Article
Chemistry, Multidisciplinary
Anatoliy L. Drozdov, Lyudmila A. Zemnukhova, Alexandr E. Panasenko, Nataliya Polyakova, Arseniy B. Slobodyuk, Alexandr Yu Ustinov, Nina A. Didenko, Sergey A. Tyurin
Summary: The study compared the microscopic morphology and chemical characteristics of Hexactinellids and freshwater sponges, finding no fundamental differences in the chemical composition of their spicules, which can all serve as starting materials for creating new composite silicon-organic functional materials.
APPLIED SCIENCES-BASEL
(2021)
Article
Geochemistry & Geophysics
Kerry Schmidtbauer, Paula Noble, Michael Rosen, Daniel J. Conley, Patrick J. Frings
Summary: This study investigates the role of lake processes in determining the silicon isotope ratios of dissolved silicon and diatom biogenic silica in lakes. The research findings show species-specific fractionations of silicon isotopes in lakes, indicating the potential of using silicon isotopes as a paleolimnological proxy. Additionally, the study discusses the mass balance of silicon in lakes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Steve Lund, Gary Acton, Brad Clement, Makoto Okada, Lloyd Keigwin
Summary: The study presents important information on the paleomagnetic field variations during two specific periods based on PSV and excursion data obtained from ODP sites in the western North Atlantic. By correcting age estimates and comparing records, it reveals significant variability of the geomagnetic field at different timescales and characteristics of excursions, providing insights into the behavior of the magnetic field between reversals.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Andreas Pack, Eike-Matthias Bultmann, Michael Tatzel, Joachim Reitner
Summary: This study presents a laser fluorination technique for the measurement of triple silicon isotope ratios, which can provide valuable information on fractionation mechanisms and can be used as a proxy for seawater silicon isotopes. The high precision measurements of the triple silicon isotope ratios reveal the fractionation processes of silicon isotopes in various samples, including reference materials and sponge spicules.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
P. K. Sarath, K. R. Mangalaa, D. Cardinal, G. P. Gurumurthy, A. Dapoigny, V. V. S. S. Sarma, J. Riotte
Summary: This study presents the first investigation of silicon isotopic composition in river water from two contrasting basins in South India, showing the influence of seasonal changes and human activities on the isotopic signature.
Article
Geochemistry & Geophysics
Pierre Delmelle, Elena C. Maters, Julie A. Calkins, Francois Gaspard, Sophie Opfergelt, Susanna F. Jenkins
Summary: The presence of fluoride-bearing compounds in volcanic ash poses significant environmental and health hazards. Research suggests the existence of silicon hexafluoride salts, particularly Na2SiF6, in magmatic ash, which affects the F- concentration, acidity, and dissolved silicon isotope values. This highlights the important role of Na2SiF6 in modulating the environmental and health effects of ash emissions from fluorine-rich magmatic eruptions.
Article
Geochemistry & Geophysics
Yan Ye, Patrick J. Frings, Friedhelm von Blanckenburg, Qinglai Feng
Summary: This study investigated the formation of chert during the Ediacaran-Cambrian transition in South China, suggesting that the radiation of siliceous sponges and radiolarians contributed to a substantial decrease in oceanic dissolved silicon concentrations. This may have facilitated the main stage of the Cambrian Explosion by reallocating energy to new metabolic pathways and potentially establishing suspension-feeding communities.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geology
Kseniia Vasileva, Oleg Vereshchagin, Victoria Ershova, Mikhail Rogov, Irina Chernyshova, Irina Vishnevskaya, Tatiana Okuneva, Boris Pokrovsky, Marianna Tuchkova, Natalia Saphronova, Yuri Kostrov, Eduard Khmarin
Summary: The study reveals that glendonites are pseudomorphs after calcium carbonate hexahydrate and can serve as indicators of past cold climates. Multi-proxy analysis of samples from Sakhalin Island shows a complex mineral composition of glendonites, with isotopic values indicating seawater as the main oxygen source. The influence of continental runoff on isotopic composition and the rare earth element patterns suggest growth and replacement of ikaite occurred close to the aerobic-anaerobic boundary.
Article
Geosciences, Multidisciplinary
Damien Guinoiseau, Zuzana Fekiacova, Thierry Allard, Jennifer L. Druhan, Etienne Balan, Julien Bouchez
Summary: The study reveals that the central Amazonia region in Brazil underwent two major weathering episodes, with the first occurring around 35-20 million years ago and the second around 8-6 million years ago. The first weathering episode produced well-crystallized kaolinites, while the second episode led to the replacement of kaolinite by a new population with higher crystallographic disorder and stronger Si isotope fractionation.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Bianca T. P. Liguori, Claudia Ehlert, Eva-Maria Noethig, Jan C. van Ooijen, Katharina Pahnke
Summary: In the ice-covered Central Arctic Ocean, diatom production is limited by light availability and nutrient supply, with higher production at the sea ice edge and over partially ice-free shelf areas. The Transpolar Drift transports terrestrial-derived material across the CAO, impacting the Si cycle. Si isotopes help understand the differences in biological production areas and the potential influence of the TPD.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geology
Victor M. Giraldo-Gomez, Maria Rose Petrizzo, Elisabetta Erba, Cinzia Bottini
Summary: The study of benthic foraminiferal assemblages in ODP holes on Shatsky Rise revealed a progressive deepening of the region during the Early Cretaceous. The assemblages showed affinities with species from different bioprovinces, indicating a possible interconnectivity of ocean basins during this period.
CRETACEOUS RESEARCH
(2022)
Article
Geochemistry & Geophysics
Rayssa Martins, Marc Chaussidon, Zhengbin Deng, Francesco Pignatale, Frederic Moynier
Summary: Primitive chondrites have compositions close to the solar photosphere, with significant variations in elemental ratios indicating primary geochemical signatures and secondary variations due to processes such as incomplete volatilization of presolar components and high-temperature exchanges. Silicon isotopes in chondrites are important for constraining the origin of components and testing condensation scenarios. Variations in silicon isotopic composition of different components of the carbonaceous chondrite Allende suggest a global positive trend and support complementarity between chondrules, olivines, and matrix as a primary feature.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Guang-Gao Zheng, Xiaochun Liu, Junling Pei, Yue Zhao, Hong Chen, Jianfeng Li
Summary: By systematically investigating the mafic-intermediate dykes on Robert Island in West Antarctica, the petrogenesis and genetic relationship between the South Shetland Islands and the north-western Antarctic Peninsula can be deciphered. The study provides insights into the mechanism of Early Eocene magmatic activity and plate tectonics, emphasizing the significance of these findings.
GEOLOGICAL JOURNAL
(2022)
Article
Engineering, Environmental
Nannan Zhang, Daoping Xiang
Summary: Utilizing photovoltaic silicon waste (PSW), self-assembled 3D Si3N4@SiO2 nanofibre sponges with excellent compression resilience and thermal insulation properties have been developed. These porous sponges demonstrate ultra-low dielectric properties and have significant potential in aerospace, electronic devices, and thermal insulation applications.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Geochemistry & Geophysics
Lukas Ackerman, Franck Poitrasson, Tomas Magna, Ladislav Polak, Jana Durisova
Summary: The origin of cherts, rocks with >90 wt% SiO2, is related to dissolved seawater silica and its precipitation due to biological activity. The Si isotope systematics of cherts can serve as a proxy for their origin and depositional environment. This study determined the Si isotope compositions and Ge/Si ratios of cherts from different environments to understand their formation processes and sources of Si and Ge. The results indicate that deep-water cherts precipitated from seawater-derived low-temperature fluids, while shallow-water cherts formed from seawater interacting with hydrothermal fluids. Organic matter, Fe-(oxy)-hydroxides, and clays play a crucial role in global marine Si-Ge cycling.
Article
Geology
Morten Lunde Nielsen, Mirinae Lee, Hong Chin Ng, Jeremy C. Rushton, Katharine R. Hendry, Ji-Hoon Kihm, Arne T. Nielsen, Tae-Yoon S. Park, Jakob Vinther, Philip R. Wilby
Summary: The correct interpretation of soft-bodied fossils relies on a thorough understanding of their taphonomy. This study investigates the mineral replacements in panarthropod fossils from the Sirius Passet Lagerstatte and reveals the potential impacts of deeper burial and metamorphism on fossil preservation. The study provides critical context for interpreting the Sirius Passet biota and identifies late-stage overprints in other biotas.
Article
Engineering, Environmental
Christian Marz, Felipe S. Freitas, Johan C. Faust, Jasmin A. Godbold, Sian F. Henley, Allyson C. Tessin, Geoffrey D. Abbott, Ruth Airs, Sandra Arndt, David K. A. Barnes, Laura J. Grange, Neil D. Gray, Ian M. Head, Katharine R. Hendry, Robert G. Hilton, Adam J. Reed, Saskia Ruhl, Martin Solan, Terri A. Souster, Mark A. Stevenson, Karen Tait, James Ward, Stephen Widdicombe
Summary: The Arctic is undergoing unprecedented and dramatic transformations in response to climate change, with a disproportionate focus on visible aspects like sea ice melt and the fate of megafauna. However, the importance of the shelf seafloor in regulating nutrients and sequestering carbon is often overlooked. Climate change and regional adjustments to human activities may alter the biogeochemical and ecological dynamics of the Arctic shelf seafloor, impacting ecosystem function, carbon burial, and nutrient recycling. Mitigating climatic and anthropogenic change requires recognizing the vital role of the Arctic benthic system.
Article
Geochemistry & Geophysics
James P. J. Ward, Katharine R. Hendry, Sandra Arndt, Johan C. Faust, Felipe S. Freitas, Sian F. Henley, Jeffrey W. Krause, Christian Marz, Hong Chin Ng, Rebecca A. Pickering, Allyson C. Tessin
Summary: The biogeochemical cycling of silicon in the Barents Sea is affected by physical and chemical changes, including warming, sea ice retreat, and decreased dissolved silicic acid concentrations. Changes in phytoplankton community composition will affect the material in the sediment and its recycling at the seafloor.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
F. S. Freitas, S. Arndt, K. R. Hendry, J. C. Faust, A. C. Tessin, C. Marz
Summary: Carbonate chemistry of the Arctic Ocean seafloor and its vulnerability to ocean acidification remain poorly understood. This study employs an integrated data-model assessment to investigate benthic pH and carbonate chemistry in the Barents Sea, revealing the main drivers of carbonate dynamics and estimating benthic fluxes of dissolved inorganic carbon and alkalinity. The findings highlight the importance of organic matter degradation and bottom water conditions in shaping sedimentary carbonate chemistry and have significant implications for predicting carbon burial and pH buffering in the Arctic Ocean in the future.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Editorial Material
Environmental Sciences
Katharine R. Hendry
Article
Environmental Sciences
Holly Wallington, Katharine Hendry, Rupert Perkins, Marian Yallop, Sandra Arndt
Summary: Riverine dissolved silicon (DSi) and biogenic silica (BSi) in estuaries are influenced by various biotic and abiotic processes. The benthic diatom-dominated biofilm system plays a crucial role in controlling silicon transport in alluvial estuaries. The Severn Estuary in the UK was studied to enhance our understanding of silicon transport in benthic-dominated systems. The study found that river and tidal hydrodynamics drove changes in DSi concentrations, and that benthic biofilms on intertidal mudflats contributed to high BSi content in the estuary.
Article
Geochemistry & Geophysics
James Kershaw, Joseph A. Stewart, Ivo Strawson, Maria Luiza de Carvalho Ferreira, Laura F. Robinson, Katharine R. Hendry, Ana Samperiz, Andrea Burke, James W. B. Rae, Rusty D. Day, Peter J. Etnoyer, Branwen Williams, Vreni Haussermann
Summary: Based on the study of modern Stylasteridae corals, it is found that [Ba]SW and sample mineralogy are the main factors influencing coral Ba/Ca ratios, while seawater temperature has a weak influence. Paired Sr/Ca measurements suggest that the variability in scleractinian Ba/Ca may be related to varying degrees of Rayleigh fractionation during calcification. Stylasteridae corals have the potential to be an important new archive for paleoceanographic studies.
Article
Geochemistry & Geophysics
F. Yang, Y. D. Sun, P. J. Frings, L. Luo, J. W. E, L. N. Wang, Y. F. Huang, T. Wang, J. Muller, S. C. Xie
Summary: Permian chert successions were geographically extensive, but there was a multi-million-year chert gap in the Early Triassic. The weakening of chert production was related to water column deoxygenation, increased carbonate and siliciclastic components, and decreased primary productivity. The primary cause of Early Triassic chert demise is the loss of siliceous biomass during the end-Permian crisis.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Environmental Sciences
Johan C. Faust, Philippa Ascough, Robert G. Hilton, Mark A. Stevenson, Katharine R. Hendry, Christian Maerz
Summary: The association of organic carbon with iron minerals (Fe-R) is crucial for its long-term storage and burial efficiency in marine sediments. However, uncertainties exist regarding the sources, age, lability, and composition of this organic matter. This study uses radiocarbon and stable isotopes to investigate the source and age of Fe-R-associated organic carbon in Arctic marine sediments. The results suggest that fresh and marine organic matter rapidly binds with Fe-R, protecting and stabilizing labile organic matter and highlighting the potential of the organic carbon-iron association as an efficient carbon burial mechanism.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Hong Chin Ng, Jon R. Hawkings, Sebastien Bertrand, Brent A. Summers, Matthias Sieber, Tim M. Conway, Felipe S. Freitas, James P. J. Ward, Helena V. Pryer, Jemma L. Wadham, Sandra Arndt, Katharine R. Hendry
Summary: Glacier meltwater provides silicon and iron to downstream ecosystems, but their transportation to the ocean is regulated by benthic cycling within fjord systems. The study found that higher fluxes of dissolved iron and relatively lower fluxes of dissolved silicon in glacial fjord heads result from different reasons and have different implications compared to other areas.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Multidisciplinary Sciences
M. Tatzel, P. J. Frings, M. Oelze, D. Herwartz, N. K. Luensdorf, M. Wiedenbeck
Summary: The O-18/O-16 ratio of cherts increases over time, and two explanations have been proposed: cooling seawater temperature and increasing seawater delta O-18. However, this study shows that cherts are a reliable record of diagenetic temperatures, and the timing and temperature of quartz precipitation are determined by the kinetics of silica diagenesis. Heat flow through the sediment column has decreased over time, accounting for part of the increase in delta O-18(chert), which eliminates the need for extreme seawater temperature or delta O-18(sw) reconstructions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Correction
Chemistry, Medicinal
Catherine R. Back, Henry L. Stennett, Sam E. Williams, Luoyi Wang, Jorge Ojeda Gomez, Omar M. Abdulle, Thomas Duffy, Christopher Neal, Judith Mantell, Mark A. Jepson, Katharine R. Hendry, David Powell, James E. M. Stach, Angela E. Essex-Lopresti, Christine L. Willis, Paul Curnow, Paul R. Race
Article
Environmental Sciences
J. E. Hatton, H. C. Ng, L. Meire, E. M. S. Woodward, M. J. Leng, C. D. Coath, A. Stuart-Lee, T. Wang, A. L. Annett, K. R. Hendry
Summary: Glaciers and ice sheets are rapidly warming due to climate change, and research suggests that glacial meltwaters provide important nutrients to downstream ecosystems. However, the fate of these nutrients in fjord environments is still uncertain. A study in southwest Greenland used concentration data and isotopic compositions to investigate silicon cycling in two contrasting fjords. The results suggest that glacially derived amorphous silica may play a role in modifying coastal waters within fjords.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Michael J. Whitehouse, Katharine R. Hendry, Geraint A. Tarling, Sally E. Thorpe, Petra Ten Hoopen
Summary: We have created a database of macronutrient data obtained from 20 oceanographic cruises conducted primarily around South Georgia and the Scotia Sea. The database includes measurements of nutrients such as silicate, phosphate, nitrate, ammonium, and nitrite, along with temperature and salinity data. This comprehensive dataset provides valuable information for studying the ecology of the Southern Ocean and its surrounding regions.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Ecology
James P. J. Ward, Katharine R. Hendry, Sandra Arndt, Johan C. Faust, Felipe S. Freitas, Sian F. Henley, Jeffrey W. Krause, Christian Marz, Allyson C. Tessin, Ruth L. Airs
Summary: The Barents Sea has experienced rapid changes in water column warming and sea ice loss, leading to ecosystem adjustments and changes in phytoplankton species composition. The composition of phytodetritus at the seafloor, which plays a crucial role in nutrient recycling, may also be affected. Through modeling and observational data, researchers have identified the reaction pathways and important processes involved in the cycling of silicon within the seafloor. These findings have implications for understanding the benthic-pelagic coupling in the Barents Sea and the regional ocean silicon budget.
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)