Abstract
Lineated magnetic anomalies indistinguishable from those generated at mid-oceanic ridges have been found behind many subduction zones. They show that back-arc spreading, like its mid-oceanic counterpart, is to a first approximation symmetric. Nevertheless, consistently asymmetric spreading has been found in some ocean basins, and in both actively spreading and extinct back-arc basins. We argue here that the sense of asymmetry found in active back-arc basins strongly supports a mechanism for the origin of asymmetric spreading which is dominated by the thermal effects of migration of the ridge crest over the sub-asthenospheric mantle. Conversely, it provides no support for the simple fluid mechanical models, nor for models in which back-arc extension is driven directly by the subduction process. If the thermal effect also dominated asymmetric spreading in extinct back-arc basins, the sense of asymmetry would provide information about ‘absolute’ plate motions at the time of opening.
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References
Hayes, D. E. Bull. geol. Soc. Am. 87, 994–1002 (1976).
Weissel, J. K. & Hayes, D. E. in Antarctic Research Series Vol. 19, 165–196 (American Geophysical Union. Washington, DC, 1972).
Barker, P. F. Geophys. J. R. astr. Soc. 59, 131–145 (1979).
Macdonald, K. C. Bull. geol. Soc. Am. 88, 541–555 (1977).
Karig, D. E. in Init. Rep. DSDP Leg 31, 857–879 (1975).
Watts, A. B., Weissel, J. K. & Larson, R. L. Tectonophysics 37, 167–181 (1977).
Hey, R., Johnson, G. L. & Lowrie, A. Bull. geol. Soc. Am. 88, 1385–1403 (1977).
Hey, R. Bull. geol. Soc. Am. 88, 1404–1420 (1977).
Lonsdale, P. & Klitgord, K. D. Bull. geol. Soc. Am. 89, 981–999 (1978).
Hey, R. Geology 7, 504–506 (1979).
Elvers, D., Srivastava, S. P., Potter, K., Morley, J. & Seidel, D. Earth planet. Sci. Lett. 20, 211–219 (1973).
Sclater, J. G. & Francheteau, J. Geophys. J.R. astr. Soc. 20, 509–542 (1970).
Stein, S., Melosh, H. J. & Minster, J. B. Earth planet. Sci. Lett. 36, 51–62 (1977).
Chase, C. G. Earth planet. Sci. Lett. 37, 355–368 (1978).
Minster, J. B. & Jordan, T. H. J. geophys. Res. 83, 5351–5354 (1978).
Solomon, S. C., Sleep, N. H. & Richardson, R. M. Geophys. J.R. astr. Soc. 42, 769–801 (1975).
Toksoz, M. N. & Bird, P. in Maurice Ewing Series Vol. 1, 379–393 (American Geophysical Union, Washington DC, 1977).
Barker, P. F. Earth planet. Sci. Lett. 15, 123–132 (1972).
Taylor, B. Geology, 7, 171–174 (1979).
Weissel, J. K. in Maurice Ewing Series Vol. 1, 429–436 (American Geophysical Union, Washington DC, 1977).
Karig, D. E., Anderson, R. N. & Bibee, L. D. J. geophys. Res. 83, 1213–1226 (1978).
Forsyth, D. W. J. geophys. Res. 80, 1429–1443 (1975).
Weissel, J. K. & Anderson, R. N. Earth planet. Sci. Lett. 41, 143–158 (1978).
Chase, C. G. J. geophys. Res. 83, 5385–5387 (1978).
Hill, I. A. & Barker, P. F. Geophys. J.R. astr. Soc. (in the press).
Barker, P. F. & Burrell, J. Mar. Geol. 25, 15–34 (1977).
Barker, P. F., Hill, I. A., Weaver, S. D. & Pankhurst, R. J. in Antarctic Geoscience (University of Wisconsin Press, Madison, in the press).
Ludwig, W. J., Windisch, C. C., Houtz, R. E. & Ewing, J. I. in Am. Ass. petrol. Geol. Mem. 29, 125–137 (1979).
Shih, T. Int. Rep. DSDP (in the press).
Solomon, S. C., Sleep, N. H. & Jurdy, D. M. J. geophys. Res. 82, 203–212 (1977).
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Barker, P., Hill, I. Asymmetric spreading in back-arc basins. Nature 285, 652–654 (1980). https://doi.org/10.1038/285652a0
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DOI: https://doi.org/10.1038/285652a0
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