Abstract
The presence of magmatism and intermediate-depth (70–300 km deep) seismicity at subduction zones is at first sight surprising. Magmatism is unexpected because the subduction of cool oceanic lithosphere makes these regions the coldest in the mantle. The current model for subduction-zone magmatism is that water released from the subducting slab enters the relatively warm mantle wedge, leading to a reduction in melting temperature and magmatism1,2,3,4. But there is a problem with this scheme because it is thought that water cannot leave the slab by porous flow to enter the wedge. The occurrence of intermediate-depth earthquakes is surprising because of the inhibitory effect of the very high frictional stress on faults expected from the high pressure at these depths. One proposal put forward to explain intermediate-depth seismicity is that high pore-pressure might facilitate faulting by decreasing the friction5,6,7. The hypothesis presented here is that non-percolating water provides the high pore-pressure, that the consequent faulting temporarily interconnects the water pores and, when a sufficient vertical height of water is interconnected, a hydrofracture is produced which transports the water out into the mantle wedge, thereby generating subduction-zone magmatism.
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References
Gill, J. Orogenic Andesites and Plate Tectonics (Springer, Berlin, 1981).
Tatsumi, Y. & Eggins, S. Subduction Zone Magmatism (Blackwell, Cambridge, MA, 1995).
Pearce, J. A. & Peate, D. W. Tectonic implications of the composition of volcanic arc magmas. Annu. Rev. Earth Planet. Sci. 23, 251–285 (1995).
Davies, J. H. & Stevenson, D. J. Physical model of source region of subduction zone volcanics. J. Geophys. Res. 97, 2037–2070 (1992).
Hubbert, M. K. & Rubey, W. W. Role of fluid pressure in mechanics of overthrust faulting I. Mechanics of fluid-filled porous solids and its application to overthrust faulting. Geol. Soc. Am. Bull. 70, 115–206 (1959).
Green, H. W. & Houston, H. The mechanics of deep earthquakes. Annu. Rev. Earth Planet. Sci. 23, 169–213 (1995).
Kirby, S., Engdahl, E. R. & Denlinger, R. in Subduction: Top to Bottom (eds Bebout, G. E., Scholl, D. W., Kirby, S. H. & Platt, J. P.) 195–214 (Am. Geophys. Union, Washington DC, 1996)
Davies, J. H. in Magmatic Systems (ed. Ryan, M. P.) 197–221 (Academic, San Diego, 1994).
Watson, B. E. & Brenan, J. M. Fluids in the lithosphere, Part 1: Experimentally-determined wetting characteristics of CO2 –H2O fluids and their implications for fluid transport, host-rock physical properties and fluid inclusion formation. Earth Planet. Sci. Lett. 85, 497–515 (1987).
Watson, E. B., Brenan, J. M. & Baker, D. R. in Continental Mantle (ed. Menzies, M. A.) 111–125 (Clarendon, Oxford, 1990).
Watson, E. B. & Lupulescu, A. Aqueous fluid connectivity and chemical transport in clinopyroxene-rich rocks. Earth Planet. Sci. Lett. 117, 279–294 (1993).
Elliott, M. T. The Three-dimensional Numerical Simulation of Crystallizing Media. Thesis, Univ. Liverpool 1998).
Waff, H. S. & Bulau, J. R. Equilibrium fluid distribution in an ultramafic partial melt under hydrostatic stress conditions. J. Geophys. Res. 84, 6109–6114 (1979).
Wong, T.-f., Ko, S.-c. & Olgaard, D. L. Generation and maintenance of pore pressure excess in a dehydrating system 2. Theoretical analysis. J. Geophys. Res. 102, 841–852 (1997).
Nakashima, Y. Buoyancy-driven propagation of an isolated fluid-filled crack in rock: Implications for fluid transport in metamorphism. Contrib. Mineral. Petrol. 114, 289–295 (1993).
Nishiyama, T. Kinetics of hydrofracturing and metamorphic veining. Geology 17, 1068–1071 (1989).
Knapp, R. B. & Knight, J. E. Differential thermal expansion of pore fluids: Fracture propagation and microearthquake production in hot pluton environments. J. Geophys. Res. 82, 2515–2522 (1977).
Connolly, J. A. D. Devolatilization-generated fluid pressure and deformation-propagated fluid flow during prograde regional metamorphism. J. Geophys. Res. 102, 18149–18173 (1997).
Raleigh, C. B. & Paterson, M. S. Experimental deformation of serpentinite and its tectonic implications. J. Geophys. Res. 70, 3965–3985 (1965).
Kirby, S. H. Intraslab earthquakes and phase changes in subducting lithosphere. Rev. Geophys. (suppl.) U.S. National Report to the I.U.G.G. 1990–1994, 287–297 (1995).
Meade, C. & Jeanloz, R. Deep-focus earthquakes and recycling of water into the Earth's mantle. Science 252, 68–72 (1991).
Lockner, D. A., Byerlee, J. D., Kuksenko, V., Ponomarev, A. & Sidorin, A. Quasi-static fault growth and shear fracture energy in granite. Nature 350, 39–42 (1991).
Du, Y. & Aydin, A. Interaction of multiple cracks and formation of echelon crack arrays. Int. J. Numerical Anal. Meth. Geomech. 15, 205–218 (1991).
Horii, H. & Nemat-Nasser, S. Compression-induced microcrack growth in brittle solids: axial splitting and shear fracture. J. Geophys. Res. 90, 3105–3125 (1985).
Teufel, L. W. in Mechanical Behavior of Crustal Rocks, The Handin Volume (eds Carter, N. L., Friedman, M., Logan, J. M. & Stearns, D. W.) 135–145 (Am. Geophys. Union, Washington DC, 1981).
Sibson, R. H. Implications of fault-valve behaviour for rupture nucleation and recurrence. Tectonophysics 211, 283–293 (1992).
Ferry, J. M. Ahistorical review of metamorphic fluid flow. J. Geophys. Res. 99, 15487–15498 (1994).
McCaig, A. M. Deep fluid circulation in fault zones. Geology 16, 867–870 (1988).
Philippot, P. & Selverstone, J. Trace-element-rich brines in eclogitic veins: implications for fluid composition and transport during subduction. Contrib. Mineral. Petrol. 106, 417–430 (1991).
Barnicoat, A. C. & Cartwright, I. Focused fluid flow during subduction: Oxygen isotope data from high-pressure ophiolites of the western Alps. Earth Planet. Sci. Lett. 132, 53–61 (1995).
Hoogerduijn Strating, E. H. & Vissers, R. L. M. Dehydration-induced fracturing of eclogite-facies peridotites: implications for the mechanical behaviour of subducting oceanic lithosphere. Tectonophysics 200, 187–198 (1991).
Rubin, A. M. Propagation of magma-filled cracks. Annu. Rev. Earth Planet. Sci. 23, 287–336 (1995).
Fialko, Y. A. & Rubin, A. M. Numerical simulation of high-pressure rock tensile fracture experiments: Evidence of an increase in fracture energy with pressure? J. Geophys. Res. 102, 5231–5242 (1997).
Apperson, K. D. & Frohlich, C. The relationship between Wadati-Benioff Zone geometry and P, T and B axes of intermediate and deep focus earthquakes. J. Geophys. Res. 92, 13821–13831 (1987).
Elliott, T., Plank, T., Zindler, A., White, W. & Bourdon, B. Element transport from slab to volcanic front at the Mariana arc. J. Geophys. Res. 102, 14991–15019 (1997).
Hawkesworth, C. J., Gallagher, K., Hergt, J. M. & McDermott, F. Trace element fractionation processes in the generation of island arc basalts. Phil. Trans. R. Soc. Lond. A 342, 171–191 (1993).
Poli, S. & Schmidt, M. W. H2O transport and release in subduction zones: Experimental constraints on basaltic and andesitic systems. J. Geophys. Res. 100, 22299–22314 (1995).
Rubin, A. M. & Gillard, D. Dike-induced earthquakes: Theoretical considerations. J. Geophys. Res. 103, 10017–10030 (1998).
Acknowledgements
I thank M. Cheadle and T. Elliott for discussions, and S. Kirby and B. Minarik for comments and suggestions.
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Davies, J. The role of hydraulic fractures and intermediate-depth earthquakes in generating subduction-zone magmatism. Nature 398, 142–145 (1999). https://doi.org/10.1038/18202
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DOI: https://doi.org/10.1038/18202
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