| Britannia Guyots | |
|---|---|
  Location of the Britannia Guyots | |
| Summit depth | 421 metres (1,381 ft)[1] |
| Location | |
| Location | To the east of the Gold Coast, Queensland, Australia |
| Group | Tasmantid Seamount Chain |
| Coordinates | 28°17′00″S 155°38′25″E / 28.28333°S 155.64028°E |
| Geology | |
| Type | Guyot |
| History | |
| Discovery date | Named from the British cable ship "Britannia"[1] |
The Britannia Guyots (also known as Britannia Bank, Britannia Tablemount, Britannia Tablemounts, Brittania Guyots or Brittania Tablemounts) are a line of extinct volcanic seamounts in the Tasmantid Seamount Chain.
They are basaltic volcanoes that erupted between 17,600,000 and 20,800,000 years ago,[2] with survey data that indicates they rise about 4,000 m (13,000 ft) above the local sea floor to a minimum depth of 421 m (1,381 ft).[1] The sediments deposited on top of the alkali olivine basalt[2] originate from the early Middle Miocene when the ocean water was tropical to subtropical.[3] They were described as seamounts in 1961.[4]
The waters above it are incorporated in the Central Eastern Marine Park, an Australian marine park.[5]
- ^ a b c "GEBCO Undersea Feature Names Gazetteer".
- ^ a b Eggins, S. M.; Green, David Headley; Falloon, Trevor J. (1991). "The Tasmantid seamounts: Shallow melting and contamination of an EM1 mantle plume". Earth and Planetary Science Letters. 107 (3–4): 448–462. Bibcode:1991E&PSL.107..448E. doi:10.1016/0012-821X(91)90092-V.
- ^ Quilty, Patrick G. (1993). "Tasmantid and Lord Howe seamounts: biostratigraphy and palaeoceanographic significance". Alcheringa: An Australasian Journal of Palaeontology. 17 (1): 27–53. Bibcode:1993Alch...17...27Q. doi:10.1080/03115519308619487.
- ^ Standard, J. C. (1961). "Submarine Geology of the Tasman Sea". Geological Society of America Bulletin. 72 (12): 1777–1788. doi:10.1130/0016-7606(1961)72[1777:SGOTTS]2.0.CO;2.
- ^ "Temperate East Marine Parks Network Management Plan 2018" (PDF). Parks Australia. Retrieved August 16, 2018.