Partitioning of rare earth elements (REEs) between calcite and seawater solutions at 25°C and 1 atm, and high dissolved REE concentrations

Zhong, Sheng; Mucci, Alfonso

doi:10.1016/0016-7037(94)00381-u

Cited by 330 publications

(253 citation statements)

References 36 publications

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“…REEs have relatively short residence time (several hundred years; Alibo and Nozaki, 1999) and are lithophile elements that invariably occur together naturally because all are trivalent (except for Ce þ4 and Eu þ2 in certain environments) and have similar ionic radii with chemical characteristics that change systematically along the series, which results in the preferential absorption of LREE relative to MREE and HREE in seawater (Sholkovitz and Shen, 1995). Their incorporation into calcite (biogenic and abiogenic) lies within a relatively narrow range of partition coefficient values (Zhong and Mucci, 1995), and thus observed variation in the series is a reflection of oceanic composition and/or nature of fluids that deposited the carbonates and other processes. Redox conditions control the conversion and distribution of Cerium (Ce) and to a lesser degree Europium (Eu) (Sholkovitz et al, 1994); hence both elements provide further information on process controlling parameters.…”

Section: Rare Earth Elements (Ree)mentioning

confidence: 99%

Origin of Lower Ordovician dolomites in eastern Laurentia: Controls on porosity and implications from geochemistry

Azomani

Azmy

Blamey

et al. 2013

Marine and Petroleum Geology

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a b s t r a c tThe Catoche Formation of the St. George Group in eastern Laurentia (western Newfoundland) consists of early Ordovician (Arenigian) shallow marine platform carbonates (w160 m thick), which were extensively dolomitized during the course of their diagenetic history. The dolomites occur as both replacement and pore-filling cements and are a major control on porosity distribution in the formation. The origin and diagenetic history of the Catoche dolomites at Daniel's Harbour (western Newfoundland) were analysed in comparison to equivalent successions at Port au Choix (PaC) and Port au Port Peninsula (PaP) to assay the reservoir potential of these dolomites in eastern Laurentia. Petrographic examination identified at least three generations of dolomites in the Catoche Formation, which are: (1) an early replacement sub-to eu-hedral micritic dolomite (<4 mme30 mm, D1), (2) eu-to sub-hedral dolomite (70 mme1 mm) often with cloudy cores and clear rims (D2), and (3) subhedral to anhedral saddle dolomite cement (200 mme3 mm, D3). The micritic dolomite (D1) exhibits a dull cathodoluminescence (CL) under cathodoluminoscope, whereas dolomite D2 exhibits consistent concentric CL zonation. Some subhedral crystals of D3 appear zoned both in plane polarized light and cathodoluminoscope, otherwise D3 exhibits a dull CL. Stoichiometric dolomite occurs in all three generations with D2 as the dominant dolomite by abundance.The low strontium (47 ± 25 ppm) content coupled with depleted d 18 O value of dolomitizing fluids (-10 to -11.2& VSMOW) and near-micritic grain size, suggests an early precipitation of dolomite D1 at low temperatures of near-surface conditions from solutions likely formed by mixing of early Ordovician sea and meteoric waters. In contrast, microthermometric measurements of primary two-phase fluid inclusions in dolomite D2 (homogenization temperatures of 102e168 o C with a salinity range of 19.8e25 eq wt% NaCl) and dolomite D3 (homogenization temperatures of 158e190 o C with a salinity range of 20.2e22.2 eq wt% NaCl), suggest that both dolomite generations were generated in mid to deep burial settings from high salinity, low temperature (<200 o C) hydrothermal fluids likely under suboxic conditions. This is consistent with the low Sr concentrations for D2 (36.4 ± 8 ppm) and D3 (38.7 ± 9 ppm), d 18 O values of dolomitizing fluids for D2 (þ2.1 to þ8.1&, VSMOW) and D3 (þ6 to þ8.1& VSMOW), coupled with Fe contents of D2 (1684 ± 1096 ppm) and D3 (1783.7 ± 618 ppm) as well as the respective Mn (D2 ¼ 131.2 ± 50 and D3 ¼ 197.5 ± 55 ppm) concentrations.SREE and shale normalized (REESN) values of Catoche carbonates indicate enrichment in rare earth element (REE) composition of the earliest calcite (C1) relative to those of Arenig seawater, whereas the REESN profiles of the dolomite generations mimic that of calcite C1. The Ce (Ce/Ce*)SN and La (La/La* ¼ Pr/Pr*)SN anomalies of the Catoche dolomites are consistent with precipitation in equilibrium with source fluids in slightly oxic to suboxic conditions whereas Eu...

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Section: Rare Earth Elements (Ree)mentioning

confidence: 99%

Origin of Lower Ordovician dolomites in eastern Laurentia: Controls on porosity and implications from geochemistry

Azomani

Azmy

Blamey

et al. 2013

Marine and Petroleum Geology

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“…Many studies have investigated the adsorption and incorporation of 101 environmentally relevant elements onto/into calcite (Blanchard and Baer, 1992 Zhong and Mucci, 1995). Wang and Liu (2005) were able to show that calcite has a significant 104 impact on the mobility of selenium in soils.…”

Section: Introduction 67mentioning

confidence: 99%

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Heberling

Vinograd

Polly

et al. 2014

Geochimica et Cosmochimica Acta

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“…REEs are a group of fifteen trivalent elements (La to Lu) with chemical characteristics that change systematically along the series, and in seawater this lanthanide contraction leads to preferential absorption of the light REEs (LREE) relative to the medium (MREE) and heavy REEs (HREE; Sholkovitz and Shen, 1995 ). Their incorporation into calcite (bLMC and aLMC) falls within a relatively narrow range of partition coefficient values ( Zhong and Mucci, 1995), and thus observed variation in the series is a reflection of natural oceanographic and other processes. One of these processes, oxidation, controls the conversion of Ce (III) to Ce (IV) in seawater (Sholkovitz et al, 1994), and the distribution of Eu in seawater is controlled by the same process.…”

Section: Introductionmentioning

confidence: 99%

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

et al. 2011

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Biogenic low-Mg calcite (brachiopods) Burial calcite cements lREE, REESN seawater compositions Diagenetic lREE and REEsN variations The l;REE and shale-normalized (PAAS) REEsN values of modern brachiopods (biogenic low-Mg calcite: blMC) represented by several species from high-to low latitudes, from shallow-to deep waters and from warm-and cold-water environments, define three distinct average 'seawater' trends. The warm-and cold-water brachiopods define two indistinguishable (p < O.OSO) groups that mimic open -ocean seawater REE chemistry, exhibiting the typical LREE enrichment with a slightly positive to negative Ce anomaly followed by an otherwise invariant series. Other recent brachiopods from an essentially siliciclastic seabed environment are distinct in both l;REE and REEsN trends from the previous two populations, showing a slight enrichment in the MREEs and an increasing trend in the HREEs. Other groups of modern brachiopods are characterized by elevated REEsN trends relative to the 'normal'groups as well as by complexity of the series trends.The most characteristic feature is the decrease in the HREEs in these brachiopods from areas of unusual productivity (i.e., such as upwelling currents, fluvial input and aerosol dust deposition). Preserved brachiopods from the Eocene and Silurian exhibit REEsN trends and Ce anomalies similar to that of the 'open-ocean' modern brachiopods, although, their enriched l;REE concentrations suggest precipitation ofblMC influenced by extrinsic environmental conditions. Preservation of the bLMC was tested by comparing the l;REE and REEsN trends of preserved Eocene brachiopods to those of Oligocene brachiopods that were altered in an open diagenetic system in the presence of phreatic meteoric-water. The altered blMC is enriched by approximately one order of magnitude in both l;REE and REEsN trends relative to that in blMC of their preserved counterparts. Similarly, the l;REE and REEsN of preserved Silurian brachiopod blMC were compared to those of their enclosing altered lime mudstone, which exhibits features of partly closed system, phreatic meteoric-water diagenesis. Despite these differences in the diagenetic alteration systems and processes, the l;REEs and REEsN trends of the blMC of altered brachiopods and of originally mixed mineralogy lime mudstones (now diagenetic low-Mg caldte) are enriched by about one order of magnitude relative to those observed in the coeval and preserved blMC. In contrast to the changes in l;REE and REEsN of carbonates exposed to phreatic meteoric-water diagenesis, are the REE compositions oflate burial calcite cements precipitated in diagenetically open systems from burial fluids. The l;REE and REEsN trends of the burial cements mimic those of their host lime mudstone, with all showing slight LREE enrichment and slight HREE depletion, exhibiting a 'chevron' pattern of the REEsN trends.The overall enrichment or depletion of the cement REEsN trends relative to that of their respective host rock material reflects not only the openness of the diag...

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Partitioning of rare earth elements (REEs) between calcite and seawater solutions at 25°C and 1 atm, and high dissolved REE concentrations

Cited by 330 publications

References 36 publications

Origin of Lower Ordovician dolomites in eastern Laurentia: Controls on porosity and implications from geochemistry

Origin of Lower Ordovician dolomites in eastern Laurentia: Controls on porosity and implications from geochemistry

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Biogenic and abiogenic low-Mg calcite (bLMC and aLMC): Evaluation of seawater-REE composition, water masses and carbonate diagenesis

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