Subduction Tectonics/Active Margin Evolution Peter Clift.

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Presentation transcript:

Subduction Tectonics/Active Margin Evolution Peter Clift

Philippine Sea Plate, Subduction Initiation Casey and Dewey (1984)

Bloomer et al. (1995) Subduction Initiation

Initiation at a fracture zone Casey and Dewey (1984)

Collapse at the ridge crest?

Forces that resist subduction initiation McKenzie, 1977

Flow of asthenosphere into a crack? Turcotte et al. (1977)

Boninites Pearce and Parkinson (1993)

Metamorphic soles Jones et al. (1991) Pindos Mountains, Greece

Anatomy of an intra-oceanic arc

Subduction seismicity

Subduction polarity flip

Aegean Seismicity - backarc extension

Angle of descent, controling factors? Isacks and Molnar (1971)

Stresses in the descending slab. Isacks and Molnar (1969 )

Backarc rifting-Izu-Bonin Arc

Backarc rifting-Tonga: location of rift axis?

Magmatic variations during backarc rifting

En-echelon spreading axes, Havre Trough

Rift-drift transition in backarcs

Propagating rifts in backarc basins

Hydrothermalism in backarc basins

Different basement types and styles of hydrothermalism

Effect of seamount collision on arc magmatism. Magmatic gap?

Subduction erosion in Tonga

Tonga Forearc Subsidence

Perched basins on an erosive plate margin

Tonga fore-arc trench slope basin

Paired metamorphic belts