Earth:Tasmantid Seamount Chain

From HandWiki
Short description: Long chain of seamounts in the South Pacific Ocean
Tasmantid Seamount Chain
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   "title": "Gascoyne Guyot", 
   "description": "Gascoyne Guyot (7.13 Ma) is a member of the Tasmantid Seamount Chain -36.45896,156.40562",
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   "description": "Kimbla Seamount is a member of the Tasmantid Seamount Chain -35.110323,156.475641",
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   "description": "Taupo Bank (10.3 to 11.4 Ma) is a member of the Tasmantid Seamount Chain -33.36667,156.36667",
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  "properties": {
   "title": "Derwent Hunter Guyot", 
   "description": "Derwent Hunter Guyot (16.83 ± 0.1 Ma) is a member of the Tasmantid Seamount Chain -30.63333,155.36667",
   "marker-symbol": "-number", "marker-size": "medium", "marker-color": "#AA1205" },
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   "title": "Stradbroke Seamount", 
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   "title": "Britannia Guyots", 
   "description": "North, (17.6 to 20.8 Ma) Central (23.0 ± 0.2 Ma) and South Britannia Seamounts (21.68 ± 0.17 Ma) are members of the Tasmantid Seamount Chain -28.45,155.46667",
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   "title": "Queensland Guyot", 
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   "title": "Brisbane Guyots", 
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   "title": "Mooloolaba Seamount", 
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   "title": "Moreton Seamount", 
   "description": "North and South Moreton Seamounts are members of the Tasmantid Seamount Chain -25.77968,154.77572",
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   "title": "Recorder Guyots", 
   "description": "North (26.4± 0.2 Ma) and South Recorder (30.0 ± 0.3 Ma) Seamounts  are members of the Tasmantid Seamount Chain -25.16667,154.91667",
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   "title": "Fraser Seamounts", 
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  "properties": {
   "title": "Cato Reef", 
   "description": "Cato Reef.jpgCato Reef (31.25 ± 0.16 Ma) is a coral reef member of the Tasmantid Seamount Chain -23.417,155.367",
   "marker-symbol": "-number", "marker-size": "medium", "marker-color": "#AA1205" },
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   "title": "Wreck Reefs", 
   "description": "Wreck reefs.jpgWreck Reefs (31.7 to 32.9 Ma) is a coral reef member of the Tasmantid Seamount Chain -22.36667,155.5",
   "marker-symbol": "-number", "marker-size": "medium", "marker-color": "#AA1205" },
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, { "type": "Feature", 

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   "title": "Kenn Reef", 
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   "title": "Mellish Reef", 
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|-

|}|250px|upright=1.16]]
Tasmantid Seamount Chain (red - coral reefs, yellow - seamounts if Wikipedia Graph module enabled)
Zealandia, topographic map.jpg
Topographic map of Zealandia that includes the unlabelled Tasmantid Seamount Chain (above the label Australia) off the east of Australia extending from the Coral Sea southwards into the Tasman Sea.
Location
LocationCoral and Tasman seas
Coordinates [ ⚑ ] : 31°00′S 156°00′E / 31°S 156°E / -31; 156
Geology
TypeSeamount chain
Age of rock56–7 Ma[1]

The Tasmantid Seamount Chain (alternatively Tasmantid Seamounts, Tasman Seamounts, Tasman Seamount Chain, Tasmantide Volcanoes or the Tasmantids)[2] is a 2,000 km (1,200 mi) long chain of seamounts in the South Pacific Ocean. The chain consists of over 16 extinct volcanic peaks, many rising more than 4,000 m (13,000 ft) from the seabed.[3][4][5] It is one of the two parallel seamount chains alongside the East Coast of Australia; the Lord Howe and Tasmantid seamount chains both run north-south through parts of the Coral Sea and Tasman Sea. These chains have longitudes of approximately 159°E and 156°E respectively.[6]

Like its neighbour, the Tasmantid Seamount Chain has resulted from the Indo-Australian Plate moving northward over a stationary hotspot.[7] It ranges in age from about 56 to 7 million years old.[3]

Features

The Tasmantid Seamount Chain includes the following named seamounts:

Tasmantid Seamounts
Seamount Location Age[Age note 1] Notes
Gascoyne Seamount [ ⚑ ] 36°41′00″S 156°07′00″E / 36.6833333°S 156.1166667°E / -36.6833333; 156.1166667 7.13 ± 0.07 Ma [8][9][1]
Kimbla Seamount [ ⚑ ] 35°06′37″S 156°28′32″E / 35.110323°S 156.475641°E / -35.110323; 156.475641 [3] [5]
Taupo Bank [ ⚑ ] 33°10′00″S 156°10′00″E / 33.166667°S 156.166667°E / -33.166667; 156.166667 10.3 to 11.4 Ma [8][9]
Barcoo Bank [ ⚑ ] 32°35′00″S 156°15′00″E / 32.58333°S 156.25°E / -32.58333; 156.25 [8]
Derwent Hunter Guyot [ ⚑ ] 30°52′00″S 156°11′00″E / 30.8666667°S 156.1833333°E / -30.8666667; 156.1833333 16.83 ± 0.1 Ma [8][1]
Stradbroke Seamount [ ⚑ ] 29°05′00″S 155°45′00″E / 29.08333°S 155.75°E / -29.08333; 155.75 [8]
Britannia Guyots [ ⚑ ] 28°17′00″S 155°38′00″E / 28.2833333°S 155.6333333°E / -28.2833333; 155.6333333 17.6 to 23 Ma [8][9]North, Central and South Seamounts[3] Central Britannia 23.0± 0.2 Ma, South Britannia age 21.68 ± 0.17 Ma[1]
Queensland Guyot [ ⚑ ] 27°35′00″S 155°11′00″E / 27.5833333°S 155.1833333°E / -27.5833333; 155.1833333 20.9 Ma [8][9]
Brisbane Guyots [ ⚑ ] 26°59′00″S 155°05′00″E / 26.9833333°S 155.0833333°E / -26.9833333; 155.0833333 27.28 ± 0.15 [8]Age is North Brisbane[1] North and South Brisbane Seamounts[3]
Mooloolaba Seamount [ ⚑ ] 26°20′S 154°52′E / 26.33°S 154.87°E / -26.33; 154.87 [5]
Moreton Seamounts [ ⚑ ] 26°01′00″S 154°58′00″E / 26.0166667°S 154.9666667°E / -26.0166667; 154.9666667 [8]North and South Moreton[3]
Recorder Guyots [ ⚑ ] 25°10′00″S 154°55′00″E / 25.16667°S 154.91667°E / -25.16667; 154.91667 26.4 to 30.0 Ma North Recorder is younger[1]Named from the British cable ship "Recorder"[8] North and South Recorder Seamounts[3]
Fraser Seamounts [ ⚑ ] 24°26′00″S 155°17′00″E / 24.4333333°S 155.2833333°E / -24.4333333; 155.2833333 26.4 ± 0.2 Ma [8]Age South Frazer[1] North and South Fraser[3] Not to be confused with Fraser Island.
Cato Reef [ ⚑ ] 23°13′S 155°34′E / 23.217°S 155.567°E / -23.217; 155.567 31.25 ± 0.16 Ma [1][8]Coral reef
Wreck Reefs [ ⚑ ] 22°11′S 155°20′E / 22.183°S 155.333°E / -22.183; 155.333 31.7 to 32.9 Ma [8][1][10]Coral reef
Kenn Reef [ ⚑ ] 21°12′S 155°43′E / 21.2°S 155.717°E / -21.2; 155.717 [8]Coral reef
Mellish Reef [ ⚑ ] 17°25′00″S 155°50′00″E / 17.41667°S 155.83333°E / -17.41667; 155.83333 [8]Most northern coral reef of seamount chain[10]

There is an unnamed seamount between Stradbroke Seamount and Derwent Hunter Guyot and 7 unnamed seamounts in the Coral Sea near Mellish Reef that have been assigned to the chain.[1] Some of the later have age ranges between 37.0 to 50.5 Ma.[1] Also assigned to the chain are two sampled areas of the southern Louisiade Plateau with ages of 56.40 ± 0.60 and 55.00 ± 0.40 Ma respectively that are believed to represent the most northern aspects of the chain.[1]

Geology

The volcanics are saturated tholeiitic to transitional alkali-olivine basalt.[1]

Age note

  1. ↑ Only limited sampling and age studies have been done. Ages are available on some of the eleven dredging samples analysed by Eggins et al.(1991) by K/Ar absolute methodology and some of 32 later samples by the 40Ar39Ar relative methodology. While different specimens from Gascoyne Seamount matched on age, different specimens from Britannia Guyots mismatch by 5 million years odd by the two different methodologies. However adjacant volcanoes can have long eruptive histories. 40Ar39Ar age subsample data as presented in conference proceedings in 2015 is sourced from the appendix published by Douglas(2022).

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 Douglas (Smethurst), Amelia. The East Australian, Tasmantid and Lord Howe volcanoes : exploring the origins of three, contemporaneous, parallel chains of volcanism. (PhD thesis and appendix) (Thesis). doi:10.7488/era/2805. Retrieved 2023-03-30.
  2. ↑ "Marine Gazetteer Placedetails". http://www.marineregions.org/gazetteer.php?p=details&id=34046. Retrieved 2017-02-20. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "Tasmantid Seamounts of Australia". http://www.deepreef.org/projects/149-seamounts.html. Retrieved 2017-02-20. 
  4. ↑ Richards, F. D.; Kalnins, L. M.; Watts, A. B.; Cohen, B. E.; Beaman, R. J. (October 2018). "The Morphology of the Tasmantid Seamounts: Interactions Between Tectonic Inheritance and Magmatic Evolution". Geochemistry, Geophysics, Geosystems 19 (10): 3870–3891. doi:10.1029/2018GC007821. https://www.pure.ed.ac.uk/ws/files/76323834/75325554._Kalnins_Published_AAM.pdf. 
  5. ↑ 5.0 5.1 5.2 Richards, F. D.; Kalnins, L. M.; Watts, A. B.; Cohen, B. E.; Beaman, R. J. (2018). "The Morphology of the Tasmantid Seamounts: Interactions Between Tectonic Inheritance and Magmatic Evolution". Geochemistry, Geophysics, Geosystems. doi:10.1029/2018GC007821. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007821. 
  6. ↑ Van Der Linden, Willem J. M. (1970). "Morphology of the Tasman sea floor". New Zealand Journal of Geology and Geophysics 13: 282–291. doi:10.1080/00288306.1970.10428218. 
  7. ↑ W. J. Morgan and J. P. Morgan. Plate velocities in hotspot reference frame: electronic supplement.
  8. ↑ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 8.11 8.12 8.13 8.14 "GEBCO Undersea Feature Names Gazetteer". https://www.ngdc.noaa.gov/gazetteer/. 
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1016/0012-821X(91)90092-V. https://www.researchgate.net/publication/253465187. 
  10. ↑ 10.0 10.1 "Coral Sea Marine Park - Management Plan 2018". https://parksaustralia.gov.au/marine/pub/plans/coral-sea-management-plan-2018.pdf. Retrieved 2023-03-29. 



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