Article
Geochemistry & Geophysics
M. Seyedali, L. A. Coogan, K. M. Gillis
Summary: The study reveals that the Li-isotopic composition of ancient seawater can offer important insights into the Earth system, and the Cretaceous upper oceanic crust may have acted as a sink for about 4 x 10(9) mol yr(-1) of Li.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Dominik A. Kardell, Zeyu Zhao, Evan J. Ramos, Justin Estep, Gail L. Christeson, Robert S. Reece, Marc A. Hesse
Summary: This study examines the conductive and advective heat losses in the oceanic crust along a flowline in the western South Atlantic, showing consistency with lithospheric cooling models and supporting a hydrothermal sealing age of around 65 Ma. The results confirm existing concepts of oceanic heat flow and provide a regional framework for future in-situ measurements.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Xiao-Yun Nan, Fei Wu, Hui-Min Yu, Jin-Ting Kang, Yong-Jun Gao, Fang Huang
Summary: This study investigates the behavior of barium isotopes during low-temperature seawater alteration and high-temperature hydrothermal alteration processes in the oceanic crust. The results show that the barium isotope compositions of the volcanic section and sheeted dike complex have large variations, possibly due to modification by seawater and hydrothermal fluid. The samples from the plutonic complex display lighter barium isotope compositions, reflecting the influence of late magmatic fluids. The recycling of the altered oceanic crust could result in barium isotope heterogeneity in the mantle.
Article
Oceanography
Ronja Paffrath, Katharina Pahnke, Philipp Boening, Michiel Rutgers van der Loeff, Ole Valk, Sandra Gdaniec, Helene Planquette
Summary: In the central Arctic Ocean, dissolved rare earth element concentrations and the neodymium isotope compositions remain constant in the deep water column, indicating unique seawater-particle interactions. The consistent particulate rare earth element concentrations suggest that particle composition is the primary factor preventing certain elements from being released into the dissolved pool.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Maayan Yehudai, Lucy E. Tweed, Sean Ridge, Yingzhe Wu, Steven L. Goldstein
Summary: Neodymium (Nd) isotope ratios are valuable for paleo-ocean circulation reconstructions, tracing water mass transport and mixing. Bayesian analysis shows that changes in end-member Nd concentrations have little impact on intermediate locations' Nd-isotope ratios, supporting their applicability for reconstructing past Atlantic paleo-circulation.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Donald J. DePaolo, Eric L. Sonnenthal, Nicholas J. Pester
Summary: Decades of research have led to the characterization of mid-ocean ridge hydrothermal systems. However, numerical models that account for the connections between heat transfer, hydrology, and geochemistry have been slow to develop. This paper describes the results of numerical simulations that demonstrate the relationships between fluid flow, temperature, heat transfer, and mineral-fluid reactions in a simplified mid-ocean ridge hydrothermal system. The simulations provide valuable insights into the role of these systems in Earth evolution.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Frerk Poppelmeier, Marcus Gutjahr, Patrick Blaser, Hartmut Schulz, Finn Suefke, Joerg Lippold
Summary: Research has shown that deep ocean carbon storage increased with limited variations in the past 100,000 years, with northern-sourced water dominating throughout. During Marine Isotope Stage 4, proportions of northern-sourced water even increased by approximately 15% in the Equatorial and Northeast Atlantic, questioning the idea that cold climates promote the expansion of southern-sourced water.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
A. J. Dickson, M. Davies, A. S. Cohen, M. -l. Bagard
Summary: During the early Paleogene, the closure of seaways that connected the Arctic Ocean to the global ocean resulted in severe hydrographic restriction. New osmium isotope data from organic-rich sediments in the central Arctic Ocean during the Early-Middle Eocene show that the isotopic composition of osmium in Arctic seawater began to differ from that of the global ocean after the Eocene Thermal Maximum 2 hyperthermal event, likely due to the gradual closure of seaways connecting the two oceans.
GEOCHEMICAL PERSPECTIVES LETTERS
(2022)
Article
Geochemistry & Geophysics
Xu (Yvon) Zhang, Giuseppe D. Saldi, Jacques Schott, Julien Bouchez, Marie Kuessner, Valerie Montouillout, Michael Henehan, Jerome Gaillardet
Summary: This study investigated the behaviour of lithium during the interaction of kaolinite with artificial seawater, revealing significant isotopic fractionation and implications for interpreting the lithium isotopic composition of both continental and marine waters. The results suggest that detrital material discharged by rivers to the ocean has the potential to strongly impact the isotopic signature of the ocean through the neoformation of clay minerals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Yusuke Miyajima, Michal Jakubowicz, Jolanta Dopieralska, Akihiro Kano, Robert G. Jenkins, Zdzislaw Belka, Takafumi Hirata
Summary: This study investigates the hydrogeological regime and structural evolution of the Cretaceous subduction zone in Hokkaido, Japan, by analyzing the timing and migration pathways of fluids emitted at ancient methane seeps. Results show that two fluid discharge events occurred during the accretionary stages, originating from the forearc basin rather than the underplating materials. The seeping fluids experienced interactions with the mafic rocks of the lower Sorachi ophiolite and siliciclastic sediments of the Yezo Group.
Article
Geosciences, Multidisciplinary
Joachim A. R. Katchinoff, Drew D. Syverson, Noah J. Planavsky, Erica S. J. Evans, Alan D. Rooney
Summary: Osmium isotope ratios are crucial in tracking global weathering and carbon cycle changes. Changes in seawater Os isotope records suggest variations in weathering due to increased uplift, impacting long-term global cooling. The amount of sulfide mineral precipitation in mid-ocean ridge hydrothermal systems is related to seawater chemistry changes, influencing the global Os cycle.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
I. N. Bindeman, J. O'Neil
Summary: This study investigates the hydrothermally altered oceanic crust from the Nuvvuagittuq greenstone belt in Canada, providing valuable insights into the early hydrosphere of the Earth. The findings suggest that the ancient oceanic crust underwent hydrothermal alteration at low temperatures similar to modern submarine oceanic sections. The results also reveal the isotopic compositions of the early oceans and the potential role of submarine weathering and hydrothermal silicification in the Eoarchean world.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
A. Mundl-Petermeier, S. Viehmann, J. Tusch, M. Bau, F. Kurzweil, C. Muenker
Summary: Banded iron formations serve as important geological materials to study the geodynamic evolution of the Earth, and the W-182 isotope signatures can track the flux of materials from continental weathering and hydrothermal activity. The study shows that the W-182 isotope content in banded iron formations is related to the differences in Si-rich and Fe-rich bands, highlighting the potential mechanism for crustal and upper mantle evolution.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Cheng Cao, Xiao-Ming Liu, Xi-Kai Wang, Jun Chen
Summary: Past variations in lithium concentration and isotope ratio of seawater recorded in marine carbonates have potential in tracing carbon cycles during climate transitions. However, obtaining reliable seawater Li isotope compositions from marine carbonates is challenging due to contamination from non-carbonate phases. We report an efficient protocol using sequential leaching to extract primary seawater Li and Sr isotope compositions from marine carbonates.
Article
Geology
Mathias Mueller, Carl Jacquemyn, Benjamin F. Walter, Chelsea L. Pederson, Simon L. Schurr, Onyedika A. Igbokwe, Niels Joens, Sylvia Riechelmann, Martin Dietzel, Harald Strauss, Adrian Immenhauser
Summary: This study evaluates spatial and temporal gradients in processes and products related to contact metamorphism, dolomitization, and dedolomitization of marine limestones in the Middle Triassic Latemar isolated platform in the northern Italian Dolomite Mountains. It sheds light on extreme textural and geochemical complexity through detailed analysis of petrography, fluid inclusion analysis, delta C-13 and delta O-18 data, and Sr-87/Sr-86 isotope ratios. These results are relevant for understanding alteration products ranging from high-grade metamorphic overprint to moderately altered limestones along vertical gradients, as well as the conservative marine delta C-13 and delta O-18 values in both marbles and low-temperature hydrothermal dolomites.
Article
Ecology
Bledina Dede, Christian T. Hansen, Rene Neuholz, Bernhard Schnetger, Charlotte Kleint, Sharon Walker, Wolfgang Bach, Rudolf Amann, Anke Meyerdierks
Summary: The study analyzed the microbial ecology of three different hydrothermal plumes in the Kermadec intra-oceanic arc in the South Pacific Ocean, revealing niche differentiation of the SUP05 clade based on sulfide and iron concentration as well as water depth.
Article
Geochemistry & Geophysics
Christian T. Hansen, C. Johan Lissenberg, Wolf-Achim Kahl, Wolfgang Bach
Summary: Troctolites, commonly found in association with oceanic core complexes, can provide insight into H-2 production on Early Earth. This study investigated the hydrothermal alteration of olivine-rich troctolites and found that temperature and reaction turnover have significant effects on the rock alteration process.
AMERICAN MINERALOGIST
(2022)
Article
Geochemistry & Geophysics
Victoria Kuerzinger, Alexander Diehl, Samuel I. Pereira, Harald Strauss, Gerhard Bohrmann, Wolfgang Bach
Summary: The Kemp Caldera, located in the southernmost part of the South Sandwich arc, has a unique hydrothermal system where sulfur and sulfide minerals coexist at high pH values. The formation of elemental sulfur in this system is believed to be a result of the synproportionation of SO2 and H2S, which has not been demonstrated in hydrothermal systems before. The study shows that the geochemical behavior of sulfur in arc/back-arc hydrothermal systems is more diverse than previously recognized.
Article
Geochemistry & Geophysics
Jan J. Falkenberg, Manuel Keith, Karsten M. Haase, Christian Sporer, Wolfgang Bach, Reiner Klemd, Harald Strauss, Bettina Storch, Christian Peters, Kenneth H. Rubin, Melissa O. Anderson
Summary: Submarine caldera volcanoes may have multiple hydrothermal systems, and their mineralogical and chemical composition is influenced by processes such as fluid boiling and magmatic volatile influx.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Samuel I. Pereira, Alexander Diehl, Jill M. McDermott, Thomas Pape, Lukas Klose, Harald Strauss, Gerhard Bohrmann, Wolfgang Bach
Summary: This study investigates the compositions of hydrothermal fluids in the East Scotia Ridge and reveals the temporal evolution of the fluids and the role of magmatic fluid influx. The results show that high-temperature fluid-rock interactions play a key role in setting the composition of the fluids, and conservative elements reflect the subseafloor mixing between different fluid sources. The study also suggests that the conditions at the E2 site are favorable for hosting a robust subseafloor biosphere.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Wolf-Achim Kahl, Andreas Kluegel, Wolfgang Bach, Mangir Murshed
Summary: Marcasite and pyrite precipitation was discovered within cavities formed by the dissolution of olivine in volcanic ash. The precipitation of FeS2 is related to Cr-spinel inclusions in the olivine. Rapid olivine dissolution is believed to be initiated by fluids containing reduced H2S that infiltrated grain boundaries or cracks. The acidic environment with hydrogen sulfide-bearing fluids enhances olivine dissolution and sequesters iron as FeS2.
AMERICAN MINERALOGIST
(2022)
Article
Geochemistry & Geophysics
Jennifer Zwicker, Daniel Smrzka, Inaki Vadillo, Pablo Jimenez-Gavilan, Manolis Giampouras, Joern Peckmann, Wolfgang Bach
Summary: The Ronda peridotite in southern Spain undergoes low-temperature serpentinization, resulting in the formation of hyperalkaline fluids. These fluids take up atmospheric carbon dioxide and precipitate travertine carbonates when they resurface. The distribution of rare earth elements in the spring waters differs from that in the fluids, suggesting the precipitation of travertine from different fluids.
APPLIED GEOCHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Frederike K. Wilckens, Christian T. Hansen, Alexander Diehl, Wolfgang Bach, Simone A. Kasemann
Summary: This study investigates the origin of high magnesium concentrations in acid-sulfate fluids from Brothers and Macauley volcanoes by analyzing the isotopic compositions of boron, lithium, and magnesium. The results suggest that water-rock interaction and phase separation are the likely mechanisms responsible for the magnesium enrichment observed in these fluids.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Lukas Klose, Charlotte Kleint, Wolfgang Bach, Alexander Diehl, Frederike Wilckens, Christian Peters, Harald Strauss, Karsten Haase, Andrea Koschinsky
Summary: This study presents the geochemical characteristics of high-temperature hydrothermal fluids sampled from the caldera of Niuatahi volcano, indicating variations in fluid compositions at different vent sites due to fluid-rock interaction and magmatic input.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Christoph Beier, Felix Genske, Christian Huebscher, Karsten M. Haase, Wolfgang Bach, Paraskevi Nomikou
Summary: This study presents new geological data from the Azores Plateau, indicating that the volcanic activity in the region is influenced by plate reorganisation and upper mantle anomalies. The model suggests that the flood basalt province of the Azores is only about 30% of previous estimates and may have been formed by excess melting in a localized, small-scale upper mantle region.
Article
Multidisciplinary Sciences
Christopher R. German, Eoghan P. Reeves, Andreas Turke, Alexander Diehl, Elmar Albers, Wolfgang Bach, Autun Purser, Sofia P. Ramalho, Stefano Suman, Christian Mertens, Maren Walter, Eva Ramirez-Llodra, Vera Schlindwein, Stefan Bunz, Antje Boetius
Summary: The Aurora hydrothermal field in the Arctic Ocean is unique due to its volcanic and mantle rock influences. With its large scale and high methane/manganese ratio, it differs from other hydrothermal systems, and sheds light on crust cooling, marine mineral distributions, and the search for extraterrestrial life.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Kathrin Busch, Beate M. Slaby, Wolfgang Bach, Antje Boetius, Ina Clefsen, Ana Colaco, Marie Creemers, Javier Cristobo, Luisa Federwisch, Andre Franke, Asimenia Gavriilidou, Andrea Hethke, Ellen Kenchington, Furu Mienis, Sadie Mills, Ana Riesgo, Pilar Rios, Emyr Martyn Roberts, Detmer Sipkema, Lucia Pita, Peter J. Schupp, Joana Xavier, Hans Tore Rapp, Ute Hentschel
Summary: This study presents a large-scale analysis of microbial diversity in deep-sea sponges. They show that sponge microbial abundance status, geographic distance, sponge phylogeny and the physical-biogeochemical environment drive microbiome composition, in descending order of relevance. The uniqueness of each deep-sea sponge ground stresses the need for their strategic preservation.
NATURE COMMUNICATIONS
(2022)
Correction
Multidisciplinary Sciences
Kathrin Busch, Beate M. Slaby, Wolfgang Bach, Antje Boetius, Ina Clefsen, Ana Colaco, Marie Creemers, Javier Cristobo, Luisa Federwisch, Andre Franke, Asimenia Gavriilidou, Andrea Hethke, Ellen Kenchington, Furu Mienis, Sadie Mills, Ana Riesgo, Pilar Rios, Emyr Martyn Roberts, Detmer Sipkema, Lucia Pita, Peter J. Schupp, Joana Xavier, Hans Tore Rapp, Ute Hentschel
NATURE COMMUNICATIONS
(2022)
Article
Ecology
Bledina Dede, Taylor Priest, Wolfgang Bach, Maren Walter, Rudolf Amann, Anke Meyerdierks
Summary: In this study, the microbial community composition of hydrothermal plumes in the Northern Tonga arc and Northeastern Lau Basin was analyzed using multiple culture-independent techniques, with a focus on the autecology of Alcanivorax. Alcanivorax was found to dominate the community at two sites, despite no indication for hydrocarbon presence in the plumes. The high abundance and gene expression of Alcanivorax in these areas may be related to undiscovered hydrocarbon seepage from the seafloor, potentially resulting from recent volcanic activity.
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)
