Subduction is the main process that recycles surface material into the mantle. Fluids and melts derived by de-hydration and partial melting reactions of subducted continental crust, a major reservoir of volatiles (i.e., H2O and CO2) and incompatible elements, can substantially metasomatize and refertilize the mantle. Here, we inves-tigate glassy inclusions of silicate melt of continental origin found in Variscan ultrahigh-pressure eclogites to assess the continental crust contribution to mantle metasomatism and the journey of volatiles, carbon in par-ticular, to the deep roots of mountain belts. We argue that the melt preserved in these inclusions is the agent responsible for mantle metasomatism and subsequent ultrapotassic magmatism in the Variscides. We propose that continental subduction can redistribute a substantial volume of carbon in the continental lithosphere, which is subsequently transferred to the continental crust during postcollisional magmatism and stored for a time length longer than that of the modern carbon cycle.

The role of continental subduction in mantle metasomatism and carbon recycling revealed by melt inclusions in UHP eclogites / A. Borghini, G. Nicoli, S. Ferrero, P.J. O'Brien, O. Laurent, L. Remusat, G. Borghini, S. Milani. - In: SCIENCE ADVANCES. - ISSN 2375-2548. - 9:6(2023 Feb 10), pp. eabp9482.1-eabp9482.11. [10.1126/sciadv.abp9482]

The role of continental subduction in mantle metasomatism and carbon recycling revealed by melt inclusions in UHP eclogites

G. Borghini
Penultimo
;
S. Milani
Ultimo
2023

Abstract

Subduction is the main process that recycles surface material into the mantle. Fluids and melts derived by de-hydration and partial melting reactions of subducted continental crust, a major reservoir of volatiles (i.e., H2O and CO2) and incompatible elements, can substantially metasomatize and refertilize the mantle. Here, we inves-tigate glassy inclusions of silicate melt of continental origin found in Variscan ultrahigh-pressure eclogites to assess the continental crust contribution to mantle metasomatism and the journey of volatiles, carbon in par-ticular, to the deep roots of mountain belts. We argue that the melt preserved in these inclusions is the agent responsible for mantle metasomatism and subsequent ultrapotassic magmatism in the Variscides. We propose that continental subduction can redistribute a substantial volume of carbon in the continental lithosphere, which is subsequently transferred to the continental crust during postcollisional magmatism and stored for a time length longer than that of the modern carbon cycle.
Settore GEO/07 - Petrologia e Petrografia
10-feb-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/999332
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