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Osbourn Trough information


Osbourn Trough
Fiji
  Lau
Basin
    Tonga-
Kermadec
  Ridge
   Lau-
Colville
  Ridge
Tonga
Trench
Kermadec
Trench
Osbourn Trough
Louisville
Seamount
Chain
Hikurangi
Trough
Wish-
bone
scarp
New Zealand
Osbourn Trough
The major geological relationships of the Osbourn Trough. It defines with the Louisville Ridge intersection the Tonga Trench (violet) to the north and the Kermadec Trench (violet) to the south. Blue represents ocean depths of a kilometer or so and brown shades are shallower. Land is shown in dark green. The black line delineates the continent of Zealandia.

The Osbourn Trough, is a 900 km (560 mi)-long[1] extinct mid-ocean ridge, that may have stopped spreading as recently as 79 million years ago.[2] It is a west-to-east oriented sea floor feature, located to the east of the present Tonga-Kermadec Ridge where the present Pacific Plate is under going subduction under a micro-plate of the Australian Plate. The Osbourn Trough is key to understanding the postulated breakup mechanism of the historic massive Ontong Java-Manihiki-Hikurangi large igneous province (LIP),[1] as it has been shown to be the spreading centre that lead to the separation of the Manihiki Plateau to its north and the Hikurangi Plateau to its south close to New Zealand.[3]

  1. ^ a b Worthington et al. 2006, Abstract
  2. ^ van de Lagemaat et al. 2023, Section 5.1. Dating the end of convergence across the Gondwana margins
  3. ^ Downey et al. 2007, Sections: Abstract, Conclusion

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Osbourn Trough

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Trench Kermadec Trench Osbourn Trough Louisville Seamount Chain Hikurangi Trough Wish- bone scarp New Zealand The Osbourn Trough, is a 900 km (560 mi)-long...

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Tonga Trench

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Colville   Ridge Tonga Trench Kermadec Trench Osbourn Trough Louisville Seamount Chain Hikurangi Trough New Zealand The Tonga Trench is an oceanic trench...

Word Count : 3114

Kermadec Trench

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  Ridge    Lau- Colville   Ridge Tonga Trench Osbourn Trough Louisville Seamount Chain Hikurangi Trough New Zealand The Kermadec Trench is a linear ocean...

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Panthalassa

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block. Spreading along the Pacific-Phoenix ridge ended 83 Ma at the Osbourn Trough at the Tonga-Kermadec Trench. During the Permian, atolls developed near...

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List of largest volcanic eruptions

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Hekinian; Peter Stoffers; Thomas Kuhn; Folkmar Hauff (30 May 2006). "Osbourn Trough: Structure, geochemistry and implications of a mid-Cretaceous paleospreading...

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Wishbone scarp

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scarp   East Wish- bone scarp West Wishbone  scarp     Tonga Trench Osbourn Trough  Kermadec Trench Hikurangi Plateau Chatham Rise The Wishbone scarp is...

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Louisville Ridge

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scarp     Tonga Trench Osbourn Trough  Kermadec Trench Hikurangi Plateau Chatham Rise The oldest volcanic rocks of the chain come from Osbourn Seamount at 78...

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Manihiki Plateau

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margin, the Manihiki Scarp, and separated Manihiki and Hikurangi. The Osbourn Trough is an abandoned spreading centre between Manihiki and Hikurangi. In...

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Hikurangi Plateau

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current best fit Pacific Plate reference frame tectonics model where the Osbourn Trough is modelled as a spreading centre between the Manihiki Plate and the...

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Outline of oceanography

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Louisville Ridge – A chain of over 70 seamounts in the Southwest Pacific Ocean Osbourn Seamount – The westernmost and oldest non-subducted seamount of the Louisville...

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