Upper mantle body

An upper mantle body is a geological region where upper mantle rocks (peridotite) outcrop on the surface of the Earth (including the ocean floor).

Upper mantle outcrops include:

• upper mantle made at constructive plate boundaries, but preserved in ophiolites, for example Isabela ophiolite in the Philippines ^[1]
• upper mantle above subduction zones, so called suprasubduction ophiolites ^[2] (such as Troodos Ophiolite, Cyprus ^[3] )
• upper mantle exposed by thinning of continental crust by extension to continental crust removal ^[4] (Ligurian "Ophiolites" and conjugate margin of Iberia and Newfoundland)
• upper mantle exposures on earth's surface above sea-water level in Oceans (whose ocean floor is covered with oceanic crust). Examples are Macquarie Island in the Pacific and the St. Peter and St. Paul Islands ^[5] in the Atlantic.
• upper mantle exposures on earth's surface on the ocean floor. Examples include Gakkel Ridge ^[6] and Lena Trough. ^[7]
• upper mantle exposures on earth's surface of disputed origin
• upper mantle exposure on earth's surface of not understood environment

References

1. Andal, Eric S.; Arai, Shoji; Yumul, Graciano P. (1 September 2005). "Complete mantle section of a slow-spreading ridge-derived ophiolite: An example from the Isabela ophiolite in the Philippines". Island Arc. 14 (3): 272–294. doi:10.1111/j.1440-1738.2005.00471.x. hdl: 2297/19546 . ISSN   1440-1738. S2CID   128460236.
2. Shervais, John W. (1 January 2001). "Birth, death, and resurrection: The life cycle of suprasubduction zone ophiolites". Geochemistry, Geophysics, Geosystems. 2 (1): 1010. Bibcode:2001GGG.....2.1010S. doi: 10.1029/2000GC000080 . ISSN   1525-2027.
3. Miyashiro, Akiho (1 June 1973). "The Troodos ophiolitic complex was probably formed in an island arc". Earth and Planetary Science Letters. 19 (2): 218–224. Bibcode:1973E&PSL..19..218M. doi:10.1016/0012-821X(73)90118-0.
4. Bernoulli, Daniel; Jenkyns, Hugh C. (1 May 2009). "Ophiolites in ocean–continent transitions: From the Steinmann Trinity to sea-floor spreading" . Comptes Rendus Geoscience. 341 (5): 363–381. Bibcode:2009CRGeo.341..363B. doi:10.1016/j.crte.2008.09.009.
5. Mohriak, edited by W.U.; Danforth, A.; Post, P.J.; Brown, D.E.; Tari, G.C.; Nemčok, M.; Sinha, S.T. (2013). Conjugate divergent margins. London: Geological Society of London. ISBN   978-1862393493.{{cite book}}: |first1= has generic name (help)
6. Michael, P. J.; Langmuir, C. H.; Dick, H. J. B.; Snow, J. E.; Goldstein, S. L.; Graham, D. W.; Lehnert, K.; Kurras, G.; Jokat, W.; Mühe, R.; Edmonds, H. N. (26 June 2003). "Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean". Nature. 423 (6943): 956–961. Bibcode:2003Natur.423..956M. doi:10.1038/nature01704. ISSN   0028-0836. PMID   12827193. S2CID   4312652.
7. Snow, Jonathan E.; Hellebrand, Eric; von der Handt, Anette; Nauret, Francois; Gao, Yongjun; Schenke, Hans Werner (1 October 2011). "Oblique nonvolcanic seafloor spreading in Lena Trough, Arctic Ocean". Geochemistry, Geophysics, Geosystems. 12 (10): Q10009. Bibcode:2011GGG....1210009S. doi: 10.1029/2011GC003768 . ISSN   1525-2027.