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](Example 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 Pacific and St. Peter and Paul island[5] in Atlantic.
- upper mantle exposures on earth's surface on the ocean floor. Examples is 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
- ↑ Andal, Eric S.; Arai, Shoji; Yumul, Graciano P. (1 September 2005). [10.1111/j.1440-1738.2005.00471.x "Complete mantle section of a slow-spreading ridge-derived ophiolite: An example from the Isabela ophiolite in the Philippines"] Check
|url=value (help). Island Arc. 14 (3): 272–294. doi:10.1111/j.1440-1738.2005.00471.x. ISSN 1440-1738. - ↑ Shervais, John W. (1 January 2001). "Birth, death, and resurrection: The life cycle of suprasubduction zone ophiolites". Geochemistry, Geophysics, Geosystems. 2 (1): 1010. doi:10.1029/2000GC000080. ISSN 1525-2027.
- ↑ 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. doi:10.1016/0012-821X(73)90118-0.
- ↑ 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. doi:10.1016/j.crte.2008.09.009.
- ↑ 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 1862393494.
- ↑ 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. doi:10.1038/nature01704. ISSN 0028-0836.
- ↑ 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. doi:10.1029/2011GC003768. ISSN 1525-2027.
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