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- W14987150 abstract "The presence of an active iron cycle in modern intertidal sediment from Willapa Bay is confirmed using X-ray radiography and X-ray diffraction (XRD) analyses. The data show that Fe minerals are present in two different redox states. The first is maghemite (Fe2O3), which formed on the linings of irrigated burrows. The second is pyrite (FeS2), which formed as haloes around abandoned or filled burrows. Some pyrite halos coalesced to form nodules of pyrite around the burrow fabric. The mineral paragenesis occurred as follows: (a) detrital ferrous-rich sediment (e.g., pyroxene or organometallic complexes) is buried and progressively dissolved to Fe2 + ; (b) the Fe2 + either reacts with pore-water sulfide (formed via bacterial sulfate reduction) to form pyrite in the matrix or it diffuses to the burrow margins where it is oxidized to form maghemite; (c) when the burrows become abandoned and isolated from the overlying oxic seawater, the ferric iron is biologically reduced to Fe2 + (via bacterial iron reduction) where it repeats Step 2. The pyrite remains stable unless exposed again to oxidizing conditions, such as later bioturbation. The inchoate nodules appear to form in less than a decade. Interestingly, the mineral distributions observed here are reminiscent of nodules observed in several other marginal marine settings, particularly those that have an oxidized-Fe-mineral core and a pyrite rind. Although those nodules are normally taken to infer evolving pore-water compositions, perhaps they are more simply explained by the processes reported above." @default.
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- W14987150 date "2014-01-01" @default.
- W14987150 modified "2023-10-18" @default.
- W14987150 title "Using X-ray Radiography to Observe Fe Distributions in Bioturbated Sediment" @default.
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- W14987150 doi "https://doi.org/10.1007/978-94-017-8721-5_9" @default.
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