East Scotia Ridge unsecured

1994 major element trace element and isotope pb sr and

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Unformatted text preview: identified as sediment or sediment melt and an aqueous fluid. ACKNOWLEDGEMENTS ¨ We thank C.-D. Garbe-Schonberg and T. Arpe for their extensive help with the ICP-MS analyses, and Kaj Hoernle and Folkmar Hauff for their valuable assistance with the TIMS analyses. Many thanks go to Dietrich Ackermand, Nigel Bruguier, Alex Cunningham, Graham Eagles, Chris German, Helge Moller, Sven Petersen, ¨ Teal Riley, Ulrich Schwarz-Schampera and the captains and crews of the Polarstern and James Clark Ross for able assistance with the sampling at sea. J. Pearce, R. Stern, T. Elliott and M. Wilson are gratefully acknowledged for their extremely thorough and constructive reviews. This work was funded in part by the Deutsche Forschungsgemeinschaft (DFG) and forms part of the British Antarctic Survey’s Oceanic Active Margins project. REFERENCES Alvarez, W. (1982). Geological evidence for the geographical pattern of mantle return flow and the driving mechanism of plate tectonics. Journal of Geophysical Research 87, 6697–6710. Baker, P. E. (1968). Comparative volcanology and petrology of the Atlantic islands arcs. Bulletin Volcanologique 32, 189–206. Baker, P. E. (1990). South Sandwich Islands. In: LeMasurier, W. E. & Thomson, J. W. (eds) Volcanoes of the Antarctic Plate and Southern Oceans. American Geophysical Union, Antarctic Research Series 48, 361–395. Barker, P. F. (1995). Tectonic framework of the East Scotia Sea. In: Taylor, B. (ed.) Backarc Basins: Tectonics and Magmatism. New York: Plenum, pp. 281–314. Barker, P. F. & Lawver, L. A. (1988). South American–Antarctic plate motion over the past 50 Myr, and the evolution of the South American–Antarctic ridge. Geophysical Journal 94, 377–386. Barreiro, B. (1983). Lead isotopic compositions of South Sandwich island volcanic rocks and their bearing on magmagenesis in intraoceanic island arcs. Geochimica et Cosmochimica Acta 47, 817–822. Ben Othman, D., White, W. M. & Patchett, J. (1989). The geochemistry of marine sediments, island arc magma genesis, and crust–mantle recycling. Earth and Planetary Science Letters 94, 1–21. Brenan, J. M., Shaw, H. F., Ryerson, F. J. & Phinney, D. L. (1995). Mineral–aqueous fluid partitioning of trace elements at 900°C and 2·0 GPa: constraints on the trace element chemistry of mantle and deep crustal fluids. Geochimica et Cosmochimica Acta 59, 3331–3350. Brett, C. P. (1977). Seismicity of the South Sandwich Islands region. Geophysical Journal of the Royal Astronomical Society 51, 453–464. Bruguier, N. J. & Livermore, R. A. (2001). Enhanced magma supply at the southern East Scotia Ridge: evidence for mantle flow around the subducting slab? Earth and Planetary Science Letters 191, 129–144. Castillo, P. R., Natland, J. H., Niu, Y. & Lonsdale, P. F. (1998). Sr, Nd and Pb isotopic variation along the Pacific–Antarctic risecrest, 53–57°S: implications for the composition and dynamics of the South Pacific upper mantle. Earth and Planetary Science Letters 1...
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