Upper mantle body explained

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

Notes and References

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