Article
Geochemistry & Geophysics
Ding-Sheng Jiang, Saskia Erdmann, Geng-Xin Deng, Hai-Hao Guo, Fei Wu, Xi-Sheng Xu, Hang Xu, Zi-Fu Zhao, Fang Huang
Summary: This study reveals the petrogenesis of peralkaline granitic rocks in the Zhoushan area. The Ba isotopic compositions of these rocks indicate the influence of fluid fluxing and re-melting of garnet-bearing crustal source during their formation.
Article
Geosciences, Multidisciplinary
Chadlin M. Ostrander, Brian Kendall, Gwyneth W. Gordon, Sune G. Nielsen, Wang Zheng, Ariel D. Anbar
Summary: This study presents evidence of molecular oxygen accumulation during the late Archean period, shedding light on the extent and distribution of O-2 at Earth's surface. The findings suggest that O-2 in the atmosphere could have been homogeneously distributed at low levels or accumulated near sites of O-2 production. The penetration of O-2 in marine sediments was minimal, indicating limited burial of manganese oxide minerals.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Joshua Munro, Chris Harris
Summary: The 2060 +/- 2 Ma Phalaborwa Complex is a pipe-like intrusion formed from multiple magma pulses. It is composed of a main pipe made up of various rock types, surrounded by smaller plugs. The delta O-18 values for most minerals are consistent with magmatic equilibrium, while alkali feldspar and phlogopite show more variability. The high-delta O-18 values suggest a mantle source for the magmas.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Chadlin M. Ostrander, Silke Severmann, Gwyneth W. Gordon, Brian Kendall, Timothy W. Lyons, Wang Zheng, Moutusi Roy, Ariel D. Anbar
Summary: Research indicates that sedimentary rocks and minerals formed during the late Archean Eon contain lower levels of Fe-56 compared to other periods, possibly due to factors such as very negative seawater delta Fe-56 values, shuttling of light Fe isotopes in redox-stratified environments, and pyrite formation in Fe(II)-rich oceans. These processes, along with evidence of Fe shuttle and pyrite formation, likely played a role in driving strong 56Fe depletions. The connection between severe Fe-56 depletions and distant euxinic settings suggests a persistent presence of a very negative global seawater delta Fe-56 value during the latest Archean, supporting the idea of a prolonged initial oxidation process on Earth.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Jordan A. McDivitt, Daniel J. Kontak, Bruno Lafrance, Joseph A. Petrus, Mostafa Fayek
Summary: By tracking mineralized shear zones in orebodies and analyzing trace metal, sulfur isotope, and oxygen isotope data in pyrite, this study reveals the nature and genesis of different gold events, providing important clues for understanding Archean gold deposits.
MINERALIUM DEPOSITA
(2021)
Article
Environmental Sciences
Keryn Roberts, Michael Grace, Perran Cook, Dirk Erler, Wei Wen Wong
Summary: The effectiveness of nitrogen removal in wetlands depends on biological processes. Isotopic fractionation factors were measured to evaluate nitrogen transformation processes in two urban water treatment wetlands. Differences in sampling conditions, such as rainfall patterns and light availability, affected the removal capability of the wetlands. Nitrate removal was influenced by overall nutrient inputs, residence time, and water temperature.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Reyes Gimenez, Miguel Bartolome, Fernando Gazquez, Miguel Iglesias, Ana Moreno
Summary: Studies on rainfall isotopic composition in the Iberian Peninsula are limited, with few providing analyses on triple oxygen isotopes. This research in the Central South Pyrenees of Spain found that temperature variations play a key role in controlling isotopic composition, along with the influence of moisture sources and airflow trajectories.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Multidisciplinary Sciences
Daniel Herwartz, Andreas Pack, Thorsten J. Nagel
Summary: Research suggests that high CO2 sequestration fluxes into the oceanic crust lowered the oxygen isotope ratios of seawater on early Earth, leading to the formation of ancient chemical sediments. These results support the hypothesis of a high pCO2 greenhouse atmosphere during the Archean eon.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Water Resources
Yunyue Yang, Tao Xu, Xin Zhang, Le Ma, Mahjoor Ahmad Lone, Xiuyang Jiang
Summary: The study monitored the isotopic composition of rainfall in the Xianyun cave system in southeastern China, including a typhoon event. The delta O-18 values of typhoon rainfall differed significantly from typical monthly rainfall, while drip water showed minimal variations during the study period.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
David Dominguez-Villar, Kristina Krklec, Ian Boomer, Ian J. Fairchild
Summary: The isotope signature of cave waters was studied using the ISODRIP model based on data from Eagle Cave in central Spain. The results indicate that various factors, including flow routes, influence the isotopic signals of cave waters significantly.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Ben-Xun Su, Jing Wang, Meng-Meng Cui, Yong Wu, Kwan-Nang Pang, Sanjeewa P. K. Malaviarachchi, P. L. Dharmapriya
Summary: This study investigates element partitioning and Li-O isotope fractionation between silicate minerals and carbonatite melts at variable levels from mantle to crust. The results show that element partitioning is highly temperature- and pressure-dependent and can be used to evaluate carbonatite metasomatism and evolution.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geography, Physical
Marlone H. H. Bom, Karlos G. D. Kochhann, Guilherme Krahl, Nils Andersen, Lucas Oliveira, Valeska Meirelles, Mirian L. A. F. Pacheco, Andressa Esswein, Bruna C. Schneider, Gerson Fauth
Summary: A study found the presence of authigenic carbonates and rock-affinity carbonates in the calcite of early Danian benthic foraminifera, which altered the isotopic fractionation of oxygen. However, negative delta C-13 and delta O-18 values characteristic of the Dan-C2 were clearly recorded in bulk sediments, suggesting the potential of calcispheres for surface ocean paleoceanographic reconstructions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jiyuan Yin, Wenjiao Xiao, Christopher J. Spencer, Min Sun, Wen Chen, Huiqing Huang, Chao Yuan, Yunying Zhang, He Huang, Xiaoping Xia, Zaili Tao
Summary: Oceanic arc subduction systems are important sites for the recycling of oceanic crust and the production of juvenile arc crust. Sedimentary materials may be assimilated into oceanic arc magmas, promoting the transition from intra-oceanic arc to continental crust. The subduction and re-melting of juvenile sediments in oceanic arc systems may be a key mechanism for the maturation of oceanic arc crust.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geochemistry & Geophysics
Pooya Paydary, Alexandra E. P. Schellenger, Minerva Teli, Deb P. Jaisi, Annalisa Onnis-Hayden, Philip Larese-Casanova
Summary: This study found that reactive oxygen species such as ozone, hypochlorite, and hydrogen peroxide can completely or partially oxidize selenite to selenate within different time frames. Additionally, hydroxyl radicals generated by the photocatalytic decomposition of H2O2 can fully oxidize selenite within six hours.
Article
Geochemistry & Geophysics
David C. M. Fox, Lucy E. Mcgee, Juraj Farkas, Justin L. Payne, Samuel C. Spinks, Milo Barham, Mehrooz Aspandiar
Summary: Copper isotope analysis is a promising tool for understanding genetic processes in Cu ore deposits, but its applications to Archean Cu deposits have been limited. This study presents the first Cu isotope analysis of an Archean Cu deposit, revealing the relationship between the Cu isotope signature, ore grade, and alteration assemblage. These findings highlight the importance of copper isotope analysis in understanding the genetic processes of hydrothermal Cu deposits.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geology
Thomas Bovay, Pierre Lanari, Daniela Rubatto, Matthijs Smit, Francesca Piccoli
Summary: This study investigates the evolutionary history of the Theodul Glacier Unit (TGU) in the Western Alps using petrography, quantitative compositional mapping, thermodynamic modeling, and garnet dating. The results suggest a mono-metamorphic history with evidence of rapid initial exhumation and subsequent re-heating. The study provides valuable insights into the evolution of collisional orogens.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geology
Dmitry Zozulya, Ray Macdonald, Boguslaw Baginski, Petras Jokubauskas
Summary: The White Tundra pegmatites in NW Russia have diverse rare-metal mineralization and show various fractionation mechanisms.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Ray Macdonald, Boguslaw Baginski, Marcin Stachowicz, Dmitry Zozulya, Jakub Kotowski, Petras Jokubauskas
Summary: An unusual hydrothermal alteration scheme for chevkinite-(Ce) from the White Tundra pegmatite was presented. The altered chevkinite-(Ce) gradually transformed into a Pb-Ti-Fe-Si phase with enrichment in lead and uranium. The acidic nature of the fluids led to the formation of bastnasite-(Ce) instead of cerussite.
Article
Geosciences, Multidisciplinary
M. Buehler, R. Zurbriggen, A. Berger, M. Herwegh, D. Rubatto
Summary: This study investigates a well-preserved Schlingen structure in the Central Swiss Alps, revealing late Carboniferous peak metamorphic conditions and post-Schlingen transpressional deformation. This is significant for understanding the Variscan evolution and the formation of the Alpine belt.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Francesca Piccoli, Daniela Rubatto, Maria Ovtcharova, Jorg Hermann, Marcel Guillong, Alberto Vitale Brovarone
Summary: Carbonated ultramafic rocks are formed by peridotite serpentinization and carbonation at the seafloor, and studying their metamorphic evolution can provide insights into the history of the subducted ultramafic lithosphere. Perovskite, a mineral found in ophicarbonate rocks, has the potential to be used for geochronology. By analyzing trace elements and dating perovskite in ophicarbonate rocks from two metamorphic terranes in the Alps, it was found that metamorphic perovskite geochronology can provide meaningful U-Pb ages and is a useful tool for dating deformation and fluid flow in the subducted oceanic lithosphere.
Article
Geochemistry & Geophysics
David O. Zakharov, Johanna Marin-Carbonne, Andreas Pack, Tommaso Di Rocco, Martin Robyr, Torsten Vennemann
Summary: This study investigates the influence of marine diagenesis on the isotope composition of cherts obtained from deep-sea drilling. The results reveal significant ambiguity in interpreting seawater evolution due to the complex effect of diagenesis. The study also highlights the correlation between isotopic composition and petrographic features of cherts.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geology
D. O. Zakharov, D. R. Zozulya, D. P. Colon
Summary: Given the scarcity of reliable paleoclimate record, this study shows how analyzing the oxygen isotope values of surface precipitation recorded in Archean igneous and hydrothermal formations can help to understand the climate of early Earth.
Article
Geochemistry & Geophysics
Lyudmila Morozova, Dmitry Zozulya, Ekaterina Selivanova, Pavel Serov, Aya Bazai
Summary: This study examines the chemical variability and fractionation degree of different types of feldspar pegmatites in the Kolmozero lithium deposit in Russia. Trace element variations in K-feldspar are discussed in relation to the enrichment of rare elements in pegmatite systems. A model is proposed for the formation of the Kolmozero pegmatites.
Article
Geology
Carlos E. Ganade, Daniela Rubatto, Pierre Lanari, Joerg Hermann, Lucas R. Tesser, Renaud Caby
Summary: This study of ultrahigh-pressure (UHP) rocks reveals a comparable rate of exhumation in the Neoproterozoic and in modern collisional orogens, with significant implications for changes in the atmosphere and biosphere.
Article
Geology
Christophe Real, Kathrin Fassmer, Rodolfo Carosi, Nikolaus Froitzheim, Daniela Rubatto, Chiara Groppo, Carsten Muenker, Simona Ferrando
Summary: This study reveals the important features and evolution history of the middle crust of the Adriatic Sea. By analyzing petrological and geochronological data, various tectonic and thermal events during the early stages of the Alpine rifting were found to be interconnected with the thinning and heating of the middle crust.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Lyudmila N. Morozova, Sergey G. Skublov, Dmitry R. Zozulya, Pavel A. Serov, Elena S. Borisenko, Anna N. Solovjova, Alexandra K. Gavrilchik
Summary: A study on the chemical composition of beryl-bearing pegmatites in the Shongui deposit reveals high concentrations of lithium, rubidium, and tantalum. The unique chemical composition of the Shongui beryl belongs to the Li-Cs-Na type and suggests primary crystallization in the magmatic stage.
Meeting Abstract
Geochemistry & Geophysics
V. Malarewicz, B. Zanda, O. Beyssac, R. Hewins, D. Rubatto, J. Marin-Carbonne, H. Leroux, S. Pont, S. Bernard, S. Bouley
METEORITICS & PLANETARY SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Johanna Marin Carbonne, Andras Kiss, Anne-Sophie Bouvier, Anders Meibom, Lukas Baumgartner, Thomas Bovay, Florent Plane, Stephane Escrig, Daniela Rubatto
Summary: Secondary Ion Mass Spectrometry (SIMS) extracts information about a localized area of a solid target by analyzing secondary ions sputtered from its surface. SIMS can be used in various fields with different types of mass analyzers.
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)