Scale of Observation Mirco (Microscopic, 微觀的 ) : Refers to features that are visible optically at the scale of thin sections or that may only be evident with the electron microscope. Meso (Microscopic, 中觀的 ) : Refers to features that are visible in a rock outcrop, but cannot necessarily be traced from outcrop to outcrop. Macro (Microscopic, 巨觀的 ) : Refers to features that can be traced over a region encompassing several outcrops to whole mountain ranges. Meag (Microscopic, 宏觀的 ) : Prefix refers to continental-scale deformational such as the movements of tectonic plates over time.
24 Field in Antarctica
25 Attitude of a Plane and a Line Attitude of a plane ABCD: EF, strike; α, dip; GH, dip direction Attitude of a line EF: β, plunge; EG, plunge direction; γ, pitch Plane ABCD: 090 o /45 o N (strike and dip); 000 o /45 o (dip direction and dip) Line EF: 30 o /315 o (plunge and direction of plunge); 000 o /45 o, 40 o W
26 The Compass Strike and dip of a planar structure
27 Trend and Plunge of a Linear Structure
28 Homework and Assignment 1. Table 1.2: Terminology related to geometry and representation of geological structure: apparent dip, attitude, cross section, (true) dip, foliation, lineation, pitch, plunge, plunge direction, position, profile plane, rake, strike, trace, trend. 2. Table 1.3: Some guidelines for the interpretation of deformed areas.
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