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Leaky transform fault
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Leaky transform fault : ウィキペディア英語版
Leaky transform fault

A leaky transform fault is a transform fault with volcanic activity along a significant portion of its length producing new crust. In addition to the regular strike-slip motion observed at transform boundaries, an oblique extensional component is present, resulting in motion of the plates that is not parallel to the plate boundary. This opens the fault, allowing melt to break through and cool on the ocean floor, producing new crust. This extensional component can come from a slight shift in the position of a plate’s Euler Pole. In order to accommodate oblique motion along the plate boundary, these leaky transform faults can break up into a series of small transforms linked by short segments of spreading ridges. These new transforms will follow small circles centred on the new Euler Pole.
== Case Studies ==
The Western Limassol Forest Complex, an ophiolite assemblage on the island of Cyprus dated to the Late Cretaceous, is believed to have come from a leaky, left-lateral transform fault about wide. Structural deformation of dykes in the ophiolite complex indicate injection into a shearing environment; they trend N-S but are cut by E-W trending shear zones. These intrusions are likely syn-tectonic, as they both pass through and are cut by the shear zones.
The Emerald Fracture Zone (EMZ), located on the boundary of the Antarctic and Pacific plates to the south of New Zealand, is an ideal location to study extensional transform faults. The EMZ is proximal to the Euler Pole for Antarctic plate rotation about the Pacific, producing large effects on the boundary between the two plates as the pole migrated and relative plate velocities changed. 2 main plate boundary reorganizations are evident in the EMZ, linked by large tectonic events. One at 30My, potentially linked to the collision of India and Asia at 35 My, and a second at 6My, potentially linked to the collision of the Ontong Java Plateau with the Melanesian arc at 10My.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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