Magellan Seamounts
The Magellan Seamounts (also known as Magellan Seamount Group[1] and previously called Magellan Rise[2][3] ) stretch from the Mariana Trench to Ita Mai Tai Guyot.[4] Geological studies have demonstrated unique features with implications on understanding of ocean island basalt volcanism.[5] Contracts exist with the International Seabed Authority to exploit the areas potential mineral wealth.[6]
| Magellan Seamounts | |
|---|---|
Area of Magellan Seamounts (clicking on map enables mouse over of the seamounts) | |
| Location | |
| Location | Pacific Ocean |
| Geology | |
| Type | Seamount chain |
| Age of rock | |
Geography
The Magellan Seamounts extend from 11.0°N 151.0°E to 18.0°N 157.0°E [1]
They include:
- Govorov Guyot[7]
- 18°00.25′N 151°13.50′E[7]
- 121 ± 2.8 to 98.5 ± 1.4 Ma[7]
- Ioah Seamount (also known as Ioah Guyot, Ioan Seamount or Fedorov Seamount)
- 14°06.00′N 156°08.40′E[8]
- 87 millon years old[8]
- Pako Guyot
- 15°42.83′N 155°11.96′E[9]
- 92 millon years old[9] but volcanics have been now dated in range 112 to 86 Ma and < 20 Ma in smaller volcanoes on the guyot.[10]
- Vlinder Guyot (also known as Alba Guyot)
- 16°57.61′N 154°16.63′E[11]
- 95 millon years old[11]
- Ita Mai Tai Guyot
- 12°51.00′N 156°46.20′E[12]
- 118 millon years old[12]
Geology
The volcanoes are part of a hotspot chain whose formation ages are in the range 121 to 86 million years ago.[10][7][8][13] However recently sampling has shown secondary volcanic activity at about 20 million years ago.[10] Pako Guyot, which is quite large, is to date the only ocean island basalt seamount where two quite distinct mantle plume components have been discovered in one seamount, being an extreme high μ = 238U/204Pb mantle (HIMU) and enriched mantle 1 (EM1) component. These are respectively suggestive of associations with the Arago hotspot and/or the Rarotonga hotspot and make a previously suggested association with the Samoa hotspot less likely.[5] Given their age the guyots have also had sedimentary deposits which have been characterised as reef and planktonic limestones.[14][15] They are of interest for their mineral potential, for example with cobalt containing ferromanganese nodule deposits.[6]
See also
References
- Marine Gazetteer:Magellan Seamounts
- Marine Gazetter:deleted entry record Magellan Rise
- Zakharov, Yu D.; Pletnev, S. P.; Mel’nikov, M. E.; Smyshlyaeva, O. P.; Khudik, V. D.; Evseev, G. A.; Punina, T. A.; Safronov, P. P.; Popov, A. M. (1 February 2007). "The first finds of cretaceous belemnites from the Magellan Rise, Pacific Ocean". Russian Journal of Pacific Geology. 1 (1): 30. doi:10.1134/S1819714007010058. ISSN 1819-7140. S2CID 129404630.
- Mel'nikov, M. E.; Pletnev, S. P.; Basov, I. A. (2006). "New Geological and Paleontological Data on Fedorov Guyot, Magellan Seamounts, Pacific". Tikhookean. Geol. (in Russian). 25 (1): 3–13.
- Wei, Xun; Zhang, Yan; Shi, Xue-Fa; Castillo, Paterno R; Xu, Yi-Gang; Yan, Quan-Shu; Liu, Ji-Hua (2022). "Co-Occurrence of HIMU and EM1 Components in a Single Magellan Seamount: Implications for the Formation of West Pacific Seamount Province". Journal of Petrology. 63 (4). doi:10.1093/petrology/egac022.
- "International Seabed Authority Minerals: Cobalt-rich Ferromanganese Crusts Contractors". Retrieved 5 March 2023.
- Peretyazhko, IS; Savina, EA (2022). "Cretaceous intraplate volcanism of Govorov Guyot and formation models of the Magellan seamounts Pacific Ocean". International Geology Review: 1–27.
- "Ioah Seamount". Seamount Catalog. Retrieved 5 Mar 2023.
- "Pako Guyot". Seamount Catalog. Retrieved 5 Mar 2023.
- Peretyazhko, I.S.; Savina, E.A.; Pulyaeva, I.A.; Yudin, D.S. (2023). "Intraplate Volcanism of the Alba Guyot: Geodynamic Formation Models of the Magellan Seamounts in the Pacific Ocean for 100 million years". Russian Geology Geophysics. 64 (1): 1–27. doi:10.2113/RGG20214422.
- "Vlinder Guyot". Seamount Catalog. Retrieved 5 Mar 2023.
- "Ita Mai Tai Guyot". Seamount Catalog. Retrieved 5 Mar 2023.
- Mel'nikov, M. E.; Pletnev, S. P.; Anokhin, V. M.; Sedysheva, T. E.; Ivanov, V. V. (November 2016). "Volcanic edifices on guyots of the Magellan Seamounts (Pacific Ocean)". Russian Journal of Pacific Geology. 10 (6): 435–442. doi:10.1134/s1819714016060038. ISSN 1819-7140. S2CID 132364693.
- Pletnev, S. P. (1 September 2019). "Main Types of Aptian–Cenomanian Sedimentary Rocks on Guyots of the Magellan Mountains, Pacific Ocean". Russian Journal of Pacific Geology. 13 (5): 436–445. doi:10.1134/S1819714019050087. ISSN 1819-7159. S2CID 203654288.
- Pletnev, S. P. (1 January 2021). "The Main Types of Paleogene Sedimentary Rocks and Conditions of their Formation on the Guyots of the Magellan Seamounts (Pacific Ocean)". Russian Journal of Pacific Geology. 15 (1): 72–83. doi:10.1134/S1819714021010061. ISSN 1819-7159. S2CID 232042072.