Magellan Rise (ocean plateau)

07°04.1′N 176°49.5′W / 7.0683°N 176.8250°W / 7.0683; -176.8250[1]Magellan Rise is an oceanic plateau in the Pacific Ocean,[1] which covers a surface area of 500,000 square kilometres (190,000 sq mi).[2] There is another geological structure with the same name west from the Marshall Islands.[3]

The Magellan Rise has been called a large igneous province[a] by Coffin and Endholm 2001[5] and was emplaced 145 million[4] or 135-128 million years ago, possibly as a consequence of intense volcanism at a former triple junction.[6] Alternatively, the Rise was formed by a mantle plume[7] linked to the deep "JASON superplume",[8] or from the interaction of a spreading ridge with a plume.[9] Candidate mantle plumes are the Easter hotspot[10] and the Foundation hotspot.[11]

The volume of rocks in the Magellan Rise is very uncertain, but may be in the range of 1,800,000 cubic kilometres (430,000 cu mi)[2] to 19,740,000 cubic kilometres (4,740,000 cu mi).[12] It apparently developed first on the Phoenix Plate before being transferred onto the Pacific Plate 125 million years ago.[13] The Magellan Rise has never risen to shallow depths, at least since the Cretaceous, and it is covered by sediments of Tithonian/Berriasian to Quaternary age.[1] The sediments include chalk, chert, limestone[14] (including fossil belemnites,[15] molluscs and polychaetes[16]), phosphorites[17] and volcanic ash from the Ontong Java Plateau, which were emplaced during the Selli Event.[18]

Notes

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  1. ^ Other such provinces in the Pacific Ocean are the Hess Rise, Manihiki Plateau, Mid-Pacific Mountains, Ontong Java Plateau and Shatsky Rise.[4]

References

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  1. ^ a b c Schlanger, Seymour O.; Douglas, Robert G.; Lancelot, Yves; Moore, Jr., T.C.; Roth, Peter H. (2007). "Fossil Preservation and Diagenesis of Pelagic Carbonates from the Magellan Rise, Central North Pacific Ocean". Initial Reports of the Deep Sea Drilling Project, 17. Initial Reports of the Deep Sea Drilling Project. Vol. 17. doi:10.2973/dsdp.proc.17.113.1973.
  2. ^ a b Utsunomiya, Atsushi; Suzuki, Norihito; Ota, Tsutomu (August 2008). "Preserved paleo-oceanic plateaus in accretionary complexes: Implications for the contributions of the Pacific superplume to global environmental change". Gondwana Research. 14 (1–2): 121. Bibcode:2008GondR..14..115U. doi:10.1016/j.gr.2007.11.003. ISSN 1342-937X.
  3. ^ 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.
  4. ^ a b Ernst, Buchan & Campbell 2005, p. 274.
  5. ^ Ernst, Buchan & Campbell 2005, p. 272.
  6. ^ Tamaki, Kensaku; Joshima, Masato; Larson, Roger L. (1979). "Remanent Early Cretaceous spreading center in the Central Pacific Basin". Journal of Geophysical Research. 84 (B9): 4509. Bibcode:1979JGR....84.4501T. doi:10.1029/JB084iB09p04501.
  7. ^ Larson & Olson 1991, p. 446.
  8. ^ Torsvik, Trond H.; Steinberger, Bernhard; Shephard, Grace E.; Doubrovine, Pavel V.; Gaina, Carmen; Domeier, Mathew; Conrad, Clinton P.; Sager, William W. (July 2019). "Pacific‐Panthalassic Reconstructions: Overview, Errata and the Way Forward". Geochemistry, Geophysics, Geosystems. 20 (7): 3679. Bibcode:2019GGG....20.3659T. doi:10.1029/2019GC008402. hdl:10852/73922.
  9. ^ Ramos, Juan Pablo; Mann, Paul; Carvajal‐Arenas, Luis Carlos (February 2025). "Crustal Structure and Tectonic Origin of Late Cretaceous Oceanic Crust and Adjacent Caribbean Large Igneous Province in the Colombian Basin". Geochemistry, Geophysics, Geosystems. 26 (2): 22. doi:10.1029/2024GC011602.
  10. ^ Barbara H. Keating (1987). Seamounts, islands, and atolls. Washington, D.C.: American Geophysical Union. p. 217. ISBN 9781118664209.
  11. ^ Clouard, Valérie; Bonneville, Alain (1 August 2001). "How many Pacific hotspots are fed by deep-mantle plumes?". Geology. 29 (8): 697–698. Bibcode:2001Geo....29..695C. doi:10.1130/0091-7613(2001)029<0695:HMPHAF>2.0.CO;2. ISSN 0091-7613.
  12. ^ Larson & Olson 1991, p. 439.
  13. ^ Larson, Roger L. (1976). "Late Jurassic and Early Cretaceous evolution of the Western Central Pacific Ocean". Journal of Geomagnetism and Geoelectricity. 28 (3): 234. Bibcode:1976JGG....28..219L. doi:10.5636/jgg.28.219. ISSN 0022-1392.
  14. ^ Zakharov, David O.; Marin‐Carbonne, Johanna; Pack, Andreas; Di Rocco, Tommaso; Robyr, Martin; Vennemann, Torsten (March 2023). "In‐Situ and Triple Oxygen Isotope Characterization of Seafloor Drilled Cherts: Marine Diagenesis and Its Bearing on Seawater Reconstructions". Geochemistry, Geophysics, Geosystems. 24 (3). doi:10.1029/2022GC010741. ISSN 1525-2027.
  15. ^ Keutgen, Norbert; Remin, Zbyszek (2024). "Belemnites of the family Belemnitellidae Pavlow, 1914 from the Late Cretaceous Maastrichtian stage in the Northern Hemisphere". Netherlands Journal of Geosciences. 103: 5. doi:10.1017/njg.2024.15.
  16. ^ Lourido, Antía; Parra, Santiago; Serrano, Alberto (24 February 2025). "Bathyal infaunal communities from a deep seamount (Galicia Bank, northeast Atlantic)". Scientia Marina. 88 (3): 9. doi:10.3989/scimar.05514.088.
  17. ^ Sattarova, V.V.; Volokhin, Yu.G.; Kirichenko, I.S.; Zarubina, N.V. (April 2025). "New geochemical and mineralogical data of Ogasawara phosphorites (northwestern Pacific)". Regional Studies in Marine Science. 83: 10. doi:10.1016/j.rsma.2025.104101.
  18. ^ Matsumoto, Hironao; Shirai, Kotaro; Ishikawa, Akira; Ohkouchi, Naohiko; Ogawa, Nanako O.; Tejada, Maria Luisa G.; Ando, Atsushi; Kuroda, Junichiro; Suzuki, Katsuhiko (28 February 2025). "Multidisciplinary evidence for synchroneity between Ontong Java Nui volcanism and early Aptian oceanic anoxic event 1a". Science Advances. 11 (9): 4. doi:10.1126/sciadv.adt0204.

Sources

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