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Geology; March 2001; v. 29; no. 3; p. 235-238; DOI: 10.1130/0091-7613(2001)029<0235:POPGBG>2.0.CO;2
© 2001 Geological Society of America
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Provenance of Proterozoic garnet-biotite gneiss recovered from Elan Bank, Kerguelen Plateau, southern Indian Ocean

Kirsten Nicolaysen*,1, Samuel Bowring1, Frederick Frey1, Dominique Weis2, Stephanie Ingle2, Malcolm S. Pringle3 and Millard F. Coffin4

1 Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02140, USA
2 Department of Earth and Environmental Sciences, Université Libre de Bruxelles, CP 160/02, Avenue F.D. Roosevelt, 50, B-1050 Brussels, Belgium
3 Scottish Universities Environmental Research Centre, East Kilbride, Scotland G75 OQF, UK
4 Institute for Geophysics, University of Texas, Austin, Texas 78759-8500, USA Leg 183 Shipboard Scientific Party,{dagger}

At Elan Bank of the Kerguelen Plateau in the southeast Indian Ocean, Leg 183 of the Ocean Drilling Program recovered clasts of garnet-biotite gneiss in a fluvial conglomerate intercalated with basalt flows. U-Pb and Pb-Pb dates of zircons and monazites in these clasts and an overlying sandstone range from 534 to 2547 Ma, which is much older than the surrounding Indian Ocean seafloor. These dates show that old continental crust resides in the shallow crust of the oceanic Kerguelen Plateau and that the breakup of Gondwana dispersed continental fragments into the nascent Indian Ocean lithosphere.

Key Words: Kerguelen Plateau • geochronology • continental crust • Proterozoic • Indian Ocean.




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