A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes

Abstract The northern and northwestern margins of the Arabian Plate are a locus of a diffuse and long-lasting (early Miocene to Pleistocene) Na-alkali basaltic volcanism, sourced in the asthenosphere mantle. The upwelling asthenosphere at the Africa–Arabia margin produces very limited magma volumes...

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Autores principales:	Samuele Agostini, Paolo Di Giuseppe, Piero Manetti, Carlo Doglioni, Sandro Conticelli
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a82c6ae17d444402b8e00c1e9985c3eb
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spelling	oai:doaj.org-article:a82c6ae17d444402b8e00c1e9985c3eb2021-12-02T16:53:19ZA heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes10.1038/s41598-021-90275-72045-2322https://doaj.org/article/a82c6ae17d444402b8e00c1e9985c3eb2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90275-7https://doaj.org/toc/2045-2322Abstract The northern and northwestern margins of the Arabian Plate are a locus of a diffuse and long-lasting (early Miocene to Pleistocene) Na-alkali basaltic volcanism, sourced in the asthenosphere mantle. The upwelling asthenosphere at the Africa–Arabia margin produces very limited magma volumes in the axial zone. Therefore, portions of hot, fertile mantle continue their eastward migration and are stored at shallower depths under the 100-km thick Arabian lithosphere, which is much thinner than the African one (≈175 km): this causes the occurrence and 20-Ma persistence of magma supply under the study area. Erupted basalts sampled a continuous variation of the mantle source, with a striking correlation among temperature, pressure and isotopic composition shifting between two end members: a 100 km-deep, more depleted source, and a 60 km-deep, more enriched one. In particular, we observed an unusual variation in boron isotopes, which in the oceanic domain does not vary between more depleted and more enriched mantle sources. This study shows that, at least in the considered region, subcontinental mantle is more heterogeneous than the suboceanic one, and able to record for very long times recycling of shallow material.Samuele AgostiniPaolo Di GiuseppePiero ManettiCarlo DoglioniSandro ConticelliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samuele Agostini Paolo Di Giuseppe Piero Manetti Carlo Doglioni Sandro Conticelli A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
description	Abstract The northern and northwestern margins of the Arabian Plate are a locus of a diffuse and long-lasting (early Miocene to Pleistocene) Na-alkali basaltic volcanism, sourced in the asthenosphere mantle. The upwelling asthenosphere at the Africa–Arabia margin produces very limited magma volumes in the axial zone. Therefore, portions of hot, fertile mantle continue their eastward migration and are stored at shallower depths under the 100-km thick Arabian lithosphere, which is much thinner than the African one (≈175 km): this causes the occurrence and 20-Ma persistence of magma supply under the study area. Erupted basalts sampled a continuous variation of the mantle source, with a striking correlation among temperature, pressure and isotopic composition shifting between two end members: a 100 km-deep, more depleted source, and a 60 km-deep, more enriched one. In particular, we observed an unusual variation in boron isotopes, which in the oceanic domain does not vary between more depleted and more enriched mantle sources. This study shows that, at least in the considered region, subcontinental mantle is more heterogeneous than the suboceanic one, and able to record for very long times recycling of shallow material.
format	article
author	Samuele Agostini Paolo Di Giuseppe Piero Manetti Carlo Doglioni Sandro Conticelli
author_facet	Samuele Agostini Paolo Di Giuseppe Piero Manetti Carlo Doglioni Sandro Conticelli
author_sort	Samuele Agostini
title	A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
title_short	A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
title_full	A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
title_fullStr	A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
title_full_unstemmed	A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
title_sort	heterogeneous subcontinental mantle under the african–arabian plate boundary revealed by boron and radiogenic isotopes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a82c6ae17d444402b8e00c1e9985c3eb
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A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes

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