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Journal Articles Earth and Planetary Science Letters Year : 2007

Plate acceleration: The obduction trigger?

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Philippe Agard
  • Function : Correspondent author
Laurent Jolivet
Bruno Vrielynck
  • Function : Author
  • PersonId : 849186
Evgenii E.B. Burov
Patrick Monie

Abstract

Obduction processes, though spectacular (dense oceanic ophiolites are emplaced on top of light, continental rocks along thousands of km), have been little elucidated since the advent of plate tectonics. Based on convergence velocities and blueschist formation, we show that the two recent large-scale, Upper Jurassic and Upper Cretaceous obductions coincided with periods during which velocities increased abruptly and more than doubled. The latter obduction also modified the interplate coupling across adjacent subduction zones. We critically propose a mechanism in which large-scale obductions are triggered by intraplate instabilities resulting from sharp plate accelerations, possibly in response to superplume events

Dates and versions

hal-00407960 , version 1 (28-07-2009)

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Philippe Agard, Laurent Jolivet, Bruno Vrielynck, Evgenii E.B. Burov, Patrick Monie. Plate acceleration: The obduction trigger?. Earth and Planetary Science Letters, 2007, 258 (3-4), pp.428-441. ⟨10.1016/j.epsl.2007.04.002⟩. ⟨hal-00407960⟩
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