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- W2170969682 endingPage "1061" @default.
- W2170969682 startingPage "1049" @default.
- W2170969682 abstract "Trench‐arc systems (subduction zones) can be classified into two types depending on whether or not actively opening back‐arc basins are associated with them. This suggests that subduction of an oceanic plate is not a sufficient condition for back‐arc opening, though it may be necessary one. Mechanisms that cause the distinction between the two types have been investigated. Earthquake studies suggest that there is a significant difference in the mode of plate motion at interplate boundaries between the two types of trench‐arc systems. Extreme cases are Chile, where plate motion is seismic, and the Marianas arc, where it is aseismic. This difference seems to indicate that the stress state in the back‐arc area differs between the two types: compression in the Chilean type and tension in the Marianas type. This difference in the stress state is also manifested in other tectonic features, such as topography, gravity, volcanic activity, and crustal movement. Two possible mechanisms for the difference between the two types are suggested: (1) The nature of the contact zone between upper and lower plates changes from tight coupling (Chile) to decoupling (the Marianas) through the evolutionary process of subduction. The decoupling results in an oceanward retreat of the trench and back‐arc opening. (2) The downgoing slab is anchored to the mantle, so that the position of a trench is also fixed with respect to the mantle. Since the motion in the mantle is slow compared to that of surface plates, it is the motion of the landward plate which controls the opening and nonopening of back‐arcs." @default.
- W2170969682 created "2016-06-24" @default.
- W2170969682 creator A5001452413 @default.
- W2170969682 creator A5081436741 @default.
- W2170969682 date "1979-03-10" @default.
- W2170969682 modified "2023-10-12" @default.
- W2170969682 title "Back‐arc opening and the mode of subduction" @default.
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