Article
Chemistry, Physical
Xiao Ge, Qingfeng Guo, Qianqian Wang, Tao Li, Libing Liao
Summary: This paper systematically analyzes the composition, structure, luminescent properties, and potential application value of three fluorites with different colors. The results show that REE and radioactive elements have effects on the structure, color, and luminescence of fluorite.
Article
Geology
S. Brandt, M. L. Fassbender, R. Klemd, C. Macauley, P. Felfer, K. M. Haase
Summary: The study reveals the presence of iron-rich olivine with extremely high heavy rare earth element (HREE) contents in the Vergenoeg deposit of the Bushveld large igneous province in South Africa, suggesting the potential for significant HREE enrichment in olivine. This discovery highlights fayalite cumulates as promising targets for future exploration of HREE deposits.
Article
Geochemistry & Geophysics
Anna A. Redina, Anna G. Doroshkevich, Ilya V. Veksler, Cora C. Wohlgemuth-Ueberwasser
Summary: This study focused on the fluorite mineralization associated with different types of magmatism in Western Transbaikalia, particularly in three significant examples in the region. The research revealed the conditions and genetic relationship of fluorite mineralization, showing that it is a long process from late magmatic to hydrothermal stage, influenced by mantle fluids and meteoric waters.
Article
Geology
Shilin Li, Wei Zhang, Jiali Cai, Fangyue Wang, Wei Terry Chen
Summary: This study investigates the internal textures and genetic models of fluorite in the Muluozhai carbonatite-related REE deposit in Southwest China. The results show that the textures of fluorite are related to interactions with multiple-stage fluids, and early-stage xenocrysts are common in late-generation veins of carbonatite-related vein systems, which has significant implications for understanding the ore genesis.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
H. Evren Cubukcu, Erkan Aydar, Inan Ulusoy, Alain Gourgaud
Summary: The study explores the composition and formation process of the volcanic rocks in Bodrum Caldera, located at the southwestern tip of the Anatolian plate. Through chemical analysis and mineralogical characteristics of the rocks, it reveals that mixing and mingling of different magmas were important processes for the evolution of volcanic activity. The evolution of the rocks is found to be derived from different degrees of partial melting and magma mixing.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Tapasya Singh, Dewashish Upadhyay, Ashim K. Patel, Biswajit Mishra
Summary: Recent experimental works suggest that complexation with alkalis, carbonate, and hydroxyl groups enhances rare earth element (REE) transport and fractionation, seen in carbonatite-hosted REE deposits. This study analyzed the composition of fluorite-hosted fluid inclusions and the trace element chemistry of calcite and fluorite in the Amba Dongar carbonatite complex in western India. The results indicate high concentrations of alkalis, silicon, aluminum, magnesium, and manganese in the fluid inclusions, as well as higher concentrations of light rare earth elements (LREE) compared to other hydrothermal settings. This supports the finding that alkali-carbonate-hydroxyl complexation helps mobilize REEs and fractionate LREE from heavy (MREE and HREE) rare earth elements.
Article
Geology
Ali Kaya, Oemer Bozkaya
Summary: A gypsum interlayer with 100 m thick was discovered in the Keban Metamorphics in southeast Turkey. The gypsum underwent hydrothermal alteration caused by late Cretaceous magmatic intrusions, resulting in dissolution, recrystallization, and the formation of secondary gypsum. The geochemical compositions of the gypsum indicate marine evaporite compositions.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
A. Sasmaz, P. Zuddas, M. Cangemi, D. Piazzese, G. Ozek, M. Venturi, P. Censi
Summary: This study investigated the distribution of Zr, Hf, and rare earth elements in a hydrothermal system in southeastern Turkey, finding that dissolved Hf is partitioned relative to Zr during calcite formation. The observed fractionation is explained by coulombic interactions at the calcite-water interface, with carbonate minerals demonstrating greater reactivity towards aqueous Hf-bearing species relative to Zr-complexes. The results suggest that authigenic calcite can serve as a suitable host for adsorbing dissolved metal ion species to remediate mine drainage.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2021)
Article
Geochemistry & Geophysics
Derya Yildirim Gundogar, Ahmet Sasmaz
Summary: This study aims to analyze the precipitation parameters of the Tethyan phosphates. The results show that these phosphates are rich in major oxides and trace elements, and have similar rare earth element patterns to PAAS. The formation of the phosphates occurred under oxic and suboxic marine conditions, possibly on slopes with strong upwelling from an organic-rich basin in deeper seawater.
Article
Geochemistry & Geophysics
Hyon Chol Won, Po Hyon Hwang, Kum Chol Chon
Summary: This study demonstrates that the alkaline intrusions of the Sakju Complex in DPR Korea contain significant amounts of REEs and fluorite. REE deposits associated with alkaline igneous rocks are typically lower grade but with larger tonnage and a higher content of critical HREE. The constituent rocks of the Sakju Complex show similar distribution patterns of REEs, rich in LREE but deficient in HREE. Furthermore, the study suggests that the intensity of REE mineralization and fluorite mineralization increases with darker fluorite colors and higher total REE contents in the rocks.
GEOCHEMISTRY INTERNATIONAL
(2022)
Article
Geology
Shuang-Liang Liu, Hong-Rui Fan, Xuan Liu, Jianyin Meng, Alan R. Butcher, Lahaye Yann, Kui-Feng Yang, Xiao-Chun Li
Summary: Rare earth elements (REE) are critical raw materials in low-carbon technologies, and the global supply is being affected by new projects. However, comprehensive data on these projects are lacking, hindering investors and policymakers. This study establishes a new REE project database, presenting the current situation and future perspectives.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Serguei G. Soloviev, Sergey G. Kryazhev, Vasily N. Shapovalenko, Gregory S. Collins, Svetlana S. Dvurechenskaya, Daria S. Bukhanova, Anton Ezhov, Konstantin Voskresensky
Summary: The Kirganik prospect is a silica-undersaturated, shoshonite-related, alkalic, porphyry Cu-Au system developed within the Late Cretaceous island arc of Central Kamchatka. It exhibits a subduction-related, island arc rock affinity.
ORE GEOLOGY REVIEWS
(2021)
Editorial Material
Geosciences, Multidisciplinary
Ele Willoughby
Summary: This article traces the history of glass etching with hydrofluoric acid and explores the modern applications of fluorite in optics.
Article
Engineering, Environmental
Xiao-Rui Liu, Wen-Shen Liu, Ye-Tao Tang, Shi-Zhong Wang, Ying-Jie Cao, Zi-Wu Chen, Can-Die Xie, Chang Liu, Mei-Na Guo, Rong-Liang Qiu
Summary: In situ leaching of ion-adsorption rare earth element (REE) deposits has led to the release of large amounts of REE-containing wastewater, but there is limited understanding of the origin, distribution, and migration of REEs in aqueous systems. This study investigated a catchment affected by mining activities in South China and found that REE concentrations in groundwater and surface water decreased from upstream to downstream. The study also revealed the transformation of REEs from different chemical species and their enrichment patterns in soil and water.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Geochemistry & Geophysics
Ali Tugcan Unluer, Murat Budakoglu, Zeynep Doner, Amr Abdelnasser
Summary: Carbonatite complexes and associated fenite zones are known for their high-grade rare metal ores, with the Ozvatan complex in Central Anatolia, Turkey being an example of post-collisional carbonatitic magmatism. The complex contains silica-undersaturated ultra-alkaline rocks, carbonatite dikes, and fenite zones. The carbonatites are dominated by calcite minerals with fluorite phenocrysts and may contain minor amounts of silicate minerals. The fenite zones consist of nephelines, K-feldspars, aegirines, augites, and garnets. The carbonatites and fenite zones host a variety of incompatible elements.
Article
Environmental Sciences
Merve Sasmaz, Bunyamin Akgul, Ahmet Sasmaz
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2015)
Article
Environmental Sciences
Merve Sasmaz, Bunyamin Akgul, Derya Yildirim, Ahmet Sasmaz
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2016)
Article
Environmental Sciences
Merve Sasmaz, Bunyamin Akgul, Derya Yildirim, Ahmet Sasmaz
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2016)
Article
Geology
Ahmet Sasmaz, Nataliya Kryuchenko, Edward Zhovinsky, Vasily Suyarko, Nevin Konakci, Bunyamin Akgul
ORE GEOLOGY REVIEWS
(2018)
Article
Spectroscopy
Ahmet Sasmaz, Ayse Didem Kilic, Bunyamin Akgul, Bilge Sasmaz
Summary: This study investigated garnets and inclusions formed in the contact zone of Pertek granitoid and Keban marble. The main mineral assemblage observed in the skarn formation is diopside, garnet, quartz, magnetite, calcite, and pyrite. Raman spectroscopy studies revealed that the idiomorphic and semi-idiomorphic garnets are predominantly grossular, andradite, and uvarovite in the core. The chondrite-normalized REE patterns of all garnets in the study area show similar trends and are generally depleted in HREE and enriched in LREE, mainly controlled by adsorption.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Environmental Sciences
Mahmut Palutoglu, Bunyamin Akgul, Vasily Suyarko, Myroslava Yakovenko, Nataliya Kryuchenko, Ahmet Sasmaz
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2018)
Article
Geosciences, Multidisciplinary
Sevcan Kurum, Bunyamin Akgul, Emin Erdem
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2006)
Article
Geochemistry & Geophysics
A Sasmaz, A Onal, A Sagiroglu, M Onal, B Akgul
GEOCHEMICAL JOURNAL
(2005)
Article
Geosciences, Multidisciplinary
A Sasmaz, F Yavuz, A Sagiroglu, B Akgul
JOURNAL OF ASIAN EARTH SCIENCES
(2005)
Article
Geology
H Kargi, B Akgul, M Akgul
INTERNATIONAL GEOLOGY REVIEW
(2003)
Article
Geosciences, Multidisciplinary
Samuel Yaw Danso, Yi Ma, Adams Osman, Isaac Yeboah Addo
Summary: This study conducted a spatial assessment and mapping of flood hazards in the Sekondi-Takoradi Metropolis (STM) of Ghana using the Analytical Hierarchy Process (AHP) and geographical information system. The results indicate that about 12% of STM lands are in very high flood zones and 24% are in high flood zones. The lower portions of STM are identified as the most susceptible to inundation. These findings provide valuable insights for effective flood planning and prevention in STM.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Kesyton Oyamenda Ozegin, Stephen Olubusola Ilugbo
Summary: The study utilizes analytical hierarchical process and geoinformatics-based approaches to define groundwater potential zones in Edo State, Nigeria. The results show that high groundwater potential zones are mainly located in Edo-central and isolated portions of Edo-south, while low to very low potential zones are found in the study's northern region.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maham Eboubekrine Sedigh, Houssa Ouali, Michel Jebrak, Abdelkader Mokhtari
Summary: The carbonatites from the Richat dome in Mauritania are unique and underdocumented geological features. This study provides insight into the mineralogy and petrogenesis of the carbonatites, revealing three identified types and their association with spinel-bearing peridotite. The geochemical characteristics of the Richat carbonatites are similar to other Cretaceous alkaline carbonatite occurrences in different regions, suggesting a common geological process. The reactivation of a deep pan-African lineament is considered a fundamental factor in the formation of the Richat carbonatites.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Riadh Aouissi, Gamal Mohamed El Qot, Sihem Salmi-Laouar, Catalina Gomez-Espinosa, Blanca E. Buitron-Sanchez
Summary: Twenty-one gastropod species have been identified in the Cenomanian deposits of Bellezma-Aures mountains, eastern Saharan Atlas, Algeria, with four of them recorded for the first time in the Batna mountains. These gastropods are mainly found in the 'Marnes de Smail' Formation, and their community changes may be attributed to minor sea-level fluctuations, sedimentation rate variations, and hydrodynamics. The paleobiogeographic distribution of these gastropod assemblages indicates a tethyan affinity and faunal exchange during that time interval.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Behnam Esmaeili, Sirous Hosseinzadeh, Ali Kadkhodaie, David A. Wood, Samira Akbarzadeh
Summary: This research applies image analysis and clustering algorithms to estimate porosity and permeability of petroleum reservoir rocks, and demonstrates that the results from image analysis are consistent with traditional analysis methods, with acceptable correlation. In addition, different depositional environments and hydraulic flow units are identified through image analysis.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jianqi Zhuang, Jianbing Peng, Zhenhong Li, Yanqiu Leng, Xinghua Zhu, Weiliang Huang, Zhijie Jia, Yang Liu, Yi Zhu
Summary: The study on gully erosion in the East African Rift Valley of Kenya reveals that human activities and rainstorms are the main factors causing erosion. Gully erosion poses a serious threat to the ecological environment, particularly the man-made and fissure-induced gullies that should be further investigated.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)