Thermal modeling of the geometry of subduction with implications for the tectonics of the overriding plate.

Kevin Patrick Furlong, D. S. Chapman, P. W. Alfeld

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The path which subducting lithosphere follows can be broken into three zones: zone I, a subhorizontal region of nearly constant dip near the trench; zone II, a region of rapidly increasing dip; and zone III, a region generally deeper than 125km, again of nearly constant dip. We have modeled the thermal evolution of slabs as they pass through these three zones using the method of lines, a numerical technique well suited to the solution of time dependent partial differential equations. By use of appropriate initial conditions and time dependent boundary conditions we can simulate subduction with variations in age of subducting lithosphere, slab velocities, and paths followed by the slab. Thermal modeling results indicate that the geometry of the slab in region II can be empirically related directly to the thermal structure of the slab in that region and thus indirectly to age and velocity. It follows that low angle subduction can extend several hundred km inland only in cases of high convergent velocities (>15cm yr-1) and old (>120Ma) lithosphere. We further suggest that rapid variations in the convergence velocities can provide an enabling mechanism for back arc spreading while slow changes in convergence velocities and/or age variations in the subducting lithosphere lead to migration of volcanic arcs.-Authors

Original languageEnglish (US)
Pages (from-to)1786-1802
Number of pages17
JournalJournal of Geophysical Research
Volume87
Issue numberB3
DOIs
StatePublished - Jan 1 1982

Fingerprint

slabs
tectonics
Tectonics
slab
subduction
lithosphere
heat
geometry
Geometry
dip
modeling
arcs
thermal evolution
thermal structure
partial differential equations
Partial differential equations
island arc
trench
volcanology
boundary condition

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Oceanography
  • Forestry
  • Aquatic Science
  • Ecology
  • Condensed Matter Physics
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Materials Chemistry
  • Palaeontology

Cite this

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title = "Thermal modeling of the geometry of subduction with implications for the tectonics of the overriding plate.",
abstract = "The path which subducting lithosphere follows can be broken into three zones: zone I, a subhorizontal region of nearly constant dip near the trench; zone II, a region of rapidly increasing dip; and zone III, a region generally deeper than 125km, again of nearly constant dip. We have modeled the thermal evolution of slabs as they pass through these three zones using the method of lines, a numerical technique well suited to the solution of time dependent partial differential equations. By use of appropriate initial conditions and time dependent boundary conditions we can simulate subduction with variations in age of subducting lithosphere, slab velocities, and paths followed by the slab. Thermal modeling results indicate that the geometry of the slab in region II can be empirically related directly to the thermal structure of the slab in that region and thus indirectly to age and velocity. It follows that low angle subduction can extend several hundred km inland only in cases of high convergent velocities (>15cm yr-1) and old (>120Ma) lithosphere. We further suggest that rapid variations in the convergence velocities can provide an enabling mechanism for back arc spreading while slow changes in convergence velocities and/or age variations in the subducting lithosphere lead to migration of volcanic arcs.-Authors",
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Thermal modeling of the geometry of subduction with implications for the tectonics of the overriding plate. / Furlong, Kevin Patrick; Chapman, D. S.; Alfeld, P. W.

In: Journal of Geophysical Research, Vol. 87, No. B3, 01.01.1982, p. 1786-1802.

Research output: Contribution to journalArticle

TY - JOUR

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Y1 - 1982/1/1

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