Abstract
The South Shetland Trench (SST) northwest of the South Shetland Islands is the only trench along the Pacific margin of the Antarctic Peninsula. Multichannel seismic reflection profile shows very narrow normal faulting zone (about 20 km) on the outer wall of the SST and thick trench-fill sediments (up to 1000 m) on two distinct crustal horst and graben structures in the trench. These structures are rare in the active subduction trenches. On the basis of the implications from these seismic structures and known tectonic history, the following scenarios of subduction activities of the former Phoenix plate are proposed: (1) normal faulting has not occurred since subduction rate in the SST sharply decreased after cessation of seafloor spreading at the West Scotia Ridge at about 6 Ma; and (2) subduction almost stopped after the cessation of spreading in Drake Passage at about 3.3 Ma. Recent contractional structures around the SST are indicative of current crustal shortening (not subduction) accommodating trenchward movement of South Shetland Islands caused by the ongoing extension of Bransfield Basin behind the South Shetland Islands.
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References
Barker, P.F., 1982, The Cenozoic subduction history of the Pacific margin of the Antartic Peninsula: Ridge crest-trench interactions. Journal of the geological Society, London, 139, 24017–24043.
Behrmann, J.H., Lewis, S.D, Musgrave, R.J. et al., 1992, Proceeding of the Ocean Drilling Program Initial Reports. Ocean Drilling Program, v.141, 708 p.
Dietrich, R., et al., 2001, ITRF coordinates and plate velocities from repeated GPS campaigns in Antarctica-An analysis based on diffent individual solutions. Journal of Geodesy, 74, 756–766.
Galindo-Zaldívar, J., Gamboa, L., Maldonado, A., Nakao, S., and Bochu, Y., 2004, Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula. Marine Geology, 206, 267–282.
Gonzalez-Casado, J.M., Giner-Robles, J.L., and Lopez-Martinez, J., 2000, Bransfield Basin, Antarctic Peninsula: Not a normal backarc basin. Geology, 28, 1043–1046.
Henriet, J.P., Meissner, R., Miller, H., and Team, T.G., 1992, Active margin processes along the Antarctic Peninsula. Tectonophysics, 201, 229–253.
Hilde, T.W.C., 1983, Sediment subduction versus accretion around the Pacific. Tectonophysics, 99, 381–397.
Jin Y.K., Lee, M.W., Kim, Y., Nam, S.H., and Kim, K.J., 2003, Gas hydrate volume estimations on the South Shetland continental margin, Antarctic Peninsula. Antarctic Science, 15, 271–282.
Kim, Y., Kim, H.-S., Larter, R.D., Camerlenghi, A., Gamboa, L.A.P., and Rudowski, S., 1995, Tectonic deformation in the upper crust and sediments at the South Shetland Trench. In: Cooper, A.K., Barker, P.F., and Brancolini, G. (eds.), Geology and seismic stratigraphy of the Antarctic margin: Antarctic Research Series 68, Washington, D.C., American Geophysical Union, p. 157–166.
Klepeis, K.A. and Lawver, L.A., 1996, Tectonics of the Antarctic-Scotia plate boundary near Elephant and Clarence Islands, West Antractica. Journal of Geophysical Research, 89, 20211–20231.
Larter, R.D. and Barker, P.F., 1991, Effects of Ridge Crest-Trench Interaction on Antarctic-Phoenix Spreading: Forces on a Young Subducting Plate. Journal of geophysical research, 96, 19583–19607.
Larter, R.D., Rebesco, M., Vanneste, L.E., Gamboa, L.A.P., and Barker, P.F., 1997, Cenozoic tectonic, sedimentary and glacial history of the continental shelf west of Graham Land, Antarctic Peninsula. In: Barker, P.F. and Cooper, A.K. (eds.), Geology and Seismic Stratigraphy of the Antarctic Margin, Part 2: Antarctic Research Series 71, Washington, D. C., American Geophysical Union, p. 1–27.
Lawver, L.A., Sloan, B.J., Barker, D.H.N., Ghidella, M., Von Herzen, R.P., Keller, R.A., Klinkhammer, G.P., and Chin, C.S., 1996, Distributed, Active Extension in Bransfield Basin, Antarctic Peninsula: Evidence from Multibeam Bathymetry. GSA Today, 6, 1–5.
Livermore, R., Balanyá, J.C., Maldonado, A., Martínez, J.M., Rodríguez-Fernández, J., de Galdeano, C.S., Zaldívar, J.G., Jabaloy, A., Barnolas, A., Somoza, L., Hernández-Molina, J., Suriñach, E., and Viseras, C., 2000, Autopsy on a dead spreading center: The Phoenix Ridge, Drake Passage, Antarctica. Geology, 28, 607–610.
Ludwig, W.J., Ewing, J.J., Ewing, M., Murauchi, S., Den, N., Asano, S., Hotta, H., Hayakawa, M., Asanuma, T., Ichikawa, K., and Noguchi, I., 1966, Sediments and structure of the Japan trench. Journal of Geophysical Research, 71, 2121–2137.
Ludwig, W.J. and Houtz, R.E., 1979, Isopach map of sediments in the Pacific Ocean Basin and marginal sea basins, American Association of Petroleum Geologists, Tulsa, No. 647.
MacKey, M.E. and Moore, G.F., 1990, Variation in deformation of the south Panama accretionary prism: Response to oblique subduction and trench sediment variation. Tectonophysics, 9, 683–698.
Maldonado, A., Larter, R.D., and Aldaya, F., 1994, Fore-arc tectonic evolutions of the South Shetland margin, Antarctic Peninsula. Tectonics, 13, 1345–1370.
Maldonado, A., Balanyá, J.C., Barnolas, A., Galindo-Zaldívar, J., Hernández, J., Jabaloy, A., Livermore, R., Martínez-Martínez, J.M., Rodríguez-Fernández, J., de Galdeano, C.S., Somoza, L., Suriñach, E., and Viseras C., 2000, Tectonics of an extinct ridgetransform intersection, Drake Passage (Antarctica). Marine Geophysical Researches, 21, 43–68.
Masson, D.G., 1991, Fault patterns at outer trench walls. Marine Geophysical Researches, 13, 209–225.
Nowlin, W.D. Jr. and Zenk, W., 1988, Westward bottom currents along the margin of the South Shetland Island arc: Deep-Sea Research, 35, 269–301.
Pankhurst, R.J., 1990, The Paleozoic and Andean magmatic arcs of West Antarctica and southern South America. In: Kay, S.M. and Rapela, C.W. (eds.), Plutonism fromAntarctica to Alaska, Boulder, Geological Society of America, p. 1–7.
Porebski, S.J., Meischner, D., and Gorlich, K., 1991, Quaternary mud turbidites from the South Shetland Trench (West Antarctica): recognition and implications for turbidite facies modelling. Sedimentology, 38, 691–715.
Ruff, L.J., 1989, Do trench sediments affect great earthquake occurrence in subduction zones? Pure and Applied Geophysics, 129, 263–282.
Seely, D.R., 1977, The significance of landward vergence and oblique structural trends on trench inner slopes. In: Talwani, M., and Pitman III, W.C. (eds.), Island arcs, deep sea trenches, and back-arc basin, Washington, D. C., American Geophysical Union, p. 187–198.
Smith, W.H.F. and Sandwell, D.T., 1997, Global sea floor topography from satellite altimetry and ship depth sounding. Science, 277, 1956–1962.
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Jin, Y.K., Lee, J., Hong, J.K. et al. Is subduction ongoing in the South Shetland Trench, Antarctic Peninsula?: new constraints from crustal structures of outer trench wall. Geosci J 13, 59–67 (2009). https://doi.org/10.1007/s12303-009-0005-5
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DOI: https://doi.org/10.1007/s12303-009-0005-5