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Proterozoic crustal extension and the generation of dome-and-keel structure in an Archaean granite–greenstone terrane


ARCHAEAN granite–greenstone terranes1–3 in which narrow belts of 'greenstone' (ultramafic and mafic volcanics) and overlying sedimentary rocks occur in association with broad provinces of 'granite' (granitic igneous rocks, gneiss and migmatite), have long puzzled geologists because of the lack of any clear modern analogues. Not only is there uncertainty about how the greenstone formed in the first place4–6 but there is continuing debate about how and when the terranes developed their distinctive structural and metamorphic architecture. Many granite–greenstone terranes display a dome-and-keel geometry, in which belts of supracrustal (volcanic and sedimentary) rocks occur as structural troughs wedged between dome-shaped bodies of the granite–gneiss–migmatite complex. A metamorphic aureole typically occurs in the supracrustals adjacent to their contact with the domes, and the contact itself is a shear zone. Here we report the results of field studies of a granite–greenstone terrane in Brazil, showing that this architecture originated during the Proterozoic, more than 500 million years after extrusion of the greenstone. We suggest that the thermal regime and deformation kinematics necessary to create this architecture could be generated during an episode of crustal extension, when hot basement rocks were transported upwards along a transcrustal normal fault system to the base of the supracrustals.

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  1. Anhaeusser, C. R., Mason, R., Viljoen, M. J. & Viljoen, R. P. Geol. Soc. Am. Bull. 80, 2175–2200 (1969).

    Article  ADS  Google Scholar 

  2. Goodwin, A. M. Precambrian Geology: The Dynamic Evolution of the Continental Crust (Academic, London, 1991).

    Google Scholar 

  3. Platt, J. P. Tectonophysics 65, 127–150 (1980).

    Article  ADS  Google Scholar 

  4. Boulter, C. A., Bickle, M. J., Gibson, B., & Wright, R. K. Precamb. Res. 36, 241–258 (1987).

    Article  ADS  Google Scholar 

  5. Swager, C. & Griffin, T. J. Precamb. Res. 48, 63–73 (1990).

    Article  ADS  Google Scholar 

  6. Kröner, A. in Precambrian Plate Tectonics (ed. Kröner, A.) 57–90 (Elsevier, Amsterdam, 1981).

    Google Scholar 

  7. Dorr, J. V. N. II U.S. Geol. Surv. Prof. Pap. 641-A, 110 (1969).

    Google Scholar 

  8. Almeida, F. F. M. Rev. Bras. Geoci. 7, 349–364 (1977).

    Google Scholar 

  9. Machado, N., Noce, C. M., Oliveira, O. A. B. & Ladeira, E. A. Bol. Soc. Brasil. Geoci. Nucléo Minas Gerais 8, 1–5 (1989).

    Google Scholar 

  10. Babinsky, M., Chemale, F. Jr & Van Schmus, W. R. Bol. Resum. 3rd Congr. Bras. Geoquimica, 628–629 (Socied. Brasil. Geoq., São Paulo, 1991).

  11. Marshak, S. & Alkmim, F. F. Tectonics 8, 555–571 (1989).

    Article  ADS  Google Scholar 

  12. Almeida, F. F. M. & Hasui, Y. in O Precambriano do Brasil (eds Almeida, F. F. M. & Hasui, Y.) 1–5 (Blücher, Saõ Paulo, 1984).

    Google Scholar 

  13. Chemale, F. Jr, Rosiere, C. A. & Endo, I. Rev. Pesquisas Univ. Fed. Rio Grande do Sul (Univ. Fed. Rio Grande do Sul, Porto Alegre, in the press).

  14. Jordt-Evangelista, H., Alkmim, F. F. & Marshak, S. 6th Simp. Geol. Minas Gerais (Revista Escola de Minas (REM), Ouro Preto, in the press).

  15. Marshak, S., Alkmim, F. F. & Evangelista, H. Geol. Soc. Am. Abstr. Programs 23, 308 (1991).

    Google Scholar 

  16. Sandiford, M. & Powell, R. Earth planet. Sci. Lett. 79, 151–158 (1986).

    Article  ADS  Google Scholar 

  17. White, R. S. & McKenzie, D. P. J. geophys. Res. 94, 7685–7730 (1989).

    Article  ADS  Google Scholar 

  18. Lister, G. S., Etheridge, M. A. & Symonds, P. A. Tectonics 10, 1039–1064 (1991).

    Article  ADS  Google Scholar 

  19. Molnar, P. & England, P. J. geophys. Res. 95, 4833–4856 (1990).

    Article  ADS  Google Scholar 

  20. Condie, K. C. Plate Tectonics & Crustal Evolution, 3rd edn (Pergamon, Oxford, 1989).

    Google Scholar 

  21. Schwerdtner, W. M., Morgan, J. & Stott, G. M. Geol. Assoc. Can. Spec. Paper 28, 117–123 (1985).

    Google Scholar 

  22. Fyson, W. K., Herd, R. K. & Ermanovics, I. F. Can. J. Earth. Sci. 15, 1817–1825 (1978).

    Article  ADS  Google Scholar 

  23. Collins, W. J. & Vernon, R. H. Geology 19, 835–838 (1991).

    Article  ADS  Google Scholar 

  24. Houseman, G. A., McKenzie, D. P. & Molnar, P. J. geophys. Res. 86, 6115–6132 (1981).

    Article  ADS  Google Scholar 

  25. Turner, S. & Foden, J. Geol. Soc. Austr. Abstr. 25, 262–263 (1990).

    Google Scholar 

  26. Spencer, J. E. Geology 12, 95–98 (1984).

    Article  ADS  Google Scholar 

  27. Park, R. G. Geol. Rund. 71, 22–37 (1982).

    Article  Google Scholar 

  28. Allen, T. & Chamberlain, C. P. Earth planet. Sci. Lett. 93, 392–404 (1989).

    Article  ADS  Google Scholar 

  29. Gorman, B. E., Pearce, T. H. & Birkett, T. C. Precamb. Res. 6, 23–41 (1978).

    Article  ADS  Google Scholar 

  30. Spry, J. G. J. struct. Geol. 7, 187–203 (1985).

    Article  ADS  Google Scholar 

  31. Hudleston, P. J., Schultz-Ela, D. & Southwick, D. L. Can. J. Earth Sci. 25, 1060–1068 (1988).

    Article  ADS  Google Scholar 

  32. Feng, R. & Kerrich, R. Geology 18, 870–873 (1990).

    Article  ADS  Google Scholar 

  33. Nalini, E. A. Jr & Hippert, J. F. 6th Simp. Geol. Minas Gerais (Revista Escola de Minas (REM), Ouro Preto, in the press).

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Marshak, S., Alkmim, F. & Jordt-Evangelista, H. Proterozoic crustal extension and the generation of dome-and-keel structure in an Archaean granite–greenstone terrane. Nature 357, 491–493 (1992).

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