Auxiliary material for
Untangling inconsistent magnetic polarity records through an integrated rock
magnetic analysis: A case study on Neogene sections in East Timor
F.M. Aben1,2*, M.J. Dekkers1, R.R. Bakker1,3, D.J.J. van Hinsbergen4, W.J.
Zachariasse4, G.W. Tate5, N. McQuarrie6, R. Harris7, B. Duffy8
1) Paleomagnetic Laboratory Fort Hoofddijk, Utrecht University, Budapestlaan 17, 3584 CD Utrecht ,
the Netherlands
2) now at Institute de Science de la Terre, UJF-grenoble, ISTerre - BP53, 38041 Grenoble – CEDEX 9,
France
3) Department of Earth Sciences, ETH Zurich, NO D 51.3, Sonneggstrasse 5, 8092 Zurich, Switzerland
4) Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, the
Netherlands
5) Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544, United States
6) Geology and Planetary Science, University of Pittsburgh, 4107 O’Hara Street, SRCC Room 200,
Pittsburgh, PA 15260, United States
7) Department of Geological Sciences, Brigham Young University, S389 ESC, Provo, UT, 84602,
United States
8) Department of Geological Sciences, University of Canterbury, Christchurch, New Zealand.
Geochemistry, Geophysics, Geosystems
Introduction
The auxiliary information includes an explanation of how the optimal number of endmembers is determined, by using the Viqueque Type section as an example (file
text01). Text02 includes an in-depth discussion on some features observed in the
FORC-diagrams, and presents a conceptual model for the genesis of the magnetic
minerals magnetite and greigite in the Viqueque Type section. This is developed by
using the IRM-acquisition end-member model. The logged NRM-components are
given in tables ts01 and ts02 for the Viqueque Type and Cailaco River section
respectively.
1. Text01: Detailed description of the classic paleomagnetic approach, including
methods.
2. Text02: Explanation of the method for determination of the optimal number of endmembers. Detailed description of the rock magnetic properties.
3. Text03: Extra discussion on the interpretation of the end-members. Extra
discussion on the FORC-diagrams and presentation of a conceptual genesis model for
the magnetic minerals in the Viqueque Type section.
4. Text04: Discussion on the high temperature polarity components and directions.
5. Ts01: Table with all the logged NRM-components of the Viqueque Type section
5.1 first column: Number of sample
5.2 2nd column: Stratigraphic level of the sample (in m)
5.3 3rd column: Components’ declination (in degree’s)
5.4 4th column: Components’ inclination (in degree’s)
5.5 5th column: Intensity of the component (in micro-Ampère per meter)
5.6 6th column: Error of component fit through the measured data-points in the
thermal demagnetization diagram
5.7 7th column: Temperature range of the component; the component is calculated
between the lowest and highest temperatures indicated (in ºC)
5.8 8th column: If the component is rejected by the variable angle cut-off (Vandamme
cut-off), it is indicated by an X. This component is discarded.
6. Ts02: Table with all the logged NRM-components of the Cailaco River section
6.1 first column: Number of sample
6.2 2nd column: Stratigraphic level of the sample (in m)
6.3 3rd column: Components’ declination (in degree’s)
6.4 4th column: Components’ inclination (in degree’s)
6.5 5th column: Intensity of the component (in micro-Ampère per meter)
6.6 6th column: Error of component fit through the measured data-points in the
thermal demagnetization diagram
6.7 7th column: Temperature range of the component; the component is calculated
between the lowest and highest temperatures indicated (in ºC)
6.8 8th column: If the component is rejected by the variable angle cut-off (Vandamme
cut-off), it is indicated by an X. This component is discarded.