Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Zhu, Mao‐Xu; Huang, Xiang-Li; Yang, Gui‐Peng; Chen, Liang-Jin

doi:10.1016/j.ecss.2015.08.018

Cited by 13 publications

(4 citation statements)

References 68 publications

(110 reference statements)

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“…Previous studies have shown that TOC is often positively correlated with Fe HR in surface sediments from riverine particulates, glaciers and marginal seas (Poulton and Raiswell, 2005;Zhu et al, 2012;Roy et al, 2013;Zhu et al, 2015). However, there is no significant (p > 0.05) correlation between the TOC and Fe HR , Fe carb , Fe ox1 or Fe ox2 content in the sediments of our study area (Figures S2C-F), possibly due to the complex sedimentary environment.…”

Section: Relationship Between Fe Hr and Toccontrasting

confidence: 54%

“…This situation is similar to those in rivers of middle and low latitudes, which can continuously transport Fecontaining particulates with high Fe HR /Fe T ratio. Besides, the Fe HR / Fe T ratios are significantly (p < 0.05) higher off King George Island (Figure 4), probably due to the semi-enclosed bay topography, which is conducive to Fe HR enrichment, similar to the Jiaozhou Bay and Bohai Sea (Zhu et al, 2015;Wang et al, 2019).…”

Section: Total Fe and Fe Speciationmentioning

confidence: 97%

“…This finding is consistent with the global riverine and glacial particulates, implying that Fe HR are closely associated with Fe-bearing aluminosilicate minerals (Poulton and Raiswell, 2002;Poulton and Raiswell, 2005). The Fe HR /Fe T ratios in the research region (0.13 ± 0.06) are similar to those in Antarctic Comparison of Fe HR /Fe T and Fe T in "Coarse", "Medium", "Fine" and "Ultra-fine" categories of sediments from Prydz Bay and the adjacent Southern Ocean with global riverine particulates and modern marine sediments, Antarctic glaciers (Raiswell and Canfield, 1998;Poulton and Raiswell, 2002), off the western Antarctic Peninsula (Burdige and Christensen, 2022), off King George Island (Henkel et al, 2018), South Yellow Sea (Ma et al, 2018), East China Sea (Zhu et al, 2012), Barents Sea (Faust et al, 2021), Umpqua (Roy et al, 2013) and the Jiaozhou Bay (Zhu et al, 2015). Data are averages of surface sediments (0 -2 cm) by recalculation of Henkel et al (2018) and Burdige and Christensen (2022).…”

Section: Total Fe and Fe Speciationmentioning

confidence: 99%

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Low content of highly reactive iron in sediments from Prydz Bay and the adjacent Southern Ocean: Controlling factors and implications for sedimentary organic carbon preservation

et al. 2023

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Examining iron (Fe) speciation in marine sediments is critical to understand Fe and carbon biogeochemical cycling in polar regions. In this study, we investigated the speciation of Fe in sediments from Prydz Bay and the adjacent Southern Ocean, and examined the factors controlling Fe speciation and its relationship with total organic carbon (TOC). Our results reveal that unreactive silicate Fe (FeU) is the dominant pool of total Fe (FeT), followed by poorly reactive sheet silicate Fe (FePRS), reducible crystalline Fe oxides (Feox2), easily reducible amorphous/poorly crystalline Fe oxides (Feox1), and magnetite (Femag), with carbonate-associated ferrous Fe (Fecarb) being the smallest pool. The highly reactive Fe (FeHR)/FeT ratios (0.13 ± 0.06) in our study area are among the lowest end-member globally, primarily due to weak bedrock weathering and slow glacier melting. The Feox1/FeT ratios are similar to those in continental shelf and marginal seas containing highly weathered materials, while the Feox2/FeT ratios are significantly lower. This result implicates that low temperature inhibits the aging of iceberg melting-sourced Feox1 potentially, and accordingly the regulation of weathering on the FeHR/FeT ratio is mainly reflected in Feox2/FeT ratio. There are no significant correlations between TOC and FeHR, Fecarb, Feox1 or Feox2 in the research region. Four distinct patterns of TOC/FeHR ratio can be discerned by summarizing the global data set: (a) high TOC/FeHR ratios (> 2.5) are likely the result of high marine primary productivity and low chemically weathered source materials; (b) low TOC/FeHR ratios (< 0.6) are caused by high rates of FeHR inputs and OC remineralization; (c) mid-range TOC/FeHR ratios (0.6 – 2.5) typical of most river particulates and marginal sea sediments indicate the same FeHR and OC sources and/or interactions between each other; (d) both low TOC and FeHR content is the result of low marine primary productivity and weak chemical weathering. Our findings provide new insights into the relationship between FeHR and TOC in polar sediments.

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Section: Relationship Between Fe Hr and Toccontrasting

confidence: 54%

Section: Total Fe and Fe Speciationmentioning

confidence: 97%

Section: Total Fe and Fe Speciationmentioning

confidence: 99%

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Low content of highly reactive iron in sediments from Prydz Bay and the adjacent Southern Ocean: Controlling factors and implications for sedimentary organic carbon preservation

et al. 2023

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“…(5)) or by sulfide reacting with dissolved iron, iron oxides, and potentially other iron minerals (Eqs. (6) and (7)) (Mortimer et al, 2011;Zhu et al, 2015;Heijs et al, 1999).…”

Section: Profiles Of Fe 2þ In Different Sedimentsmentioning

confidence: 99%

Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China

Sun

Sheng

Yang

et al. 2016

Environmental Pollution

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a b s t r a c tThe cycling of sulfur (S), iron (Fe) and phosphorus (P) in sediments and pore water can impact the water quality of overlying water. In a heavily polluted river estuary (Yantai, China), vertical profiles of fluxes of dissolved sulfide, Fe 2þ and dissolved reactive phosphorus (DRP) in sediment pore water were investigated by the Diffusive Gradients in Thin films technique (DGT). Vertical fluxes of S, Fe, P in intertidal sediment showed the availability of DRP increased while the sulfide decreased with depth in surface sediment, indicating that sulfide accumulation could enhance P release in anoxic sediment. In sites with contrasting salinity, the relative dominance of iron and sulfate reduction was different, with iron reduction dominant over sulfate reduction in the upper sediment at an intertidal site but the reverse true in a freshwater site, with the other process dominating at depth in each case. Phosphate release was largely controlled by iron reduction.

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Evaluation of contaminants spreading from sludge piles, applying geochemical fractionation and attenuation of concentrations model in a tropical reservoir

Wasserman

Almeida

Pérez

et al. 2019

Environ Monit Assess

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Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Cited by 13 publications

References 68 publications

Low content of highly reactive iron in sediments from Prydz Bay and the adjacent Southern Ocean: Controlling factors and implications for sedimentary organic carbon preservation

Low content of highly reactive iron in sediments from Prydz Bay and the adjacent Southern Ocean: Controlling factors and implications for sedimentary organic carbon preservation

Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China

Evaluation of contaminants spreading from sludge piles, applying geochemical fractionation and attenuation of concentrations model in a tropical reservoir

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