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BASINS RELATED SUBDUCTIONS (DEEP-SEA TRENCH FLOORS (Composed of descending…
BASINS RELATED SUBDUCTIONS
DEEP-SEA TRENCH FLOORS
Composed of descending oceanic crust
Deepest elongate basins in globe
Do not subside
FOREARC BASINS
Occur between the trench slope and magmatic front of the arc
Subtrata consists of transitional oceanic crust older than magmatic arc
Very subsidence and sedimentation rate
BACKARC BASINS
Formed by rifting and ocean spreading either landward or island arc, or between 2 island arcs
Sedimentary fill reflects magmatic activity in the arc region
RETROARC BASINS
Occur in hinterland of an arc region
Affect large areas on continental crust
Limited subsidence
REMNANT BASINS
Collision of continents leads to zones of crustal over thrusting or underthrusting
Along strike smaller oceanic basins remain
Tend to collect large volumes of sediment from nearby rising areas
PANNONIAN BASINS
Originates between 2 fold-thrust zones
Floored by thinning continental or transitional crust
FORELAND BASINS
Generated by depressing and flexuring the continental crust in front of a fold-thrust belt
Asymmetric basins length increases with time
Influx of clastic material from the rising mountain often keep pace with subsidence and thus causes basin filling