Article
Geology
C. A. Partin, Y. M. DeWolfe, T. Magee
Summary: This study aims to understand the origin of sediment-hosted Pb-Zn mineralization in the Marmorilik and Qaarsukassak formations through petrographic analysis and various isotope analyses, revealing a Paleoproterozoic age for both mineralizing events. The Marmorilik Formation is most consistent with a Mississippi Valley-type deposit model, while the Qaarsukassak Formation is most consistent with a sedimentary exhalative mineralization model. Results also show that the Marmorilik mineralization represents the oldest documented MVT deposit outside of the Neoarchean-Paleoproterozoic Transvaal basin in South Africa.
ORE GEOLOGY REVIEWS
(2021)
Article
Geology
Wenbin Jia, Da Wang, Yongsheng Li, Xiaofei Yu, Meng Dai, Guangsheng Yan
Summary: This article investigates the formation of the Huoshaoyun carbonate-hosted non-sulfide Zn-Pb deposit in the Karakoram area, northwest China. The study reveals that the mineral composition and isotopic characteristics of the deposit are influenced by sedimentary strata and atmospheric precipitation, and the sulfur is derived from low-temperature bacterial reduction of evaporative sulfate. Additionally, the lead isotopic composition of the deposit indicates a regional origin and suggests a new non-sulfide deposit type in China.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Wen-Dong Zhang, Bin Li, An-Huai Lu, Safiyanu Muhammad Elatikpo, Hui Chen, Xiao-Dong Chen
Summary: The Huayuan Zn-Pb orefield in the southeastern Yangtze Craton is an important mineral resource area, containing several large Lower Cambrian carbonate-hosted deposits. The ore-forming processes in this area are complex and mainly resulted from fluid mixing. The mineralization occurred in three stages, forming different types of ores. The Limei and Danaopo deposits in the Huayuan orefield exhibit similar characteristics to typical MVT ores.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Jean Milot, Chloe Malod-Dognin, Janne Blichert-Toft, Philippe Telouk, Francis Albarede
Summary: The combination of Pb and Ag isotopes can help identify ancient metal sources and detect alteration in silver coins, artefacts, and ores. New procedures have been proposed for high-precision analysis of lead and silver isotopes in Ag-bearing ores and ancient silver coins, with extraction and purification protocols based on ion-exchange and chromatography. The study used MC-ICP-MS to measure the isotopic compositions of both Pb and Ag in ores and coins, revealing uncorrelated variations in Pb and Ag isotopic compositions and indicating different processes behind isotope variability.
Review
Geology
Lidan Tian, Yucai Song, Liangliang Zhuang, Zengqian Hou, Weirong Tian, Xiaohu Wang, Gang Huang, Wei Wu
Summary: This study reviews the characteristics and genesis of reservoirs for MVT ores in the Upper Yangtze block, indicating that reservoir dolostones deposited in a sabkha environment and the breccias mainly resulted from evaporite dissolution. Multistage dolomitization and silicification intensively superimposed on the reservoir horizons provide predominant spaces for Zn and Pb sulfide precipitation.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Tao Wu, Zhilong Huang, Yufan He, Mu Yang, Haifeng Fan, Chen Wei, Lin Ye, Yusi Hu, Zhenzhong Xiang, Chunkit Lai
Summary: The study of the Maoping carbonate-hosted Pb-Zn deposit in the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province revealed a thorough mixing of Pb sources from Devonian-Carboniferous ore-hosting carbonate wallrocks and Neoproterozoic clastic and metamorphic rocks. The deposit is classified as MVT type, with sulfide precipitation in structural traps caused by binary mixing of metal-bearing and reduced S-bearing fluids.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Tao Wu, Yufan He, Zhiwei He, Zhilong Huang, Lin Ye, Chen Wei, Haifeng Fan, Yusi Hu, Lin Du, Minshan Gun
Summary: Understanding the metal sources of Zn-Pb deposits is crucial to comprehend their genetic types and ore-forming processes. The Sichuan-Yunnan-Guizhou metallogenic province is home to abundant Zn-Pb deposits that contain critical metals such as Ga, Ge, Cd, and Tl. However, the origins of these critical metals and the main metal Zn remain unclear. By studying the Liangyan Cd-rich Zn-Pb deposit in this province, it was found that Zn is mainly sourced from the Neoproterozoic basement and Cd is primarily derived from the Carboniferous wallrocks.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Mahsa Hajihosseinlou, Abbas Maghsoudi, Reza Ghezelbash
Summary: The article introduces a lightweight gradient boosting machine (LightGBM) algorithm, which improves the efficiency of gradient boosting decision trees for large feature dimensions and data capacities. It was applied to construct a Pb-Zn prospectivity model for the Varcheh district in western Iran.
NATURAL RESOURCES RESEARCH
(2023)
Article
Multidisciplinary Sciences
Christina Ifrim, Wolfgang Stinnesbeck, Arturo H. Gonzalez Gonzalez, Nils Schorndorf, Andrew S. Gale
Summary: The study revises the historical specimens and documents new material of the world's largest ammonite, Parapuzosia. The analysis provides insight into the ontogeny of Parapuzosia and the evolution of this species from its potential ancestor. The findings suggest a possible monocyclic reproduction strategy in this giant cephalopod.
Article
Engineering, Chemical
Molly R. Radwany, Isabel F. Barton
Summary: This article explores the geometallurgy and process mineralogy of sandstone-hosted ore deposits in the Paradox Basin in the United States. Despite their importance as major resources of uranium and vanadium, these deposits have received little study. The study reveals that uranium is mainly locked within insoluble minerals, while poor solubility of vanadium-rich phyllosilicates is the main barrier to optimal recovery. This research has implications for the recovery of vanadium from other ore deposit types as well.
MINERALS ENGINEERING
(2022)
Review
Geochemistry & Geophysics
Chunfang Cai, Hongxia Li, Kaikai Li, Daowei Wang
Summary: Thermochemical sulfate reduction (TSR) is a redox reaction that occurs between organic matter and sulfates at temperatures above 120 degrees C. It takes place in various environments, including buried rocks, metal deposits, and early oceans on Earth and Mars. This reaction can be dominated by methane and heavy hydrocarbons, and is likely initiated by H2S and labile organosulfur compounds. TSR results in the formation of carbon dioxide and various organic sulfur and non-sulfur compounds. It also produces different sulfur-bearing compounds, such as dibenzothiophenes and thiadiamondoids, as well as significant sulfur isotope fractionation. This process has important implications for metal deposits and the potential for past and ongoing TSR on Mars.
Article
Geochemistry & Geophysics
Ronald J. R. Massawe, David R. Lentz
Summary: The copper-silver skarn occurrences in the McKenzie Gulch area are spatially associated with Middle Devonian intermediate to felsic dyke swarms. The mineralization formed from high temperature and salinity fluids during the prograde stage and lower temperature and salinity fluids during the retrograde stage. The mineralization events coincided with Early to Middle Devonian magmatic activity, as evidenced by felsic porphyry dykes and Pb isotope compositions of sulfides.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Article
Geochemistry & Geophysics
Saulo B. de Oliveira, Craig A. Johnson, Caetano Juliani, Lena V. S. Monteiro, David L. Leach, Marianna G. N. Caran
Summary: The Shalipayco Zn-Pb deposit in central Peru consists of stratabound orebodies, mainly sphalerite and galena, formed in the Upper Triassic Chambara Formation. Geological modeling has divided the Chambara Formation into four members, enhancing understanding of lithological controls on sulfide formation. The replacement of evaporite minerals by organic matter likely generated H2S accumulation, preparing the ground for the Zn-Pb mineralizing event.
MINERALIUM DEPOSITA
(2021)
Article
Geology
Li XiangCai, Wang JingBin, Zhu XinYou, Li ChengHou, Wu JinJian, Wang YongBin, Shi Min, Guo YuHang
Summary: In this study, the mineralization processes of the Jinding Pb-Zn deposit in Yunnan, China were investigated through field geological investigation and LA-(MC) ICP-MS trace element and S-Pb isotope microanalysis. The mineralization of the deposit can be divided into two main stages, with different mineral assemblages and structural characteristics. The ore-forming fluids are believed to be related to the basin brine and H2S-rich fluids in the early stage, as well as the mixing of meteoric water in the late stage. The sedimentary strata of the basin also contribute to the metal content of the deposit.
ACTA PETROLOGICA SINICA
(2023)
Article
Geochemistry & Geophysics
Bradley Cave, Richard Lilly, Peter Rea
Summary: This study combines petrology with in situ monazite U-Pb geochronology to determine the age of hydrothermal and tectonic events experienced by the Mount Isa Cu (+/- Zn-Pb-Ag) deposit. The formation ages of monazite in samples associated with premineralization alteration and Cu mineralization are determined to be 1587 +/- 43 Ma and 1623 +/- 25 Ma, respectively. The age of ca. 1360 Ma is inferred as the minimum age of Cu mineralization based on monazite enveloping chalcopyrite.
Article
Environmental Sciences
A. Husic, J. Fox, E. Adams, J. Backus, E. Pollock, W. Ford, C. Agouridis
ENVIRONMENTAL EARTH SCIENCES
(2019)
Article
Soil Science
Johan Desrochers, Kristofor R. Brye, Edward Gbur, Erik D. Pollock, Mary C. Savin
Article
Geosciences, Multidisciplinary
Bryan Bottoms, Adriana Potra, John R. Samuelsen, Stephen R. Schutter
Article
Geology
Christophe W. Simbo, Adriana Potra, John R. Samuelsen
ORE GEOLOGY REVIEWS
(2019)
Article
Anthropology
John R. Samuelsen, Adriana Potra
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2020)
Article
Engineering, Environmental
Admin Husic, James Fox, Ethan Adams, Erik Pollock, William Ford, Carmen Agouridis, Jason Backus
Article
Soil Science
Johan Desrochers, Kristofor R. Brye, Edward Gbur, Erik D. Pollock, Mary C. Savin
Article
Environmental Sciences
Admin Husic, James Fox, Tyler Mahoney, Morgan Gerlitz, Erik Pollock, Jason Backus
WATER RESOURCES RESEARCH
(2020)
Article
Environmental Sciences
Admin Husic, James Fox, Nabil Al Aamery, William Ford, Erik Pollock, Jason Backus
Summary: Nitrogen removal rates in karst environments are influenced by various factors and processes, such as mineralization and sorption of nitrates. The study highlights the complexities of nitrogen dynamics within karst conduits, with removal processes mainly occurring near conduit entrances and showing higher efficiency during the dry season.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Education, Scientific Disciplines
Amanda N. Scholes, Erik D. Pollock, Jeffrey A. Lewis
Summary: Microbial fermentation is widely utilized in industrial production and plays an important role in food production and brewing. Students can compare the different characteristics of wild yeast and commercial yeast through laboratory experiments, while learning related concepts in molecular ecology and genetics.
JOURNAL OF MICROBIOLOGY & BIOLOGY EDUCATION
(2021)
Article
Environmental Sciences
Brenden Riddle, Jimmy Fox, David Tyler Mahoney, William Ford, Yi-Tin Wang, Erik Pollock, Jason Backus
Summary: This study investigates the use of carbon and nitrogen stable isotopic ratios in sediment fingerprinting studies. The results show that certain processes and considerations can significantly impact the isotopic ratios, while others have no significant effect. It is recommended to consider tracer conservativeness and concentration dependent mixing in fingerprinting simulations, as well as account for the loss of organic matter and algae accrual in sediment deposits. Both carbon and nitrogen isotopic ratios are suggested as potential tracers in future studies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Anthropology
John R. Samuelsen, Adriana Potra
Summary: Skull burials around the world have been interpreted as foreigners, sacrifices, or victims of warfare. The cause of ancient Native American skull deposits, specifically in southwest Arkansas, has sparked debate among scholars. This study used a new method, the biologically available Pb method, to determine the geographic origins of the remains and concluded that the skulls and mandibles were local to southwest Arkansas.
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2023)
Article
Agronomy
Johan Desrochers, Kristofor R. Brye, Erik D. Pollock
Summary: Long-term traditional and alternative agricultural management practices, as well as different treatment combinations, have significant effects on carbon and nitrogen cycling and storage in soil. Isotopic analysis can reveal these effects. The study shows that long-term residue and water management practices can alter the isotopic composition of particulate organic matter and light fractions in soil, which may not be apparent from simple bulk soil analysis or short-term field studies.
AGROSYSTEMS GEOSCIENCES & ENVIRONMENT
(2022)
Article
Engineering, Environmental
Mojtaba Abolhassani, Alexis Wells Carpenter, Danilo Meyer-Arrivillaga, Erik David Pollock, Yukiko Moriizumi, Prashant Acharya, Sergio I. Perez Bakovic, Lauren F. Greenlee
Summary: This study investigates the impact of different carbon powders on the removal and transport properties of TCE, finding that certain properties of carbon do not affect TCE degradation while surface area, pore size, and functional groups are crucial for TCE adsorption. Smaller carbon particle size leads to a wider radius of influence when transporting the composite through porous media, indicating the potential for using carbon supports to enhance dehalogenation reactions and increase the longevity of NZVI.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Jonathan Chick, Sydney E. McKim, Adriana Potra, Walter L. Manger, John R. Samuelsen
Summary: Research on Southern Ozark Mississippi Valley-type ores reveals enrichment in radiogenic lead sourced from two distinct components. Analysis indicates that diagenetic processes have influenced the sampled lithologies, but the exact source of the more radiogenic component remains unidentified.
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)