Uranium, Thorium and Rare Earth Element Deposits of Turkey

Akıska, Elif; Karakaş, Zehra; Öztürk, Ceyda

doi:10.1007/978-3-030-02950-0_14

Cited by 6 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [ 73 ], the inhibiting and activating effects of heavy isotopes, stable and radioactive (uranium-235 + 238, americium-241, and europium) were discussed, taking into consideration their electron acceptance ability and radioactivity. Thorium-232 and uranium-238, being the most abundant radioactive heavy elements in nature, are similar in radioactive decay energy (4.08 and 5.63 MeV, respectively), and comparable in specific radioactivity (4 and 12 kBq, respectively) [ 74 ], however, salts of thorium are of lower toxicity as compared with uranyl salts [ 75 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium

et al. 2021

View full text Add to dashboard Cite

Thorium is one of the most widespread radioactive elements in natural ecosystems, along with uranium, it is the most important source of nuclear energy. However, the effects of thorium on living organisms have not been thoroughly studied. Marine luminescent bacteria and their enzymes are optimal bioassays for studying low-dose thorium exposures. Luminescent bioassays provide a quantitative measure of toxicity and are characterized by high rates, sensitivity, and simplicity. It is known that the metabolic activity of bacteria is associated with the production of reactive oxygen species (ROS). We studied the effects of thorium-232 (10−11–10−3 M) on Photobacterium phosphoreum and bacterial enzymatic reactions; kinetics of bacterial bioluminescence and ROS content were investigated in both systems. Bioluminescence activation was revealed under low-dose exposures (<0.1 Gy) and discussed in terms of “radiation hormesis”. The activation was accompanied by an intensification of the oxidation of a low-molecular reducer, NADH, during the enzymatic processes. Negative correlations were found between the intensity of bioluminescence and the content of ROS in bacteria and enzyme systems; an active role of ROS in the low-dose activation by thorium was discussed. The results contribute to radioecological potential of bioluminescence techniques adapted to study low-intensity radioactive exposures.

show abstract

Section: Resultsmentioning

confidence: 99%

Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The important uranium mineralization is generally sedimentary type in Turkey (Akıska et al, 2019), only Demirtepe (Söke-Aydın) as vein-type mineralization (TÜSİAD, 1998). In Demirtepe, uranium enrichment is observed in fault zones developing in Paleozoic aged schists (Akıska et al, 2019). Thorium deposits, located in Kızılcaören-Eskişehir (Turkey), formed in barite, fluorite and REE deposit (Kaplan, 1977).…”

Section: Discussionmentioning

confidence: 99%

Microthermometric characteristics of vein type U-Th enrichment observed in the Fault Zones in Northwest of Arıklı (Çanakkale-Turkey)

Yalçın¹,

Öztürk²,

Kumral³

2021

Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

U-Th enrichments are observed in many regions in Western Anatolia. There are also U and Th enrichments in the fault zones developed in the tuffs in Arıklı in Biga Peninsula. The characterization of the mineralization is vein type and epigenetic formation. Çetmi Ophiolitic Melange forms the basis of the region. Küçükkuyu formation, which consists of Arıklı tuff member and shale-sandstone member, is located on this unit. The youngest unit in the region is diabase dykes. The study area was affected by deformations during the Paleogene period and E-W and NE-SW extended dip slip fault systems were developed. In the fault zone around Örencik Tepe, 64-1640 ppm values for U and 302-11813 ppm values for Th were obtained respectively. At the same time, hydrothermal magnesite breccias developed in this fault zone. Because of microthermometric assessments in these breccias associated with mineralization, it was determined that the homogenization temperatures (Th, o C) were between 282-348 o C and the % NaCl salinity equivalents were between 4.2-8.0 respectively. It was identified that the solution system of the liquid inclusions is as H2O-MgCl2-CaCl2 and the density of the liquids is between 0.58-0.74 g/cm 3 .

show abstract

“…Some ores (apatite, euxenite, gadolinite, xenotime, allanite, fluorite, barite, bastnasite, perovskite, sphene, and zircon etc.) can be classified as a valuable source of REEs (Kul et al, 2008;Karadağ et al, 2009;Akıska et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…World reserves of REEs are132 million tonnes (Balaram 2019), but REEs reserves potentially in Turkey are approximately 50 million tonnes (Öztürk et al, 2019). The Çanaklı, Kızılcaören, Karacaören, Kuluncak, Divriği, Keban, Kemiklitepe, Kızıldağ, Seydişehir, Şarkikaraağaç, Aksu, Doğankuzu and Sofular in Turkey, contain important potentially sources of REEs mineralisation (Deady et al, 2016;Yıldız et al, 2016;Kopar et al, 2018;Akıska et al, 2019;Öztürk et al, 2019). Moreover, Agostini et al (2019) investigated by some trace element contents, in particular the LILE and the REE of the youngest volcanic rocks in the region (Elazığ, Karakoçan, Tunceli, Mazgirt, Pertek).…”

Section: Introductionmentioning

confidence: 99%

REE'lerin Belirlenmesine Yönelik Çeşitli Analitik Teknikler Üzerine Bir Derleme

Özcan

2021

International Journal of Pure and Applied Sciences

View full text Add to dashboard Cite

Due to the transition from traditional energy sources to clean energy in recent years, it is stated that there will be a continuous increase in the need for REEs worldwide in the coming years owing to their especial physical and chemical properties. The principal sources of REEs are the minerals bastnazite, monazite, and xenotime, etc.. Rare earths have peculiar, unique properties and become essential in many high-tech applications. Therefore, the REEs is used for applications such as improvement of industrial. It is worth highlighting that the separation of rare earth can be both complex and challenging owing to similar properties which are shared to produce high quality and better quantity of REEs. In industrial production, complex ores containing rare earth elements are concentrated by physical ore beneficiation processes. For this, the processes proposed in this work possesses aguide on green chemistry, solvent extraction, membran filtration, adsorption of recovering REEs through stepwise extraction and enrichment technique. This review, attempts to provide notable information on the separation and purification efforts to date for the recovery of REEs.

show abstract

Uranium, Thorium and Rare Earth Element Deposits of Turkey

Cited by 6 publications

References 12 publications

Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium

Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium

Microthermometric characteristics of vein type U-Th enrichment observed in the Fault Zones in Northwest of Arıklı (Çanakkale-Turkey)

REE'lerin Belirlenmesine Yönelik Çeşitli Analitik Teknikler Üzerine Bir Derleme

Contact Info

Product

Resources

About