Luminescence centers in anhydrite, barite, celestite and their synthesized analogs

Gaft, M.; Bershov, L. V.; Krasnaya, A. R.; Yaskolko, V. Ya.

doi:10.1007/bf00307403

Cited by 27 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CaSO 4 :Tm, in particular, was found to be as good as CaSO 4 :Dy. RE-doped anhydrites were also studied by several other workers [7][8][9]. Radio-photoluminescence (RPL) in CaSO 4 :Eu 3+ and CaSO 4 :Sm 3+ phosphors was studied by Calvert and Danby [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of submicron range CaSO4:Eu particles

Patil¹,

Muthal

Dhopte

et al. 2007

Journal of Luminescence

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of submicron range CaSO4:Eu particles

Patil¹,

Muthal

Dhopte

et al. 2007

Journal of Luminescence

View full text Add to dashboard Cite

“…Hence, while the function of biomineralization in diplonemids remains unknown, we speculate that they may benefit from gravitropic sensing, which would allow directed movement and/or enable passive sedimentation. Another intriguing impact of barite and celestite is associated with their propensity to strong absorption of UV and blue light [67]. Hence, in surface waters, these minerals may contribute to UV protection.…”

Section: Discussionmentioning

confidence: 99%

Massive accumulation of strontium and barium in diplonemid protists

Pilátová

Tashyreva

Týč

et al. 2022

Preprint

View full text Add to dashboard Cite

Barium (Ba) and strontium (Sr) are often used as proxies for the reconstruction of past marine productivity and global climate. The ability to accumulate Ba2+ and Sr2+ in the form of crystals is rare among eukaryotes. Here we report that unicellular heterotrophs called diplonemids (Euglenozoa), one of the most abundant groups of marine planktonic protists, accumulate conspicuous amounts of these trace elements in the form of intracellular barite (BaSO4) and celestite (SrSO4) crystals, in concentrations greater than in other known Ba/Sr-accumulating organisms. Moreover, these flagellates can uptake Sr2+ exclusively or together with Ba2+ and form (Ba,Sr)SO4. One species, Namystinia karyoxenos, is naturally capable of intracellular accumulation of Ba2+ and Sr2+ 42,000 and 10,000 times relative to the surrounding medium. Altering the amounts of both elements in the medium resulted in corresponding changes in the quantity and composition of crystals. Planktonic copepods fed with diplonemids produce celestite-rich fecal pellets, which facilitate deposition of these minerals on the seafloor. We propose that diplonemids, which emerged during the Neoproterozoic era, qualify as impactful players of Ba2+/Sr2+ cycling in the ocean that possibly contributed to sedimentary rock formation over long geological periods.

show abstract

“…The peak at ~2.25eV (550nm) is most likely associated with Mn 2+ originally attributed by Tarashchan [4] and subsequently confirmed by Gaft et al [5]. The peak observed at ~ 3.02eV (410nm) in the LN CL spectra may be attributed to Ca replacement in the barite structure [5]. Attempts to correlate peak intensities to the measured trace element (Sr and Ce) abundances is currently unsuccessful [6].…”

mentioning

confidence: 87%

“…The peak in barite at room temperature ~3.9eV (318nm) may also be attributed to either an intrinsic (SO 4 ) 2or the presence of Ti 3+ [4]. The peak at ~2.25eV (550nm) is most likely associated with Mn 2+ originally attributed by Tarashchan [4] and subsequently confirmed by Gaft et al [5]. The peak observed at ~ 3.02eV (410nm) in the LN CL spectra may be attributed to Ca replacement in the barite structure [5].…”

mentioning

confidence: 93%

Cathodoluminescence Response of Barite at Room and Liquid Nitrogen Temperatures

Lowers

MacRae

Wilson

et al. 2022

Microscopy and Microanalysis

View full text Add to dashboard Cite

Rare earth element (REE) abundances in the Elk Creek carbonatite, Nebraska USA, is comparable to ore grade enrichment in carbonatite-hosted REE deposits [1]. Petrographic examination of textures documents a complex history of crystallization, brecciation, recrystallization, oxidation, and near surface alteration. Barite (BaSO 4 ) is present in most units, including REE-enriched zones, such that it may provide important constraints on processes that lead to ore-grade enrichment of carbonatites. Baritecontaining samples from different temperature regimes within the deposit were chosen to determine if the cathodoluminescence (CL) response at room and liquid nitrogen (LN) temperatures provide clues as to the processes by which REEs were enriched within the deposit and possible contributions of REE to the CL response.

show abstract

Luminescence centers in anhydrite, barite, celestite and their synthesized analogs

Cited by 27 publications

References 7 publications

Synthesis and properties of submicron range CaSO4:Eu particles

Synthesis and properties of submicron range CaSO4:Eu particles

Massive accumulation of strontium and barium in diplonemid protists

Cathodoluminescence Response of Barite at Room and Liquid Nitrogen Temperatures

Contact Info

Product

Resources

About