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The Osbourn Seamount is a seamount in the … The Osbourn Seamount is a seamount in the south-west Pacific Ocean. It is the westernmost and oldest unsubducted seamount of the Louisville Ridge, with an estimated age of 78.8 ± 1.3 Ma. Like other seamounts comprising the Louisville Ridge, it was formed by the Louisville hotspot which is currently located 4,300 km (2,700 mi) away near the Pacific-Antarctic Ridge. Osbourn Seamount will eventually be destroyed by subduction in the Tonga and Kermadec trenches once it is carried into the trenches by the ongoing plate motion. The trench-chain collision zone is moving southward at a rate of 200 km (120 mi)/Ma because of the oblique angle between the trench and the Louisville chain. This further shortens the seamount's lifespan.The flat top of the seamount is currently tilting down toward the trench because the seamount is sitting on the edge of the trench where the Australian Plate is being bent by subduction. A bathymetric high c. 2 km (1.2 mi) north-west of the Osbourn Seamount has been interpreted as the currently subducting portion of the Louisville chain, but this continuation is not aligned with the existent chain. The Osbourn Seamount is the same age as the Detroit Seamount (75.8±0.6 Ma), one of the oldest of the Hawaii–Emperor seamount chain, and a clockwise bend in the Louisville chain near Osbourn is similar to the Detroit-Meiji bend in the Hawaii–Emperor chain.it-Meiji bend in the Hawaii–Emperor chain.
, La montagna sottomarina di Osbourn è la pi … La montagna sottomarina di Osbourn è la più antica montagna della catena sottomarina di Louisville, con un'età stimata di 77,3 milioni di anni. La montagna, situata nell'estremità occidentale della catena, è a tutti gli effetti un guyot e la sua piatta sommità è attraversata da diverse linee di faglia. Così come l'intera catena sottomarina di Louisville, anche questo rilievo ha avuto origine dal punto caldo di Louisville. La montagna sottomarina di Osbourn sarà un giorno distrutta a causa della subduzione della placca pacifica su cui la montagna giace, che la sta portando verso le fosse di Tonga e delle Kermadec. Supponendo costante l'attuale velocità del moto della placca, tutto ciò avverrà, naturalmente, tra diversi milioni di anni.naturalmente, tra diversi milioni di anni.
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La montagna sottomarina di Osbourn è la pi … La montagna sottomarina di Osbourn è la più antica montagna della catena sottomarina di Louisville, con un'età stimata di 77,3 milioni di anni. La montagna, situata nell'estremità occidentale della catena, è a tutti gli effetti un guyot e la sua piatta sommità è attraversata da diverse linee di faglia. Così come l'intera catena sottomarina di Louisville, anche questo rilievo ha avuto origine dal punto caldo di Louisville.uto origine dal punto caldo di Louisville.
, The Osbourn Seamount is a seamount in the … The Osbourn Seamount is a seamount in the south-west Pacific Ocean. It is the westernmost and oldest unsubducted seamount of the Louisville Ridge, with an estimated age of 78.8 ± 1.3 Ma. Like other seamounts comprising the Louisville Ridge, it was formed by the Louisville hotspot which is currently located 4,300 km (2,700 mi) away near the Pacific-Antarctic Ridge.mi) away near the Pacific-Antarctic Ridge.
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Montagna sottomarina di Osbourn
, Osbourn Seamount
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