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Articoli di riviste sul tema "REE geochemistry"

Autore: Grafiati

Pubblicato: 10 dicembre 2022

Ultima modifica: 31 luglio 2025

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1

Cruz, Armanda, Pedro A. Dinis, Alberto Gomes, and Paula Leite. "Influence of Sediment Cycling on the Rare-Earth Element Geochemistry of Fluvial Deposits (Caculuvar–Mucope, Cunene River Basin, Angola)." Geosciences 11, no. 9 (2021): 384. http://dx.doi.org/10.3390/geosciences11090384.

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The rare-earth element (REE) geochemistry of sedimentary deposits has been used in provenance investigations despite the transformation that this group of elements may suffer during a depositional cycle. In the present investigation, we used the geochemistry and XRD mineralogy of a set of sand and mud fluvial deposits to evaluate the ability of REE parameters in provenance tracing, and the changes in REE geochemistry associated with weathering and sorting. The analyzed deposits were generated in a subtropical drainage basin where mafic and felsic units are evenly represented, and these crystal

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2

Turki, Farah, and Salih Awadh. "Discrimination Reef and Non-Reef Environments, Using REE Geochemistry." Iraqi Geological Journal 56, no. 1A (2023): 1–11. http://dx.doi.org/10.46717/igj.56.1a.1ms-2023-1-13.

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This research aims to distinguish the reef environment from the non-reef environment. The Oligocene-Miocene-succussion in western Iraq was selected as a case study, represented by the reefal limestone facies of the Anah Formation (Late Oligocene) deposited in reef-back reef environments, dolomitic limestone of the Euphrates Formation (Early Miocene) deposited in open sea environments, and gypsiferous marly limestone of the Fatha Formation (Middle Miocene) deposited in a lagoonal environment. The content of the rare earth elements (REEs) (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Ho, Tm, Yb, Lu,

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3

Gammons, Christopher H., and Scott A. Wood. "The aqueous geochemistry of REE." Chemical Geology 166, no. 1-2 (2000): 103–24. http://dx.doi.org/10.1016/s0009-2541(99)00186-2.

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4

Kalender, Leyla, and Gamze Aytimur. "REE Geochemistry of Euphrates River, Turkey." Journal of Chemistry 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/1012021.

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The study area is located on the Euphrates River at 38°41°32.48′′N–38°14′24.10′′N latitude and 39°56′4.59′′E–39°8°13.41′′E longitude. The Euphrates is the longest river in Western Asia. The lithological units observed from the bottom to the top are Permo-Triassic Keban Metamorphites, Late Cretaceous Kömürhan Ophiolites, Upper Cretaceous Elazığ Magmatic Complex, Middle Eocene Maden Complex and Kırkgeçit Formation, Upper Pliocene and Lower Eocene Seske Formation and Upper Miocene, Pliocene Karabakır and Çaybağı Formations, Palu Formation, and Holocene Euphrates River sediments. The geochemical s

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5

Chang, Chang Shen, A. H. Yusoff, C. A. R. Mohamed, et al. "Geochemistry of Rare Earth Elements in Pahang River Sediment, Malaysia." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 331, no. 4 (2024): 42–50. http://dx.doi.org/10.31643/2024/6445.37.

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Rare earth elements (REE) are a set of 17 chemically similar metallic elements including 15 lanthanides, scandium and yttrium. The current status of REE as a global strategic commodity has encouraged the identification of REE ore deposits. This research is carried out to identify the mining feasibility of fluvial sediment REE and to understand the sediment's physical and chemical characteristics and effects on the geochemical behaviour of REE in the longest river of Peninsular Malaysia namely Pahang River. Surface sediment samples were collected along Pahang River (n=44) in approximately 10 km

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6

Green, T. H., and N. J. Pearson. "High-pressure, synthetic loveringite-davidite and its rare earth element geochemistry." Mineralogical Magazine 51, no. 359 (1987): 145–49. http://dx.doi.org/10.1180/minmag.1987.051.359.16.

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AbstractLoveringite-davidite members of the crichtonite group were synthesized at high pressure and temperature (7.5 kbar, 1000–1050 °C) from a melt of TiO2 and rare earth element (REE) enriched basaltic andesite composition. Four sets of partition coefficients for La, Srn, Ho, Lu and Sr (analogue for Eu2+) were obtained. These show that light and heavy REE are readily accommodated, but the intermediate REE are discriminated against in the loveringite—davidite structure. This confirms the previously proposed two sites (A and M) for REE substitution in the crichtonite group. Additional experime

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7

Wu, Chengyu, and Shunso Ishihara. "REE geochemistry of the Southern Thailand granites." Journal of Southeast Asian Earth Sciences 10, no. 1-2 (1994): 81–94. http://dx.doi.org/10.1016/0743-9547(94)90010-8.

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8

Suhua, Yu, and Wen Qizhong. "REE geochemistry of loess in Xinjiang, China." Chinese Journal of Geochemistry 11, no. 3 (1992): 277–87. http://dx.doi.org/10.1007/bf02842272.

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9

Bonev, Nikolay, Petyo Filipov, and Tanya Stoylkova. "Chemical composition of late Eocene–early Oligocene corals in reef buildups from the Thrace basin, Bulgaria–Greece: Paleoenvironmental implications." Geologica Balcanica 51, no. 1 (2022): 23–33. http://dx.doi.org/10.52321/geolbalc.51.1.23.

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Coral whole-rock geochemistry and in situ LA-ICP-MS analyses of coral skeletons were performed on late Eocene–early Oligocene coral reef buildups from the Eastern Rhodope–Thrace region of Bulgaria and Greece. Coral reefs are locally associated with voluminous Oligocene volcanism in the region. The reefs are subdivided into (i) eruption-associated reefs (Krumovgrad); (ii) pre-eruption reefs (Ivaylovgrad); and (iii) Metaxades-Didymotycho reefs from field relations, trace element and rare-earth element (REE) abundances. Coral assemblages are dominated by Cladocora sp., which is accompanied by Por

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10

Bowerman, Melissa, Amy Christianson, Robert A. Creaser, and Robert W. Luth. "A petrological and geochemical study of the volcanic rocks of the Crowsnest Formation, southwestern Alberta, and of the Howell Creek suite, British Columbia." Canadian Journal of Earth Sciences 43, no. 11 (2006): 1621–37. http://dx.doi.org/10.1139/e06-037.

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Alkaline igneous rocks of the Crowsnest Formation in southwestern Alberta and in the Howell Creek area in southeastern British Columbia have been suggested previously to be cogenetic. To test this hypothesis, samples of both suites were characterized petrographically and their major and trace element geochemistry was determined. A subset of the samples was analyzed for whole-rock Sr and Nd isotope geochemistry. The samples of the two suites are latites, trachytes, and phonolites based on the International Union of Geological Sciences (IUGS) total alkalis versus silica (TAS) diagram. Samples fr

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11

Salih, Makki Omer, Bo Wan, and David R. Lentz. "Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan." Neues Jahrbuch für Mineralogie - Abhandlungen 197, no. 2 (2021): 185–208. http://dx.doi.org/10.1127/njma/2021/0274.

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12

Graupner, T., F. Melcher, H. E. Gäbler, M. Sitnikova, H. Brätz, and A. Bahr. "Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data." Mineralogical Magazine 74, no. 4 (2010): 691–713. http://dx.doi.org/10.1180/minmag.2010.074.4.691.

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AbstractNew data on rare earth element (REE) concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide are presented. The REE geochemistry was studied by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Five major types of chondrite-normalized REE distribution patterns are defined for columbite-group minerals (CGM) from lithium-caesium-tantalum (LCT) pegmatites and rare-metal granites. Features to discriminate between the types include (1) the shape of the pattern (e.g. flat or concave), (2) calculated ratios between groups

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13

Nugraha, A. A. S., Syafrizal, and A. N. H. Hede. "Features of Reflectance Spectroscopy and Geochemistry Towards REE Mineralization in Weathered Granitic Clays." IOP Conference Series: Earth and Environmental Science 1437, no. 1 (2024): 012006. https://doi.org/10.1088/1755-1315/1437/1/012006.

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Abstract The rising global demand for rare earth elements (REEs) has intensified exploration efforts, particularly in regions like Indonesia with significant REE potential. This study explores the use of reflectance spectroscopy for rapid identification of REE-bearing clay minerals derived from weathered granite in West Kalimantan. Clay samples from distinct weathering horizons were analyzed using X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and reflectance spectroscopy. XRD confirmed the presence of kaolinite, dickite, gibbsite, and quartz, indicating their

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14

Shchukina, Elena V., Alexey M. Agashev, and Vladimir S. Shchukin. "Diamond-Bearing Root Beneath the Northern East European Platform (Arkhangelsk Region, Russia): Evidence from Cr-Pyrope Trace-Element Geochemistry." Minerals 9, no. 5 (2019): 261. http://dx.doi.org/10.3390/min9050261.

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In this study, we reconstruct the composition and metasomatic evolution of the lithospheric mantle beneath the poorly-studied southern Arkhangelsk region, based on the geochemistry of 145 Cr-pyrope grains recovered from samples of modern rivers and stream sediments, to evaluate the diamond exploration potential of these territories. Based on the concentrations of Cr2O3, CaO, TiO2, and rare earth elements (REEs), the garnets are divided into four groups: (1) low-chromium lherzolitic pyropes with fractionated heavy REE patterns; (2) low- to medium-chromium pyropes of lherzolitic and megacryst as

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15

Álvarez-Vázquez, Miguel Ángel, Elena De Uña-Álvarez, and Ricardo Prego. "Patterns and Abundance of Rare Earth Elements in Sediments of a Bedrock River (Miño River, NW Iberian Peninsula)." Geosciences 12, no. 3 (2022): 105. http://dx.doi.org/10.3390/geosciences12030105.

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Bedrock rivers, whose sedimentary geochemistry has been scarcely investigated, are suitable to test geochemical approaches in order to assess the existence and extent of human alterations in the natural abundance of rare earth elements. This work presents the study of REE contents in fine-grained sediments of the (bedrock) Miño River, in an urban reach of its middle course. Different statistical procedures were employed in order to decipher the abundances and patterns of distribution of REE in different environments, showing a higher REE accumulation in surface sediments trapped by potholes an

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16

Bonev, Nikolay, Petyo Filipov, and Tanya Stoylkova. "Chemical composition of late Eocene–early Oligocene corals in reef buildups from the Thrace basin, Bulgaria–Greece: Paleoenvironmental implications." Geologica Balcanica, no. 1 (April 12, 2022): 23–33. https://doi.org/10.52321/GeolBalc.51.1.23.

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Abstract (sommario):

Coral whole-rock geochemistry and in situ LA-ICP-MS analyses of coral skeletons were performed on late Eocene–early Oligocene coral reef buildups from the Eastern Rhodope–Thrace region of Bulgaria and Greece. Coral reefs are locally associated with voluminous Oligocene volcanism in the region. The reefs are subdivided into (i) eruption-associated reefs (Krumovgrad); (ii) pre-eruption reefs (Ivaylovgrad); and (iii) Metaxades-Didymotycho reefs from field relations, trace element and rare-earth element (REE) abundances. Coral assemblages are dominated by 

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17

Sadeghi, Martiya, Nikolaos Arvanitidis, and Anna Ladenberger. "Geochemistry of Rare Earth Elements in Bedrock and Till, Applied in the Context of Mineral Potential in Sweden." Minerals 10, no. 4 (2020): 365. http://dx.doi.org/10.3390/min10040365.

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The Rare Earth Element (REE) mineralizations are not so “rare” in Sweden. They normally occur associated and hosted within granitic crystalline bedrock, and in mineral deposits together with other base and trace metals. Major REE-bearing mineral deposit types are the apatite-iron oxide mineralizations in Norrbotten (e.g., Kiruna) and Bergslagen (e.g., Grängesberg) ore regions, the various skarn deposits in Bergslagen (e.g., Riddarhyttan-Norberg belt), hydrothermal deposits (e.g., Olserum, Bastnäs) and alkaline-carbonatite intrusions such as the Norra Kärr complex and Alnö. In this study, analy

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18

Dub, S., and G. Mizens. "Geochemistry of rare earth elements and cerium anomaly in sedimentary marine carbonates: modern concepts." Vestnik of geosciences, no. 11 (December 27, 2023): 3–17. http://dx.doi.org/10.19110/geov.2023.11.1.

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The article review the geochemistry of rare earth elements (REE) in sedimentary marine carbonates (limestones and dolostones) with respect to using the cerium anomaly as a proxy for redox conditions in ancient seawater. The physicochemical properties of REE and Y, the problem of normalizing their contents in sediments, behavior in the World Ocean and in chemogenic deposits, the origin of La, Ce, Eu, Gd anomalies and their calculations, sample preparation techniques, contamination problem and the influence of non-carbonate REE+Y-hosting phases to whole rock and acidic leachate compositions, as

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19

Chen, Wei, Huang Honghui, Tian Bai, and Shaoyong Jiang. "Geochemistry of Monazite within Carbonatite Related REE Deposits." Resources 6, no. 4 (2017): 51. http://dx.doi.org/10.3390/resources6040051.

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20

Shuyi, Liang, and Xia Hongyuan. "Tungsten mineralization and mica REE geochemistry, Huangsha, Jiangxi." Chinese Journal of Geochemistry 10, no. 4 (1991): 326–34. http://dx.doi.org/10.1007/bf02841093.

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21

Barbey, P., J. Bernard-Griffiths, and J. Convert. "The Lapland charnockitic complex: REE geochemistry and petrogenesis." Lithos 19, no. 2 (1986): 95–111. http://dx.doi.org/10.1016/0024-4937(86)90002-2.

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22

Chelnokov, George, Natalia Kharitonova, Vasilii Lavrushin, Ivan Bragin, and Altyn Aidarkozhina. "Geochemistry of lanthanides in thermal waters of Issyk-Kul Lake Basin." E3S Web of Conferences 486 (2024): 05016. http://dx.doi.org/10.1051/e3sconf/202448605016.

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The distribution and abundance of lanthanides in thermal waters of the northern Tien Shan (Issyk-Kul lake basin) were studied. Waters are represented by three types: Na-Cl-SO4-HCO3, Na-Ca-Cl-SO4 and Na-Ca-Cl, demonstrates alkaline pH (7.3–9.7) and Eh from -260 to +98 mV. Discharge temperature varies from 15 to 50oC, and total dissolved solids from 0.2 to 13.0 g/l. It is established that lanthanides (or rare earth elements, REE) concentrations vary from 0.07 to 0.81 ppb, the maximal concentrations relate to a Na-Ca-Cl water type, which demonstrates the influence of reverse ion exchange. The tot

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23

Casey, Patrick, George Morris, and Martiya Sadeghi. "Derivation of Predictive Layers Using Regional Till Geochemistry Data for Mineral Potential Mapping of the REE Line of Bergslagen, Central Sweden." Minerals 14, no. 8 (2024): 753. http://dx.doi.org/10.3390/min14080753.

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With the increasing need for rare-earth elements (REEs) to reach the goals of the ongoing green energy transition, new and innovative methods are needed to identify new primary resources of these critical metals. This study explores the potential to use a non-biased, uniform till dataset to generate evidentiary layers that describe these critical factors and geochemical anomalies to aid mineral potential mapping (MPM) for REEs using machine-assisted methods. The till samples used in this study were collected from the “REE Line”, a sub-region within the Bergslagen lithotectonic province, Sweden

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Kilic, Ayşe Didem, Nevin Konakci, and Ahmet Sasmaz. "Garnet Geochemistry of Pertek Skarns (Tunceli, Turkey) and U-Pb Age Findings." Minerals 14, no. 6 (2024): 539. http://dx.doi.org/10.3390/min14060539.

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The Fe skarn and vein-type Cu mineralization types are common in the Eastern Taurus Mountains. This study aims to determine the U-Pb geochronology of garnets of varying sizes within the skarn zone developed at the quartz diorite–marble contact zone in Ayazpınar, Pertek District, Tunceli Province, Turkey. Additionally, this study aims to determine the age of the skarnization and the types of inclusion minerals in the garnets. Faulting and magma emplacement along the thrust plane caused mineralization in the Eastern Taurus Mountains, especially at the marble and quartz diorite contact zone betwe

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25

Reinhardt, Nils, Joaquín Proenza, Cristina Villanova-de-Benavent, et al. "Geochemistry and Mineralogy of Rare Earth Elements (REE) in Bauxitic Ores of the Catalan Coastal Range, NE Spain." Minerals 8, no. 12 (2018): 562. http://dx.doi.org/10.3390/min8120562.

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Karst bauxite deposits are currently investigated as a new resource for rare earth elements (REE) in order to avoid present and future supply shortfalls of these critical metals. The present work focuses on the geochemistry and mineralogy of the REE in karst bauxite deposits of the Catalan Coastal Range (CCR), NE-Spain. It is revealed that the studied bauxitic ores have a dominant breccia and local ooido-pisoidic and pelitomorphic texture. The bauxitic ores are mostly composed of kaolinite and hematite, as well as of lesser amounts of boehmite, diaspore, rutile and calcite. The mineralogy and

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Prudêncio, Maria Isabel, Francisco Ruiz, Rosa Marques, et al. "REE Geochemistry of Neogene–Holocene Sediments of La Fontanilla Cove (Tinto Estuary, SW Spain)." Minerals 12, no. 4 (2022): 417. http://dx.doi.org/10.3390/min12040417.

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The Tinto and Odiel rivers (SW Spain) drain from a vast sulfide mining district and join at a 20-km-long estuary that enters the Atlantic Ocean. In this work, the contents of rare earth elements (REE) and fractionation in Neogene–Holocene sediment cores from La Fontanilla cove (Tinto estuary) were studied. The sediments were collected from a depth of 18 m at different distances from the recent river flow and were analyzed for new information on the temporal development of the REE load in the sediment column. Results show that the ∑ REE is higher in the finer sediments and during periods of min

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27

Wei, Zhang, and Nian Qiao Fang. "The Geochemistry Research on Eocene Volcanic Rocks in Sanshui Basin." Applied Mechanics and Materials 275-277 (January 2013): 322–25. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.322.

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Guangdong Sanshui Basin evoluted with extreme volcanic activities. Eruptions between Paleocene to Eocene were concentrated on Xinzhuang, Buxin, Baoyue and Huayong formations. For realized the relationship between various kind of rocks, Geochemistry analysis such as multi-element and rare-earth element determination were launched on Basalt, Trachyte and Rhyolite samples from the research area. Geochemistry diagram suggest that: REE distribution of Basalt followed as mid-plate alkali Basalt mode, while their trace element spider diagrams act as continental alkali Basalt with Nb, Ti rich and Sr l

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Basir, S. R., and S. Balakrishnan. "Geochemistry of Sphene from Granodiorites Surrounding the Hutti-Maski Schist Belt: Significance to Rare Earth Element (REE) Modeling." Journal Geological Society of India 54, no. 2 (1999): 107–19. http://dx.doi.org/10.17491/jgsi/1999/540201.

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Abstract A study of the distribution of REE in sphene from three granodiorite samples around NNW-SSE trending Hutti-Maski schist belt has been described here. Two distinct sets of sphene-melt Kd, values for REE have been observed among the three sphene-whole rock pairs studied. The chondrite normalized REE pattern of sphene from east (Gajalagatta) and northeast (Uti) granodiorites show LREE enriched and HREE depleted patterns with slight or no negative Eu anomaly. These REE patterns are parallel to the respective whole rock samples. But the chondrite normalized REE pattern of sphene from the s

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29

Yaomin, Yang, Tu Guangzhi, and Hu Ruizhong. "REE and trace element geochemistry of Yinachang Fe-Cu-REE deposit, Yunnan Province, China." Chinese Journal of Geochemistry 23, no. 3 (2004): 265–74. http://dx.doi.org/10.1007/bf02842074.

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Barrett, T. J., P. W. Fralick, and I. Jarvis. "Rare-earth-element geochemistry of some Archean iron formations north of Lake Superior, Ontario." Canadian Journal of Earth Sciences 25, no. 4 (1988): 570–80. http://dx.doi.org/10.1139/e88-055.

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Rare-earth-element (REE) compositions of iron formation from two Archean terrains in western Ontario have been determined in order to assess the possible influence of hydrothermal activity on the REE patterns of chemical sediments. One terrain is characterized by sulfide-facies iron formation in association with volcanic flows and volcaniclastic sediments, whereas the other is dominated by oxide-facies iron formation intercalated within submarine-fan clastic sediments. Mineral separates of chert, magnetite, and pyrite from the iron formations have low ΣREE concentrations (< 20–30 ppm) and d

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Kozlov, Evgeniy, Ekaterina Fomina, Mikhail Sidorov, et al. "The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry." Minerals 10, no. 1 (2020): 73. http://dx.doi.org/10.3390/min10010073.

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The Vuoriyarvi Devonian carbonatite–ijolite–pyroxenite–olivinite complex comprises several carbonatite fields: Neske Vara, Tukhta-Vara, and Petyayan-Vara. The most common carbonatites in the Tukhta-Vara and Neske-Vara fields are calciocarbonatites, which host several P, Fe, Nb, and Ta deposits. This paper focuses on the Petyayan-Vara field, in which the primary magmatic carbonatites are magnesian. The least altered magnesiocarbonatites are composed of dolomite with burbankite and are rich in REE (up to 2.0 wt. %), Sr (up to 1.2 wt. %), and Ba (up to 0.8 wt. %). These carbonatites underwent sev

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Bilić, Šime, Irena Peytcheva, Stoyan Georgiev, et al. "Petrography and geochemistry of Cretaceous bauxites from Jajce, Bosnia and Herzegovina." Review of the Bulgarian Geological Society 84, no. 3 (2023): 77–80. http://dx.doi.org/10.52215/rev.bgs.2023.84.3.77.

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The study presents petrographic and compositional data of Late Cretaceous bauxite deposits in the area of Jajce, Bosnia and Herzegovina. Results indicate that bauxites exhibit ooidic to pisodic textures enclosed within a pelitomorfic matrix. Most of the deposits are boehmitic but in some localities, a considerable quantity of diaspore is identified. Hematite is the dominant Fe-mineral, while kaolinite, goethite and calcite are minor. The accessory minerals are represented by anatase, rutile and zircon. Al2O3 content ranges between 54.32–61.05 wt % and is negatively correlated to Fe2O3. Rare ea

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Hariharan, G. N., and C. G. Nambiar. "Rare Earth Element Geochemistry of Modern Detrital Sediments from Chaliyar River, Northern Kerala." Journal Geological Society of India 52, no. 2 (1998): 213–17. http://dx.doi.org/10.17491/jgsi/1998/520209.

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Abstract ?REE in the detrital sediments from Chaliyar river channel ranges from 37.7 to 65.5 ppm, which is around 0.3 times that of the average crust and NASC, and is lower compared to that of their provenance rocks. The highly fractionated chondrite-normalized REE pattern of the average sediment mimics that of the average provenance rock. but for the presence of a negative europium anomaly that is suggestive of preferential removal of plagioclase during weathering. The similarity in the REE contents of samples from different locations in the main channel reflects the immobility of rare earths

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Chirkova, Evgenia, Ekaterina Baranovskaya, Natalia Kharitonova, Vasily Lavrushin, Georgy Chelnokov, and Ivan Bragin. "Geochemistry of the rare earth elements in the sparkling groundwaters of the Caucasus ridge, Russia." E3S Web of Conferences 98 (2019): 01009. http://dx.doi.org/10.1051/e3sconf/20199801009.

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The paper presents data on the content and distribution of rare earth elements (REE) in the high pCO2 mineral waters of the Caucasus mountain-folded region. It is shown that the concentrations of REEtotal are rather high in the studied waters. However, they vary in a very wide range (from 0.46 to 50.37 µg/L). A characteristic feature of these waters is the predominance of light REE in comparison with heavy REE in them. The distinct correlation of REEtotal in the solution from the concentration of iron and aluminum in it indicates that the absolute contents of REE in the mineral waters of the r

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35

Xuexin, Song, Xu Qingsheng, Guo Yuemin, Mao Xueying, and Ouyang Hong. "REE Geochemistry of VMS and SEDEX Ores in China." Acta Geologica Sinica - English Edition 71, no. 3 (2010): 263–72. http://dx.doi.org/10.1111/j.1755-6724.1997.tb00367.x.

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36

CHEN, Zhihua. "REE geochemistry of surface sediments in the Chukchi Sea." Science in China Series D 46, no. 6 (2003): 603. http://dx.doi.org/10.1360/03yd9053.

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37

Zhihua, Chen, Gao Aiguo, Liu Yanguang, Sun Haiqing, Shi Xuefa, and Yang Zuosheng. "REE geochemistry of surface sediments in the Chukchi Sea." Science in China Series D: Earth Sciences 46, no. 6 (2003): 603–11. http://dx.doi.org/10.1007/bf02984538.

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38

Zhu, Zhaozhou, Congqiang Liu, Zhongliang Wang, Bo Gao, Zhihua Zhou, and Jun Li. "REE geochemistry of Chaohu and Longgan lakes, eastern China." Chinese Journal of Geochemistry 25, S1 (2006): 150. http://dx.doi.org/10.1007/bf02840031.

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39

SuZhen, Wu. "REE geochemistry of precambrian metamorphic rocks in Wutaishan region." Chinese Journal of Geochemistry 8, no. 1 (1989): 72–83. http://dx.doi.org/10.1007/bf02842216.

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40

Souissi, Fouad, Radhia Sassi, Jean-Louis Dandurand, Salah Bouhlel, and Sami Ben Hamda. "Fluid inclusion microthermometry and rare earth element distribution in the celestites of the Jebel Doghra ore deposit (Dome Zone, northern Tunisia): towards a new genetic model." Bulletin de la Société Géologique de France 178, no. 6 (2007): 459–71. http://dx.doi.org/10.2113/gssgfbull.178.6.459.

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Abstract (sommario):

Abstract The celestite ore of Jebel Doghra occurs as stratabound deposits within the cap-rock of a diapiric structure of Triassic salt-rocks. The celestite deposits result mainly from the late diagenetic to epigenetic replacement of the carbonated host-rocks giving rise to a dolomite-celestite “banded ore”. Celestite is locally observed within fractures. This study proposes a new genetic model based on fluid inclusion (FI) microthermometry and REE geochemistry. FI show that celestite, occurring either as stratabound bodies or lodes, was deposited from a highly saline (20.7 ± 1.3 wt%NaCl equiva

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41

Mei, Wenhua, Chunfang Cai, Xinyu Ming, Zichen Wang, and Lei Jiang. "Geochemistry and Enrichment of Rare Earth Elements in Phosphorite Successions in the Lower Cambrian, Eastern Yun’nan, South China." Minerals 15, no. 6 (2025): 581. https://doi.org/10.3390/min15060581.

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Abstract (sommario):

The South China Block hosts extensive sedimentary phosphorites that offer valuable insights into both paleoenvironmental reconstruction and rare earth element (REE) resource potential. However, the mechanisms governing REE enrichment in these deposits remain poorly understood. This study investigates two distinct phosphorite layers from the Lower Cambrian Zhujiaqing (ZJQ) Formation in the Bailongtan (BLT) area of the Yangtze Platform using integrated analyses including petrology, XRD, major and trace elements, δ¹³C and δ¹⁸O isotopes, and LA-ICP-MS. The lower thin-bedded phosphorite, composed o

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42

Rae, David A., Ian M. Coulson, and Andrew D. Chambers. "Metasomatism in the North Qôroq centre, South Greenland: apatite chemistry and rare-earth element transport." Mineralogical Magazine 60, no. 398 (1996): 207–20. http://dx.doi.org/10.1180/minmag.1996.060.398.14.

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Abstract (sommario):

AbstractThe North Qôroq syenite centre forms part of the Gardar Province of South Greenland. Extensive metasomatism, associated with the evolution of syenitic magmas, has resulted in redistribution of the rare-earth elements (REE), originally concentrated by magmatic processes, in both the syenites and surrounding granite-gneiss and quartzite country rocks. An important host for REE is apatite which can occur in significant quantities. Metasomatic apatites show complex, concentric, but irregular patterns of zonation, clearly seen using CL and BSE imaging. This zonation is related to successive

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43

Manikyamba, C. "Petrology and Geochemistry of Mixed Oxide-Silicate Facies Banded Iron Formations from Sandur Schist Belt, India." Journal Geological Society of India 52, no. 6 (1998): 651–61. http://dx.doi.org/10.17491/jgsi/1998/520604.

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Abstract (sommario):

Abstract Mixed oxide-silicate facies banded iron formations are found as thin bands in the Eastern Volcanic Block of the Sandur schist belt They consist of haematite, magnetite, cummingtonite-grunerite and chert/quartz. Chemical constituents are SiO2, Fe2O3 and FeO with no appreciable concentration of any other oxide. This composition is reflected in their trace and REE data, such as high order depletion in geochemical twins like Zr-Hf, V-Sc and Nb-Ta. The REE patterns are highly depleted (SREE 0.96 to 9.98 ppm) with Nd/Yb varying between 2 and 5. Cherty BIFs from this belt, metamorphosed to l

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44

Wang, Xiaomei, Fan Deng, Haijian Cheng, et al. "Effects of Heating on the Binding of Rare Earth Elements to Humic Acids." Energies 15, no. 19 (2022): 7362. http://dx.doi.org/10.3390/en15197362.

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Abstract (sommario):

In deep underground environments, temperature is one of the key factors affecting the geochemistry behaviors of rare earth elements (REE) in organic-rich fluid. However, the influence of temperature on the interaction between humic acids (HA) and REE is not well known. In the present study, the influence of temperature on the HA–REE-binding behavior was evaluated based on heating experiments of REE-doped HA solution. Lignite-extracted HA and REE-binding experiments were conducted over a temperature range of 20 to 200 °C to quantify HA–REE complexation and the influence of temperature on HA bin

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45

Hussain, S. M., and V. Divakara Rao. "Geochemistry of Polyphase Gneisses from Schirmacher Oasis, East Antarctica." Journal Geological Society of India 47, no. 3 (1996): 303–12. http://dx.doi.org/10.17491/jgsi/1996/470304.

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Abstract (sommario):

Abstract Gamet-biotite gneisses (GBG), augen gneisses (AG) and quartzo-feldspathic gneisses (QFG) constitute the main litho-units in the granulite terrain of Schirmacher Oasis, East Antarctica. The GBG and AG show chemical and mineralogical similarities. The QFG differs from GBG and AG both in major and trace elements. Overall composition of these different polyphase gneisses indicate increase in silica and alkalies from GBG to QFG and decrease in CaO, FeO and MgO. In trace elements Rb increases from GBG to QFG, while Sr and Ba increase in AG and decrease in QFG. The REE distribution patterns

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46

Amangeldykyzy, A., A. N. Kopobayeva, N. S. Askarova, D. S. Ozhigin, and V. S. Portnov. "Study of rare earth elements in the coals of the Shubarkol deposit." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 4, no. 319 (2021): 48–56. http://dx.doi.org/10.31643/2021/6445.40.

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Abstract (sommario):

The work studies mineralogical and geochemical features of the Jurassic coals of the Shubarkol deposit. The samples were examined using the method of scanning electron microscopy (SEM-EDX) Hitachi S-3400N, which was carried out at the Uranium Geology Research and Development Center at the Department of Geoecology and Geochemistry of TPU. Coal geochemistry was studied by instrumental neutron activation analysis (INAA) at the nuclear geochemical laboratory of the Department of Geoecology and Geochemistry of National Research Tomsk Polytechnic University (TPU). The choice of this object of study

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47

Kutty, T. R. N., S. R. N. Murthy, and G. V. Anantha Iyer. "REE Geochemistry and Petrogenesis of Ultramafic Rocks of Chalk Hills, Salem." Journal Geological Society of India 28, no. 6 (1986): 449–66. http://dx.doi.org/10.17491/jgsi/1986/280603.

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Abstract (sommario):

Abstract REE geochemistry of plagioclase-free, plagioclase-bearing and titanoclinohumite-bearing ultramafic suite of Chalk Hills is presented. The rare earth elements are determined by spark source mass-spectrography combined with a preanalytical chemical concentration reaching ± 4 accuracy and 0.01 ppm detection limit. Plagioclase-free ultramafics are 10 times LREE depleted. while HREE abundance is 1-2 times those of chondrite. Since the samples are not serpentinised, these REE patterns are considered to be primary and compare well with those of high temperature peridotites, particularly on C

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48

Ramesh, S., and S. Ramasamy. "Rare Earth Element Geochemistry of a Sediment Core from the Lower Bengal Fan." Journal Geological Society of India 50, no. 4 (1997): 399–406. http://dx.doi.org/10.17491/jgsi/1997/500403.

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Abstract (sommario):

Abstract The Post Archaean Australian Shale (PAAS) normalised Rare Earth Element (REE) distribution pattern of a 4m box core from the Lower Bengal Fan clearly exhibits different types of patterns according to the climatic fluctuations of Late Quaternary period. Based on the vertical profiles of REEs, SLight REE/SHeavy REE ratio, Ce^ and SREE the climatic boundaries were further confirmed. The influence of continental sediments with a rugher rate of sedimentation are reflected in higher concentration of SREE in glacial periods. The above observations suggest the Late Pleistocene - Holocene boun

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49

Slukovskii, Z. I., and A. V. Guzeva. "Trace elements in the sediment cores of lakes on King George Island, Antarctica." Doklady Rossijskoj akademii nauk. Nauki o Zemle 516, no. 1 (2024): 391–400. https://doi.org/10.31857/s2686739724050097.

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Abstract (sommario):

Primary studies of the concentrations of rare elements in the sediments of two lakes on King George Island (Kitezh and Glubokoe) showed that their geochemistry reflects the geological features of the area. Compared to the upper part of the Earth's crust, the studied sediments are enriched in Cu, Cd, V, Tl, Mn, Ti and P. Similar patterns have been identified in the geochemistry of volcanic and sedimentary rocks of the Fildes Peninsula. Trends in REE changes generally follow their behavior in rocks, but the overall REE concentration in sediments of lakes is higher, which may be due to the presen

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50

Simandl, George J., Suzanne Paradis, Johnathan Savard, et al. "Mineral control on the geochemistry of the Rock Canyon Creek REE-F-Ba deposit, British Columbia, Canada." Geochemistry: Exploration, Environment, Analysis 21, no. 2 (2021): geochem2020–010. http://dx.doi.org/10.1144/geochem2020-010.

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Abstract (sommario):

The Rock Canyon Creek carbonate-hosted REE-F-Ba deposit has tectonic, stratigraphic and structural similarities with Mississippi Valley-type and sparry magnesite deposits in the SE Rocky Mountains. The main REE-fluorite zone is a steeply dipping body, extending 1100 m along-strike, 50 m wide and 100 m deep. It spatially coincides with pre-existing crackle breccias in carbonate rocks, and consists of dolomite, fluorite, barite, pyrite, quartz, K-feldspar, calcite, porous apatite, REE-fluorocarbonates and REE-phosphates. The main fluorocarbonates are bastnaesite, parisite and synchysite. Monazit

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