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Title: Ion probe measurement of rare earth elements in biogenic phosphates

Abstract

The rare earth element (REE) distributions in individuals fish teeth and conodonts have been measured by ion probe. Concentrations and La/Yb ratios show little variations, except in the enamel, which suggests that REE uptake from the sedimented biogenic debris takes place at the water-sediment interface as an essentially quantitative process without fractionation. Late diagenetic disturbances remained of marginal importance. Hence, REE in phosphatic debris might reflect the input from the overlying water column.

Authors:
;  [1]
  1. (Ecole Nationale Superieure de Geologie (France))
Publication Date:
OSTI Identifier:
6701688
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geochimica et Cosmochimica Acta; (USA); Journal Volume: 53:12
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; PHOSPHATE MINERALS; DIAGENESIS; ION MICROPROBE ANALYSIS; PRECIPITATION; BIOGEOCHEMISTRY; CHEMICAL COMPOSITION; DEPOSITION; FISHES; FRACTIONATION; NEODYMIUM ISOTOPES; RARE EARTHS; SEAWATER; SEDIMENT-WATER INTERFACES; SEDIMENTS; TEETH; ANIMALS; AQUATIC ORGANISMS; CHEMICAL ANALYSIS; CHEMISTRY; DIGESTIVE SYSTEM; ELEMENTS; GEOCHEMISTRY; HYDROGEN COMPOUNDS; INTERFACES; METALS; MICROANALYSIS; MINERALS; NONDESTRUCTIVE ANALYSIS; ORAL CAVITY; OXYGEN COMPOUNDS; SEPARATION PROCESSES; VERTEBRATES; WATER 580000* -- Geosciences

Citation Formats

Grandjean, P., and Albarede, F. Ion probe measurement of rare earth elements in biogenic phosphates. United States: N. p., 1989. Web. doi:10.1016/0016-7037(89)90097-5.
Grandjean, P., & Albarede, F. Ion probe measurement of rare earth elements in biogenic phosphates. United States. doi:10.1016/0016-7037(89)90097-5.
Grandjean, P., and Albarede, F. 1989. "Ion probe measurement of rare earth elements in biogenic phosphates". United States. doi:10.1016/0016-7037(89)90097-5.
@article{osti_6701688,
title = {Ion probe measurement of rare earth elements in biogenic phosphates},
author = {Grandjean, P. and Albarede, F.},
abstractNote = {The rare earth element (REE) distributions in individuals fish teeth and conodonts have been measured by ion probe. Concentrations and La/Yb ratios show little variations, except in the enamel, which suggests that REE uptake from the sedimented biogenic debris takes place at the water-sediment interface as an essentially quantitative process without fractionation. Late diagenetic disturbances remained of marginal importance. Hence, REE in phosphatic debris might reflect the input from the overlying water column.},
doi = {10.1016/0016-7037(89)90097-5},
journal = {Geochimica et Cosmochimica Acta; (USA)},
number = ,
volume = 53:12,
place = {United States},
year = 1989,
month =
}
  • The REE distributions in individual Upper Devonian conodonts have been measured by ion probe. The patterns of all analyzed conodonts are enriched in middle REE (Eu-Gd) and have a weak or no Ce anomaly. Concentrations and La/Yb or La/Sm ratios vary very little within or among individuals from the same zone, which suggests that uptake or labile REE from sediments was essentially quantitative. Therefore, the REE signature of the primary carriers, probably organic and oxyhydroxides particulates from marine suspensions, was efficiently transferred to biogenic apatites and survived late diagenetic processes. REE patterns of conodonts do not resemble those of present-daymore » seawater and post-Cretaceous biogenic phosphates, which are typically depleted in Nd and Sm with a negative Ce anomaly. Since REE distributions in the modern water column mimic those of nutrients, the authors assume that, in pre-Cretaceous seawater, they were not controlled by surface biological activity. They assume instead that REE in pre-Cretaceous seawater can be explained by mechanisms of desorption-adsorption on particle surfaces. Progressive extraction of LREE from river water by oxyhydroxides leads to precipitates enriched in middle REE. A simple quantitative model was calculated in order to illustrate the proposed mechanism. 43 refs., 5 figs., 1 tab.« less
  • The authors investigate the thermal transformations in the double phosphate M/sup I/Ln(PO/sub 3/)/sub 4/ (M/sup I/ = Li, Na, K, Rb, Cs; Ln - La, Eu, Yb) (which is used as laser materials and luminophores) over a wide range of temperatures between room temperature and the temperature of the superheated melt by Raman spectroscopy. This method allowed the investigation of the whole range of thermal transformations, as well as the identification of the crystalline forms in the solid-phase transitions and peritectic dissociation, and the following of the homogenization process in the molten double phosphates. The Raman spectra of the variousmore » structure types of the double phosphates M/sup I/Ln(PO/sub 3/)/sub 4/ are given as are the frequencies of the lines in the Raman spectra and their assignments to the groups of internal and external vibrations of the phosphorus-oxygen anions and also the vibration of the (M/sup I/, Ln)-O bond. The nature of the fusion of M/sup I/Ln(PO/sub 3/)/sub 4/ is also investigated.« less
  • Distribution coefficients for lanthanum, neodymium, yttrium, and ytterbium nitrate extraction by di- and tributyl phosphate were compared, and their relation to the concentratlon of nitric acid and nitrates in aqueous solu tion was determined. In DBP extraction an increase of nitric acid concentration and of rare-earth nitrates diminishes the distribution coefficients while in TBP extraction distribution coefficients increase with the increase of rareearth nitrate concentration. The distribution coefficients are always higher in DBP extraction than in TBP. DBP extraction at low acidity achieves better separation of rare earths than TBP; at high acidity the difference is much smaller. (R.V.J.)