Article
Multidisciplinary Sciences
Yanlu Xing, Joel Brugger, Barbara Etschmann, Andrew G. Tomkins, Andrew J. Frierdich, Xiya Fang
Summary: The presence of trace amounts of dissolved cerium is shown experimentally to increase the porosity of hematite formed via fluid-induced replacement of magnetite, enhancing efficiency of magnetite replacement, fluid flow, and element mass transfer. Cerium acts as a catalyst affecting the nucleation and growth of hematite, ultimately controlling the kinetics, texture, and composition of fluid-mineral systems. This study provides new insights into how trace elements like cerium can precondition ore systems for enhanced metal accumulation, contributing to the large size and metal endowment of world-class ore deposits.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Avishek Rudra, Elizabeth Cottrell, Marc M. Hirschmann
Summary: This study investigated the partitioning of Fe3+ between pyroxene and melt under controlled oxygen fugacity conditions, revealing variations in Fe3+ content in different types of pyroxenes at different f(o2) levels. XANES measurements showed that Fe3+/Fe-T values in pyroxene crystals produced in the experiments were lower compared to natural peridotitic pyroxenes, potentially due to lower Al-3(+) contents. Thermodynamic models were found to over-predict the stability of Fe3+ in pyroxenes, leading to underestimation of f(o2) in spinel peridotites during basalt genesis.
Article
Environmental Sciences
Jin-li Cui, Jinsu Yang, Yanping Zhao, Tingshan Chan, Tangfu Xiao, Daniel C. W. Tsang
Summary: Understanding the distribution and speciation of arsenic (As) associated with iron (Fe) in subsoil profiles is important for predicting the immobilization of high geogenic As and safe utilization of As-containing soil during land development. This study investigated the As enrichment mechanisms in four subsoil cores from Hong Kong using sequential chemical extraction and X-ray absorption near edge spectroscopy. The results showed that the subsoil profiles had relatively high concentrations of As, mainly in the form of As(V) associated with the residual fraction. Poorly crystalline Fe (oxyhydr)oxides played a key role in immobilizing most of the high geogenic As.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geochemistry & Geophysics
Sean Hoffman, Matthew Jason Mayne, Gary Stevens
Summary: This paper presents the integration of trace element partitioning routines and accessory phase saturation routines in the thermodynamic modelling tool Rcrust to effectively estimate the trace element composition of stable phases and provide constraints on the formation and crystallisation of crustal magmas. A case study of the Peninsula Pluton granodiorite is used to validate the method and the results have implications on geothermobarometry and thermochronology in the crust.
Article
Geochemistry & Geophysics
Xueni Zhang, Bryan J. Maciag, James M. Brenan, James E. Mungall
Summary: Past experiments mainly focused on the roles of olivine and chromite in controlling the behavior of the platinum-group elements (PGE) during melting and solidification, while other phases like pyroxene were less characterized. This study conducted experiments to measure the partitioning of Pd between orthopyroxene and silicate melt, revealing changes in Pd solubility with varying redox conditions and a higher compatibility of Ir compared to Pd.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Review
Public, Environmental & Occupational Health
Kyi Mar Wai, Thinzar Swe, Maw Thoe Myar, Cindy Rahman Aisyah, Thae Su Su Hninn
Summary: This manuscript summarizes and discusses the alteration of telomere length following arsenic exposure and the possible dose-response effect of arsenic on telomere length. The findings suggest that different age groups may respond differently to arsenic exposure, and the dose-response effect of arsenic could be a critical factor in its effect on telomere length. Moreover, speciation analysis of arsenic could be more informative in identifying the effect of arsenic on telomere length.
FRONTIERS IN PUBLIC HEALTH
(2023)
Article
Geochemistry & Geophysics
Jue Lu, Wei Chen, Yuancan Ying, Shaoyong Jiang, Kuidong Zhao
Summary: This study examined the textural and chemical variations of apatite in three carbonatite-related REE deposits, revealing different apatite textures with distinct trace element compositions. Magmatic apatite has high Mn and Sr concentrations, with a steep REE chondrite-normalised pattern; metasomatic apatite has lower Mn and Sr concentrations, with variable REE trends; hydrothermal apatite has convex upward REE distributions, with the lowest Mn and Sr concentrations.
Article
Geochemistry & Geophysics
I. T. Burke, R. Courtney, W. M. Mayes
Summary: Careful management is required for the high-volume, fine grained tailings from Pb/Zn ore processing. The presence of metalloid elements As and Sb in tailings and leachates can cause regulatory concern due to their toxicity and bioaccumulation potential. The mobility of As and Sb in tailings is controlled by their chemical speciation and associations with mineral phases. By establishing a vegetation cover and promoting oxidation of the tailings, beneficial vegetation cover and a suitable soil-like surface layer can be developed.
APPLIED GEOCHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Masashi Shidare, Ryoichi Nakada, Tomohiro Usui, Minato Tobita, Kenji Shimizu, Yoshio Takahashi, Tetsuya Yokoyama
Summary: The study investigated sulfur speciation in impact glasses of three basaltic shergottites from Mars, revealing that sulfate minerals in EETA79001 and LAR 06319 likely originated from the reduced igneous host rock on Mars, while sulfate in Dhofar 019 was more likely from terrestrial alteration. The findings suggest that ancient Martian water reservoirs may have already been oxic, leading to the formation of sulfate minerals through water-rock interactions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Agriculture, Dairy & Animal Science
Mutassim M. Abdelrahman, Ibrahim A. Alhidary, Riyadh S. Aljumaah, Bernard Faye
Summary: Trace elements are essential for all species and their deficiency or excess can have important consequences for metabolism and health. This paper investigates the trace element status of camels, particularly focusing on copper, zinc, iron, selenium, manganese, cobalt, iodine, fluorine, molybdenum, sulfur, bromide, and nickel in camel blood samples. It also discusses the symptoms associated with deficiency or excess of these trace elements and highlights the specificities of trace elements in camels.
Article
Environmental Sciences
Matthew Dietrich, John Ayers
Summary: Limited research has been conducted on trace metal(loid) exchange between sediment, water, feed, and shrimp in estuarine aquaculture environments. Shrimp metal(loid) concentrations are mainly influenced by diet rather than pond sediment or pond water. The detection of thallium in shrimp at levels posing significant human health risks warrants further investigation into potential contamination in Bangladesh aquaculture environments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Xuyang Meng, Jackie M. Kleinsasser, Jeremy P. Richards, Simon R. Tapster, Pedro J. Jugo, Adam C. Simon, Daniel J. Kontak, Laurence Robb, Grant M. Bybee, Jeffrey H. Marsh, Richard A. Stern
Summary: The study indicates that moderately oxidized, sulfur-rich arc magmas associated with porphyry Cu mineralization already existed in the late Paleoproterozoic, possibly due to the recycling of sulfate-rich seawater or sediments at that time.
NATURE COMMUNICATIONS
(2021)
Review
Energy & Fuels
Barbara J. Arnold
Summary: With the increasing focus on recovering critical elements from various coal-related sources, evaluating coal preparation technologies for their role in recovery or rejection of these elements is crucial. Past studies on trace element removal from coal, including those considered hazardous air pollutants in the past, need to be reviewed. The mode of occurrence of these elements in coal plays a significant role in their recovery or rejection during coal preparation processes. Future work should consider element partitioning with coal macerals and comprehensive evaluations of hydrometallurgical principles for element recovery.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Zhongwen Bao, Tom Al, Jeff Bain, Heather K. Shrimpton, Y. Zou Finfrock, Carol J. Ptacek, David W. Blowes
Summary: Degraded water quality and environmental impacts caused by weathering of sulfide-bearing mine wastes are a legacy remaining at many historical mine sites. This study investigated sphalerite weathering and controls on Zn and Cd migration in an uncovered mine waste-rock pile. The results showed that sphalerite oxidation leads to congruent dissolution without distinct secondary-mineral coatings, significantly contributing to elevated aqueous concentrations of Zn and Cd. Field-scale observations and mineralogical investigations indicate the common occurrence of Fe-oxyhydroxides in the waste-rock pile, which control the aqueous concentrations of Zn and Cd.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Agriculture, Dairy & Animal Science
Kaili Yang, Shengjun Hu, Rui Mu, Yiqing Qing, Liang Xie, Liyuan Zhou, Kolapo M. Ajuwon, Rejun Fang
Summary: This study investigated the effects of different patterns and sources of trace elements such as zinc, iron, copper, manganese, and selenium on laying hens. It was found that supplementing organic trace minerals promoted optimal laying performance, mineral deposition, and reduced mineral excretion in laying hens.
Article
Geochemistry & Geophysics
Haoxuan Feng, Ping Shen, Rixiang Zhu, Andrew G. Tomkins, Joel Brugger, Ge Ma, Changhao Li, Yang Wu
Summary: The Wulong gold deposit is located in the North China Craton and is associated with bismuth and tellurium minerals. The close association between bismuth and gold suggests that bismuth played a role in gold enrichment.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
Andrew J. Coward, Anja C. Slim, Joel Brugger, Sasha Wilson, Tim Williams, Brad Pillans, Anton Maksimenko
Summary: Zebra rock is a macroscopic rock in the East Kimberly region of Australia, famous for its rhythmic iron-oxide pattern. Different formation mechanisms, including redoximorphic banding and Liesegang banding, have been proposed. This study combines mineralogy, geochemistry, and geological context to confirm the occurrence and timing of acid-sulfate interactions in zebra rock and determine the origin of these patterns. The study provides evidence of simultaneous development of iron-oxide banding and aluminosilicate dissolution, supporting an acidic fluid infiltration. However, the origin and temperature of the fluid could not be conclusively determined. A hydrothermal origin is also supported by mineralogical analysis. Rating: 8/10
Article
Geochemistry & Geophysics
Weihua Liu, Yuan Mei, Barbara Etschmann, Matthew Glenn, Colin M. MacRae, Sam C. Spinks, Chris G. Ryan, Joel Brugger, David J. Paterson
Summary: The incorporation mechanisms of germanium in sphalerite have been investigated through experiments and molecular simulations. It is found that germanium can be incorporated into sphalerite through charge balance or coupled substitution with other metal ions. This study provides insights into the formation and extraction processes of germanium in zinc ores.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Jianping Li, Weihua Liu, Long Su, Dengfeng Li, Shitao Zhang, Huayong Chen
Summary: This study simulated the shallow porphyry copper mineralization process and evaluated the contribution of sulfate reduction to ore formation. The results showed that increasing temperature enhanced the K-silicate alteration and sulfide precipitation. The low-salinity vapor phase had a stronger impact on alteration compared to the liquid phase. The overlap between the K-silicate alteration zone and mineralization triggered by sulfate reduction was controlled by factors such as temperature, vapor formation, and decompression.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Sicheng Wang, James Vaughan, Fang Xia, Barbara Etschmann, Joel Brugger, Helen Brand, Hong Peng
Summary: Zeolite LTA is a significant industrial zeolite, and the synthesis of zeolites using natural resources or manufacturing wastes as raw materials has economic and environmental benefits. However, soluble impurities in these feeds influence the quality of zeolite LTA products, and the effects of different inorganic salts on the phase transformations in zeolite LTA have been studied using in situ synchrotron powder X-ray diffraction.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Geochemistry & Geophysics
Qiushi Guan, Yuan Mei, Weihua Liu, Joel Brugger
Summary: Molybdenum (Mo) is extracted from magmatic-hydrothermal ore deposits, and understanding the thermodynamic properties of aqueous Mo complexes is crucial for predicting Mo transport and deposition in ore-forming environments. However, there is a discrepancy between experimental studies at different temperatures and pressures. This study uses molecular dynamics simulations to reveal the stability of Mo(VI) chloride complexes in high-temperature magmatic-hydrothermal fluids.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Review
Engineering, Environmental
Alexander Kalintsev, Qiushi Guan, Joel Brugger, Artas Migdisov, Barbara Etschmann, Rahul Ram, Weihua Liu, Yuan Mei, Denis Testemale, Hongwu Xu
Summary: The structure of uranyl aqua ion (UO22+) and its inorganic complexes under relevant conditions to U mobility in ore-forming systems and nuclear waste repositories were characterized using X-ray absorption spectroscopy and molecular dynamics calculations. The findings reveal the changes in coordination number of these complexes with temperature and pressure, providing insights into their stability.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Geochemistry & Geophysics
Gan Duan, Alkiviadis Kontonikas-Charos, Rahul Ram, Barbara Etschmann, Timothy Williams, Paul Guagliardo, Joel Brugger
Summary: Fluid-induced mineral reactions play a significant role in controlling the properties of the crust and hydrothermal plumbing systems. This study focuses on the reactions between feldspars and geofluids and investigates the reaction mechanisms and effects of fluorine on the reactions. The results show that the nature of the reaction interface is influenced by both mineral properties and solution chemistry, which directly impacts porosity development, chemical environment, and chemical exchanges.
Article
Geosciences, Multidisciplinary
Jonathan Hamisi, Barbara Etschmann, Andrew Tomkins, Iain Pitcairn, Zsanett Pinter, Adam Wlodek, Laura Morrissey, Steven Micklethwaite, Nicolas Trcera, Stuart Mills, Joel Brugger
Summary: Scapolite is a common mineral that contains S, Cl, and C in metamorphic terranes. It can interact with fluids, leading to albitisation of scapolite and release of volatile components. Scapolite plays an important role in buffering the oxidation state, salinity, and sulfur speciation of rocks and fluids, and can influence hydrothermal mineralisation processes.
Article
Mineralogy
Owen P. Missen, Stuart J. Mills, Joel Brugger, William D. Birch, Peter Elliott
Summary: This study describes a new hydrated magnesium nickel tellurite mineral called Wortupaite, which has a zemannite-like structure. The mineral was discovered in the Wortupa gold mine in Australia and characterized using techniques such as electron probe microanalysis and single-crystal X-ray diffraction.
MINERALOGICAL MAGAZINE
(2023)
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)