A heterogeneous subcontinental mantle under the African–Arabian Plate boundary revealed by boron and radiogenic isotopes
| Autor: | Agostini S.[1], Di Giuseppe P.[1], Manetti P.[2], Doglioni C.[3, Conticelli S.[2 |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Solid Earth sciences
010504 meteorology & atmospheric sciences Science Geochemistry Volcanism 010502 geochemistry & geophysics Geodynamics 01 natural sciences Mantle (geology) Article Lithosphere Asthenosphere geodynamics petrology geochemistry westward drift of the lithosphere 0105 earth and related environmental sciences Petrology Basalt Multidisciplinary Plate tectonics Medicine Upwelling boron Geology |
| Zdroj: | Scientific Reports Scientific reports (Nature Publishing Group) 11 (2021): 1–13. doi:10.1038/s41598-021-90275-7 info:cnr-pdr/source/autori:Agostini S.[1], Di Giuseppe P.[1], Manetti P.[2], Doglioni C.[3,4], Conticelli S.[2,5]/titolo:A heterogeneous subcontinental mantle under the African-Arabian Plate boundary revealed by boron and radiogenic isotopes/doi:10.1038%2Fs41598-021-90275-7/rivista:Scientific reports (Nature Publishing Group)/anno:2021/pagina_da:1/pagina_a:13/intervallo_pagine:1–13/volume:11 Scientific Reports, Vol 11, Iss 1, Pp 1-13 (2021) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-021-90275-7 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink