Collected Item: “Recycled Carbonate‐Bearing Silicate Sediments in the Sources of Circum‐Mediterranean K‐Rich Lavas: Evidence From Mg‐Zn Isotopic Decoupling”
Врста публикације
Рад у часопису
Верзија рада
објављена верзија
Језик рада
енглески
Аутор/и (Милан Марковић, Никола Николић)
Zi‐Tan Shu, Sheng‐Ao Liu, Dejan Prelević, Yu Wang, Stephen F Foley, Vladica Cvetković, Shuguang Li
Наслов рада (Наслов - поднаслов)
Recycled Carbonate‐Bearing Silicate Sediments in the Sources of Circum‐Mediterranean K‐Rich Lavas: Evidence From Mg‐Zn Isotopic Decoupling
Наслов часописа
Journal of Geophysical Research: Solid Earth
Издавач (Београд : Просвета)
American Geophysical Union
Година издавања
2023
Сажетак на енглеском језику
The high flux of subaerial volcanic CO2 emissions around the circum-Mediterranean region requires the involvement of an unusually carbon-rich reservoir, but the origin of which is still unclear. Here, we aim to resolve this problem by analyzing Mg and Zn isotopes for the widely distributed mafic potassic to ultrapotassic lavas in this region. These K-rich lavas have lower δ 26Mg but similar δ 66Zn compared to mid-ocean ridge basalts (MORB). No known magmatic processes can explain the isotopic data, which must therefore be characteristics of the mantle sources. Recycled carbonate sediments are capable of explaining the low δ 26Mg, but they typically also have high δ 66Zn. Thus, the low δ 26Mg but unfractionated δ 66Zn of these K-rich lavas define “Mg-Zn isotopic decoupling” which has not yet been observed for other types of mantle-derived lavas. The carbonate-bearing silicate sediments analyzed here possess low δ 26Mg and MORB like δ 66Zn, which can account for the Mg-Zn isotopic decoupling. Therefore, the nature of recycled materials (carbonates vs. carbonate-bearing silicate sediments) in the mantle can be distinguished by the coupling or decoupling of Mg and Zn isotopes of mantle-derived magmas. The input flux of carbon from the sediments to the lithospheric mantle is estimated to be ∼8.1 Mt/yr, and ∼22.4 Mt/yr of CO2 emissions are predicted, which fit well with the observed output flux of 20.1 ± 13.4 Mt/yr. Our results demonstrate that recycled crustal carbon stored in the lithospheric mantle is an important source for the extensive subaerial volcanic CO2 emissions in the circum-Mediterranean region.
Број часописа
10.1029/2022JB025135
DOI број
10.1029/2022JB025135
ISSN број часописа
2169-9356
Кључне речи на српском (одвојене знаком ", ")
Mg i Zn izotopski sistemi i njihovo razdvajanje, Circum-Mediteranske K-bogate lave, Carbonatitski metasomatizam omotača, recikliranje sedimenata
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М21
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RECON TETHYS - 7744807
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