Article
Energy & Fuels
Lianqiang Zhu, Zezhang Song, Xingwang Tian, Guangdi Liu, Dailin Yang, Wenzhi Wang, Gang Zhou, Wei Yan, Zhu Xiang, Zili Zhang, Qiang Li
Summary: This study investigates the effects of hydrothermal activities on reservoirs and paleo-oil reservoirs in central Sichuan. By analyzing the optical textures and trace element composition of pyrobitumen, the researchers were able to classify the pyrobitumen into different categories and discuss the responses to hydrothermal alteration. The results show that the hydrothermal alteration widely develops in central Sichuan and should be further studied in relation to hydrocarbon accumulation.
Article
Geochemistry & Geophysics
Ruolin Liu, Junhong Zhao, Meifu Zhou, Han Qi
Summary: This study investigates the trace element compositions of chromite in the Jinchang ophiolite in southwest China and reveals that they can be altered during subsolidus re-equilibration and hydrothermal alteration. The study also demonstrates that the microstructures and trace elemental compositions of chromite can record the detailed serpentinization processes.
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
Geology
Nuriya Ayupova, Irina Melekestseva, Valeriy Maslennikov, Sergey Sadykov
Summary: Diagenetically altered thin-layered sulfide ores from the Talgan volcanic-hosted massive sulfide deposit in the South Urals are predominantly composed of pyrite and contain inclusion minerals. These sulfide layers have a variable content of rare earth elements, which is determined by the presence of non-sulfide minerals. The data presented in this study provide insights into the origin and diagenetic processes of layered sulfide ores in volcanic-hosted massive sulfide deposits.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
E. E. Falcone, C. Federico, G. Boudoire
Summary: Metals and REE discharged by submarine hydrothermal vents contaminate seawater and promote metal leaching from sediments, leading to enrichment of some metals and REE in Levante Bay. Fe-oxyhydroxides precipitation removes minor elements and REE. Low pH limits the formation of carbonate complexes with REE, but adsorption onto particles remains effective.
Article
Geology
Wei Zhang, Wei Terry Chen, Xing -Chun Zhang, Yan-Wen Tang
Summary: Quartz is a common mineral in both magmatic-hydrothermal and carbonatite-related rare earth element deposits. Its trace element composition can be used to understand ore genesis in these deposits. Quartz in carbonatite-related REE deposits has low trace element concentrations and can be used to detect concealed carbonatite intrusions.
ORE GEOLOGY REVIEWS
(2022)
Article
Multidisciplinary Sciences
Heng-Ci Tian, Hao Wang, Yi Chen, Wei Yang, Qin Zhou, Chi Zhang, Hong-Lei Lin, Chao Huang, Shi-Tou Wu, Li-Hui Jia, Lei Xu, Di Zhang, Xiao-Guang Li, Rui Chang, Yue-Heng Yang, Lie-Wen Xie, Dan-Ping Zhang, Guang-Liang Zhang, Sai-Hong Yang, Fu-Yuan Wu
Summary: The study of basalt clasts from the PKT returned by Chang'e-5 mission reveals that these two-billion-year-old basalts are not derived from KREEP mantle source, but produced high abundances of rare-earth elements and thorium through low-degree partial melting and extensive fractional crystallization. This suggests that the KREEP association may not be a prerequisite for young mare volcanism, indicating a more sustained cooling history of the lunar interior to generate the Moon's youngest melts.
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)
Article
Geochemistry & Geophysics
Jieqi Xing, Yuhang Jiang, Haiyang Xian, Wubin Yang, Yiping Yang, Wei Tan, Hecai Niu, Hongping He, Jianxi Zhu
Summary: This study investigates the mineralization characteristics of rare earth elements in granite veins in Guizhou Province, China using multiple-scale analysis techniques. The research finds that rare earth elements are mainly enriched in quartz veins and exist in minerals at the micrometer scale, and are re-enriched by hydrothermal alteration. The results provide new insights into the mineralization mechanism and resource storage of rare earth elements.
Article
Geochemistry & Geophysics
Michael J. Heap, Tobias S. Baumann, Marina Rosas-Carbajal, Jean-Christophe Komorowski, H. Albert Gilg, Marlene Villeneuve, Roberto Moretti, Patrick Baud, Lucille Carbillet, Claire Harnett, Thierry Reuschle
Summary: The study shows that hydrothermal alteration significantly increases volcano deformation and collapse volume, decreasing volcano stability and expediting volcano spreading, thus increasing the likelihood of mass wasting events and associated volcanic hazards. Monitoring hydrothermal alteration and its evolution at active volcanoes worldwide is therefore crucial.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Chemistry, Analytical
Sheng He, Yang Li, Li-Guang Wu, Dong-Fa Guo, Zi-Ying Li, Xian-Hua Li
Summary: Zirconium isotopes are a valuable tool for studying geological processes and the evolution of the continental crust. By utilizing secondary ion mass spectrometry, a method has been developed to measure zircon Zr isotope compositions with high accuracy and efficiency, showing promising results for future geological research. The analytical method has been tested on various zircon reference materials, demonstrating excellent repeatability and agreement with other analytical techniques.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Geology
Stanislava Vodrazkova, Tomas Kumpan, Radek Vodrazka, Jiri Fryda, Renata Copjakova, Magdalena Koubova, Axel Munnecke, Jiri Kalvoda, Marketa Hola
Summary: A unique occurrence of ironstone lenses represented by ferruginous oncoids is reported in the offshore Iteporyje Limestone (Lower Devonian, Pragian) from the Prague Basin. The characteristics of the ironstone lenses suggest their biogenic nature, possibly associated with microbial metabolic activities. The study also indicates that hydrothermal fluids are the primary source of ferrous iron.
SEDIMENTARY GEOLOGY
(2022)
Article
Geology
Youliang Chen, Guoxin Zhan, Lipeng Qu, Guiqin Yin, Yanhong Guo, Yuwen Zheng, Rui Guo, Guan Yin, Chengjiang Zhang
Summary: New evidence from isotope geochronology and geochemistry of the Yuanmou-Miyi complexes reveals the Precambrian tectono-magmatism geodynamic process in the study area. The magmatic events at around 1.70 Ga caused the extension-thinning of the continental crust, exerting influence on the subduction-magmatism during the Grenvillian period. The Yuanmou-Miyi complexes between 1.19 and 1.00 Ga show genetic links with subduction-magmatism, characterized by certain geochemical features.
INTERNATIONAL GEOLOGY REVIEW
(2023)
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
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
Alexis Falcin, Jean-Philippe Metaxian, Jerome Mars, Eleonore Stutzmann, Jean-Christophe Komorowski, Roberto Moretti, Marielle Malfante, Francois Beauducel, Jean-Marie Saurel, Celine Dessert, Arnaud Burtin, Guillaume Ucciani, Jean-Bernard de Chabalier, Arnaud Lemarchand
Summary: A machine-learning-based model was proposed and trained to classify seismo-volcanic signals, providing objective and reproducible results. The model showed improved accuracy after including new signal classes and analyzing feature weights. However, the model's universality is limited and may require customization for different volcanoes.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Jean-Marie Saurel, Jordane Corbeau, Sebastien Deroussi, Tristan Didier, Arnaud Lemarchand, Severine Moune, Lloyd Lynch, Anne-Marie Lejeune, Roberto Moretti, Jean-Christophe Komorowski
Summary: The article introduces the regional seismic network established by IPGP and UWI-SRC, designed to provide real-time seismic data to tsunami warning centers in the Caribbean and adjacent regions. By utilizing different techniques and technologies, the cooperative network is able to continue providing data in case of major natural hazards, with Nanometrics' VSAT technology playing a key role in the system.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
David E. Jessop, Severine Moune, Roberto Moretti, Dominique Gibert, Jean-Christophe Komorowski, Vincent Robert, Michael J. Heap, Alexis Bosson, Magali Bonifacie, Sebastien Deroussi, Celine Dessert, Marina Rosas-Carbajal, Arnaud Lemarchand, Arnaud Burtin
Summary: This study analyzed volcanic unrest at La Soufriere de Guadeloupe using airborne thermal camera surveys and in situ measurements. The results showed that the volcano emits 36.5 +/- 7.9 MW of heat, with dominant fumarolic heat flux. The increasing instability of the volcano and the emergence of new high-flux fumaroles highlight the importance of continued surveillance and research strategies.
BULLETIN OF VOLCANOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Abigail Metcalfe, Severine Moune, Jean-Christophe Komorowski, Geoff Kilgour, David E. Jessop, Roberto Moretti, Yoann Legendre
Summary: Signals of volcanic unrest do not always predict future eruptions accurately. By analyzing past eruptions, researchers can uncover patterns that help understand future volcanic behavior. This study on La Soufriere de Guadeloupe reveals that magma storage and interaction timescales at the volcano can be relatively short.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Geological
Marc Peruzzetto, Clara Levy, Yannick Thiery, Gilles Grandjean, Anne Mangeney, Anne-Marie Lejeune, Aude Nachbaur, Yoann Legendre, Benoit Vittecoq, Jean-Marie Saurel, Valerie Clouard, Thomas Dewez, Fabrice R. Fontaine, Martin Mergili, Sophie Lagarde, Jean-Christophe Komorowski, Arnaud Lemarchand, Anne Le Friant
Summary: High discharge debris flows in mountainous and volcanic areas pose significant threats to populations and infrastructures. Modeling these events is challenging due to their complexity and lack of data. This study successfully models a rock avalanche and subsequent remobilization of deposits as a high discharge debris flow using field data and realistic simulation scenarios. The results are consistent with observed data.
ENGINEERING GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Michael J. Heap, David E. Jessop, Fabian B. Wadsworth, Marina Rosas-Carbajal, Jean-Christophe Komorowski, H. Albert Gilg, Nadege Aron, Margaux Buscetti, Laura Gential, Margaux Goupil, Mathilde Masson, Lucie Hervieu, Alexandra R. L. Kushnir, Patrick Baud, Lucille Carbillet, Amy G. Ryan, Roberto Moretti
Summary: The study investigates the thermal properties of variably altered rocks from different volcanic regions. The results show that thermal conductivity and thermal diffusivity decrease with increasing porosity, while specific heat capacity remains relatively unchanged. The effect of alteration on thermal conductivity depends on the rock type, with some rocks showing an increase in thermal conductivity with increasing alteration. Therefore, alteration-induced changes in the thermal properties should be considered when interpreting volcano heat flux data.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Geoffrey A. Lerner, Susanna F. Jenkins, Sylvain J. Charbonnier, Jean-Christophe Komorowski, Peter J. Baxter
Summary: Unconfined pyroclastic density currents (PDCs) are highly dangerous volcanic hazards that can cause significant impacts on inhabited areas. Previous studies have only described a limited number of specific cases of unconfined PDCs. In this study, a comparative analysis is conducted to review the different types of unconfined PDCs, their characteristics, dynamics, and impacts, emphasizing the importance of accounting for these phenomena in emergency management and planning at active volcanoes.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Aude Lavayssiere, Wayne C. Crawford, Jean-Marie Saurel, Claudio Satriano, Nathalie Feuillet, Eric Jacques, Jean-Christophe Komorowski
Summary: In May 2018, an exceptional underwater volcanic eruption offshore Mayotte island in the Indian Ocean led to frequent seismic activity in the region. To better understand and monitor the geological activities in the area, a new network of seismometers and land stations has been deployed since February 2019. Using an improved velocity model and relocation of earthquakes, researchers have identified detailed structures related to the seismic and volcanic activity, providing insights into the fluid pathways and magma reservoirs.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Abigail Metcalfe, Severine Moune, Jean-Christophe Komorowski, Roberto Moretti
Summary: Signals of volcanic unrest have been used successfully to provide insights into the timing, magnitude, intensity, and style of future eruptions. However, analyzing past eruptions is necessary to understand the context for subsequent activity. In this study, the deposits from past eruptions of La Soufriere de Guadeloupe were analyzed to gain understanding of magma processes and explosive eruption styles. The results show that explosive eruption style is controlled by a combination of ascent rate and top-down controls affecting rock strength and stress distribution.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Silvia Massaro, Eduardo Rossi, Laura Sandri, Costanza Bonadonna, Jacopo Selva, Roberto Moretti, Jean-Christophe Komorowski
Summary: The study proposes a probabilistic hazard quantification strategy to assess the impact of volcanic ballistic projectiles (VBPs) based on the variability of eruptive vent locations and wind effects. It shows that topography plays a crucial role in considering the spatial uncertainty of vent locations. The research highlights the importance of a probabilistic approach in estimating the likelihood of VBPs impacts.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Severine Moune, Roberto Moretti, Arnand Burtin, David Edward Jessop, Tristan Didier, Vincent Robert, Magali Bonifacie, Giancarlo Tamburello, J-Christophe. Komorowski, Patrick Allard, Margaux Buscetti
Summary: Fumarolic gas survey is crucial for detecting potential precursors of violent volcanic eruptions, and the data analysis in this study shows that the compositions and fluxes of fumarolic gas emissions are correlated with the evolution of volcanic activity and other parameters. The study also demonstrates that even under tropical conditions with high humidity and rainfall, multi-gas surveys can distinguish signals of volcanic unrest from secondary changes in degassing.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Michael J. Heap, Claire E. Harnett, Fabian B. Wadsworth, H. Albert Gilg, Lucille Carbillet, Marina Rosas-Carbajal, Jean-Christophe Komorowski, Patrick Baud, Valentin R. Troll, Frances M. Deegan, Eoghan P. Holohan, Roberto Moretti
Summary: The tensile strength of volcanic rocks plays a crucial role in understanding volcanic processes and optimizing energy production in volcanic geothermal reservoirs. This study presents an experimental investigation of the tensile strength of variably altered volcanic rocks, revealing that both porosity and alteration significantly affect the tensile strength. The findings suggest that future modelling should consider the tensile strength of hydrothermally altered volcanic rocks.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
M. Henri, X. Quidelleur, A. Le Friant, J. -C. Komorowski, J. Escartin, C. Deplus, C. Mevel
Summary: This study investigates the age of submarine volcanic systems in the Lesser Antilles volcanic arc using radioisotopic dating. The results reveal the ancient volcanic activity and the formation time of volcanic edifices in the area, providing important insights into the formation of volcanic arcs.
Article
Geosciences, Multidisciplinary
Lise Retailleau, Jean-Marie Saurel, Marine Laporte, Aude Lavayssiere, Valerie Ferrazzini, Weiqiang Zhu, Gregory C. Beroza, Claudio Satriano, Jean-Christophe Komorowski
Summary: The seismic crisis off the coast of Mayotte in 2018 indicated the onset of a volcanic eruption. A network of stations was deployed to monitor the volcanic and tectonic activity in the area. This study re-analyzed seismicity using machine learning, identifying a significant number of events. The focus was on lower frequency long period earthquakes, which are believed to be related to fluid movement at depth.
COMPTES RENDUS GEOSCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Michael J. Heap, Valentin R. Troll, Chris Harris, H. Albert Gilg, Roberto Moretti, Marina Rosas-Carbajal, Jean-Christophe Komorowski, Patrick Baud
Summary: This study explores the use of whole-rock delta O-18 and delta D values and water content as metrics to estimate the strength and stiffness of altered volcanic rocks. It finds that delta O-18 values can be used to estimate these parameters and highlights the advantage of this technique in scenarios with limited material.
BULLETIN OF VOLCANOLOGY
(2022)
Article
Geochemistry & Geophysics
Om Prakash Kumar, Amiya S. Naik, P. Gopinathan, T. Subramani, Vishvajeet Singh, Prakash K. Singh, Uma K. Shukla, Arun Prabhu
Summary: This study characterizes lignite samples from Kapurdi, Giral, and Sonari mines in Rajasthan's Barmer Basin using petrographic and geochemical techniques. The results provide insights into the geochemical properties, hydrocarbon potential, depositional environment, and paleo-climatic conditions of these lignite deposits. The study finds high volatile matter and sulfur concentrations in the Barmer lignite deposits, as well as indications of a wet environment during organic material decomposition. The findings have implications for understanding the coalification profile and hydrocarbon source rock potential in the region.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2024)
Review
Geochemistry & Geophysics
Ashkan Jahandari, Behnam Abbasnejad
Summary: The assessment of heavy metal concentrations in agricultural soil is important for crop safety and quality, as well as potential risks to human health. This review analyzed published data on seven heavy metals in Iranian farmland soils and found that nickel and cadmium exceeded permissible levels. Arsenic showed significant contamination in multiple provinces, while lead and cadmium were highly contaminated in Fars province. Overall, the contamination levels of heavy metals in Iranian agricultural soils were relatively low.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2024)
Article
Geochemistry & Geophysics
Imran Ud Din, Said Muhammad, Shah Faisal, Inayat ur Rehman, Wajid Ali
Summary: The presence of heavy metal contamination in coal mines and surrounding environments in the Hangu and Kurram districts poses potential risks to the environment and human health.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2024)
Article
Geochemistry & Geophysics
Douglas Almeida Silveira, Paola Ferreira Barbosa, Cassiano Costa e Castro, Guilherme Ferreira da Silva, Joseneusa Brilhante Rodrigues
Summary: This study analyzed apatite grains from the Angico dos Dias Carbonatite Complex region in Brazil using an electron probe microanalyzer. The results showed that the apatite grains had characteristics of metacarbonatitic lithotypes and some had undergone substitution processes. Statistical analysis helped identify the sources of the apatite grains and confirmed the presence of carbonatitic bodies in the area.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2024)