Opening of the Okinawa basin and collision in Taiwan: a retreating trench model with lateral anchoring

Details Opening of the Okinawa basin and collision in Taiwan: a retreating trench model with lateral anchoring Opening of the Okinawa basin and collision in Taiwan: a retreating trench model with lateral anchoring

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80..145v&link_type=abstract

Earth and Planetary Science Letters, Volume 80, Issue 1-2, p. 145-155.

Physics

22

Scientific paper

Using a two-dimensional finite element model with an elasto-plastic behavior, we show that the opening of the Okinawa basin behind the Ryukyu trench since about 6 Ma can be explained by a retreating trench model with lateral anchoring due to the collision in Taiwan. We assume that a suction force is applied to the edge of the overriding plate. This force corresponds to the difference between the mean lithospheric pressure in the overriding lithosphere and the normal pressure applied to its edge. It results in an outward motion of the edge of the continental margin (retreating trench) and in the opening of the Okinawa basin. If, on the contrary, no suction force is applied, the collision in Taiwan does not result in any extension in the Okinawa area. On both extremities of the Ryukyu trench, this outward motion is locked by the collision in Taiwan and the buoyant subduction of the Palau-Kyushu ridge. It results in the arcuate shape of the Ryukyu arc. In order to explain the actual amount of extension in the Okinawa basin, it is however necessary to take into account the presence of the Miocene volcanic arc which results in a weakened lithosphere. In our model, this weak zone is simulated by a lower yield condition. Finally, the dissymmetry of the Ryukyu arc and Okinawa basin can be explained by a lateral variation of the suction force related to the variation of the length of the subducting slab, thus of the slab pull force.

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