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Paleolatitudes and magnetostratigraphy for Cenozoic sediments, ODP Leg 182: The Great Australian Bight

Abstract

Cenozoic northward drift of the Australian plate was determined from paleomagnetism of Middle Eocene through Pleistocene sediment cores from ODP Leg 182 (Sites 1126, 1128, and 1134) in the Great Australian Bight. Paleolatitude estimates are based on stepwise AF and thermal demagnetization of 400 discrete samples, of which 250 provided reliable data. The characteristic magnetization of the sediments resides in magnetite and magnetic sulfides. Middle Eocene through Lower Oligocene (36 Ma) paleolatitudes of 52° (±2°) change gradually to Late Miocene (9 Ma) paleolatitudes of 48° (±2°). These data, combined with Australian paleomagnetic pole data, indicate a slow rate of northward motion through much of the Cenozoic (28 mm/yr). These data also indicate an abrupt acceleration in the Late Miocene (drift rate 115 mm/yr), coinciding with tectonic events in Southeast Asia. Paleolatitude estimates support Miocene versions of the Australian apparent polar wander path that place the Oligocene-Miocene pole (25 Ma) at 70°S–125°E and the Late Miocene pole at 70°S–105°E (e.g., Idnurm, 1985, 1994). Inclination data for discrete samples also provide a refined magnetostratigraphy for portions of the Miocene, Oligocene, and Eocene carbonate and siliciclastic section of the Great Australian Bight.

References

  1. Acton, G. D., Apparent polar wander of India since the Cretaceous with implications for regional tectonics and true polar wander, Mem. Geol. Soc. India, 44, 129–175, 1999.

  2. Acton, G. D. and W. A. Keetles, Geologic and paleomagnetic constraints on the formation of weathered profiles near Inverell, eastern Australia, Palaeogeography, Palaeoclimatology, Palaeoecology, 126, 211–225, 1996.

  3. Ali, J. R. and R. Hall, Evolution of the boundary between the Philippine Sea plate and Australia, paleomagnetic evidence from eastern Indonesia, Tectonophys., 251, 251–276, 1995.

  4. Anson, G. L. and K. P. Kodama, Compaction-induced shallowing of the post-depositional remanent magnetization in a synthetic sediment, Geophys. J. R. Astron. Soc., 88, 673–692, 1987.

  5. Berggren, W. A., D. V. Kent, C. C. Swisher, and M. P. Aubrey, Revised Cenozoic geochronology and chronostratigraphy, in Geochronology Time Scales and Global Stratigraphic correlation, SEPM Special Publication, 54, pp. 131–212, 1995.

  6. Cande, S. C. and D. V. Kent, A revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic, J. Geophys. Res., 100, 6093–6095, 1995.

  7. Day, R., M. Fuller, and V. A. Schmidt, Hysteresis properties of titanomagnetites: grain-size and compositional dependence, Phys. Earth Planet. Int., 13, 260–267, 1977.

  8. Dickinson, J. A., M. W. Wallace, G. R. Holdgate, S. J. Gallagher, and L. Thomas, Late Miocene uplift across the Southeast Australian margin, 14th Victorian universities earth sciences conference—Abstracts, Geol. Soc. Australia, 62, 21, 2000.

  9. Embleton, B. J. J. and M. W. McElhinny, Marine magnetic anomalies, palaeomagnetism and the drift history of Gondwanaland, Earth Planet. Sci. Lett., 58, 141–150, 1982.

  10. Feary, D. A., A. C. Hine, M. J. Malone, et al., Proc. ODP, Init. Repts., 182 (CD-ROM), College Station, TX, Ocean Drilling Program, Texas A&M University, 2000.

  11. Fuller, M., R. S. Molina-Garza, and Shipboard Scientific Party, Appendix-Magnetic Experiments, in Proc. ODP, Init. Repts., 182 (CD-ROM), edited by D. A. Feary, A. C. Hine, M. J. Malone, et al., College Station, TX, Ocean Drilling Program, Texas A&M University, 2000.

  12. Fuller, M., J. R. Ali, S. J. Moss, G. M. Frost, B. Richter, and A. Mahfi, 1999, Paleomagnetism of Borneo, J. Asian Earth Sci., 17, 3–24, 1999.

  13. Idnurm, M., Late Mesozoic and Cenozoic palaeomagnetism of Australia I, A redetermined apparent polar wander path, Geophys. J. R. Astron. Soc., 83, 399–418, 1985.

  14. Idnurm, M., New Late Eocene pole for Australia, time averaging of remanence directions, and palaeogeographic reference systems, Geophys. J. Int., 117, 827–833, 1994.

  15. Kirschvink, J. L., The least-squares line and plane and the analysis of paleomagnetic data: examples from Siberia and Morroco, Geophys. J. R. Astron. Soc., 62, 699–718, 1980.

  16. Klootwijk, C. T., J. S. Gee, J. W. Pierce, and G. M. Smith, Constraints on the India-Asia convergence: Paleomagnetic results from Ninetyeast Ridge, in Proc. ODP Sci. Results, 121, edited by J. Weissel, J. Pierce, E. Taylor, J. Alt, et al., College Station, TX, pp. 777–882, 1991.

  17. Kodama, K. and J. Ogg, Motion of the Australian Plate from sediment paleoinclinations, Early Cretaceous through Holocene, Proc. Ocean Drilling Program, Scientific Results, 123, 549–554, 1992.

  18. Lee, T. Y. and L. A. Lawver, Cenozoic plate reconstruction of Southeast Asia, Tectonophys., 251, 85–138, 1995.

  19. Linthout, K., H. Helmers, and J. Sopaheluwakan, Late Miocene obduction and microplate migration around the southern Banda Sea and the closure of the Indonesian Seaway, Tectonophys., 281, 17–30, 1997.

  20. McFadden, P. L. and M. W. McElhinny, Classification of the reversal test in palaeomagnetism, Geophys. J. Int., 103, 725–729, 1990.

  21. McFadden, P. L. and A. B. Reid, Analysis of paleomagnetic inclination data, Geophys. J. R. Astron. Soc., 69, 307–319, 1982.

  22. Musgrave, R. J., A weighted least-square fit of the Australian apparent polar wander path for the last 100 Myr, Geophysical Journal, 96, 231–243, 1989.

  23. Shipboard Scientific Party, Leg 182 Summary, in Proc. ODP, Init. Repts., 182, edited by D. A. Feary, A. C. Hine, M. J. Malone, et al., College Station, TX (Ocean Drilling Program), pp. 1–58, 2000.

  24. Tan, X. and K. P. Kodama, Compaction-corrected inclinations from southern California Cretaceous marine sedimentary rock indicate no paleolatitudinal offset for the Peninsular Ranges terrane, J. Geophys. Res., 103, 27169–27192, 1998.

  25. Zijderveld, J. D. A., A.C. demagnetization of rocks: Analysis of results, in Methods in Rock Magnetism and Paleomagnetism, edited by D. W. Collinson, K. M. Creer, and S. K. Runcorn, pp. 254–286, Elsevier, Amsterdam, 1967.

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Correspondence to Roberto S. Molina Garza.

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Keywords

  • Miocene
  • Eocene
  • Oligocene
  • Late Miocene
  • Middle Miocene