What is a leading edge tectonic classification?
Leading Edge – Subduction of oceanic crust beneath continental crust at destructive plate margin – narrow continental shelf in front of uplifting coastal mountains – rocky shorelines with limited depositional features (Chile)
Inman and Nordstrom 1971 - based on plate boundary
What is a collision coast?
Lies along a convergent plate boundary. A collisional tectonic setting is one where two plates, regardless of composition, are moving toward one another.
An exception is made for California. Although presently located along a transform boundary the coast of California retain features created during its collision with the Farallon plate which terminated approximately 20 million years ago.
Collision coasts are divided into two parts. What are they and what do they do?
Continental collision coast: A continental margin that is located along collision boundary, such as the west coast of South America.
Island arc collision coast: A coast located along the collision margin of an island arc, such as the islands in the western Pacific.
What is a neo-trailing edge coast?
Coastline developed along the margin of a newly rifting land mass. Immature coastline, topography adjacent to the coast is typically rugged and includes cliffs, mountains, and/or plateaus. Coastlines lack continental shelves because there has not been enough time for depositional features to form.
What is an amero-trailing coast?
Trailing edge coast where the opposite side of the continent is a collision coast. This arrangement directs the drainage and flow of sediment from the collision side to the trailing edge coast. The discharge of large drainage systems, high sediment supplies and maturity of these coasts results in the formation of wide depositional continental shelves (i.e. East Coast of U.S. has sediment thickness' of 10 km or more in some places). Coastline is backed by a wide, relatively flat coastal plain.
what is an afro-trailing edge coast?
Coastal zones of this category face a spreading center, and the opposite side of the continent also faces a spreading center. They typically have moderate to wide continental shelves, and the coast is backed by hills or lowlands. They are tectonically inactive, and have a smaller sediment supply to the coast then do Amero-trailing edge coasts.
What is a marginal sea coast?
Coasts of this character are sheltered from the conditions of the open ocean by other land masses, such as island arcs created by the collision of tectonic plates. They are fronted by wide continental shelves and backed by hilly or low-lying regions frequently present in tectonically inactive areas.
What is an emergent coast?
An emergent coastline is a stretch along the coast that has been exposed by the sea by a relative fall in sea levels by either isostasy or eustasy. Characterised by raised beaches.
What is a submergent coast?
Submergent coastlines are stretches along the coast that have been inundated by the sea by a relative rise in sea levels from either isostacy or eustacy. Characterised by drowned river valleys (rias).
What is a shore platform?
Shore platforms are horizontal or gently sloping surfaces backed by a cliff, eroded in bedrock at the shore. The erosional origin of these surfaces is evident because they cut across and expose geological structures.
What is a bayhead beach?
Bayhead beaches are formed when constructive waves deposit material between two headlands
What is a barrier beach?
A sand ridge that rises slightly above the surface of the sea and runs roughly parallel to the shore, from which it is separated by a lagoon.
What is a spit?
A deposition bar or beach landform off coasts or lake shores. The effect of longshore drift
What is a pocket beach?
Pocket beach is usually a small beach, between two headlands. In an idealized setting, there is very little or no exchange of sediment between the pocket beach and the adjacent shoreline
What is a tombolo?
A deposition landform in which an island is attached to the mainland by a narrow piece of land such as a spit or bar.
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