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Are these interesting questions? • What is structural geology? – Describe the structure – Work out the history of deformation & the rest – Formulate models for the processes involved • What is a model? – Von Neumann’s definition: a mathematical construct, closed, that works; specific or more general – J. B. Thompson, Jr.’s notion (as remembered vaguely): “Petrologists look at rocks, make rocks, and think about rocks.” – Narrative versus model construction & application • What is not a model? – Analog model of a structure (“make a rock”) – Numerical model, as by FEM: simulation based on a model Examples of models It isn’t even wrong! Wolfgang Pauli Gilbert (1877) Report on the geology of the Henry Mountains *Anderson (1937) The dynamics of sheet intrusions *Ode (1957) Mechanical analysis of the dike pattern of the Spanish Peaks area, Colorado 113 Muller & Pollard (1977) Stress state near Spanish Peaks, Colorado determined from a dike pattern 83 Biot (1961) Theory of folding of stratified viscoelastic media and its application to …. 358 Sherwin & Chapple (1968) Wavelengths of single layer folds – a comparison between theory and observation Reches & Johnson (1977) Development of monoclines: Part II Theoretical analysis of monoclines 174 Pollard & Johnson (1977) Mechanics of growth of some laccolithic intrusions in the Henry Mountains 165 *Chapple (1978) Mechanics of thin-skinned fold and thrust belts 402 *Platt (1986) Dynamics of orogenic wedges and the uplift of high pressure metamorphic rocks 879 *Platt (1993) Mechanics of oblique convergence 70 *Fisher & Brantley (1992) Models of quartz overgrowth and vein formation: deformation and episodic fluid flow in an ancient subduction zone 116
