Upper mantle body
{{Short description|Geological region}}
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{{cite journal|last1=Andal|first1=Eric S.|last2=Arai|first2=Shoji|last3=Yumul|first3=Graciano P.|title=Complete mantle section of a slow-spreading ridge-derived ophiolite: An example from the Isabela ophiolite in the Philippines|journal=Island Arc|date=1 September 2005|volume=14|issue=3|pages=272–294|doi=10.1111/j.1440-1738.2005.00471.x|language=en|issn=1440-1738|hdl=2297/19546|s2cid=128460236 |url=https://kanazawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=11015|hdl-access=free}}
- upper mantle above subduction zones, so called suprasubduction ophiolites{{cite journal|last1=Shervais|first1=John W.|title=Birth, death, and resurrection: The life cycle of suprasubduction zone ophiolites|journal=Geochemistry, Geophysics, Geosystems|date=1 January 2001|volume=2|issue=1|pages=1010|doi=10.1029/2000GC000080|language=en|issn=1525-2027|bibcode=2001GGG.....2.1010S|doi-access=free}} (such as Troodos Ophiolite, Cyprus{{cite journal|last1=Miyashiro|first1=Akiho|title=The Troodos ophiolitic complex was probably formed in an island arc|journal=Earth and Planetary Science Letters|date=1 June 1973|volume=19|issue=2|pages=218–224|doi=10.1016/0012-821X(73)90118-0|bibcode=1973E&PSL..19..218M}})
- upper mantle exposed by thinning of continental crust by extension to continental crust removal{{cite journal|last1=Bernoulli|first1=Daniel|last2=Jenkyns|first2=Hugh C.|title=Ophiolites in ocean–continent transitions: From the Steinmann Trinity to sea-floor spreading|journal=Comptes Rendus Geoscience|date=1 May 2009|volume=341|issue=5|pages=363–381|doi=10.1016/j.crte.2008.09.009|bibcode=2009CRGeo.341..363B|url=https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.1016/j.crte.2008.09.009/ }} (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{{cite book|last1=Mohriak|first1=edited by W.U.|last2=Danforth|first2=A.|last3=Post|first3=P.J.|last4=Brown|first4=D.E.|last5=Tari|first5=G.C.|last6=Nemčok|first6=M.|last7=Sinha|first7=S.T.|title=Conjugate divergent margins|date=2013|publisher=Geological Society of London|location=London|isbn=978-1862393493}} in the Atlantic.
- upper mantle exposures on earth's surface on the ocean floor. Examples include Gakkel Ridge{{cite journal|last1=Michael|first1=P. J.|last2=Langmuir|first2=C. H.|last3=Dick|first3=H. J. B.|last4=Snow|first4=J. E.|last5=Goldstein|first5=S. L.|last6=Graham|first6=D. W.|last7=Lehnert|first7=K.|last8=Kurras|first8=G.|last9=Jokat|first9=W.|last10=Mühe|first10=R.|last11=Edmonds|first11=H. N.|title=Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean|journal=Nature|date=26 June 2003|volume=423|issue=6943|pages=956–961|doi=10.1038/nature01704|language=en|issn=0028-0836|pmid=12827193|bibcode=2003Natur.423..956M|s2cid=4312652}} and Lena Trough.{{cite journal|last1=Snow|first1=Jonathan E.|last2=Hellebrand|first2=Eric|last3=von der Handt|first3=Anette|last4=Nauret|first4=Francois|last5=Gao|first5=Yongjun|last6=Schenke|first6=Hans Werner|title=Oblique nonvolcanic seafloor spreading in Lena Trough, Arctic Ocean|journal=Geochemistry, Geophysics, Geosystems|date=1 October 2011|volume=12|issue=10|pages=Q10009|doi=10.1029/2011GC003768|language=en|issn=1525-2027|bibcode=2011GGG....1210009S|doi-access=free}}
- upper mantle exposures on earth's surface of disputed origin
- upper mantle exposure on earth's surface of not understood environment