Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation

Feng, Jing-Chun

doi:10.1016/j.gexplo.2010.10.010

Cited by 44 publications

(22 citation statements)

References 72 publications

(124 reference statements)

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“…Stratigraphic position of the studied sections indicated by shadow bar pected to be similar to that in clastic rocks, or in weathered profiles developed on magmatic rocks. In these cases, longer exposure to weathering factors causes residual enrichment in thorium (Galan et al 2007;Fernandez-Caliani and Cantano 2010), along with progressive diminution of uranium (Feng 2011;Carpentier et al 2013). During exposure, thorium can also be supplied from external sources, e.g.…”

Section: Methodsmentioning

confidence: 99%

“…During exposure, thorium can also be supplied from external sources, e.g. by wind, which may additionally increase its concentration (Feng 2011). In the case of development of thicker weathering profiles, the thorium and uranium concentrated in the clay fraction accumulate in deeper horizons (Taboada et al 2006), which protects the Th-bearing insoluble phases from mechanical washing out into the basin.…”

Section: Methodsmentioning

confidence: 99%

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Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine)

Łuczyński¹,

Kozłowski²,

Skompski³

2015

Acta Geologica Polonica

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ABSTRACT:Łuczyński, P., Kozłowski, W. and Skompski, S. 2015. Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine). Acta Geologica Polonica, 65 (3), 297-318. Warszawa.The term "re-flooding window" was recently proposed as a time-interval connected with the transgressive stage of present day peri-reefal development. In the analysis presented here, a fossil record of a re-flooding window has been recognized. Nine Late Silurian carbonate sections exposed on the banks of the Dnister River in Podolia (Ukraine) have been correlated base on bed-by-bed microfacies analysis and spectral gamma ray (SGR) measurements. Correlated were sections representing settings ranging from the inner part of a shallow-water carbonate platform to its slope, through an organic buildup. The reconstructed depositional scenario has been divided into six development stages, with the first three representing a regressive interval and the latter three a transgressive interval of the basin's history. The re-flooding window has been identified at the beginning of a transgressive part of the succession. Surprisingly, it is characterized by an extremely fast growth of a shallow, tide-dominated platform and by deposition of calciturbiditic layers in a more basinal area. The interpreted succession is a small-scale model illustrating the reaction of carbonate depositional sub-environments to sea level changes and determining the facies position of the stromatoporoid buildups within the facies pattern on a Silurian shelf. The use of SGR analyses in shallow water, partly high-energy, carbonate facies, both for correlation purposes and for identifying depositional systems, is a relatively new method, and thus can serve as a reference for other studies of similar facies assortment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine)

Łuczyński¹,

Kozłowski²,

Skompski³

2015

Acta Geologica Polonica

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“…Ferromanganese concretions (FMCs) occur mainly in soils and in lacustrine and pelagic sediments (McKenzie, 1975;Williams and Owen, 1992;Verlaan et al, 2004;Feng, 2010Feng, , 2011. Marine FMCs have been extensively studied because of their economic potential (Calvert and Piper, 1984;Ahmad and Husain, 1987;Glasby et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

“…Mn and Fe are important elements for plant and animal nutrition (Liu et al, 2002). In addition, oxides and/or hydroxides of both Mn and Fe are the main Mn-Fe phases in the soils, and they often act as strong scavengers of trace elements during weathering and pedogenesis (Burns, 1976;McKenzie, 1980;Bellanca et et al, 1985;Latrille et al, 2001;Liu et al, 2002;Cornu et al, 2005), few have focused on the distribution of trace elements in FMCs at different depths in the soil profile (Feng, 2010(Feng, , 2011. There is also a lack of information both on the direct quantitative relationship between MnFe phases and trace elements, and on the comparative capacities of the Mn-and Fe-phases to retain trace elements in FMCs at different depths and in various pedoenvironments (Chao and Theobald, 1976).…”

Section: Introductionmentioning

confidence: 99%

“…Some TR is not the product of weathering in situ, and therefore does not have a close genetic relationship with the carbonate rocks underlying it, and probably does not provide the best opportunity for uncovering the behavior of trace elements during karst weathering (Feng et al, 2009a, b); however, trace elements have been used to determine TR origin (Whitehead et al, 1993;Ji et al, 2004;Mee et al, 2004;Muhs and Budahn, 2009;Muhs et al, 2010). Whatever the case may be, a sound knowledge of the geochemical behavior of trace elements during karst weathering and pedogenesis is required for logically tracing the TR origin (Feng, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

et al. 2012

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The distributions of trace elements in ferromanganese concretions (FMCs) and the surrounding terra rossa (TR) matrix overlying dolomite have been examined to extend our understanding of their mobilization, redistribution and fractionation during karst weathering and pedogenesis. This study demonstrates that the characteristics of trace elements in TR have been severely overprinted by weathering and pedogenetic processes. The composition of trace elements in FMCs within TR soil profiles varies greatly with depth. The concentrations of Be, Ni, Cu, Zn, As and Bi in FMCs fluctuate and tend to increase with depth; other trace element concentrations fluctuate in the profile but show no clear trend. The toxic elements Cr, As, Cd, Tl and Pb, as well as Co, are significantly enriched in FMCs relative to the surrounding TR matrix: arsenic exhibits strong affinity with Fe, but Cr and Cd contents are not significantly correlated with either Mn or Fe. Correspondingly, Co, Tl and Pb are related to the Mn in FMCs rather than the Fe. In FMCs, trace element distribution and partitioning in the Mn-Fe phases are governed by the location-specific formational pedoenvironment, with the weathering front etching downwards. Experiments with simulated acid rain indicate that desorption of elements from FMCs is generally pH-dependent regardless of the variation of the released amounts and their desorbability. Moreover, it seems that toxic elements bonded to Mn-phase were easily desorbed from FMCs. As a result, the bioavailability, mobility and activity of some toxic elements in FMCs and TR are potentially increased in field areas experiencing severe soil erosion and acid rain.

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Behavior and Impact of Zirconium in the Soil–Plant System: Plant Uptake and Phytotoxicity

Shahid

Ferrand

Schreck

et al. 2012

Reviews of Environmental Contamination and Toxicology Volume 221

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Zirconium (Zr) is a transition metal that has both stable and radioactive isotopes.This metal has gained significant attention as a major pollutant of concern, partly because it has been prominent in the debate concerning the growing anthropogenic pressure on the environment. Its numerous past and present uses have induced significant soil and water pollution. Zr is generally considered to have low mobility in soils. The behavior of Zr particularly depends on the characteristics of the media in which it exists, and even its presence in the biosphere as a contaminate may affect its behavior. In this chapter, we describe the relationship between the behavior of Zrand its speciation in soils, its uptake and accumulation by plants, its translocation and toxicity inside plants, and mechanisms by which plants detoxify it.Zr is abundant and occurs naturally in the earth's crust. Zr emissions to the atmosphere are increasing from anthropogenic activities such as its use in industry and nuclear reactors. Zr forms various complexes with soil components, which reduces its soil mobility and phytoavailabilty. The mobility and phytoavailabilty of Zr in soil depend on its speciation and the physicochemical properties of soil that include soil pH, texture, and organic contents. Despite having low soil mobility and phytoavailability,amounts of Zr are absorbed by plants, mainly through the root system and can thereby enter the food chain.After plant uptake, Zr mainly accumulates in root cells. Zr does not have any known essential function in plant or animal metabolism. Although little published data are available, we conclude that the phytotoxicity of Zr is generally low.Notwithstanding, Zr can significantly reduce plant growth and can affect plantenzyme activity. When exposed to Zr-induced toxicity, plants possess numerous defense mechanisms to cope with the toxicity. Such strategies include Zr sequestration in plant roots and activation of various antioxidants. Because Zr may have impact on the biosphere, we believe it deserves to be evaluated in supplementary studies that will enhance the understanding of its behavior in soil-plant systems.

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Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation

Cited by 44 publications

References 72 publications

Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine)

Regressive-transgressive cyclothem with facies record of the re-flooding window in the Late Silurian carbonate succession (Podolia, Ukraine)

Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption

Behavior and Impact of Zirconium in the Soil–Plant System: Plant Uptake and Phytotoxicity

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