Geodynamics of trench advance: Insights from a Philippine-Sea-style geometry

Hana Čížková*, Craig R. Bina

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

For terrestrial parameter sets, trench retreat is found to be nearly ubiquitous and trench advance quite rare, largely due to rheological and ridge-push effects. Recently updated analyses of global plate motions indicate that significant trench advance is also rare on Earth, being largely restricted to the Marianas-Izu-Bonin arc. Thus, we explore conditions necessary for terrestrial trench advance through dynamical models involving the unusual geometry of the Philippine Sea region. In this subduction system, a slab-pull force from distal subduction is transmitted to the overriding plate at the Pacific trench. Our 2D modeling demonstrates that trench advance can occur for terrestrial rheologies in such special geometries. We observe persistent trench advance punctuated by two episodes of back-arc extension. Characteristic features of the model, such as time interval between extensional episodes, high back-arc heat flow, and stress state of Philippine plate correspond to processes recorded in the region.

Original languageEnglish (US)
Pages (from-to)408-415
Number of pages8
JournalEarth and Planetary Science Letters
Volume430
DOIs
StatePublished - Nov 15 2015

Keywords

  • Marianas-Izu-Bonin
  • Philippine Sea
  • Slab buckling
  • Subduction
  • Transition zone
  • Trench migration

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Geodynamics of trench advance: Insights from a Philippine-Sea-style geometry'. Together they form a unique fingerprint.

Cite this