Hall, Chad E. and Gurnis, Michael and Sdrolias, Maria and Lavier, Luc L. and Müller, R. Dietmar (2003) Catastrophic initiation of subduction following forced convergence across fracture zones. Earth and Planetary Science Letters, 212 (1-2). pp. 15-30. ISSN 0012-821X http://resolver.caltech.edu/CaltechAUTHORS:20121120-142052670
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Although the formation of subduction zones plays a central role in plate evolution, the processes and geological settings that lead to the initiation of subduction are poorly understood. Using a visco-elastoplastic model, we show that a fracture zone could be converted into a self-sustaining subduction zone after approximately 100 km of convergence. Modeled initiation is accompanied by rapid extension of the over-riding plate and explains the inferred catastrophic boninitic volcanism associated with Eocene initiation of the Izu-Bonin-Mariana (IBM) subduction zone. Using global plate reconstructions, we suggest that IBM nucleation was associated with a change in plate motion between 55 and 45 Ma. We estimate that the forces resisting IBM subduction initiation were substantially smaller than available driving forces.
|Additional Information:||© 2003 Elsevier Science B.V. Received 20 December 2002; received in revised form 22 April 2003; accepted 29 April 2003. We thank Y. Podladchikov and A. Poliakov for sharing their PARAZOV program. Reviews by D. Blackman, R. Stern, and S. Zhong greatly clarified the manuscript. This work was supported by NSF Grants EAR-0003558 and EAR-0107137, and is Contribution No. 8944 of the Seismological Laboratory.|
|Subject Keywords:||subduction; initiation; fracture zones; Bonin Arc; Izu Arc; Mariana Trough|
|Other Numbering System:|
|Official Citation:||Chad E. Hall, Michael Gurnis, Maria Sdrolias, Luc L. Lavier, R.Dietmar Müller, Catastrophic initiation of subduction following forced convergence across fracture zones, Earth and Planetary Science Letters, Volume 212, Issues 1–2, 15 July 2003, Pages 15-30, ISSN 0012-821X, 10.1016/S0012-821X(03)00242-5.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||21 Nov 2012 22:03|
|Last Modified:||27 Dec 2012 03:02|
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