Abstract
Tectonic plates are formed and move apart at mid-ocean ridges. Some portion of this plate-separation process can occur by stretching of the crust, resulting in a complex pattern of extensional faults. Abyssal hills, the most ubiquitous topographic features on Earth1, are thought to be a product of this faulting2,3. Here we report the results of a self-consistent numerical model of lithospheric formation and stretching that includes spontaneous fault creation. In this model, an axial valley develops where the fault activity is most concentrated. The ‘frozen’ fault-generated topography, rafted out of the axial valley, is visually and statistically similar to observed abyssal hills formed at many slower-spreading ridges. Faults appear to be replaced by new faults because their offset changes the local stress field. We accordingly need no temporal variation in magmatism, as required by some previous models4,5,6, to control the spacing or offset of faults. Our model results suggest instead that the irregularity of abyssal hill relief may result from a self-organized critical stress state at spreading centres.
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References
Menard, H. W. Marine Geology of the Pacific (McGraw-Hill, New York, 1964).
MacDonald, K. C. & Luyendyk, B. Deep-tow studies of the studies of the structure of the Mid-Atlantic Ridge near 37N (FAMOUS). Geol. Soc. Am. Bull. 88, 621–636 (1977).
Shaw, P. R. Ridge segmentation, faulting and crustal thickness in the Atlantic. Nature 358, 490–493 (1992).
Karson, J. A.et al. Along-axis variations in seafloor spreading in the MARK area. Nature 328, 681–685 (1987).
Maliverno, A. & Pockalny, R. A. Abyssal hill topography as an indicator of episodicity in crustal accretion. Earth Planet. Sci. Lett. 99, 154–169 (1990).
Thatcher, W. & Hill, D. P. Asimple model for fault-generated morphology of slow spreading ridges. J.Geophys. Res. 100, 561–570 (1995).
Tapponier, P. & Francheteau, J. Necking of the lithosphere and the mechanics of slowly accreting plate boundaries. J. Geophys. Res. 83, 3955–3970 (1978).
Phipps Morgan, J., Parmentier, E. M. & Lin, J. Mechanisms for the origin of mid-ocean ridge topography: Implications for the thermal and mechanical structure of accreting plate boundaries. J.Geophys. Res. 92, 12823–12836 (1987).
Lin, J. & Parmentier, E. M. Afinite amplitude necking model of rifting in brittle lithosphere. J.Geophys. Res. 95, 4909–4923 (1990).
Chen, Y. & Morgan, W. J. Anonlinear rheology model for mid-ocean ridge axis topography. J.Geophys. Res. 95, 17583–17604 (1990).
Shaw, W. J. & Lin, J. Model of ocean ridge lithospheric deformation: Dependence on crustal thickness, spreading rate, and segmentation. J. Geophys. Res. 101, 17977–17993 (1996).
Kappel, E. S. & Ryan, W. B. F. Volcanic episodicity and non-steady state rift valley along northeast pacific spreading centers: Evidence from Sea MARC I. J. Geophys. Res. 91, 13925–13940 (1986).
Poliakov, A. N. B. & Buck, W. R. in Faulting and Magmatism at Mid-Ocean Ridges (AGU Monograph, Am. Geophys. Union, in the press).
Morton, J. L. & Sleep, N. H. Amid-ocean ridge thermal model: Constraints on the volume of axial hydrothermal flux. J. Geophys. Res. 90, 11345–11353 (1985).
Lin, J. & Parmentier, E. M. Mechanisms of lithosphere extension at mid-ocean ridges. Geophys. J. Int. 96, 1–22 (1989).
Cundall, P. A. Numerical experiments on localization in frictional materials. Ingenieur-Archiv. 59, 148–159 (1989).
Hobbs, B. E., Muhlaus, H. B. & Ord, A. Instability, Softening and Localization of Deformation 143–165 (Spec. Publ. 54, Geol. Soc., London, 1990).
Poliakov, A. N. B. & Herrmann, H. J. Self-organized criticality in plasticity shear bands. Geophys. Res. Lett. 21, 2143–2146 (1994).
Hassani, R. & Chery, J. Control of extensional tectonics by crustal rheology: numerical experiments. Geology 24, 1095–1098 (1996).
Goff, J. A. Near-ridge abyssal hill morphology. J. Geophys. Res. 98, 21713–21737 (1991).
Shemenda, A. L. & Grocholsky, A. L. Physical modeling of slow seafloor spreading. J. Geophys. Res. 99, 9137–9153 (1994).
Forsyth, D. W. Finite extension and low-angle normal faulting. Geology 20, 27–30 (1992).
Buck, W. R. Effect of Lithospheric thickness on the formation of high- and low-angle normal faults. Geology 21, 933–936 (1992).
Poliakov, A. N. B., Hermann, H. G., Podladchikov, Y. & Roux, S. Fractal plastic shear bands. Fractals 2, 567–581 (1994).
Bak, P., Tang, C. & Weisenfeld, K. Self-organized criticality. Phys. Res. A 38, 364–374 (1988).
MacDonald, K. C.et al. Volcanic growth faults and the origin of Pacific abyssal hills. Nature 380, 125–129 (1996).
Buck, W. R. Bending thin lithosphere causes localized “snapping” and not distributed “crunching”: Implications for abyssal hill formation. Geophys. Res. Lett. 24, 2531–2534 (1997).
Cochran, J. R., Sempere, J.-C. & the SEIR Scientific Team The Southeast Indian Ridge between 88°E and 118°E: Gravity anomalies and crustal accretion at intermediate spreading rates. J. Geophys. Res. 102, 15463–15488 (1997).
Gente, P.et al. Characteristics and evolution of the segmentation of the Mid-Atlantic Ridge between 20°N and 24°N during the last 10 million years. Earth Planet. Sci. Lett. 129, 55–72 (1995).
Acknowledgements
We thank J. Lin and J. Goff for reviews. This work was supported by NSF and CNRS.
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Buck, W., Poliakov, A. Abyssal hills formed by stretching oceanic lithosphere. Nature 392, 272–275 (1998). https://doi.org/10.1038/32636
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DOI: https://doi.org/10.1038/32636
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