Tectonic and magmatic response to the subduction of high bathymetric relief

Rosenbaum, Gideon and Mo, Won (2011) Tectonic and magmatic response to the subduction of high bathymetric relief. Gondwana Research, 19 3: 571-582. doi:10.1016/j.gr.2010.10.007


Author Rosenbaum, Gideon
Mo, Won
Title Tectonic and magmatic response to the subduction of high bathymetric relief
Journal name Gondwana Research   Check publisher's open access policy
ISSN 1342-937X
Publication date 2011-04-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.gr.2010.10.007
Volume 19
Issue 3
Start page 571
End page 582
Total pages 12
Editor Richard Glen
Cameroon Quinn
Wenjiao Xiao
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Abstract Subduction of high bathymetric relief, such as aseismic ridges and magmatic plateaus, is considered to be responsible for dramatic changes in the dynamics and kinematics of the subduction zone. For example, the buoyancy of high bathymetric relief is thought to flatten the dip of the subducting slab, modifying the structural and magmatic evolution of the overriding plate and terminating arc volcanism. In addition, the effect of ridge subduction in retreating plate boundaries can inhibit subduction rollback, a process that could locally pin the subduction hinge and lead to the development of cusps and slab tearing. Here we discuss the tectonic response to subduction of high bathymetric relief using examples from the circum-Pacific subduction systems. We demonstrate that flattening of the subduction dip angle is only significant in the eastern Pacific, where the average slab dip angle is relatively shallow. In the western Pacific, in contrast, the average subduction dip angle is steeper and there is no significant flattening of the dip angle in areas of ridge subduction. Subduction of high bathymetric relief in the circum-Pacific is commonly associated with reduced arc volcanism, and in many cases, the area of ridge subduction coincides with a volcanic gap. In the overriding plate, ridge subduction is associated with pronounced changes in the style of deformation, involving uplift, reactivation of basement thrusts, development of orogen-perpendicular tear faults and block rotations leading to oroclinal bending. The discussed characteristic patterns associated with ridge subduction provide important guidelines for reconstructing past plate tectonic processes, and could help constraining the geodynamics of ancient subduction systems.
Keyword Subduction
Aseismic ridges
Magmatism
Overriding plate deformation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 30 October 2010. Special issue - Island Arcs: Their role in growth of accretionary orogens and mineral endowment.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2012 Collection
 
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Created: Tue, 28 Feb 2012, 02:42:40 EST by Ashleigh Paroz on behalf of School of Earth Sciences