Article
Geosciences, Multidisciplinary
Olga Y. Plotinskaya, Bo Zu, Reimar Seltmann, Jens Najorka, Dmitry Bondar, Vera D. Abramova, Chao Li, John Spratt, Olga Bergal-Kuvikas, Elena Belogub
Summary: This study presents and discusses the geological characteristics, trace element geochemistry, and Re-Os dating of molybdenite in various porphyry and greisen deposits. It reveals that the Re contents and distribution in molybdenite are indicative of the tectonic settings of the deposits and the tectonic history of the Urals.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Chadlin M. Ostrander, Sune G. Nielsen, Hayley J. Gadol, Luciana Villarroel, Scott D. Wankel, Tristan J. Horner, Jerzy Blusztajn, Colleen M. Hansel
Summary: Thallium (Tl) isotopes serve as a valuable tool for studying the history of molecular oxygen in seawater. Understanding the modern Tl isotope cycle is crucial for its application, especially in anoxic environments. This study found significant variability in Tl isotopes in short timeframes and observed the association of Tl with sulfide and other metals. The sediment data revealed limited isotopic variability, indicating the ability of sediments to capture the Tl isotope composition of contemporary waters.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Amy K. Wiersma, Glen Hook, Madeleine Mathews, Sean R. Scott, Jessica R. Meyer, Beth L. Parker, Matthew Ginder-Vogel
Summary: Hydrocarbon spills in groundwater can lead to changes in geochemical conditions, potentially releasing geogenic contaminants. This study found that radium activities were up to 10 times higher in an aquifer contaminated with a mixture of chlorinated solvents, ketones, and aromatics. The elevated radium activities were likely due to iron and manganese (hydr)oxide reduction and sorption site competition within the dissolved phase plume. However, within the Fe(III)/SO4 (2-) reducing zone downgradient from the source, radium activities returned to background levels.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Luigi Marinoni, Franca Caucia, Mattia Gilio, Maurizio Scacchetti
Summary: This work investigates the gemological properties of datolite from the Campotrera field in Italy, for possible commercial use. The datolite occurs in multi-centimeter veins with calcite and prehnite in basaltic ophiolites. The gems obtained are mixed or carre cut, colorless or salmon pink, transparent, with a vitreous luster and weight between 1 to 5 carats. They have high brilliance, transparency, and birefringence, with a glassy luster and absence of cleavage. The gems are valuable but fragile, requiring care in cutting and preparation.
Article
Biochemistry & Molecular Biology
Viktoria K. Wandt, Nicola Winkelbeiner, Kristina Lossow, Johannes F. Kopp, Maria Schwarz, Wiebke Alker, Merle M. Nicolai, Luise Simon, Caroline Dietzel, Barbara Hertel, Gabriele Pohl, Franziska Ebert, Lutz Schomburg, Julia Bornhorst, Hajo Haase, Anna P. Kipp, Tanja Schwerdtle
Summary: Trace elements are essential for maintaining body function and health, with their homeostasis regulated by factors such as age and sex. Age-related shifts in trace element concentrations are relatively stable and independent of nutritional supply. Inadequate trace element supply may have inconsistent effects, affecting redox status and DNA repair activity.
Article
Geology
Wang XuDong, Zhao HaiJie, Yu ZhouPing, Zhang TengFei
Summary: The Tongmushan greisen type tin deposit in eastern Hunan is an important deposit within the Xitian tin polymetallic ore field. Through detailed field investigation and experimental studies, it was found that there are significant differences in the composition and formation conditions between cassiterite and intergrowth quartz in the deposit. The quartz veins cutting the ore bodies are likely formed by fluid activity following magmatism and mineralization. Fluids related to tin mineralization are from a NaCl-H2O system, while fluids associated with the formation of quartz are from a carbon containing system.
ACTA PETROLOGICA SINICA
(2021)
Article
Geosciences, Multidisciplinary
Rui-Chang Tan, Yong-Jun Shao, Han-Tao Wei, Jun-Ke Zhang, Meng-Da Yu, Yi-Qu Xiong
Summary: This study determined the major and trace element compositions of the newly-identified apatite from the Pb-Zn ores in the Huayuan orefield. The apatite samples are of hydrothermal origin and have distinct characteristics from typical magmatic and purely hydrothermal apatites. The mixing of ore-forming fluids from different sources may have triggered significant metal ore deposition.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Materials Science, Ceramics
Sarah Wittmann, Mohammad Mangir Murshed, Vitaliy Bilovol, Aylin Koldemir, Rainer Poettgen, Ulla Gro Nielsen, Thorsten Michael Gesing
Summary: Metal tin-(II)-borates are rarely studied, and we report the synthesis and characterization of SnAlBO4 and SnGaBO4 ceramics. The crystal structure, chemical properties, and optical characteristics were analyzed and explained using various testing methods.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Julian Hackler, Kamil Demircan, Thilo Samson Chillon, Qian Sun, Nino Geisler, Michael Schupp, Kostja Renko, Lutz Schomburg
Summary: Selenium is an essential trace element that affects the expression of SELENOP. A drug screening was performed to identify inhibitors of SELENOP expression, and resveratrol was found to be the most potent inhibitor. The results suggest that resveratrol may increase liver Se levels and selenoprotein expression.
Article
Environmental Sciences
Paula Renata Muniz Araujo, Caroline Miranda Biondi, Clistenes Williams Araujo do Nascimento, Fernando Bruno Vieira da Silva, Tiago Osorio Ferreira, Silvia Fernanda de Alcantara
Summary: Heavy metal-contaminated wastes pose a threat to the biodiverse mangrove forests. A study in Botafogo estuary, Brazil, evaluated the distribution of heavy metals in soils, ecological and human health risks, and metal contents in soil fractions and mangrove organisms. The study found that metal concentrations exceeded background levels, but were deemed safe for the environment and human beings.
MARINE POLLUTION BULLETIN
(2022)
Article
Geochemistry & Geophysics
Kristian Drivenes
Summary: Multiple generations and growth stages of tourmaline from a hydrothermal quartz-tourmaline rock in SW England were analyzed to understand the variation in tourmaline composition and specifically the distribution of Sn. The study demonstrated the suitability of quantitative X-ray mapping for identifying and quantifying minor elements.
JOURNAL OF GEOSCIENCES
(2022)
Article
Geography, Physical
Guangyao Cao, Yu Liu, Chao Li, Ping'an Peng, Mingcai Hou, Gary G. Lash, Xiaolin Zhou, Yuanchun Li, Ying Song
Summary: The Ordovician-Silurian transition is a critical geological period marked by significant climatic, environmental, and biological changes. This study examines the paleosalinity conditions of the inner Yangtze Sea during this period and finds that salinity variations are influenced by climate changes, particularly lower salinity during glacial intervals. These salinity perturbations are also linked to the development of euxinia in the inner Yangtze Sea, highlighting the importance of seawater salinity in driving evolutionary patterns during this critical period in Earth history.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geography, Physical
Yamin Yu, Pingping Li, Ruixin Guo, Yizhen Zhao, Shan Li, Huayao Zou
Summary: This study reveals the vertical variation in organic matter enrichment of the Upper Permian Dalong Formation in the northern Sichuan Basin, which was related to the expansion of the Paleo-Tethys Ocean induced transgression and upwelling in the northern continental margin of the Upper Yangtze. The differences in types and strength of the upwelling result in the variation of paleoproductivity and redox conditions, and thus the organic matter abundance in the sedimentary rocks.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geochemistry & Geophysics
Nicolas Meyer, Gregor Markl, Axel Gerdes, Jens Gutzmer, Mathias Burisch
Summary: This contribution provides new insights into the origin and age relationships of the Geyer tin deposit in Germany. Tin mineralization is found in skarns, greisen, and cassiterite-bearing fluorite-quartz veins. The ages of different stages of skarn alteration and cassiterite vein formation suggest that the tin mineralization is related to a younger magmatic-hydrothermal event. Fluid inclusions analysis indicates that dilution of high-salinity fluids with low-salinity fluids and cooling of the system played an important role in the precipitation of cassiterite in the Geyer Sn system.
MINERALIUM DEPOSITA
(2023)
Article
Multidisciplinary Sciences
Farshad Nejadsattari, Zbigniew M. Stadnik
Summary: The electronic, magnetic and hyperfine-interaction properties of the 112-type iron-pnictide compound EuFeAs2 have been investigated using density-functional theory. The band structure is similar to other 112-type compounds, originating mainly from Fe atoms, with a mixture of ionic and covalent bonding predicted. There is good agreement between calculated hyperfine-interaction parameters and experimental results.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Lillian R. Lueck, Mark P. Fischer, Nicholas J. Williams, Kerstin Drost, Justin P. Dodd, David M. Chew
Summary: This study combines field structural analysis with various methods to investigate the evolution and complexity of the paleofluid system in the vicinity of the Gypsum Valley salt wall in the Paradox Basin, U.S.A. The results highlight the need for careful integration of stratigraphic and structural data for interpreting fluid systems in salt structures.
Article
Geosciences, Multidisciplinary
G. Zulauf, J. Zulauf, J. Linckens, A. Gerdes, E. Hattingen, F. Loeckle, H. R. Marschall, L. Steckenreiter
Summary: In this study, structural, microfabric, and strain data of a spessartite sill and its quartzmonzodiorite host affected by bulk constrictions were presented. The results showed that the constrictional deformation led to various changes in the sill, including prolate grain-shape fabrics, increased dip, doubled thickness, mullions with cusps pointing into the host, and boudinage of felsic veins. The sigmoidal shape of the foliation/lineation within the sill was attributed to sill rotation, which induced shear stresses and resulted in antithetic rotation of the grain-shape fabric. The shape of the mullions, the boudinage of the felsic veins, and the sigmoidal foliation/lineation indicated an inversion in rheology, with the mafic sill being incompetent while the felsic host and veins being competent. This inversion could be explained by more effective phase-boundary diffusion in the fine grained mafic sill.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Multidisciplinary Sciences
David Bekaert, Maureen Auro, Quinn R. Shollenberger, Ming-Chang Liu, Horst Marschall, Kevin W. Burton, Benjamin Jacobsen, Gregory A. Brennecka, Glenn J. McPherson, Richard von Mutius, Adam Sarafian, Sune G. Nielsen
Summary: Calcium-aluminum-rich inclusions in meteorites provide important information about the early Solar System environment. Variations in vanadium and strontium isotopes in CAIs suggest that kinetic isotope effects during condensation and evaporation can explain anomalies previously attributed to solar particle irradiation. Researchers also found initial excesses of Be-10 and argue that CAIs likely formed at greater heliocentric distances than previously thought.
Article
Geochemistry & Geophysics
J. Xu, G. B. Zhang, H. R. Marschall, J. B. Walters, S. Q. Liu, Z. Lu, L. F. Zhang, H. Hu, N. Li
Summary: The boron geochemistry of white micas and tourmaline in metamorphic rocks provides important insights into fluid-rock interaction and mass transfer processes in subduction zones. The study presents data on boron concentration and isotopic composition of these minerals in an ultra-high pressure metapelitic schist from Xinjiang Province, China. The results indicate the effects of dehydration and rehydration processes during the metamorphic evolution.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
E. A. Codillo, F. Klein, B. Dragovic, H. R. Marschall, E. Baxter, M. Scambelluri, E. Schwarzenbach
Summary: Exhumed metasomatic reaction zones between mafic and ultramafic rocks from subduction zones provide insights into high-pressure mass-transfer processes. However, distinguishing them from inherited oceanic signatures is crucial for interpreting the rock record accurately. This study integrated various constraints to understand the formation of reaction zones between metagabbro and serpentinite, suggesting widespread metasomatism of mafic rocks by Mg-rich fluids and limited talc formation in subduction zones.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Sadrack Felix Toteu, Maarten de Wit, Joseph Penaye, Kerstin Drost, Jennifer Alice Tait, Merlain Houketchang Bouyo, William Randall Van Schmus, Hielke Jelsma, Gaetan Rock Moloto-A-Kenguemba, Adejardo Francisco da Silva Filho, Catherine Lerouge, Moctar Doucoure
Summary: The study clarifies relationships between different blocks within the Central African Fold Belt and reveals the geological evolution of each block.
Article
Geosciences, Multidisciplinary
E. A. Codillo, F. Klein, H. R. Marschall
Summary: The research used thermodynamic reaction-path models to evaluate the conditions of talc formation, finding that talc formation at the slab-mantle interface is restricted to specific pressure-temperature conditions and fluid compositions. In contrast, chlorite formation is predicted to be ubiquitous under relevant conditions at subduction zone interfaces, with chlorite abundance and talc scarcity evident in the rock record.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Miles Lindner, Dominik C. Hezel, Axel Gerdes, Horst R. Marschall, Frank E. Brenker
Summary: This study focuses on the analysis of the Si-rich mesostasis in Martian shergottite NWA 6963 using laser ablation multicollector inductively coupled plasma mass spectrometry U-Pb measurements. The results indicate that the Si-rich mesostasis represents a late-stage differentiated melt produced in the final phase of the magmatic history, rather than a shock melt.
METEORITICS & PLANETARY SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Thomas Gyomlai, Philippe Agard, Horst R. R. Marschall, Laurent Jolivet
Summary: This study uses in-situ Rb/Sr dating on rocks from the Kampos-Lia unit in Syros, Greece to determine the timing of metasomatic events. The main metasomatic event occurred around 36 Ma ago, coinciding with the transition from blueschist to greenschist facies and tectonic exhumation in the Cyclades. The results highlight that fluid-rock interaction along the subduction interface is not continuous, but rather occurs in punctuated, heterogeneously distributed events tied to specific tectonometamorphic episodes.
Editorial Material
Geosciences, Multidisciplinary
W. P. Leeman, S. Agostini, J. D. Barnes, H. -y. Li, H. R. Marschall, J. G. Ryan
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
V. Monchal, K. Drost, D. Chew
Summary: The Variscan orogeny in southern Ireland and Britain is characterized by intense folding and thrusting. Late Eocene fold reactivation was detected in calcite veins, which suggests N-directed shortening associated with the Alpine/Pyrenean orogenies. This reactivation has not been recognized previously due to the lack of post-Variscan markers. The imaging approach to LA-ICP-MS U-Pb dating helped identify age-homogeneous domains and revealed the late Eocene fold reactivation.
Article
Geosciences, Multidisciplinary
G. Zulauf, J. Linckens, A. Beranoaguirre, A. Gerdes, J. Krahl, H. R. Marschall, L. J. Millonig, N. Neuwirth, R. Petschick, P. Xypolias
Summary: The zircon dating of rocks from the Uppermost Unit of Crete indicates ages of Triassic period, ranging from 237.3 Ma to 242.1 Ma. These rocks, formed in a marine environment, underwent a skarn formation process that lasted for over 20 million years. Based on the results, it is likely that these rocks are derived from the peri-Rhodope domain of the Internal Hellenides or the Pontides of northern Turkey.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Multidisciplinary Sciences
Ase Hestnes, Kerstin Drost, Tor O. O. Somme, Deta Gasser, Thomas Scheiber, Henriette Linge, David Chew, Joachim Jacobs
Summary: We utilized U-Pb calcite dating to investigate structurally-controlled fracture fills in the Caledonian basement of western Norway, revealing subtle large-scale tectonic events that impacted this rifted continental margin. The ages can be grouped into four distinct categories, ranging from the latest Cretaceous to Pleistocene. These ages provide insights into the faulting history, lithospheric stretching, far-field effects related to the proto-Iceland mantle plume, and long-lived Cenozoic deformation history of the uplifted continental margin. Overall, our findings demonstrate a larger extent of far-field tectonic stresses and ongoing deformation in the late Cenozoic than previously thought.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Francesco Arboit, Kerstin Drost, Alessandro Decarlis, David Chew, Dominik Hennhoefer, Andrea Ceriani
Summary: The Cenozoic succession of the Jabal Hafeet anticline provides a complete surface expression of the deformation in the Southeast Arabian Foreland Basin. The core of the anticline consists of Eocene Rus Formation carbonate rocks with fractures and carbonate veins associated with dynamic fracture opening and sealing events. These fractures developed due to the propagation of compressional stresses from the Makran and Zagros fold-and-thrust belts into the SEAFB and are linked to Arabia-Eurasia convergence.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Emmanuel A. Codillo, Veronique Le Roux, Benjamin Klein, Mark D. Behn, Horst R. Marschall, Gray E. Bebout
Summary: Mélange rocks, which are mixtures of subducted materials and serpentinized mantle rocks, may ascend from the slab-top into the overlying mantle and influence the compositional characteristics of arc magmas. This study performed experiments on natural mélange rocks to investigate their melting behavior and buoyancy. The results show that melting of mélange rocks is unlikely to occur along the slab-top, and diapirism into the hotter mantle wedge is required for melting to initiate. The study also evaluates the accuracy of thermodynamic modeling in reproducing the phase equilibria and density evolution of mélange compositions, highlighting the need for an improved thermodynamic database. This research provides experimental constraints on mélange buoyancy and has implications for understanding subduction zone processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
