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• W1747999311 abstract "Actinium-227 (t 1/2 = 21.77 y) is produced by decay of protactinium-231 (t 1/2 = 32,760 y). Abyssal sediments are enriched in 231 Pa and thus provide a source of the more soluble 227 Ac to the deep-sea, where it can be used as a tracer of deep ocean diapycnal mixing. In this study, we examine the distribution of dissolved and particulate 227 Ac within a neutrally buoyant hydrothermal plume overlying the TAG vent field (26.14°N, 44.83°W, Mid-Atlantic Ridge) collected during the U.S. GEOTRACES North Atlantic Transect (2011). Elevated activities of both particulate and dissolved 227 Ac within the plume indicate that hydrothermal vents may be a previously unrecognized source of this isotope to the marine environment. We contend that vent fluids are the main source of the 227 Ac enrichment. Based on the activities of dissolved and particulate 227 Ac within the plume, a 3 He dilution model was used to derive a hydrothermal 227 Ac end-member activity of 1.5 × 10 4 –2.5 × 10 4 dpm m − 3 . Assuming that TAG is characteristic of all vents along the Mid-Atlantic Ridge, the hydrothermal source of 227 Ac to the deep Atlantic is estimated to be 1.9–5.8% of the flux from Atlantic sediments. Although this hydrothermal flux may not have a large impact on the total oceanic inventory of 227 Ac, it must be considered when using this isotope as a tracer of deep ocean mixing in areas where hydrothermal activity is present. • The TAG hydrothermal plume is enriched in dissolved and particulate 227 Ac. • Vent fluids are the most likely source of 227 Ac enrichment. • Estimated hydrothermal 227 Ac end-member activity is 1.5 × 10 4 –2.5 × 10 4 dpm m − 3 . • Atlantic hydrothermal flux of 227 Ac is approximately 1.9–5.8% of the sediment flux." @default.
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• W1747999311 date "2015-12-01" @default.
• W1747999311 modified "2023-10-17" @default.
• W1747999311 title "Hydrothermal vents: A previously unrecognized source of actinium-227 to the deep ocean" @default.
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• W1747999311 doi "https://doi.org/10.1016/j.marchem.2015.09.002" @default.
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