Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Xiao-Chun Li, Daniel E. Harlov, Mei-Fu Zhou, Hao Hu
Summary: A series of fluid/apatite reaction experiments were conducted to understand the effect of fluid-induced alteration on the Sm-Nd isotope system in apatite. The experimental results showed that fluid chemistry is the main factor controlling the response of the Sm-Nd isotopic system to fluid-induced alteration. When the fluids are rich in ligands that can facilitate REE mobilization and fractionation, the Sm-147/Nd-144 ratio of apatite can be highly modified, indicating the importance of evaluating the fluid-rock history and chemistry before using apatite Sm-Nd isotopes as geological indicators.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Editorial Material
Geochemistry & Geophysics
Meisam Gholipoor, Mehrdad Barati, Ebrahim Tale Fazel, Vratislav Hurai
Summary: The Lakeh Siah iron oxide-apatite deposit occurs within the Cambrian volcanic rocks. Magnetite is the dominant ore mineral, accompanied by apatite, amphibole, diopside, calcite, and andradite garnet. Apatite, allanite, and titanite are the main rare earth element (REE)-bearing minerals.
MINERALIUM DEPOSITA
(2023)
Article
Geology
Maria Maraszewska, Jaroslaw Majka, Daniel E. Harlov, Maciej Manecki, David A. Schneider, Igor Broska, Per-Inge Myhre
Summary: A set of small iron oxide-apatite (IOA) ore bodies have been discovered in a crustal shear zone in Prins Karls Forland, Svalbard Archipelago. These ore bodies have undergone multi-stage tectonothermal and metasomatic processes, resulting in various styles of deformation and distinct mineral assemblages. The ores were formed through the alteration of apatite and subsequent deposition of monazite and xenotime, with the transport of dissolved REE and P likely enhanced by deformation. The involvement of compositionally different fluids during the tectonothermal evolution of Prins Karls Forland suggests that these IOA ore bodies resulted from the fractionation of Fe, P, Ca, and REE from hypersaline fluids associated with gabbroic rocks.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Long Zhang, Fangyue Wang, Taofa Zhou, Zhenyu Chen
Summary: This study investigates the potential of allanite as a mineral probe for granite-related uranium mineralization processes and the formation of ion-adsorption REE deposits. It is found that alteration of allanite in the Changjiang granite was likely caused by oxidized fluids rich in fluorine and carbon dioxide. The ages of the brighter and darker domains of allanite grains are consistent with zircon ages and uranium mineralization events in the Changjiang uranium ore field. Rare earth elements released from the altered allanites during alteration were precipitated as REE-fluorocarbonates, contributing to the formation of ion-adsorption REE deposits.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Lei Ji, Fulai Liu, Daniel Harlov, Fang Wang
Summary: The study investigates the role of fluids in a granite to metagranite metamorphism process by analyzing the microtextures and mineral chemistry of monazite, magnetite, and pyrite. Results indicate that external NaCl and sulphate-bearing fluids infiltrated the granite and induced the formation of pyrite enriched the pre-existing monazite in S around 1904 Ma. Later fluids from the same evaporite deposit formed the bright mantle around monazite.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Multidisciplinary Sciences
Guangyu Huang, Ross N. Mitchell, Richard M. Palin, Christopher J. Spencer, Jinghui Guo
Summary: Earth's earliest continental crust, dominated by tonalite-trondhjemite-granodiorite (TTG) suites, provides important insights into the global geodynamic regime during the Archaean period. The tectonic setting of TTG magmatism is controversial, with debates on whether subduction was involved. Petrological modeling suggests that high geothermal gradients in hot subduction zones produce Ba-rich TTG, indicating the onset of subduction. Analysis of Ba contents in TTG suites worldwide reveals significant increases from regional to global subduction events occurring between 4 Ga and 2.7 Ga.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Bruno V. Ribeiro, Christopher L. Kirkland, Michael I. H. Hartnady, Erin L. Martin, Emily West, Paul Polito
Summary: The Nifty Cu deposit in Western Australia's Paterson Province is a prominent Cu deposit in the Neoproterozoic. The timing of mineralization at Nifty remains uncertain despite attempts to date it using various isotopic methods. This study used in situ apatite and monazite U-Pb isotopes to determine the age of the mineralized veins and matrix of the host-rock, revealing at least two distinct hydrothermal/fluid flow events associated with the formation of the Nifty Cu deposit.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Dipak C. Pal, Sanchayeeta Basak, Chris McFarlane, A. K. Sarangi
Summary: The Singhbhum shear zone (SSZ) in eastern India is known for its uranium and copper deposits enriched in rare earth elements. This study provides insight into the protracted evolutionary history of the SSZ, spanning approximately 900 million years, with multiple stages of rare earth mineralization occurring in the Paleoproterozoic era in different pulses.
PRECAMBRIAN RESEARCH
(2021)
Article
Geology
Xu Zhao, Ning-Bo Li, He-Cai Niu, Yu-hang Jiang, Shuang Yan, Yu-Yuan Yang, Rui-Xin Fu
Summary: This study investigates the main LREE-bearing mineral (allanite) in the Bachi ion adsorption LREE deposit in South China and finds that the structural and geochemical changes from primary allanite to altered allanite make it easier for the allanite to be weathered, leading to the formation of ion adsorption LREE deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Ashim Kumar Patel, Dewashish Upadhyay, Biswajit Mishra, Kamal Lochan Pruseth
Summary: Calcite carbonatites from the Kamthai alkaline complex in western India are highly enriched in Sr and REE due to their formation from highly differentiated carbonatitic magma. Primary carbocernaite, calcite, and britholite sequester Sr and REE from the brine-rich melt and constitute the major sources of these elements during hydrothermal redistribution. Replacement textures suggest fluid-assisted, post-magmatic hydrothermal REE redistribution through dissolution-reprecipitation process.
Article
Geochemistry & Geophysics
Zhi-Kun Su, Xin-Fu Zhao, Christina Yan Wang, Zhi-Min Zhu, Wen-Lei Song, Carl Spandler
Summary: This study provides robust evidence for the survival of whole-rock Sm-Nd isotopes in the presence of multistage hydrothermal alteration. The Lala Fe-Cu-REE deposit in southwestern China is host to a variety of REE-rich minerals that underwent extensive metasomatic alteration. The results show that despite resetting of major REE minerals, the whole-rock Sm-Nd isotopic system remained closed.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Rachid Benaouda, Dennis Kraemer, Sara Bejtullahu, Abdellah Mouttaqi, Michael Bau
Summary: High-grade REE-bearing granitic pegmatites and carbonatite dykes were discovered in the Aghracha area, South Morocco. The geochemistry suggests that these rocks likely formed from magma mixing of underplated mafic rocks and a small amount of crustal rocks. The Aghracha pegmatites are rich in epidote, while calcite carbonatite dykes occur in the Laachariyat area.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geology
Zhi Zhao, Denghong Wang, Leon Bagas, Zhenyu Chen
Summary: The Zhaibei Granite in southern China is a deposit rich in ion-adsorption light rare earth elements (LREE), with recent reports of heavy rare earth elements (HREE) ores also being found. The genesis of this rare earth element deposit was determined by analyzing the petrological, geochemical, and mineralogical characteristics of the Zhaibei pluton. The granite was likely formed through magma crystallization differentiation, influenced by reactions with late-magmatic F-, CO2-, and REE-rich fluids.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
J. Caleb Chappell, Alexander P. Gysi, Thomas Monecke, Zhaoshan Chang
Summary: Apatite dissolution experiments were conducted to study its alteration during fluid-rock interaction at low temperatures. The results show that apatite dissolves and forms etch pits and dissolution channels, with the dissolution extent increasing with temperature, acidity, and salinity of the fluid. The dissolution also releases rare earth elements and leads to the formation of monazite-(Ce) and secondary apatite.
AMERICAN MINERALOGIST
(2023)
Article
Geosciences, Multidisciplinary
Khaled M. Abdelfadil, Nasser M. Mahdy, Martin Ondrejka, Marian Putis
Summary: The Wadi Muweilha muscovite pegmatite is influenced by the final stage of the East African Orogen in the Arabian Nubian Shield. It contains a variety of minerals that show deformations and suggest an igneous origin. The ages of the minerals provide insights into the geological and magmatic activities.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Mineralogy
Martin Ondrejka, Alexandra Molnarova, Marian Putis, Peter Bacik, Pavel Uher, Bronislava Volekova, Stanislava Milovska, Tomas Mikus, Libor Pukancik
Summary: Two distinct reaction coronae were observed around rare earth element phosphates in Variscan metagranitic rocks in the Western Carpathians, Slovakia. The breakdown of primary magmatic monazite-(Ce) resulted in the formation of fluorapatite, clinozoisite, allanite-(Ce), and secondary monazite-(Ce). The alteration of xenotime-(Y) led to the development of a novel secondary corona composed of large fluorapatite crystals and tiny satellite crystals of hellandite-(Y) and hingganite-(Y).
MINERALOGICAL MAGAZINE
(2022)
Article
Geochemistry & Geophysics
Petra Kozakova, Marcel Miglierini, Maria Caplovicova, Radek Skoda, Peter Bacik
Summary: A heat treatment was conducted on selected epidote and clinozoisite crystals to investigate their changes in optical and crystal-chemical properties. Decomposition of the epidote-clinozoisite solid solution occurred at temperatures ranging from 1000 to 1200 degrees C, resulting in the formation of pyroxene, wollastonite, and anorthite as breakdown products.
Article
Geosciences, Multidisciplinary
Martin Ondrejka, Rastislav Vojtko, Marian Putis, David M. Chew, Mario Olsavsky, Pavel Uher, Ondrej Nemec, Foteini Drakou, Alexandra Molnarova, Jan Spisiak
Summary: This study conducted in-situ isotopic dating on volcanic rocks from the Poniky area for the first time. The results showed a genetic link between these rocks and similar rocks from adjacent areas in the mid-Permian. The crystallization temperatures of the rocks were determined to be between -910 and 935℃ based on zircon geothermometry. These findings suggest that the A-type magmatism in the Poniky area is related to the intraplate extensional tectonic regime and the break-up of the Pangea supercontinent.
GEOLOGICA CARPATHICA
(2022)
Article
Mineralogy
Pavel Uher, Daniel Ozdin, Peter Bacik, Martin Stevko, Martin Ondrejka, Olena Rybnikova, Stepan Chladek, Jana Fridrichova, Jaroslav Prsek, Lubica Puskelova
Summary: The beryllium silicate minerals phenakite and bertrandite have been found in the granitic pegmatite dykes of Variscan age in the Western Carpathians of Slovakia. They are associated with secondary minerals such as quartz, K-feldspar, and muscovite. The breakdown of magmatic beryl to these secondary assemblages, including phenakite and bertrandite, was likely caused by aqueous K-bearing fluids during the post-magmatic stage.
MINERALOGICAL MAGAZINE
(2022)
Article
Geochemistry & Geophysics
Peter Bacik, Jana Fridrichova, Olena Rybnikova, Jan Stubna, Ludmila Illasova, Radek Skoda, Tomas Vaculovic, Zuzana Pulisova, Peter Seckar
Summary: A complex crystal-chemical investigation, using spectroscopic methods, EMPA, and LA-ICP-MS, was conducted on sphalerite samples from the Banska Stiavnica ore district. Different colors of sphalerite have different associated minerals, and Cd and Fe substitute for Zn with variable proportions. Mn, Co, and Cu are also present in significant amounts. The optical absorption spectra reveal absorption peaks attributed to crystal-field transitions of Fe2+, and the colors of sphalerite are determined by the absorption patterns.
Article
Geochemistry & Geophysics
Martin Ondrejka, Pavel Uher, Stefan Ferenc, Stanislava Milovska, Tomas Mikus, Alexandra Molnarova, Radek Skoda, Richard Kopacik, Peter Bacik
Summary: A hydrothermal quartz vein in Zimna Voda, Slovakia, contains unique REE minerals and shows strong fractionation towards MREE, especially Gd. The substantial incorporation of Gd into monazite and xenotime structures suggests differently sized REE3+ miscibility in solid solutions. The high Gd concentrations in these minerals reflect the alteration of primary uranium minerals by low-temperature hydrothermal fluids.
AMERICAN MINERALOGIST
(2023)
Article
Geosciences, Multidisciplinary
Mohamed Abd El Monsef, Mabrouk Sami, Fatma Toksoy-Koksal, Rainer Abart, Martin Ondrejka, Khaled M. Abdelfadil
Summary: The rare metals of Abu Dabbab area in the Central Eastern Desert of Egypt were studied for their mineralogy and conditions of precipitation through EMPA and fluid inclusions analysis, in order to determine their source, formation mechanism, and evolutionary model. The area contains (Ta-Nb-Sn) -bearing minerals such as columbite group minerals (CGMs), wodginite, and cassiterite. The study found distinct compositional differences between early-phase and late-phase minerals, suggesting magmatic and late magmatic Ta-rich fluids played a role in their formation. Fluid inclusions microthermometry revealed a transition between magmatic and late to post-hydrothermal activities, with meteoric fluid possibly contributing to the polymetallic deposits.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Spectroscopy
Olena Rybnikova, Peter Bacik, Pavel Uher, Jana Fridrichova, Bronislava Lalinska-Volekova, Monika Kubernatova, Radek Hanus
Summary: This article focuses on the application of Raman spectroscopy for the identification and differentiation of various chrysoberyl varieties, inclusion analysis, detection of synthetic analogues and imitations, and determination of faceted stone orientation.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Mineralogy
Martin Ondrejka, Pavel Uher, Stefan Ferenc, Juraj Majzlan, Kilian Pollok, Tomas Mikus, Stanislava Milovska, Alexandra Molnarova, Radek Skoda, Richard Kopacik, Sergii Kurylo, Peter Bacik
Summary: A new mineral, monazite-(Gd), has been discovered near Kosice, Slovakia. It is closely associated with monazite-(Sm), Gd-bearing xenotime-(Y), Gd-bearing hingganite-(Y), fluorapatite, and uraninite. It has a chemical formula of GdPO4.
MINERALOGICAL MAGAZINE
(2023)
Article
Mineralogy
Olena Rybnikova, Pavel Uher, Milan Novak, Stepan Chladek, Peter Bacik, Sergii Kurylo, Tomas Vaculovic
Summary: The Marsikov-Schinderhubel III pegmatite in the Hrub Jesenik Mountains, Czech Republic, is an example of a chrysoberyl-bearing LCT granitic pegmatite. Chrysoberyl crystals occur in albite-rich units and have complex microtextures. The pegmatite underwent deformation and metamorphism, resulting in the transformation of primary magmatic minerals to secondary minerals.
MINERALOGICAL MAGAZINE
(2023)
Article
Mineralogy
Peter Bacik, Manfred Wildner, Jan Cempirek, Radek Skoda, Peter Cibula, Tomas Vaculovic
Summary: The presence and position of vanadium in tanzanite, a valuable variety of zoisite, were examined using structural refinement and optical absorption spectra analysis. The results suggest that vanadium is likely to occupy the M1,2 site, and can exist in both trivalent and four-valent states in the crystal structure of zoisite-tanzanite. (The presence and position of vanadium in tanzanite, a valuable variety of zoisite, were examined using structural refinement and optical absorption spectra analysis. The results suggest that vanadium is likely to occupy the M1,2 site, and can exist in both trivalent and four-valent states in the crystal structure of zoisite-tanzanite.)
MINERALOGICAL MAGAZINE
(2023)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.