Rare earth element trends and cerium-uranium-manganese associations in weathered rock from Koongarra, Northern Territory, Australia

Koppi, A. J.; Edis, Robert; Field, Damien J.; Geering, H. R.; Klessa, David; Cockayne, D. J. H.

doi:10.1016/0016-7037(96)00047-6

Cited by 107 publications

(48 citation statements)

References 23 publications

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“…This can be attributed to cyclic occurrence of poorly drained conditions (e.g., Koppi et al, 1996). It has been well-established that the type and abundance of oxyhydroxides and associated trace elements are primarily controlled by microenvironmental leaching and redox (oxidation and reduction) conditions (McKenzie, 1989;Koppi et al, 1996).…”

Section: Oxyhydroxidesmentioning

confidence: 99%

Chemical and mineralogical heterogeneities of weathered igneous profiles: implications for landslide investigations

Duzgoren-Aydin

Aydın

2006

Nat. Hazards Earth Syst. Sci.

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Abstract. Landslides in tropical and sub-tropical regions are generally associated with weathered rock profiles which often possess chemical and mineralogical heterogeneities at material-and mineral-scales. Such heterogeneities reach a climax by the occurrences of oxyhydroxide-and clayrich zones. Weakness and low permeability of these zones makes them ideal for the development of slip zones along which landslides take place. This paper describes the nature and distribution of chemical and mineralogical heterogeneities within weathered profiles developed from felsic igneous rocks in Hong Kong. It sets out the use of integrated geochemical and mineralogical studies to improve understanding of the development of critical heterogeneities and hence to predict their types and presence in a given weathered profile.

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Section: Oxyhydroxidesmentioning

confidence: 99%

Chemical and mineralogical heterogeneities of weathered igneous profiles: implications for landslide investigations

Duzgoren-Aydin

Aydın

2006

Nat. Hazards Earth Syst. Sci.

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“…The deposition of Mn-phases, appear to have led to the enrichment of Ce relative to the other REEs. This differential enrichment suggests a redox mediated process involving Mn oxy-hydroxide surfaces (Koppi et al, 1996).…”

Section: +mentioning

confidence: 99%

“…A study on serpentine soils of Ranau, Sabah indicated that over half of the soil Co is associated with Mn-oxide (Tashakor et al, 2011). In Australia, zones rich in Mn oxy-hydroxides occur as coatings on fissure surfaces, contained large concentrations of Ce and U (Koppi et al, 1996). Iron and manganese cycling has been observed to have strong correlation with redox conditions, seasonal fluctuation of boundary conditions and quantity and reactivity of organic matter (Marchand et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Manganese Speciation in Selected Agricultural Soils of Peninsular Malaysia

Habibah¹

2014

American Journal of Environmental Sciences

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Manganese speciation in selected agricultural soils of Peninsular Malaysia is discussed in this study. Manganese concentration in the Easily Leacheable and Ion Exchangeable (ELFE), Acid Reducible (AR), Organic Oxidizable (OO) and Resistant (RR) fractions of soils developed on weathered rocks, soils of mixed nature, alluvium and peat deposits are described. The total manganese concentration in soils developed on weathered rocks was found to be higher than that in soils of mixed nature, alluvium and peat deposits because of the occurrence of resistant manganese oxide at the topsoils. Manganese speciation in paddy soils is influenced by the redox condition resulting from the alternate flooding and drying of the soils. Under reducing conditions, this metal tends to get dissolved and be available for plant uptake. Upon oxidation, manganese is precipitated into the acid reducible fraction as poorly crystalline manganese oxide and hydroxide and/or the resistant Fe-Mn mottles. In non-paddy cultivated alluvial soils, manganese speciation varies widely and is less understood. For the non-paddy cultivated peat soils, manganese is mainly associated with organic material, as indicated by the high manganese concentration in the OO fraction.

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“…The strong association of U with secondary iron oxide minerals has been investigated at numerous U ore deposit sites (Koons et al 1980;Edghill 1991;Koppi et al 1996;Casas et al 2004;Noseck et al 2004;Payne and Airey 2006). An understanding of the interaction between U and iron oxides is very important for assessing the retardation capacity of geological systems into which U may be disposed.…”

Section: Introductionmentioning

confidence: 99%

Uranium and other trace elements’ distribution in Korean granite: implications for the influence of iron oxides on uranium migration

Lee

Baik

2008

Environ Geochem Health

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To understand trace radionuclide (uranium) migration occurring in rocks, a granitic batholith located at the Korea Atomic Energy Research Institute (KAERI) site was selected and investigated. The rock samples obtained from this site were examined using mineralogical methods, including scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The changes in the distribution pattern of uranium (U) and small amounts of trace elements, and the mineralogical textures affected by weathering, were examined. Based on the element distribution analyses, it was found that Fe2+ released from fresh biotite is oxidized in short geological time, forming amorphous iron oxides, such as ferrihydrite, around silicate minerals. In that case, the amorphous ferrihydrite does not show distinct adsorption for U. However, as it gradually crystallizes to goethite or hematite, the most U-rich phases were found to be associated with the secondary iron oxides having granular forms. This evidence suggests that the geological subsurface environment is favorable for the crystallized iron oxides to keep their structures more stable for a long time as compared with the amorphous phases. There is a possibility that the long residence of U which is in contact with the stable crystalline phases of iron may finally lead to the partial sequestration of U in their structure. Consequently, it seems that Fe-oxide crystallization can be a dominating mechanism for U uptake and controls long-term U transport in granites with low U contents.

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Rare earth element trends and cerium-uranium-manganese associations in weathered rock from Koongarra, Northern Territory, Australia

Cited by 107 publications

References 23 publications

Chemical and mineralogical heterogeneities of weathered igneous profiles: implications for landslide investigations

Chemical and mineralogical heterogeneities of weathered igneous profiles: implications for landslide investigations

Manganese Speciation in Selected Agricultural Soils of Peninsular Malaysia

Uranium and other trace elements’ distribution in Korean granite: implications for the influence of iron oxides on uranium migration

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