| dbo:abstract |
Tectonic erosion or subduction erosion is the loss of crust from an overriding tectonic plate due to subduction. Two types of tectonic erosion exist: frontal erosion at the outer margin of a plate and basal erosion at the base of the plate's crust. Basal erosion causes a thinning of the overriding plate. When frontal tectonic erosion consumes a crustal block at the outer margin it may induce a domino effect on upper crustal tectonics causing the remaining blocks to fault and tilt to fill the “gap” left by the consumed block. Subduction erosion is believed to be enhanced by high convergence rates and low sediment supply to the trench. Before the Neoproterozoic, subduction erosion rates were probably higher than at present due to higher convergence rates. A scarcity of blueschists from this time seems to support this view. However, this assertion is arguably wrong because the earliest oceanic crust would have contained more magnesium than today's crust and, therefore, would have formed greenschist-like rocks at blueschist facies. The following features and processes have been associated with subduction erosion: * Extensional tectonics: Tectonic erosion is believed be a widespread phenomenon in northern Chile with the normal faulting around Mejillones Peninsula attributed to an extensional domino effect caused by the consumption of a lithospheric block. * Regional subsidence and transgression: The Miocene transgression of southern Chile has been suggested to have been caused by basal tectonic erosion. Subduction erosion does not explain the Miocene transgression further inland in Patagonia. * Magmatic belt migration: Concurrent with the Andean orogeny the eastward migration of the magmatic belts in Chile from the Late Cretaceous onward is thought to be caused by subduction erosion. (en) 俯衝侵蝕（英語：subduction erosion），或構造侵蝕，是由於俯衝而造成上覆構造板塊上的地殼消失。兩種類型的構造侵蝕：板塊前緣侵蝕和板塊地殼底部的基底侵蝕。基底侵蝕導致上覆板塊變薄。前緣侵蝕可能導致連鎖效應的斷層活動和板塊邊緣傾斜，以填補被消耗地殼塊體留下的“缺口”。 高速俯衝和低速沉積物供應到海溝一般被認為能增強俯衝侵蝕。 在新元古代之前，由於收斂速率較高，俯衝侵蝕速率可能高於現在。藍片岩的稀缺似乎支持這種觀點。 然而，這種說法有不同的解釋，因為早期的大洋地殼比今天的地殼含有更多的鎂，因此藍片岩相會被綠片岩相石取代。 (zh) |
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dbr:Mejillones_Peninsula dbr:Convergence_rate dbr:Delamination_(geology) dbr:Domino_effect dbr:Andean_orogeny dbr:Miocene dbr:Crust_(geology) dbr:Crustal_recycling dbr:Magnesium dbr:Fault_(geology) dbr:Volcanic_arc dbr:Patagonia dbr:Norte_Grande dbr:Tectonic_plate dbr:Subduction dbc:Plate_tectonics dbc:Subduction dbr:Late_Cretaceous dbr:Blueschist dbr:Transgression_(geology) dbr:Neoproterozoic dbr:Oceanic_trench dbr:Extensional_tectonics dbr:Oceanic_crust dbr:Subsidence dbr:Normal_fault |
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俯衝侵蝕（英語：subduction erosion），或構造侵蝕，是由於俯衝而造成上覆構造板塊上的地殼消失。兩種類型的構造侵蝕：板塊前緣侵蝕和板塊地殼底部的基底侵蝕。基底侵蝕導致上覆板塊變薄。前緣侵蝕可能導致連鎖效應的斷層活動和板塊邊緣傾斜，以填補被消耗地殼塊體留下的“缺口”。 高速俯衝和低速沉積物供應到海溝一般被認為能增強俯衝侵蝕。 在新元古代之前，由於收斂速率較高，俯衝侵蝕速率可能高於現在。藍片岩的稀缺似乎支持這種觀點。 然而，這種說法有不同的解釋，因為早期的大洋地殼比今天的地殼含有更多的鎂，因此藍片岩相會被綠片岩相石取代。 (zh) Tectonic erosion or subduction erosion is the loss of crust from an overriding tectonic plate due to subduction. Two types of tectonic erosion exist: frontal erosion at the outer margin of a plate and basal erosion at the base of the plate's crust. Basal erosion causes a thinning of the overriding plate. When frontal tectonic erosion consumes a crustal block at the outer margin it may induce a domino effect on upper crustal tectonics causing the remaining blocks to fault and tilt to fill the “gap” left by the consumed block. Subduction erosion is believed to be enhanced by high convergence rates and low sediment supply to the trench. (en) |
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Subduction erosion (en) 俯衝侵蝕 (zh) |
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