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Stable isotope evidence for light Zn burial in an oxic coastal bay: Implications for the modern marine Zn budget
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DOI：10.1016/j.gca.2026.07.036.png)
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Abstract
En 中文
Understanding zinc (Zn) cycling in coastal environments is crucial for constraining the global marine Zn budget and evaluating its impact on marine ecosystems. Here, we present the first detailed study of Zn isotope systematics across multiple environmental compartments (including surface sediments, sediment cores, riverine sediments, and aerosols) in the Bohai Bay (BHB), a shallow, semi-enclosed, oxic coastal system in northern China. Our results show that sedimentary Zn is derived from two dominant fluvial sources: Yellow River-derived detrital input representing natural lithogenic material and Haihe River particulates carrying an urban anthropogenic signature. By contrast, coastal industrial activities, atmospheric deposition, mariculture, and antifouling paints make only limited direct contributions to sedimentary Zn in BHB. Instead, up to ∼ 60% of sedimentary Zn is authigenic and exhibits an isotopically light signature (δ66Zn value varying from –0.87 to + 0.26‰). Multiple lines of evidences, including covariations in Fe and Zn enrichment factors, microscale mineralogical data, and contrasting Fe vs. Al distribution, indicate that seawater Zn burial is likely dominated by scavenging to reactive Fe-Mn (oxyhydr)oxides under oxic conditions. This interpretation is further supported by offshore core BHB16, which records the highest authigenic Zn fraction and yields the δ66Zn values (δ66Znauth = 0.07 ± 0.28‰, 2SD, n = 37) overlapping those of deep-sea dispersed Fe-Mn (oxyhydr)oxides reported previously (δ66Zn = –0.02‰ to + 0.34‰). Overall, our findings reveal a significant but previously under-constrained sink for isotopically light Zn in the modern marine Zn cycle.
Keywords:
Zn isotopes
Oxic coastal sediments
Fe-Mn (oxyhydr)oxides
Bohai Bay
Anthropogenic Zn
Oceanic mass balance
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