Heavy boron isotopes in intraplate basalts reveal recycled carbonate in the mantle.

ABSTRACT: Recycling of surficial volatiles such as carbon into the mantle plays a fundamental role in modulating Earth's habitability. However, slab devolatilization during subduction could prevent carbon from entering the deep mantle. Boron isotopes are excellent tracers of recycled volatiles, but correlations between boron isotopes and mantle heterogeneity indicators are rarely observed, thereby casting doubt that substantial amounts of volatiles and boron can be recycled into the deep mantle. Here, we show that boron isotopes in two different types of primitive continental intraplate basalts correlate well with mantle heterogeneity indicators, indicating contributions of various subducted crustal components. A common high-δ¹¹B component shared by both types of basalts is best explained

SUBMITTER: Xu R 

PROVIDER: S-EPMC12017311 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature