Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms

Lumiste, Kaarel; Lang, Liisa; Paiste, Päärn; Lepland, Aivo; Kirsimäe, Kalle

doi:10.1016/j.chemgeo.2021.120590

Cited by 15 publications

(3 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…REE concentration differences could also be linked to P 2 O 5 concentrations of the sediment (i.e., the abundance of phosphatic grains); considering the crystallo-chemical control of CFA on REE, high P 2 O 5 phosphates would contain more REE in the bulk rock. The crystallographic control of CFA on REE is well documented in different phosphate deposits (Jarvis et al, 1994;Lumiste et al, 2021Lumiste et al, , 2019. LA-ICP-MS microanalyses of different mineral phases of the High Atlas phosphates revealed that REE are mostly associated with CFA (Aubineau et al, 2022a).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 96%

Post-phosphogenesis processes and the natural beneficiation of phosphates: Geochemical evidence from the Moroccan High Atlas phosphate-rich sediments

et al. 2023

View full text Add to dashboard Cite

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 96%

Post-phosphogenesis processes and the natural beneficiation of phosphates: Geochemical evidence from the Moroccan High Atlas phosphate-rich sediments

et al. 2023

View full text Add to dashboard Cite

“…Similarly, Chen et al [95] reported that the ferromanganese oxides from 4071m water depth in the Gagua Ridge had negative Y anomalies. Lumiste et al [96] indicated that the negative Y-anomalies were inherited from Fe-Mn oxides that delivered the REE to the pore water.…”

Section: Rare-earth Element Geochemistrymentioning

confidence: 99%

Geochemical Evidence of Ediacaran Phosphate Nodules in the Volyno-Podillya-Moldavia Basin, Ukraine

et al. 2023

View full text Add to dashboard Cite

The sedimentary basin of Podillya (Volyno-Podillya-Moldavia) is situated in the southwest of the Ukrainian crystalline shield and belongs to the middle part of the Upper Neoproterozoic section of the Moguiliv-Podilska Group. By analyzing the primary oxide, trace, and rare-earth element compositions of the phosphate nodules in the area, this study sought to shed light on the potential precipitation characteristics of the Ediacaran Sea, where phosphate nodules were created. The mean major oxide contents of the nodules were 50.8 wt.% CaO, 34.2 wt.% P2O5, 5.29 wt.% SiO2, 4.77 wt.% LOI, 1.69 wt% Fe2O3, 1.63 wt% Al2O3, and 0.35 wt.% MnO. The average trace element concentrations were 183 ppm Ba, 395 ppm Sr, 13.4 ppm Ni, 32.7 ppm Cr, 62.2 ppm Zn, 764 ppm Y, 16 ppm V, 10.8 ppm As, 75.8 ppm Cu, 84 ppm Pb, 2.1 ppm U, 1.7 ppm Th, and 4.2 ppm Co. The trace element contents were generally low and indicated an assemblage of Cu, Y, As, Cd, and Pb enrichments in comparison to PAAS. The total REE concentrations varied from 1638 ppm to 3602 ppm. The nodules had medium REE (MREE) enrichments and showed similar REE patterns normalized to PAAS. All the nodules had strongly negative Ce, Pr, and Y anomalies and substantially negative Eu anomalies, with four samples being exceptions. These abnormalities suggest that oxic and suboxic sea conditions existed at the time the nodules formed. The extremely high REE concentrations are thought to be the result of REEs being redistributed between the authigenic and detrital phases that were created during the diagenetic equilibration of phosphate with pore water. The genetic hypothesis for phosphate nodule formation states that the nodules were generally formed in oxic and suboxic seawater and were precipitated on slopes in response to a significant upwelling from a deeper basin with abundant organic matter under anoxic/suboxic conditions. The majority of the organic material at the water–sediment interface of the seafloor underwent oxidation before phosphate was released into the pore water of the sediment.

show abstract

“…The abundance of phosphatic detritus and the presence of organic-rich mudstones have been interpreted to reflect a nutrient-rich palaeoenvironment with high primary productivity (Artyushkov et al 2000;Baturin and Ilyin 2013). Previous studies have shown that shelly phosphorite deposits are highly variable in the mineralisation characteristics of phosphates, the type of accessory phases, the state of preservation, and consequently are likely to reflect alteration under somewhat different diagenetic environments (Nemliher and Puura 1996;Lang et al 2015;Lumiste et al 2021;Vinn et al 2021).…”

mentioning

confidence: 99%

Early diagenetic transformation stages revealed by micro-analytical studies of shelly phosphorites, Rakvere region

Graul¹,

Kallaste²,

Moilanen³

et al. 2023

EJES

View full text Add to dashboard Cite

In sedimentary phosphorites, P 2 O 5 can occur in several forms, such as fossilised bones, nodules, or other biochemogenic phosphates (Godet and Föllmi 2021). The precipitation of biochemogenic phosphates in marine sediments is restricted to the transition zone between oxic and suboxic environments close to the sediment-water interface. The most common phosphate encountered belongs to the apatite mineral group, with cryptocrystalline carbonate fluorapatite (CAF-apatite), also referred to as 'francolite', dominating in the occurrence of cryptocrystalline grains (Lécuyer et al. 1998;Ptáček 2016). Francolites are non-stoichiometric minerals with the generalised formula (Ca 10-a-b Na a Mg b (PO 4 ) 6-x(CO 3 ) x-y-z (CO 3 ,F) y (SO 4 ) z F 2 ) and numerous structural and chemical variations. Chemical substitutions can occur in all its lattice sites (the two Ca 2+ sites, PO 4 3− and F − ) (McLennan 2001;Veiderma et al. 2005). Bioapatites, another sedimentary apatite source, originate from phosphate biomineralisation of the hard skeleton of vertebrates and some invertebrates. For the precipitation of vertebrate bones and teeth, the nucleation by proteins and macromolecular matrices provides casts that control crystal growth. Such processes presumably also control the segregation of the skeleton of invertebrates (Trappe 1998). In inarticulate brachiopods, direct biomineralisation occurs as precipitation of phosphate to stabilise the exoskeletons. Their shells are initially composed of hard tissues, amorphous hydrogels, phosphate precipitates, and organic matter (Lowenstam and Weiner 1989). Post-mortem, during the diagenesis, the biogenic phosphatic matter chemically evolves toward CAF-apatite composition through various substitutions, together with an increase in crystallite size and formation of authigenic apatite phases (Trappe 1998). However, such alteration pathways are still only fragmentally understood (Ferretti et al. 2021).The shelly phosphorites found in northern Estonia were deposited during the Cambrian-Ordovician transition in the coastal zone of a shallow, epicontinental sea (Heinsalu and Viira 1997;Nielsen and Schovsbo 2011). They belong to the Kallavere Formation, which spreads over most of northern Estonia and parts of the Leningrad region in northwestern Russia (Fig. 1; Kaljo et al. 1988). The Kallavere Formation in the study area has low thermal maturity. It exhibits no evidence of hydrothermal influence due to overall tectonic stability and shallow burial of the region (Kirsimäe

show abstract

Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms

Cited by 15 publications

References 93 publications

Post-phosphogenesis processes and the natural beneficiation of phosphates: Geochemical evidence from the Moroccan High Atlas phosphate-rich sediments

Post-phosphogenesis processes and the natural beneficiation of phosphates: Geochemical evidence from the Moroccan High Atlas phosphate-rich sediments

Geochemical Evidence of Ediacaran Phosphate Nodules in the Volyno-Podillya-Moldavia Basin, Ukraine

Early diagenetic transformation stages revealed by micro-analytical studies of shelly phosphorites, Rakvere region

Contact Info

Product

Resources

About