Welcome to Andrea Regina Biedermann's Research Page

I have been fascinated by minerals and rocks for as long as I can remember. When I was a little girl, I smuggled tons of them into my dad’s backpack during family hikes. A few years later, and after having studied geophysics, I am now privileged to work with minerals or rocks on a daily basis – be it during field work or in the lab. My research focuses on

  • How magnetic anisotropy in single crystals is related to crystal structure and chemical composition
  • The relationship between mineral and magnetic fabrics in rocks
  • The effects anisotropy has on the direction and intensity of remanent magnetization, or the shape and amplitude of magnetic anomalies
  • How we can use magnetic anisotropy to investigate pore fabrics and preferred flow directions

This knowledge can be used to interpret magnetic anisotropy in terms of geologic processes or rock texture, to infer preferred flow directions, and for a more reliable interpretation of paleomagnetic directions and magnetic anomalies.

 

Interested? Want to collaborate?

Join me and discover more on these pages. Or send a message to: andrea (dot) regina (dot) biedermann (at) gmail (dot) com

 

Applications are now being accepted for a technician for my magnetic pore fabrics project >>

 

 

 

News

Presentation at the GSA Meeting, Indianapolis, USA: Hamelin, C., Biedermann, A.R., Whitney, D.L., Teyssier, C.: A novel approach for extracting early, higher-P records from rocks overprinted at HP-LT conditions: Integrating metamorphic petrology and magnetic fabrics of amphibolites exhumed in a migmatite dome.

Out now:

  • Hirt, A.M., and Biedermann, A.R., Preferred orientation of ferromagnetic phases in rock-forming minerals: Insights from magnetic anisotropy of single crystals. Canadian Journal of Earth Sciences, DOI:10.1139/cjes-2018-0172
  • Khakhalova, E., Moskowitz, B.M., Williams, W., Biedermann, A.R., and Solheid, P., Magnetic vortex states in small octahedral particles of intermediate titanomagnetite. Geochemistry, Geophysics, Geosystems 19(9), DOI:10.1029/2018GC007723

My new paper is online: Biedermann, A.R. (2018), Magnetic anisotropy in single crystals: a review. Geosciences 8(8), DOI:10.3390/geosciences8080302 >>

Learn about the Earth's magnetic field with the SRF Wissenschaftsmagazin >> and SRF Kultur >>

Presentation at the 16th Castle Meeting, Checiny, Poland: Biedermann, A.R., Jackson, M., Bilardello, D., Feinberg, J.M., Hirt, A.M.: Magnetic anisotropy of ferromagnetic grains – comparison of different methods

Looking forward to working at the University of Bern, Switzerland, starting November 2018 - so excited about this new project! 

Presentations at the EGU 2018 General Assembly, Vienna, Austria: 

  • Biedermann, A.R., Hirt, A.M. (Invited): Magnetic anisotropy of single crystals. 
  • Biedermann, A.R., Jackson, M., Bilardello, D., Feinberg, J.M.: Coercivity-dependence of remanence anisotropy: Implications for anisotropy corrections in paleodirectional and paleointensity studies. 
  • Biedermann, A.R., Teyssier, C., Ferré, E.C., Chatzaras, V., Kaczmarek, M.-A.: Variations in magnetic anisotropy related to strain and serpentinization gradients in two shear zones from the New Caledonia ophiolite. 

Presentations at the AGU 2017 Fall Meeting, New Orleans, USA:

  • Biedermann, A.R., Bilardello, D., Jackson, M., Feinberg, J.M.: Anisotropy of anhysteretic remanent magnetization (AARM) and its dependence on experimental parameters – implications for fabric interpretation and paleomagnetic corrections. 
  • Karageozian, M., Brownlee, S.J., Biedermann, A.R. Feinberg, J.M.: Comparing anisotropy of magnetic susceptibility (AMS) tensors with deformation fabric and elastic tensors in the Chester gneiss dome, southeast Vermont. 
  • Khakhalova, E., Moskowitz, B.M., Biedermann, A.R., Solheid, P.: Magnetic microstructures in small octahedral particles of Ti-rich titanomagnetite.

Nov 2017: Our new paper is online: Biedermann, A.R., Kunze, K., and Hirt, A.M. (2018), Interpreting magnetic fabrics in amphibole-bearing rocks, Tectonophysics, DOI:10.1016/j.tecto.2017.11.033

Oct 2017: Our new paper is online: Biedermann, A.R., and McEnroe, S.A. (2017), Effects of magnetic anisotropy on total magnetic field anomalies, Journal of Geophysical Research - Solid Earth, DOI:10.1002/2017JB014647

Presentation at the GSA Annual Meeting, Seattle, USA, Oct 24th: Biedermann, A.R., Bilardello, D., Jackson, M., Feinberg, J.M.: Isolating components of complex magnetic fabrics to enhance the anisotropy correction of paleomagnetic directions and intensities

Aug 2017: Our new paper is online: Biedermann, A.R., Jackson, M., Bilardello, D., Feinberg, J.M., Brown, M.C., and McEnroe, S.A. (2017), Influence of static alternating field demagnetization on anisotropy of magnetic susceptibility: Experiments and implications, Geochemistry, Geophysics, Geosystems, DOI:10.1002/2017GC007073

Presentation at the International Conference on Rock Magnetism in Utrecht, Netherlands, Jul 14th: Biedermann, A.R., Jackson, M., Bilardello, D., Feinberg, J.M., Brown, M.C., & McEnroe, S.A.: Influence of alternating field demagnetization on susceptibility and anisotropy of susceptibility

Seminar: 'Variation of AMS parameters during alternating field demagnetization' on Jun 21st at the Institute for Rock Magnetism, University of Minnesota, USA

Presentations at the EGU 2017 General Assembly:

  • A.R. Biedermann, D. Bilardello, M. Jackson, P. Solheid & J.M. Feinberg: 'Variation of magnetic anisotropy with coercivity in rocks with multiple remanence carriers, as shown by anisotropy of remanence experiments' on Apr 27th, EMRP3.3 session
  • A.R. Biedermann, A.M. Hirt & K. Kunze: 'Magnetic fabrics in amphibolites' on Apr 27th, EMRP3.3 session

Mar 2017: Find my article in the new IRM Quarterly: Towards a holistic understanding of complex magnetic fabrics

Seminar: 'Magnetic anisotropy -  measurement techniques, models, and geologic applications' on Feb 27th, Hard Rock Lunch Seminar, Department of Earth Sciences, University of Minnesota, USA

Seminar: 'Magnetic anisotropy - from single crystals to total field anomalies ' on Feb 1st at the Institute for Rock Magnetism, University of Minnesota, USA

Jan 2017: Out now: Biedermann, A.R., Jackson, M., Bilardello, D., and McEnroe, S.A.: Effect of magnetic anisotropy on the natural remanent magnetization in the MCU IVe' layer of the Bjerkreim Sokndal Layered Intrusion, Rogaland, Southern Norway. Journal of Geophysical Research – Solid Earth