Plate acceleration: The obduction trigger?

Details Plate acceleration: The obduction trigger? Plate acceleration: The obduction trigger?

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.258..428a&link_type=abstract

Earth and Planetary Science Letters, Volume 258, Issue 3-4, p. 428-441.

Physics

8

Scientific paper

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.

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