Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation

Abstract Rare oceanic diamonds are believed to have a mantle transition zone origin like super-deep continental diamonds. However, oceanic diamonds have a homogeneous and organic-like light carbon isotope signature (δ13C − 28 to − 20‰) instead of the extremely variable organic to lithospheric mantle...

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Autores principales:	Luc S. Doucet, Zheng-Xiang Li, Hamed Gamal El Dien
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0a7ae8b37555475286a9bf7024e23645
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spelling	oai:doaj.org-article:0a7ae8b37555475286a9bf7024e236452021-12-02T15:10:54ZOceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation10.1038/s41598-021-96286-82045-2322https://doaj.org/article/0a7ae8b37555475286a9bf7024e236452021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96286-8https://doaj.org/toc/2045-2322Abstract Rare oceanic diamonds are believed to have a mantle transition zone origin like super-deep continental diamonds. However, oceanic diamonds have a homogeneous and organic-like light carbon isotope signature (δ13C − 28 to − 20‰) instead of the extremely variable organic to lithospheric mantle signature of super-deep continental diamonds (δ13C − 25‰ to + 3.5‰). Here, we show that with rare exceptions, oceanic diamonds and the isotopically lighter cores of super-deep continental diamonds share a common organic δ13C composition reflecting carbon brought down to the transition zone by subduction, whereas the rims of such super-deep continental diamonds have the same δ13C as peridotitic diamonds from the lithospheric mantle. Like lithospheric continental diamonds, almost all the known occurrences of oceanic diamonds are linked to plume-induced large igneous provinces or ocean islands, suggesting a common connection to mantle plumes. We argue that mantle plumes bring the transition zone diamonds to shallower levels, where only those emplaced at the base of the continental lithosphere might grow rims with lithospheric mantle carbon isotope signatures.Luc S. DoucetZheng-Xiang LiHamed Gamal El DienNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Luc S. Doucet Zheng-Xiang Li Hamed Gamal El Dien Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
description	Abstract Rare oceanic diamonds are believed to have a mantle transition zone origin like super-deep continental diamonds. However, oceanic diamonds have a homogeneous and organic-like light carbon isotope signature (δ13C − 28 to − 20‰) instead of the extremely variable organic to lithospheric mantle signature of super-deep continental diamonds (δ13C − 25‰ to + 3.5‰). Here, we show that with rare exceptions, oceanic diamonds and the isotopically lighter cores of super-deep continental diamonds share a common organic δ13C composition reflecting carbon brought down to the transition zone by subduction, whereas the rims of such super-deep continental diamonds have the same δ13C as peridotitic diamonds from the lithospheric mantle. Like lithospheric continental diamonds, almost all the known occurrences of oceanic diamonds are linked to plume-induced large igneous provinces or ocean islands, suggesting a common connection to mantle plumes. We argue that mantle plumes bring the transition zone diamonds to shallower levels, where only those emplaced at the base of the continental lithosphere might grow rims with lithospheric mantle carbon isotope signatures.
format	article
author	Luc S. Doucet Zheng-Xiang Li Hamed Gamal El Dien
author_facet	Luc S. Doucet Zheng-Xiang Li Hamed Gamal El Dien
author_sort	Luc S. Doucet
title	Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
title_short	Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
title_full	Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
title_fullStr	Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
title_full_unstemmed	Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
title_sort	oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0a7ae8b37555475286a9bf7024e23645
work_keys_str_mv	AT lucsdoucet oceanicandsuperdeepcontinentaldiamondsshareatransitionzoneoriginandmantleplumetransportation AT zhengxiangli oceanicandsuperdeepcontinentaldiamondsshareatransitionzoneoriginandmantleplumetransportation AT hamedgamaleldien oceanicandsuperdeepcontinentaldiamondsshareatransitionzoneoriginandmantleplumetransportation
_version_	1718387612339666944

Oceanic and super-deep continental diamonds share a transition zone origin and mantle plume transportation

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