Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece
The coastal area of the Kavala district, Northern Greece, is characterized by minerals enriched in rare earth elements (REE). The present study focuses on the mineralogy of the black sands from six different locations and the comprehensive mineral chemistry of the REE-bearing minerals, allanite-(Ce)...
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MDPI AG
2022-07-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/12/7/277 |
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| author | Eftychia Peristeridou Vasilios Melfos Lambrini Papadopoulou Nikolaos Kantiranis Panagiotis Voudouris |
| author_facet | Eftychia Peristeridou Vasilios Melfos Lambrini Papadopoulou Nikolaos Kantiranis Panagiotis Voudouris |
| author_sort | Eftychia Peristeridou |
| collection | DOAJ |
| description | The coastal area of the Kavala district, Northern Greece, is characterized by minerals enriched in rare earth elements (REE). The present study focuses on the mineralogy of the black sands from six different locations and the comprehensive mineral chemistry of the REE-bearing minerals, allanite-(Ce), epidote, monazite, thorite, zircon and titanite. Allanite-(Ce) is the most important carrier of light REE (LREE) in the studied black sands, reaching up to 23.24 wt % ΣREE. The crystal chemistry of allanite-(Ce) transitions into ferriallanite-(Ce), due to the significant involvement of Fe<sup>3+</sup>. High resolution backscattered electron (BSE) images were used to identify zoning that corresponds to variations in REE, Th and U. These modifications follow the exchange scheme: (Ca + (Fe<sup>3+</sup>, Al))<sub>−1</sub>(LREE, Y, Th, U + (Fe<sup>2+</sup>, Mg, Mn))<sub>+1</sub>. Epidotes may also contain up to 0.5 REE<sup>3+</sup> apfu. Monazite and thorite are found as inclusions in allanite-(Ce) and are enriched in Ce, La and Nd, together with Th and U. Some zircons are enriched in Hf, while some titanites host Nb and V. |
| first_indexed | 2024-03-09T11:50:57Z |
| format | Article |
| id | doaj.art-e73fd162937d43479e042772327c5abb |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T11:50:57Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-e73fd162937d43479e042772327c5abb2023-11-30T23:15:11ZengMDPI AGGeosciences2076-32632022-07-0112727710.3390/geosciences12070277Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern GreeceEftychia Peristeridou0Vasilios Melfos1Lambrini Papadopoulou2Nikolaos Kantiranis3Panagiotis Voudouris4Faculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceFaculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceFaculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceFaculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceFaculty of Geology & Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, GreeceThe coastal area of the Kavala district, Northern Greece, is characterized by minerals enriched in rare earth elements (REE). The present study focuses on the mineralogy of the black sands from six different locations and the comprehensive mineral chemistry of the REE-bearing minerals, allanite-(Ce), epidote, monazite, thorite, zircon and titanite. Allanite-(Ce) is the most important carrier of light REE (LREE) in the studied black sands, reaching up to 23.24 wt % ΣREE. The crystal chemistry of allanite-(Ce) transitions into ferriallanite-(Ce), due to the significant involvement of Fe<sup>3+</sup>. High resolution backscattered electron (BSE) images were used to identify zoning that corresponds to variations in REE, Th and U. These modifications follow the exchange scheme: (Ca + (Fe<sup>3+</sup>, Al))<sub>−1</sub>(LREE, Y, Th, U + (Fe<sup>2+</sup>, Mg, Mn))<sub>+1</sub>. Epidotes may also contain up to 0.5 REE<sup>3+</sup> apfu. Monazite and thorite are found as inclusions in allanite-(Ce) and are enriched in Ce, La and Nd, together with Th and U. Some zircons are enriched in Hf, while some titanites host Nb and V.https://www.mdpi.com/2076-3263/12/7/277rare earth elements (REE)black sandsKavalaallanite subgroupallanite-(Ce)epidote group |
| spellingShingle | Eftychia Peristeridou Vasilios Melfos Lambrini Papadopoulou Nikolaos Kantiranis Panagiotis Voudouris Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece Geosciences rare earth elements (REE) black sands Kavala allanite subgroup allanite-(Ce) epidote group |
| title | Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece |
| title_full | Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece |
| title_fullStr | Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece |
| title_full_unstemmed | Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece |
| title_short | Mineralogy and Mineral Chemistry of the REE-Rich Black Sands in Beaches of the Kavala District, Northern Greece |
| title_sort | mineralogy and mineral chemistry of the ree rich black sands in beaches of the kavala district northern greece |
| topic | rare earth elements (REE) black sands Kavala allanite subgroup allanite-(Ce) epidote group |
| url | https://www.mdpi.com/2076-3263/12/7/277 |
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