Magnetostratigraphy

Updated in Feb 02, 2023 06:22 PM

-- Elective Course; 3 credits ---

Topics:

1. Early developments
2. The Geomagnetic Field

2.1 The Geocentric Axial Dipole Hypothesis
2.2 Models of Field Reversal
2.3 Polarity Transition Records and VGP Paths
2.4 Statistical Structure of the Geomagnetic Polarity Pattern

3. Magnetization Processes and Magnetic Properties of Sediments

3.1 Basic principles
3.2 Magnetic minerals
3.3 Magnetization processes
3.4 Magnetic properties of marine and terrestrial sediments

4. Laboratory Techniques

4.1 Resolving magnetization components
4.2 AF Demagnetization
4.3 Stepwise thermal desmagnetization
4.4 Statistical analysis
4.5 Processes for the identification of magnetic minerals

5. Fundamentals of Magnetic Stratigraphy

5.1 Principles and definitions
5.2 Polarity zone and polarity chron nomenclature
5.3 Field tests for timing of remanence acquisition
5.4 Field sampling for magnetic polarity stratigraphy
5.5 Presentation of magnetostratigraphic data
5.6 Correlation of polarity zones to the GPTS
5.7 Quality criteria for magnetostratigraphic data

6. The Pliocene-Pleistocene Polarity Record

6.1 Early development of the Plio-Pleistocene GPTS
6.2 Subchrons within the Matuyama Chron
6.3 Magnetic stratigraphy in Plio-Pleistocene sediments
6.4 Astrochronologic Calibration of the Plio-Pleistocene GPTS
6.5 40Ar/39Ar Age Calibration of the Plio-Pleistocene GPTS

7. Triassic and Paleozoic Magnetic Stratigraphy

7.1 Triassic
7.2 Permian
7.3 Carboniferous
7.4 Pre-Carboniferous
7.5 Polarity Bias in the Phanerozoic

8. Secular Variation, Excursions and the GITS

8.1 Introduction
8.2 Sediment records of secular variation
8.3 Geomagnetic excursions in the Brunhes Chron
8.4 The GITS

9. Rock Magnetic Stratigraphy and Paleointensities

9.1 Magnetic parameters sensitive to concentration, grain size, and mineralogy
9.2 Rock magnetic stratigraphy in marine sediments
9.3 Rock magnetic stratigraphy in loess deposits
9.4 Rock magnetic stratigraphy in lake sediments
9.5 Future Prospects
9.6 Paleointensity Determinations

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Bibliography:

- Cornell, R.M., Schwertmann, U., 2006, The Iron Oxides - Structure, Properties, Reactions, Occurrences and Uses, 2nd ed., John Wiley & Sons, Weinheim, 703 p.

- Dunlop, D.J., Özdemir, Ö, 2001, Rock Magnetism - Fundamentals and Frontiers, Cambridge University Press, New York, 596 p.

- Evans, M.E., Heller, F., 2003, Environmental Magnetism - Principles and Applications of Environmagnetics, Academic Press, New York, 299 p.

- Gubbins, D., Herrero-Bervera (eds.), 2007, Encyclopedia of Geomagnetism and Paleomagnetism, Springer, New York, 1054 p.

- Kono, M. (ed.), 2007, Treatise on Geophysics: Geomagnetism. Volume 5, Elsevier, New York, 589 p.

- McElhinny, M.W., McFadden, P.L., 2000, Paleomagnetism – Continents and Oceans, Academic Press, San Diego, 386 p.

- Opdyke, N.D., Channell, J.E.T., 1996, Magnetic Stratigraphy, Academic Press Inc., London, 341 p. Tauxe, L., 2010, Essencials of Paleomagnetism, University of California Press, San Diego, 489 p.