Ukrainian Antarctic journal

No 4-5 (2006): Ukrainian Antarctic Journal
Articles

Evolution and geodynamics of the main structures of the Western Antarctic in Mezo-Cenozoic: modern conception

V. G. Bakhmutov
S. I. Subbotin Institute of geophysics of NAS of Ukraine, Kyiv
Published December 15, 2006
Keywords
  • West Antarctica,
  • Bransfield Strait,
  • geodynamic,
  • rifting

Abstract

Evolution of the Western Antarctic in the framework of new geological-geophysical data and modern conceptions of geodynamics of this region are described. The understanding of the processes which have formed the modern tectonic appearance of the Western Antarctica is impossible without analysis of the basic ideas about evolution and geodynamics of this region. The results of activity of the main tectonic processes with connection of depositional processes are reflected in structure (morphological features) of the sea floor. In the modern structure of Western Antarctic there are distinctly separated rifting zones connected with spreading and recent seafloor formation. The evolution stages of Antarctic plate, Drake Passage, rifting zone of Bransfield Strait, the South-Shetland trench are briefly discussed in according with modern plate tectonic schemes. Within the continental part of the Western Antarctica the continental riftogenesis along the Southern Scotia ridge and Bransfield Strait are associated with mantle diapir injections. To judge by the gravity anomalies, the rifts are present in Drake Passage and adjoining areas of sea floor. Their weak seismic activity specifies that either development of rifting zones has been completed or, having begun recently, it has stopped by some reason.

References

  1. Bakhmutov, V.G. (2002). Geologicheskie i paleomagnitny`e issledovaniya v Zapadnoj Antarktike (rajon Argentinskix ostrovov) i ix znachenie dlya paleotektonicheskix rekonstrukcij Antarkticheskogo poluostrova. [Geological and paleomagnetic studies in West Antarctica (area of the Argentine Islands) and their significance for paleotectonic reconstructions of the Antarctic Peninsula]. Byul Bulletin UAC, 4, 11-24.
  2. Grikurov, G.E`. (1973). Geologiya Antarkticheskogo poluostrova. [Geology of the Antarctic Peninsula]. Moscow, Nauka.
  3. Levashov, S.P., Bakhmutov, V.G., Korchagin, I.N., Pishhany`j, Yu.M., & Yakimchuk, N.A. (2006). Geoe`lektricheskie issledovaniya vo vremya provedeniya sezonny`x rabot 11 Ukrainskoj Antarkticheskoj e`kspedicii. [Geoelectric research during the seasonal work of the 11th Ukrainian Antarctic Expedition]. Geoinformatica, 2, 24–33.
  4. Udincev, G.B., Shenke, G.V., Shene, T., Beresnev, A.F., Efimov, P.N., Kol`czova, A.V., … Gilod, D.A. (1999). Morfodinamika vnedryayushhegosya rifta proliva Bransfild, Zapadnaya Antarktika. [Morphodynamics of the intruding rift in Bransfield Strait, West Antarctica]. DAN, 368,(2), 259–263.
  5. Udincev, G. B., & Shenke, G.V. (2004). Ocherki geodinamiki Zapadnoj Antarktiki. [Essays on the Geodynamics of West Antarctica]. Moscow, GEOS.
  6. Barker, D.H.N., & Austin, J.A. (1998). Rift propagation, detachment faulting and associated magnetism in Bransfield Strait, Antarctic Peninsula. Journal of Geophysical Research, 103(B10), 24017–24043.
  7. Cande, S.C., Herron, E.M., & Hall, B.R. (1982). The early Cenozoic tectonic history of the southeast Pacific. Earth Planet. Sci. Lett., 57, 63–74.
  8. Cande, S.C., Raymond, A.C., Stock, J., & Haxby, W.F. (1995). Geophysics of the Pitman Fracture Zone and Pacific-Antarctic plate motions during the Cenozoic. Science, 270, 947–953.
  9. Christeson, G.L., Barker, D.H.N., Austin, Jr.J.R., & Dalziel, I.W.D. (2003). Deep crustal structure of Bransfield Strait: Initiation of a back arc basin by rift reactivation and propagation. J. Geophys. Res., 108(B10), 2492.
  10. Cunningham, A.P., Barker, R.F., Gohl, K., & Nitsche, F.O. (2002). Multichannel seismic investigation of the ‘Bellingshausen Gravity Anomaly’ and West Antarctic continental margin near 95°W. Proceedings of the 8th International Symposium on Antarctic Earth Sciences, Bull.R.Soc.N.Z., 35, 201–206.
  11. Dalziel, I.W.D., & Elliot, D.H. (1982). West Antarctica: problem child of Gondwanaland. Tectonics, 1, 3–19.
  12. Elliot, D.H. (1997). The planar crest of Graham Land, Northern Antarctic Peninsula: possibly origins and timing of uplift. Geology and Seismic stratigraphy of the Antarctic margin. 2. Antarctic research series, 71, 51–73.
  13. Galindo-Zaldivar, J., Jabaloy, A., Maldonado, A., Martinez-Martinez, J.M., Galdeano, C.S., Somoza, L., & Surinach, E. (2000). Deep crustal Structure of the area of intersection between the Shackleton Fracture Zone and the West Scotia Ridge (Drake Passage, Antarctica). Tectonophysics, 320, 123–139.
  14. Grad, M., Guterch, A., Janik, T. (1993). Seismic structure of the lithosphere across the zone of subduced Drake Plate under the Antarctic Plate, West Antarctica. Geophys. J. Int., 115, 568–600.
  15. Guterch, A., Grad, M., Janik, T., & Sroda, P. (1998). Polish Geodynamic Expedition - seismic structure of the West Antarctica. Polish Polar Res., 19(1-2), 113–123.
  16. Heinemann, J., Stock, J., Clayton, R., Hafner, K., Cande, S., & Raymond, C. (1999). Constraints on the proposed Marie Byrd Land-Bellingshausen plate boundary from seismic reflection data. J. Geophys. Res., 104, 25321–25330.
  17. Larter, R.D., & Barker, P.F. (1991). Effects of ridge crest-trench interaction on Antarctic-Phoenix spreading: Forces on a young subducting plate. J. Geohys. Res., 96, 19583–19607.
  18. Larter, R.D., Cunningham, A.P., Barker, P.F., Gohl, K., & Nitsche, F.O. (1999). Structure and tectonic evolution of the West Antarctic continental margin and Bellngshausen Sea. Korean J. Polar Res., 10, 125–133.
  19. Larter, R.D., Cunningham, A.P., Barker, P.F., Gohl, K., & Nitsche, F.O. (2002). Tectonic evolution of the Pacific margin of Antarctica. 1. Late Cretaceous tectonic reconstructions. J. Geophys. Res., 107(B12), 2345.
  20. Livermore, L., Balanya, J.C., Maldonado, A., Martinez, J.M., Rodriguez-Fernandez, J., Galdeano, C.S., Galindo-Zaldivar, J., Jabaloy, A., Barnolas, A., Somoza, L., Hernandez-Molina, J., Surinach, E., & Viseras, C. (2000). Autopsy on a dead spreading center: the Phoenix Ridge, Drake Passage, Antarctica. Geology, 28(7), 507–510.
  21. Maldonado, A., Balanya, J.C., Barnolas, A., Galindo-Zaldivar, J., Hernandez, J., Jabaloy, A., Livermore, L., Martinez, J.M., Rodriguez-Fernandez, J., Galdeano, C.S., Somoza, L., Surinach, E., & Viseras, C. (2000). Tectonics of an extinct ridge-transform intersection, Drake Passage (Antarctica). Marine Geophys. Res., 21, 43–68.
  22. McAdoo, D.C., & Marks, K.M. (1992). Gravity fields of the Southern Ocean from Geosat data. J. Geophys. Res., 97, 3247–3260.
  23. McAdoo, D.C., & Laxon, S. (1997). Antarctic tectonics: Constrains from an ERS-1 satellite marine gravity field. Science, 276, 556–560.
  24. McCarron, J.J., & Larter, R.D. (1998). Late Cretaceous to early Tertiary subduction history of the Antarctic Peninsula. J. Geol. Soc. London, 155, 255–268.
  25. Sandwell, D.T., & Smith, W.H.F. (1997). Marine gravity-anomaly from Geosat and ERS-1 satellite altimetry. J. Geophys. Res., 102, 10039–10054.
  26. Schult, A., & Guerreiro, S.D.C. (1979). Paleomagnetism of Mesozoic igneous rocks from the Maranhao Basin, Brazil and the time of opening of the South Atlantic. Earth Planet. Sci. Lett., 42, 427–436.
  27. Storey, B.C., Vaughan, A.P.M., & Millar, I.L. (1996). Geodynamic evolution of the Antarctic Peninsula during Mesozoic times and its bearing on Weddell Sea history. Weddell Sea teconics and Gondwana Break-up. Ed. by B.C. Storey, E.C.King, & L.A. Livermore. Geol. Soc. Special Publ. London, 108, 87–103.
  28. Sutherland, R. (1999). Basement geology and tectonic development of the greater New Zealand region: An interpretation from regional magnetic data. Tectonophysics, 308, 341–362.