The aqueous geochemistry of the rare earth elements. Part XIV. The solubility of rare earth element phosphates from 23 to 150 °C

Çetiner, Ziya S.; Wood, Scott A.; Gammons, Christopher H.

doi:10.1016/j.chemgeo.2005.01.001

Cited by 135 publications

(76 citation statements)

References 36 publications

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“…Although the solubilities of the REE-phosphates monazite and xenotime are extremely low in water at low temperatures (Wood, 1990), some highly aggressive fluids may partially or totally alter monazites even at low temperatures (Oelkers and Poitrasson, 2002). This has also been found by Cetiner et al (2005) who showed that REE-phosphate solubility is strongly governed by pH. In their study, the solubility of the REE phosphates decreases strongly with increasing pH.…”

Section: Resultssupporting

confidence: 55%

“…Rock glacier outflows KG-1, KG-2, and KG-3 are characterized by high conductivity values, high concentrations of the major ions sulfate, calcium, and magnesium, an acidic pH, high metal concentrations (e.g. for aluminium and nickel), and high silica concentrations ( Cetiner et al, 2005), and a related release of metals as induced by pyrite oxidation (Strauhal et al, 2016), which can be strongly enhanced by microbial activity (Sonnleitner et al, 2011). Aquifer geochemistry of some slopes in the Upper Kauner Valley (Tyrol, Austria) has been shown to be controlled by water-rock interactions in strongly fractured and heavily weathered metamorphic rocks of the Ötztal-Stubai Basement Complex, which release highly mineralised but mostly circumneutral groundwater dominated by calcium, magnesium, and sulfate (Strauhal et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

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Peculiar arsenic, copper, nickel, uranium, and yttrium-rich stone coatings in a high mountain stream in the Austrian Alps

Thies¹,

Nickus²,

Tessadri³

et al. 2018

AJES

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Peculiar coatings rich in arsenic, copper, nickel, uranium, and yttrium were found to cover stones in a high mountain stream downstream of the confluence of small acidic tributaries, which emerge at the front of the Krummgampen rock glacier (Ötztal Alps, Tyrol, Austria). The hard mineral coatings are characterized by a white color, a x-ray amorphous structure and showed properties of hydrous aluminium silicates like allophane (Al O (SiO ) x n H O) and/or imogolite (Al SiO (OH) ). Main constituents of the coatings are aluminium, silica, and sulfur. Contrary to high concentrations of arsenic, copper, nickel, uranium, and yttrium in the stream stone coatings, corresponding element values are below the limit of detection both in the Krummgampen stream and -except for nickel and traces of copper -also in acidic outflows from the rock glacier. Stone coatings are neither present in rock glacier outflows nor in the Krummgampen stream upstream of the rock glacier, nor in other streams in the catchment. The coatings are interpreted as a precipitate on or an accretion to stone surfaces in the Krummgampen stream, which is characterized by moderate solute concentrations and a neutral pH. In acidic outflows of the rock glacier high concentrations of dissolved sulfate, calcium, magnesium, silica, aluminium, manganese, and nickel prevail. Some constituents of stream stone coatings like arsenic, copper, nickel, uranium, and yttrium have also been measured in paragneiss rocks in the catchment of the rock glacier which are characterized by heavily weathered accessory minerals monazite, xenotime, and pyrite. It is therefore very likely that minerals which occur in the bedrock of the catchment represent a major source for elements accumulated in stream stone coatings even though processes like element release from the ice-rock matrix in the rock glacier, transport to and accumulation on Krummgampen stream stone surfaces are not yet completely understood.____________________________________________________

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Peculiar arsenic, copper, nickel, uranium, and yttrium-rich stone coatings in a high mountain stream in the Austrian Alps

Thies¹,

Nickus²,

Tessadri³

et al. 2018

AJES

View full text Add to dashboard Cite

show abstract

“…Using the parameters K s0 = 10 −25.7 [47] and η = 2 for LaPO 4 , the value of Ω at pH 1 was calculated in the present study to be four orders of magnitude smaller than that at pH 5 due to the smaller amount of PO 4 3− (Table 7).…”

Section: Properties Of Repo 4hyd Formed At Room Temperaturementioning

confidence: 98%

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Ochiai

Utsunomiya

2017

Minerals

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Abstract:In order to understand the crystal chemical properties of hydrous rare-earth (RE) phosphates, REPO 4,hyd , that form at ambient temperature, we have synthesized REPO 4,hyd through the interaction of aqueous RE elements (REEs) with aqueous P at room temperature at pH < 6, where the precipitation of RE hydroxides does not occur, and performed rigorous solid characterization. The second experiment was designed identically except for using hydroxyapatite (HAP) crystals as the P source at pH constrained by the dissolved P. Hydrated RE phosphate that precipitated at pH 3 after 3 days was classified into three groups: LREPO 4,hyd (La → Gd) containing each REE from La-Gd, MREPO 4,hyd (Tb → Ho), and HREPO 4,hyd (Er → Lu). The latter two groups included increasing fractions of an amorphous component with increasing ionic radius, which was associated with non-coordinated water. RE all PO 4,hyd that contains all lanthanides except Pm transformed to rhabdophane structure over 30 days of aging. In the experiments using HAP, light REEs were preferentially distributed into nano-crystals, which can potentially constrain initial RE distributions in aqueous phase. Consequently, the mineralogical properties of hydrous RE phosphates forming at ambient temperature depend on the aging, the pH of the solution, and the average ionic radii of REE, similarly to the well-crystalline RE phosphates.

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“…Interaction with a cooling deuteric fluid is the most likely cause of this breakdown, imparting a negative Y anomaly. However, the REE would rapidly reprecipitate owing to the low solubility of monazite-(Ce) (Poitrasson et al 2004;Cetiner et al 2005;Louvel et al 2015;Zhou et al 2016). The C and O data for strontianite, in equilibrium with the monazite-(Ce), indicate that no meteoric water input is required for this process.…”

Section: Source Of Ree Mineralising Fluid(s) and Nature Of The Mineramentioning

confidence: 99%

Deducing the source and composition of rare earth mineralising fluids in carbonatites: insights from isotopic (C, O, 87Sr/86Sr) data from Kangankunde, Malawi

Broom-Fendley

Wall

Spiro

et al. 2017

Contrib Mineral Petrol

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The aqueous geochemistry of the rare earth elements. Part XIV. The solubility of rare earth element phosphates from 23 to 150 °C

Cited by 135 publications

References 36 publications

Peculiar arsenic, copper, nickel, uranium, and yttrium-rich stone coatings in a high mountain stream in the Austrian Alps

Peculiar arsenic, copper, nickel, uranium, and yttrium-rich stone coatings in a high mountain stream in the Austrian Alps

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Deducing the source and composition of rare earth mineralising fluids in carbonatites: insights from isotopic (C, O, 87Sr/86Sr) data from Kangankunde, Malawi

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