Earth Sciences

Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle

R. Yin, D. Chen, et al.

This groundbreaking study by Runsheng Yin and colleagues explores the intricate deep geological cycling of mercury (Hg), revealing distinct isotopic signatures in different basalt types that hint at a larger story of Hg recycling within the Earth's mantle. Tune in to discover how oceanic and continental basalts play a role in this dynamic process!

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Abstract

This study investigates the deep geological cycling of mercury (Hg) by analyzing Hg isotopic compositions in various basalt types. Distinct mass-independent Hg isotope fractionation (Δ199Hg) is observed in island arc basalts (IABs) and mid-ocean ridge basalts (MORBs), indicating the recycling of marine Hg into the asthenospheric mantle. Ocean island basalts (OIBs) and continental flood basalts (CFBs) show no such crustal Hg isotope signature, suggesting that Hg recycling affects both upper and lower mantle. The study reveals large-scale translithospheric Hg recycling via plate tectonics.

Publisher

Nature Communications

Published On

Feb 17, 2022

Authors

Runsheng Yin, Di Chen, Xin Pan, Changzhou Deng, Liemeng Chen, Xieyan Song, Songyue Yu, Chuanwei Zhu, Xun Wei, Yue Xu, Xinbin Feng, Joel D. Blum, Bernd Lehmann

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