Upper Pleistocene uplifted shorelines as tracers of (local rather than global) subduction dynamics - Archive ouverte HAL Access content directly
Journal Articles Journal of Geodynamics Year : 2014

Upper Pleistocene uplifted shorelines as tracers of (local rather than global) subduction dynamics

H. Henry
Kevin Pedoja
J. Martinod
C. Witt
  • Function : Author
  • PersonId : 965539

Abstract

Past studies have shown that high coastal uplift rates are restricted to active areas, especially in a subduction context. The origin of coastal uplift in subduction zones, however, has not yet been globally investigated. Quaternary shorelines correlated to the last interglacial maximum (MIS 5e) were defined as a global tectonic benchmark (Pedoja et al. (2011)). In order to investigate the relationships between the vertical motion and the subduction dynamic parameters, we cross-linked this coastal uplift database with the "geodynamical" databases from Heuret (2005), Conrad and Husson (2009) and Müller et al. (2008). Our statistical study shows that: [1] the most intuitive parameters one can think responsible for coastal uplift (e.g., subduction obliquity, trench motion, oceanic crust age, interplate friction and force, convergence variation, dynamic topography, overriding and subducted plate velocity) are not related with the uplift (and its magnitude); [2] the only intuitive parameter is the distance to the trench which shows in specific areas a decrease from the trench up to a distance of ~300 km; [3] the slab dip (especially the deep slab dip), the position along the trench and the overriding plate tectonic regime are correlated with the coastal uplift, probably reflecting transient changes in subduction parameters. Finally we conclude that the first order parameter explaining coastal uplift is small-scale heterogeneities of the subducting plate, as for instance subducting aseismic ridges. The influence of large-scale geodynamic setting of subduction zones is secondary.

Domains

Geomorphology
Fichier principal
Vignette du fichier
henryterraces_v2.pdf (864.93 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00968538 , version 1 (01-04-2014)

Identifiers

Cite

H. Henry, V. Regard, Kevin Pedoja, L. Husson, J. Martinod, et al.. Upper Pleistocene uplifted shorelines as tracers of (local rather than global) subduction dynamics. Journal of Geodynamics, 2014, 78, pp.8-20. ⟨10.1016/j.jog.2014.04.001⟩. ⟨hal-00968538⟩
602 View
242 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More