課程資訊

Geodynamics

102-1

Geo5022

224 U0420

Ceiba 課程網頁
http://ceiba.ntu.edu.tw/1021geodynamics

This course will introduce the fundamental continuum physics applied in understanding the working of plate tectonics, mantle convection and a variety of geological processes. The material of the course contents will present the mathematical concepts as less as possible unless they are essential to understand the physical principles. They will cover basic elasticity and fluid mechanics involved in the studies of the bending of elastic plates, the heat transfer through conduction at thermal boundary layers and mantle convection, the two-phase porous flow applied in partial melting and magma generation, etc.

(1) Plate kinematics
Plate motion on a sphere, relative plate motion,
absolute plate motion.
(2) Elasticity and plate flexure
stresss and strain, bending or flexure of plates under
applied moments and vertical loads, application to the
earth’s lithosphere under the loads of island chains,
at an ocean trench an sedimentary basins.
(3) Heat transfer
Fourier’s law of heat conduction, the earth’s surface
heat flux, cooling of the oceanic lithosphere,
solidification of dikes, thermal stress, subsidence of
seafloor topography and sedimentary basins.
(4) Fluid mechanics
Consevation of mass, momentum and energy, the stream
function, 1-D channel flow, postglacial rebound,
stoke’s flow, thermal convection, boundary layer
theory, linear stability analysis, the forces that
drive mantle convection.
(5) Flow in porous media
Darcy’s law, permeability models, porous flow model for
melt migration, two-phase convection.

Dynamic earth: plates, plumes and mantle convection by Geoffrey Davies,Cambridge University Press, 1999.Geodynamics: Applications of continuum physics to geological problems by D.L Turcotte and G. Schuber, John Wiley & Sons,

(1) Stress and Strain (Ch 3. T&S)
(2) Conservation Laws of Continuum Mechanics
(3) Elasticity and plate flexure
stress and strain, bending or flexure of plates under applied moments and
vertical loads, application to the earth’s lithosphere under the loads of island
chains, at an ocean trench and sedimentary basins (Ch. 2, 3 of T&S). 2
(4) Gravity/Geoid
Earth’s shape, compensation models and observed geoid anomalies (Ch. 5 of
T&S)
(5) Heat transfer and thermal conduction
Fourier’s law of heat conduction, the earth’s surface heat flux, cooling of the
oceanic lithosphere, solidification of dikes, thermal stress, subsidence of
seafloor topography (Ch. 4 of T&S).
Week 11 (or 12): Mid-Term Exam (sections 1-5 and reading assignments)
(6) Rock Rheology (optional)
deformation mechanism, diffusion creep, dislocation, mantle rheology (Ch. 7 of
T&S)
(7) Fluid mechanics and mantle convection
Conservation of mass, momentum and energy, the stream function, 1-D
channel flow, postglacial rebound, Stokes flow, thermal convection,
boundary layer theory, linear stability analysis, the forces that drive mantle
convection (Ch. 6 of T&S).
Week 18: Final Presentation

Office Hours

Textbooks
Geodynamics: Applications of continuum physics to geological problems, 2nd Ed. by D.L Turcotte and G. Schubert, Cambridge University Press, 2001 (T&S).

Mantle Convection in the Earth and Planets, Schubert, G., Turcotte, D. L. and P. Olson, Cambridge University Press, 2001
Dynamic earth: plates, plumes and mantle convection by Geoffrey Davies,
Cambridge University Press, 1999 (GF).
The lecture notes by David Sandwell

(僅供參考)

 No. 項目 百分比 說明 1. Midterm 40% Both midterm and finals are open books and lecture notes. 2. Final presentation 30% Each one will be assigned to present a classical paper related to the course material and lead the discussion in class. 3. Homework 30% Homework will be assigned every week and must be handed in by the due date in order for you to get the full credit. Late homework will receive partial credit only.

 課程進度
 週次 日期 單元主題 第1週 9/10 Stress 第2週 9/17 strain 第3週 9/24 Elasticity and Flexure 第4週 10/01 Elasticity and Flexure // Gravity 第5週 10/08 Gravity 第6週 10/15 Gravity // Heat 第7週 10/22 Heat 第8週 10/29 Heat 第9週 11/05 Heat 第10週 11/12 期中考