Magellan Rise (ocean plateau)

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 "Magellan Rise" west from the Marshall Islands as well.[3]

The Magellan Rise has been called a large igneous province[lower-alpha 1] 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] Candidate mantle plumes are the Easter hotspot[8] and the Foundation hotspot.[9]

The volume of rocks in the Magellan Rise is about 1,800,000 cubic kilometres (430,000 cu mi)[2]-19,740,000 cubic kilometres (4,740,000 cu mi).[10] It apparently developed first on the Phoenix Plate before being transferred onto the Pacific Plate 125 million years ago.[11] The Magellan Rise never rose to shallow depths at least since the Cretaceous, and the Rise is covered by sediments of Tithonian/Berriasian to Quaternary age.[1]

Notes
  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
  1. 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. 17. doi:10.2973/dsdp.proc.17.113.1973.
  2. 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. 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.
  4. 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. doi:10.1029/JB084iB09p04501.
  7. Larson & Olson 1991, p. 446.
  8. Barbara H. Keating (1987). Seamounts, islands, and atolls. Washington, D.C.: American Geophysical Union. p. 217. ISBN 9781118664209.
  9. Clouard, Valérie; Bonneville, Alain (1 August 2001). "How many Pacific hotspots are fed by deep-mantle plumes?". Geology. 29 (8): 697–698. doi:10.1130/0091-7613(2001)029<0695:HMPHAF>2.0.CO;2. ISSN 0091-7613.
  10. Larson & Olson 1991, p. 439.
  11. Larson, Roger L. (1976). "Late Jurassic and Early Cretaceous evolution of the Western Central Pacific Ocean". Journal of Geomagnetism and Geoelectricity. 28 (3): 234. doi:10.5636/jgg.28.219. ISSN 0022-1392.

Sources
  • Ernst, Richard E.; Buchan, Kenneth L.; Campbell, Ian H. (February 2005). "Frontiers in large igneous province research". Lithos. 79 (3–4): 271–297. doi:10.1016/j.lithos.2004.09.004. ISSN 0024-4937.CS1 maint: ref=harv (link)
  • Larson, Roger L.; Olson, Peter (December 1991). "Mantle plumes control magnetic reversal frequency". Earth and Planetary Science Letters. 107 (3–4): 437–447. doi:10.1016/0012-821X(91)90091-U. ISSN 0012-821X.CS1 maint: ref=harv (link)
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