Geochemical behaviour of lanthanoid elements in some clays and bauxite.

Christie, Olav H. J.; Roaldset, E.

doi:10.2343/geochemj.13.11

Cited by 10 publications

(3 citation statements)

References 12 publications

(4 reference statements)

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“…The REE concentrations were determined by a modified GEC/AEI MS 702 spark source mass spectrometer (Taylor, 1965;Nicholls et al, 1967). The analytical procedure has been described by Roaldset & Christie (1975) and Prestvik & Roaldset (1978). Analytical precision (the relative standard deviation of the concentration of one constituent based on measurements of several isotope peaks in one spectrum) was 8~ and accuracy within sample (the relative standard deviation of the concentration of one element obtained from measurements of different spectra of the same sample) was 10~o.…”

Section: Methodsmentioning

confidence: 99%

Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Roaldset¹

1979

Clay miner.

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The distribution of rare earth elements (REE) in two different sediments, a marine clay and a till, was found to be dependent both on grain size and mineralogical composition. In the marine clay the REE content was highest in the coarsest fraction; in the till REE were markedly enriched in the finest fraction. Detrital and authigenic origins for different size fractions have been attributed on the basis of REE contents.

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Section: Methodsmentioning

confidence: 99%

Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Roaldset¹

1979

Clay miner.

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“…The fresh metavolcanics have the highest contents of all REEs and next comes the altered one. The negative Eu anomaly is due to its higher mobility during weathering and metamorphism (Christie and Roaldset, 1979;Duddy, 1980;Banerjee, 1990;Subrahmanyam and Gurna, 1994;and Braun et al, 1998).…”

Section: µV)mentioning

confidence: 99%

Dholkata Bauxite Deposit on Metavolcanics, Keonjhar District, Orissa, India

Nayak

Das

2005

Resource Geology

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. The Dholkata bauxite deposit of Keonjhar district, Orissa, has developed on the metavolcanics of tholeiitic basalt composition. The weathered profile reveals five distinct altered zones, such as topsoil, laterite, bauxite, lithomarge and altered metavolcanics. The mineralogy of different zones studied in a representative pit shows the association of major mineral constituents like gibbsite, goethite, hematite, kaolinite, limonite and quartz. Gibbsite is the most dominant one followed by goethite and hematite in the bauxite zone. The geochemical study of all weathering zones indicates the geochemical affinity of the elements Ni, Th and U for laterites and Cr, Zr and Hf for bauxites to occur in high quantities. Trend surface maps predict the bauxite zones in the different levels of the deposit. If the zones having A12O3 35–40 % are blended with high grade ores, the deposit may prove to be a potential one.

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“…5) do not show significant variation except sharp impoverishment in Sm and minor depletion in Eu. The eigenvector analysis as used by Christie and Roaldset (1979) indicated that differentiation of individual lanthanides may occur in the sedimentary environments. The deviation of Sm from the smooth (normalized) curve is not to be considered as errors in the analytical work, but may reflect certain diagenetic peculiarities from the following criteria.…”

Section: Ree Patternsmentioning

confidence: 99%

Geochemistry and REE patterns for terrestrial and marine skeletal apatites from Egypt.

El-Kammar

1985

J. Japan. Assoc. Min. Petr. Econ. Geol.

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The present paper reports data on the chemical composition and rare earth element (REE) patterns of terrestrial scutes of turtles and crocodiles from the L. Oligocene Qatrani Foration of the Fayoum Depression, as well as marine shark teeth from the U. Cretaceous phosphate Forma tion of the Abu Tartur plateau. Generally both terrestrial and marine apatites are carbonatefluorapatites. The terrestrial variety contains less F, less heavy metals and less substitution in Ca and P sites than the marine ones do. Post-depositional activities would have caused significant depletion in Sm, as well as other REE, and enriched the terrestrial apatites with uranium. The Marine shark teeth are poor in REE and they are relatively far over toward enrichment in light lanthanides. The tooth's enamel accumulates less REE compared to its dentine. The normalized REE patterns of the terrestrial apatites are more flat compared to those of the marine origin. The plot of La/Ce versus Eu/Sm discriminates remarkably between the marine and terrestrial apatites.

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Geochemical behaviour of lanthanoid elements in some clays and bauxite.

Cited by 10 publications

References 12 publications

Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Rare earth elements in different size fractions of a marine quick clay from Ullensaker, and a till from Upper Numedal, Norway

Dholkata Bauxite Deposit on Metavolcanics, Keonjhar District, Orissa, India

Geochemistry and REE patterns for terrestrial and marine skeletal apatites from Egypt.

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