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How subduction initiates with mechanically unfavorable lithospheric heterogeneities is important and rarely studied. We investigate this with a geodynamic model for the Puysegur Incipient Subduction Zone (PISZ) south of New Zealand. The model incorporates a true free surface, elasto-visco-plastic rheology and phase changes. Our predictions fit the morphology of the Puysegur Trench and Ridge and the deformation history on the overriding plate. We show how a new thrust fault forms and evolves into a smooth subduction interface, and how a preexisting weak zone can become a vertical fault inboard of the thrust fault during subduction initiation, consistent with two-fault system at PISZ. The model suggests that the PISZ may not yet be self-sustaining. We propose that the Snares Zone (or Snares Trough) is caused by plate coupling differences between shallower and deeper parts, the tectonic sliver between two faults experiences strong rotation, and low-density material accumulates beneath the Snares Zone.

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Caltech Authors  

Autor(es)

Mao, Xiaolin -  Gurnis, Michael -  May, Dave A. - 

Id.: 70169262

Versión: 1.0

Estado: Final

Tipo:  application/pdf -  application/pdf - 

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  application/pdf -  application/pdf - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20171030-143556755
[References] https://authors.library.caltech.edu/82786/

Fecha de contribución: 19-ene-2018

Contacto:

Localización:
* Mao, Xiaolin and Gurnis, Michael and May, Dave A. (2017) Subduction initiation with vertical lithospheric heterogeneities and new fault formation. Geophysical Research Letters, 44 (22). pp. 11349-11356. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20171030-143556755

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