Article
Geology
Jakub Ryznar, Jaroslav Prsek, Adam Wlodek, Pavel Uher
Summary: Our study provides a detailed characterization of Ta-Nb oxides from the Bugarura - Kuluti deposit in eastern Rwanda. It presents the chemical evolution of oxides at different scales and proposes an evolutionary model for the magmatic-hydrothermal system hosting Ta-Nb-Sn mineralization. The research highlights the various compositions and textures of these oxides, including columbite group minerals, wodginite, tapiolite, and microlite.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Claude Nambaje, M. Satish-Kumar, Ian S. Williams, Toshiro Takahashi, K. Sajeev
Summary: Petrological, geochemical, and geochronological studies of granitic rocks from the Karagwe-Ankole Belt (KAB) have revealed the tectonic setting and evolution of the orogenic belt. The different types of granitic rocks within the KAB provide insight into the geodynamics and formation processes of the region.
Article
Geosciences, Multidisciplinary
Johanna Van Daele, Dominique Jacques, Niels Hulsbosch, Stijn Dewaele, Philippe Muchez
Summary: The study focuses on the tectonic history of the Mesoproterozoic Karagwe-Ankole Belt in Central Africa's Western Domain, revealing two generations of folding believed to be the result of two separate compressional deformation events. The development of quartz veins provides chronological data, showing differences in tectonic history between the Western and Eastern Domain in the study area.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
S. De Clercq, D. Chew, G. O'Sullivan, T. De Putter, J. De Grave, S. Dewaele
Summary: The KAB region in Central Africa is characterized by the poorly understood Karagwe-Ankole belt (KAB), which contains various generations of granites with hypotheses regarding their emplacement. The youngest generation of granites, G4, are associated with Sn-W-Ta ore deposits and are considered to be parental granites. Through geochemical analysis and U-Pb zircon dating, it was found that G4 granites contain xenocrystic zircon, indicating inheritance of older granites or basement rocks. The geochemical variability and presence of xenocrystic zircons suggest localized melting from a heterogeneous source, favoring an intracontinental setting.
PRECAMBRIAN RESEARCH
(2021)
Article
Geology
Serguei G. Soloviev, Sergey G. Kryazhev, Vasily N. Shapovalenko, Svetlana S. Dvurechenskaya, Dina Semenova, Yury A. Kalinin, Konstantin Voskresensky, Nina Sidorova
Summary: The Glafirinskoe and related skarn Cu-Au (+Mo, W) deposits represent an Early Paleozoic mineralization in the Altaid Belt, associated with multiphase plutons of high-K calc-alkaline to shoshonitic rocks. Isotopic dating suggests an early Ordovician age, with mineralization occurring in a post-collisional setting involving the stall and break-off of the subduction slab during the Late Cambrian to Early Ordovician. Various sulfides and sulfosalts are found in the deposits, which also indicate high exploration potential for additional mineral deposits in the vicinity.
ORE GEOLOGY REVIEWS
(2021)
Article
Geology
Yaoqing Luo, Ping Shen, Chong Cao, Haoxuan Feng, Changhao Li, Yingxiong Bai, Qingyu Suo
Summary: The Shangkelan granite-pegmatite in the Chinese Altai is known for its zonation and tungsten mineralization, but the genetic relationship and mineralization mechanism have been unclear. This study uses U-Pb dating, Nd isotopic composition, and chemical analysis to reveal that the granite and pegmatite have the same age and similar isotopic compositions. The findings suggest that the granite is parental to the pegmatite and they were formed through fractional crystallization from a common magma source.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Serguei G. Soloviev, Sergey G. Kryazhev, Svetlana S. Dvurechenskaya, Valentin S. Kryazhev, Mulid S. Emkuzhev, Nikolay S. Bortnikov
Summary: The Tyrnyauz deposit is the largest W skarn deposit in Russia and the FSU, with unique characteristics such as large mineralized skarn zones and overprinting wider systems of post-skarn quartz-garnetpyroxene. This deposit is associated with at least two separate igneous suites, suggesting a complex geological history. The superposition of different igneous suites and related mineralization styles may have played a key role in the formation of this giant metal endowment.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Karel Breiter, Jana Durisova, Zuzana Korbelova, Michaela Vasinova Galiova, Michaela Hlozkova
Summary: Core samples from Panasqueira tungsten deposit in Portugal were analyzed chemically and petrographically. The results reveal a complex granite body consisting of a cupola of porphyritic granite, a stock of greisenized leucogranite, and quartz veins rich in wolframite. The deposit formed through three stages of intrusion, greisenization, and hydraulic fracturing, indicating the involvement of hydrothermal fluids from deep parts of the granite body.
Review
Geochemistry & Geophysics
Encarnacion Roda-Robles, Pedro Pablo Gil-Crespo, Alfonso Pesquera, Alexandre Lima, Idoia Garate-Olave, Enrique Merino-Martinez, Joana Cardoso-Fernandes, Jon Errandonea-Martin
Summary: Apatite can serve as a useful tool for studying the evolution of granitic magmas and exploration of pegmatites. The composition of apatite varies in different types of rocks, with increasing manganese content associated with magma evolution, while decreasing rare earth elements content. Apatite can provide valuable information about the petrogenesis of pegmatites and granites.
Article
Geosciences, Multidisciplinary
Alongkot Fanka, Jaruphichaya Tadthai
Summary: Lithium-bearing pegmatites and granitic rocks in the Phang Nga area in southern Thailand are closely related to tin deposits in the SE Asian tin belt. These rocks have peraluminous S-type granite affinity and reflect the collisional setting during the Cretaceous to the Eocene.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Janina Wiszniewska, Ewa Krzeminska
Summary: The Mesoproterozoic Suwalki anorthosite massif in NE Poland was intruded into a late Palaeoproterozoic domain in southeastern Fennoscandia. New zircon SHRIMP ages show that anorthosites and rapakivi-type granites in the SAM massif were intruded in pulses around 1515-1507 Ma, younger than previously thought. The rocks exhibit two-step crystallization and continuous crystallization during magma chamber formation and emplacement.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Jie-Hua Yang, Heng Chen, Mei-Fu Zhou, Rui-Zhong Hu, Anthony E. Williams-Jones
Summary: The Xihuashan and Yaogangxian granitic plutons in South China consist of highly evolved, multiphase, Li-rich granites and host quartz-vein-type tungsten deposits. The Li isotopic compositions in the granite phases of both plutons are influenced by the chemical evolution of the magmas, as indicated by correlations with SiO2 and Li concentrations, as well as Rb/Sr, Nb/Ta, and Zr/Hf ratios. The lithium isotope behavior observed in this study provides new insights into magmatic differentiation and associated rare-metal mineralization.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Jaroslav Dostal, Ochir Gerel
Summary: Niobium and tantalum, two rare metals with similar properties, are considered crucial for the economy and national security of many industrial countries. In Mongolia, these metals are primarily associated with specific types of rocks, and their mining potential has not been fully explored.
Article
Geology
S. Leal, A. Lima, J. Morris, M. Pedro, F. Noronha
Summary: The Numao gold deposit in the northern part of the Iberian Variscan belt is controlled by second and third-order structures near the regional first-order Vilarica-Manteigas fault system. The deposit consists of disseminated sulfides, arsenopyrite-quartz veins, and sulfides-scheelite-quartz veins. The ore mineral assemblage includes scheelite, arsenopyrite, chalcopyrite, bismuth, and Au-Ag mineral phases.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Hui Wang, Chengyou Feng, Rongxi Li, Chao Zhao, Peng Liu, Guanghua Wang, Yujie Hao
Summary: The Xingluokeng deposit is the largest tungsten deposit in the Wuyi metallogenic belt, mainly occurring in altered granitic stock with vein-type scheelite and wolframite mineralization. Petrographic observations and geochemical analyses suggest that the Xingluokeng stock experienced intense fractional crystallization and assimilation of country rocks. Zircon U-Pb geochronology and trace element analyses indicate contemporaneous emplacement of G1 and G2 at around 152 Ma with similar oxygen fugacity conditions.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
S. Dewaele, F. De Clercq, N. Hulsbosch, K. Piessens, A. Boyce, R. Burgess, Ph. Muchez
MINERALIUM DEPOSITA
(2016)
Article
Geosciences, Multidisciplinary
David Debruyne, Niels Hulsbosch, Jorik Van Wilderode, Lieve Balcaen, Frank Vanhaecke, Philippe Muchez
PRECAMBRIAN RESEARCH
(2015)
Article
Geology
S. Dewaele, N. Hulsbosch, Y. Cryns, A. Boyce, R. Burgess, Ph Muchez
ORE GEOLOGY REVIEWS
(2016)
Review
Geology
David Debruyne, Niels Hulsbosch, Philippe Muchez
ORE GEOLOGY REVIEWS
(2016)
Article
Geosciences, Multidisciplinary
Niels Hulsbosch, Johanna Van Daele, Nathan Reinders, Stijn Dewaele, Dominique Jacques, Philippe Muchez
JOURNAL OF AFRICAN EARTH SCIENCES
(2017)
Article
Geochemistry & Geophysics
Niels Hulsbosch, Jan Hertogen, Stijn Dewaele, Luc Andre, Philippe Muchez
GEOCHIMICA ET COSMOCHIMICA ACTA
(2014)
Article
Geology
J. Van Daele, N. Hulsbosch, S. Dewaele, M-C Boiron, K. Piessens, A. Boyce, Ph Muchez
ORE GEOLOGY REVIEWS
(2018)
Article
Geochemistry & Geophysics
Niels Hulsbosch, Marie-Christine Boiron, Rainer Thomas, Johanna Van Daele, Stijn Dewaele, Philippe Muchez
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geochemistry & Geophysics
Niels Hulsbosch, Philippe Muchez
Article
Spectroscopy
Fernando Prado Araujo, Niels Hulsbosch, Philippe Muchez
Summary: Phosphates are a group of complex minerals that can crystallize in various environments, with environmental changes during crystallization reflected in the formation of a sequence of phosphate minerals known as paragenesis. Raman mapping with high spatial resolution can successfully detect mineralogical changes in complex assemblages and determine the paragenetic sequence. Raman spectroscopy is advantageous due to its minimal sample preparation, nondestructive nature, and capability to identify hydrated minerals and phases composed of light elements.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Mineralogy
Niels Hulsbosch, Rainer Thomas, Marie-Christine Boiron, Stijn Dewaele, Philippe Muchez
CANADIAN MINERALOGIST
(2017)
Article
Geology
Niels Hulsbosch, Jan Hertogen, Stijn Dewaele, Luc Andre, Philippe Muchez
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)