Geochemistry of manganese in the Kalix River, northern Sweden

Pontér, Christer; Ingri, Johan; Boström, Kürt

doi:10.1016/0016-7037(92)90218-8

Cited by 94 publications

(34 citation statements)

References 28 publications

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“…There are no significant correlations between exchangeable Al (Al ex ) and Mn ex , exchangeable Fe (Fe ex ) and Mn ex in this work, indicating potentially toxic Mn increase seldom accompanying with Al increase in the two catchments. This is in agreement with Pontér et al (1992) who argued that Fe-pools do not exert an important control on Mn transport. And on acid soils Mn-toxicity is particularly prevalent with decreasing partial pressure of O 2 (Zorn and Prauße, 1993).…”

Section: Correlations Between Amount Of Al- Fe-and Mn-pools and Soilsupporting

confidence: 93%

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

et al. 2006

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Distribution of Al-, Fe-and Mn-pools was investigated in five forest soil profiles (consisting of four horizons) in each of two Hunan catchments (BLT and LKS) where acid deposition has been considered critical. Al-and Fe-pools were higher in BLT than those in LKS, but Mn-pools much lower in BLT. Mn-pools vary from topsoils to bottom soils, but there are different trends for different Mn speciation. Al-and Fe-pools, except amorphous Fe ox , were positively correlated to contents of soil organic matter (OM) showed by the loss on ignition in the two catchments. Accumulation of Al-and Fe-pools may occur in the area where soil organic matter was enriched (e.g. in top soil and rhizosphere soil). However, no direct correlation is observed between Mn and OM. Acidic atmospheric deposition may affect transforming among speciations of Al-, Fe-and Mn-pools and leaching of soil Al, Fe and Mn through formation of soluble organometal dissolved Al which was potentially toxic, increased. There were significant correlations between Al-pools complexes or change of oxidation-reduction conditions. Mn ex (exchangeable Mn) and Mn ox (amorphous and organic Mn) were highly linearly correlation with soil pH values at LKS but at BLT. Under acid deposition, the availability of the nutrient Fe increased with the amount of dissolved Al, which was potentially toxic, in the two catchments. There are no significant correlations between Al ex (exchangeable Al) and Mn ex , Fe ex (exchangeable Fe) and Mn ex in this work, indicating potentially toxic Mn increase seldom accompanying with Al increase in the two catchments.

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Section: Correlations Between Amount Of Al- Fe-and Mn-pools and Soilsupporting

confidence: 93%

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

et al. 2006

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“…The dominant sources for these high amounts of Mn most probably were circum-Arctic rivers. As they drain extensive acidic peat bogs, they are particularly rich in dissolved Mn 2+ [e.g., Telang et al, 1991;Ponter et al, 1992;Hölemann et al, 1999;Gordeev et al, 2004;Hölemann et al, 2005]. In addition, some redox-related elements like Cu, Mo, Ni and Zn (Figure 7) show slight enrichments relative to AS.…”

Section: Middle Miocene To Pleistocene Geochemical Unit Amentioning

confidence: 99%

Paleoenvironmental implications of Cenozoic sediments from the central Arctic Ocean (IODP Expedition 302) using inorganic geochemistry

2010

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[1] Integrated Ocean Drilling Program (IODP) Expedition 302 (Arctic Coring Expedition, ACEX) recovered a unique sediment record from the central Arctic Ocean, revealing that this region underwent major environmental fluctuations since the Late Cretaceous. Major and trace element composition of 1,300 samples were determined using X-ray fluorescence (XRF). The results show significant compositional variability of the sediments with depth that can be attributed to changes in (a) provenance and pathways of detrital material, (b) paleoenvironmental conditions and depositional processes, and (c) diagenetic overprint of the primary record. In addition to existing lithological units, we introduce new geochemical units for a more process-related approach interpreting the ACEX record. In detail, via the geochemical signature of Siberian flood basalts we are able to reconstruct the discontinuous rifting and deepening of the central Lomonosov Ridge during the Paleogene, accompanied by changing current regimes and the onset of sea ice. Eocene biosiliceous sedimentation took place in a relatively shallow setting under predominantly anoxic bottom water conditions, causing a positive anoxia-productivity feedback, although water column stratification was repeatedly interrupted by ventilation events. Anoxic to sulfidic conditions were even more extreme after biosilica production ceased, and significant amounts of pyrite were deposited on the Lomonosov Ridge. Especially in organic matter-rich Paleogene deposits, diagenetic processes obscured the paleoenvironmental signals. Fundamental environmental changes occurred in the Middle Eocene, but geochemical and micropaleontological proxies point not to the identical sediment depth. After approximately 26 Ma of non-deposition or erosion, the Middle Miocene record shows the transition to dominantly oxic bottom water conditions, although suboxic diagenesis seemingly affected these deposits.

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“…Due to weathering and podzolization of till within the Kalix River drainage area, river suspended matter entering the estuary is rich in non-detrital Fe and Mn [presumably Fe-Mn oxides (Pont6r et al, 1992;Ingri and Widerlund, 1994)]. …”

Section: Study Area and Core Descriptionmentioning

confidence: 99%

Redox cycling of iron and manganese in sediments of the Kalix River estuary, Northern Sweden

Widerlund

Ingri

1996

Aquat Geochem

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Iron and manganese redox cycling in the sediment -water interface region in the Kalix River estuary was investigated by using sediment trap data, pore-water and solid-phase sediment data. Nondetrital phases (presumably reactive Fe and Mn oxides) form substantial fractions of the total settling flux of Fe and Mn (51% of Feto~a~ and 84% of Mntotal). A steady-state box model reveals that nondetrital Fe and Mn differ considerably in reactivity during post-depositional redox cycling in the sediment. The production rate of dissolved Mn (1.6 mmol m -~ d -I ) exceeded the depositional flux of nondetrital Mn (0.27 mmol m -2 d-t) by a factor of about 6. In contrast, the production rate of upwardly diffusing pore-water Fe (0.77 mmol m -2 d -1) amounted to only 22% of the depositional flux ofnondetrital Fe (3.5 mmol m -2 d-l). Upwardly diffusing pore-water Fe and Mn are effectively oxidized and trapped in the oxic surface layer of the sediment, resulting in negligible benthic efftuxes of Fe and Mn. Consequently, the concentrations of nondetrital Fe and Mn in permanently deposited, anoxic sediment are similar to those in the settling material. Reactive Fe oxides appear to form a substantial fraction of this buried, non-detrital Fe. The in-situ oxidation rates of Fe and Mn are tentatively estimated to be 0.51 and 0.16-1.7 #mol cm -3 d -i, respectively.

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Geochemistry of manganese in the Kalix River, northern Sweden

Cited by 94 publications

References 28 publications

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

Paleoenvironmental implications of Cenozoic sediments from the central Arctic Ocean (IODP Expedition 302) using inorganic geochemistry

Redox cycling of iron and manganese in sediments of the Kalix River estuary, Northern Sweden

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