Article
Geochemistry & Geophysics
A. Cisneros de Leon, A. K. Schmitt, S. Kutterolf, J. C. Schindlbeck-Belo, W. Hernandez, K. W. W. Sims, J. Garrison, L. B. Kant, B. Weber, K. -L. Wang, H. -Y. Lee, R. B. Trumbull
Summary: The study of zircon in the Tierra Blanca eruptive suite sheds light on the long-term presence of magma within the Ilopango caldera, with zircon growth suggesting continuous activity for up to approximately 80,000 years before eruption. Contrasting crystallization timescales between different minerals help explain the complex processes leading up to volcanic eruptions, highlighting the importance of understanding magma dynamics for assessing volcanic risks.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geology
Qiong-Yao Zhan, Di-Cheng Zhu, Roberto F. Weinberg, Qing Wang, Jin-Cheng Xie, Liang-Liang Zhang, Zhi-Dan Zhao
Summary: Apatite, commonly found in various rocks, is a powerful tool for studying element partition between apatite and melt. Experimental data shows that melt composition strongly controls the partition of MgO in apatite. Contrasting behaviors of apatite MgO in volcanic and plutonic rocks provide insights into the debate about volcanic-plutonic connection.
Article
Geochemistry & Geophysics
Ping -Ping Liu, Sun-Lin Chung, Ben Ma, Xian-Hua Li, Qiu-Li Li, Hao-Yang Lee, Xiao-Ran Zhang
Summary: This study presents a complete dataset of zircon Hf-O isotopes of the latest Toba eruptions. The isotopic compositions of zircons vary slightly between eruptive units, suggesting an enriched and heterogenous magma source. The Hf-O isotopes of all the zircons are consistent with contamination of low-818O or high-818O materials during their ascent to the surface or storage in shallow magma reservoirs.
Article
Geochemistry & Geophysics
M. A. Finch, R. F. Weinberg, V. R. Barrote, P. A. Cawood
Summary: This study analyzed Hf isotopic ratios of magmatic and inherited detrital zircons in migmatites from the Puncoviscana Formation in NW Argentina, revealing variations in isotopic values and the effect of a boundary layer around dissolving detrital zircon grains. The Hf isotope ratios of zircon rims are partly controlled by their cores and the mean value of the magma, showing the influence of magma flow and chemical diffusion on heterogeneities. Different end-members of anatectic systems can be identified based on core effect, magma homogenisation, and nature prior to zircon crystallisation, allowing for a better understanding of processes that modify Hf isotopic ratios in anatectic rocks.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Janne Liebmann, Christopher L. Kirkland, John B. Cliff, Christopher J. Spencer, Aaron J. Cavosie
Summary: Oxygen isotopes are widely used in the Earth sciences to study temperature, paleoclimate, fluid-rock interaction, magmatic petrogenesis, and identification of extraterrestrial materials. Zircon is an important mineral for understanding Earth's crustal evolution through its primary magmatic oxygen isotope records. This paper presents a framework for measurement, assessment, and reporting of zircon oxygen isotope data, aiming to provide geologically meaningful interpretations.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Bidong Zhang, Yangting Lin, Desmond E. Moser, Paul H. Warren, Jialong Hao, Ivan R. Barker, Sean R. Shieh, Audrey Bouvier
Summary: The study examines the geochronology of lunar Mg-suite magmatic rocks, suggesting they originated from mafic intrusions into the anorthositic flotation crust of the lunar magma ocean. Analysis of zircon and baddeleyite indicates a crystallization age of approximately 4.33 billion years for the Mg-suite rocks, which is slightly younger than related ferroan anorthosites.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Janne Liebmann, Christopher L. Kirkland, John B. Cliff, Christopher J. Spencer, Aaron J. Cavosie
Summary: Oxygen isotopes are widely used in the Earth sciences to address various research questions, such as geothermometry, paleoclimatology, geochemical tracing, and planetary sciences. Zircon is a valuable mineral in understanding Earth's crustal evolution due to its robust records of primary magmatic O isotope ratio. This paper presents a comprehensive framework for the measurement, assessment, and reporting of zircon O isotope data, focusing on in situ analysis using secondary ion mass spectrometry.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Anne-Sophie Bouvier, Estelle F. Rose-Koga, Alexander R. L. Nichols, Clemence Le Lay
Summary: In this study, the oxygen isotope equilibrium between melt inclusions and their host olivines from arc samples was investigated for the first time. It was found that despite other major elements being in equilibrium, the majority of melt inclusions in the samples were not in isotopic equilibrium with their olivine hosts. This suggests that the melt inclusions are trapped in partly recrystallized olivines, highlighting the importance of magma mixing and crystal recycling in the magmatic plumbing system of these volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Maria Rosa Scicchitano, Romain Lafay, John W. Valley, Noriko T. Kita, William O. Nachlas
Summary: The study of serpentinites and ophicarbonates from ophiolitic terrains provides insights into the hydration and carbonation processes of modern oceanic lithosphere. The Chenaillet ophiolite in the western Alps, resembling a slow spreading center, was weakly affected by metamorphism. In this study, in situ analysis of oxygen and carbon isotopes in different minerals was conducted to understand the formation processes of ophicarbonates in the Chenaillet ophiolite. The results identify multiple stages of alteration and provide evidence for protracted serpentinization and carbonation similar to modern mid-ocean ridge venting systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Shuang-Qing Li, Axel K. Schmitt
Summary: The study analyzed zircon megacrysts from Quaternary intraplate basaltic volcanoes in northeastern Cambodia, revealing complex Li isotopic variations and suggesting multi-mode Li diffusion influenced by variable trace element inventories within individual crystals. The research also indicated diffusion-driven equilibration between zircon and basaltic melt, with pre-eruptive heating timescales estimated to be about 18 days.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Heather M. Kirkpatrick, T. Mark Harrison, Mauricio Ibanez-Mejia, Francois L. H. Tissot, Scott A. MacLennan, Elizabeth A. Bell
Summary: We conducted Zr isotope measurements on various minerals and rocks from the La Posta pluton in southern California to investigate the factors affecting Zr isotope fractionation in igneous rocks. We observed significant Zr isotope fractionation between titanite and zircon, which suggests that the relative order of phase appearance on the liquidus plays a role in Zr isotope evolution. However, factors such as crystallization order, temperature, and co-crystallizing phases do not fully explain the intracrystalline Zr isotopic distribution in zircons or the wide range of Zr isotopic values among zircons.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
E. Bruand, C. Storey, M. Fowler, B. Dhuime, R. Doucelance
Summary: It is well-established that lanthanide rare earth elements (REEs) have the potential to record the nature and source characteristics of their host magmas, in both whole-rock and their minerals. This study focused on the multi-isotope analysis of titanite, zircon and apatite from high Ba-Sr granitoids in Northwest Scotland, revealing compatible isotopic systems and providing insight into the overall, mineral, and rock isotopic characteristics of the region. The study demonstrates that magmatic titanite and apatite, in addition to zircons, can provide detailed petrogenetic records, and suggests that integrated multi-mineral approaches have the potential to maximize constraints from in-situ mineral isotope geochemistry.
Article
Geochemistry & Geophysics
Raiza R. Quintero, Kouki Kitajima, Jade Star Lackey, Reinhard Kozdon, Ariel Strickland, John W. Valley
Summary: The study of rocks in the central Sierra Nevada Batholith's Dinkey Dome pluton reveals complex oxygen isotope variations, indicating multiple interactions between magma and wall rocks and providing insight into the evolution of peraluminous magmas.
AMERICAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
C. J. Spencer, A. J. Cavosie, T. R. Morrell, G. M. Lu, J. Liebmann, N. M. W. Roberts
Summary: By comparing the oxygen isotope records of detrital and igneous zircons, it was found that there is a missing component of high oxygen isotope values derived from igneous rocks that have been eroded over the past 4.4 billion years. This challenges the current paradigm of Archean magmatism and questions the accuracy of detrital zircon records in reflecting the composition of the bulk continental crust.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Juntong Meng, Xiaoping Xia, Lin Ma, Ziqi Jiang, Jian Xu, Zexian Cui, Qing Yang, Wanfeng Zhang, Le Zhang
Summary: Research indicates that water content in zircon reflects the storage of water in the mantle, and also shows differences in water content of crustal melting products from different sources. The varying H2O content in zircon under different melting mechanisms highlights the influence of mantle water levels and crustal sources.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Simon Matthews, Oliver Shorttle, John Maclennan, John F. Rudge
Summary: The distribution of carbon within the Earth's mantle affects global and local carbon-trace element trends, with the C/Ba ratio in melt inclusions closely correlated with trace element enrichment. The variation in C/Ba ratios within melt inclusions from Iceland reflects similar trends observed globally, indicating a systematic influence of crustal processes and degassing on the mantle source.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Z. Taracsak, D. A. Neave, P. Beaudry, J. Gunnarsson-Robin, R. Burgess, M. Edmonds, S. A. Halldorsson, M-A Longpre, S. Ono, E. Ranta, A. Stefansson, A. Turchyn, M. E. Hartley
Summary: This study investigates matrix effects that arise during sulfur isotope analysis of glasses by SIMS, using over 600 sulfur isotope analyses of nine different glasses. The research reveals a nonlinear correlation between glass sulfur content and IMF, and demonstrates that models incorporating multiple elements can accurately predict instrumental mass fractionation. This highlights the importance of using well-characterized standards with a wide compositional range to calibrate SIMS instruments for sulfur isotope analyses of unknown silicate glasses.
Article
Marine & Freshwater Biology
Nicola Allison, Catherine Cole, Chris Hintz, Ken Hintz, James Rae, Adrian Finch
Summary: Increasing seawater temperatures can promote calcification in corals, but have little effect on pH levels. Temperature positively influences aragonite precipitation rate, but may not benefit the majority of corals.
Article
Geochemistry & Geophysics
K. J. Walowski, L. A. Kirstein, J. C. M. De Hoog, T. Elliott, I. P. Savov, R. E. Jones
Summary: The study presents the largest and most precise boron isotope dataset from ocean island basalt glasses and olivine-hosted melt inclusions, revealing the characteristics of volatile elements in the mantle and the processes generating different mantle reservoirs. It suggests that the deep mantle is becoming increasingly depleted in boron over time and highlights the decoupling of boron isotopes from radiogenic isotopes, providing a new perspective on volatile recycling.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
C. Cole, A. A. Finch, C. Hintz, K. Hintz, Y. Yu, N. Allison
Summary: Coral skeletal Sr/Ca can be a valuable proxy for sea surface temperatures, but its incorporation is influenced by seawater pCO(2), potentially affecting the applicability of modern Sr/Ca-SST calibrations to ancient specimens. Analysis suggests that Sr/Ca partition coefficient is related to seawater temperature and pCO(2), with significant variation between different coral genotypes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Shitou Wu, Yueheng Yang, Klaus Peter Jochum, Rolf L. Romer, Johannes Glodny, Ivan P. Savov, Samuele Agostini, Jan C. M. De Hoog, Stefan T. M. Peters, Andreas Kronz, Chao Zhang, Zhian Bao, Xiaojun Wang, Youlian Li, Guoqiang Tang, Lianjun Feng, Huimin Yu, Zhenxin Li, Le Zhang, Jie Lin, Yuan Zeng, Chunxue Xu, Yaping Wang, Zhu Cui, Li Deng, Jun Xiao, Yanhong Liu, Dingshuai Xue, Di Zhang, Lihui Jia, Hao Wang, Lei Xu, Chao Huang, Liewen Xie, Andreas Pack, Gerhard Worner, Maoyong He, Chaofeng Li, Honglin Yuan, Fang Huang, Qiuli Li, Jinhui Yang, Xianhua Li, Fuyuan Wu
Summary: The study analyzed the isotopic and Fe2+/sigma Fe ratios of ARM glasses using various techniques, showing homogeneity in isotopic ratios and Fe2+/sigma Fe ratios. Data quality was verified by comparing results from different techniques and laboratories, and LA-MC-ICP-MS and SIMS techniques were used to estimate isotopic ratio homogeneity. The ARM glasses are potentially valuable reference materials for in situ isotope ratio analysis.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Penny E. Wieser, Marie Edmonds, Cheryl Gansecki, John Maclennan, Frances E. Jenner, Barbara Kunz, Paula Antoshechkina, Frank Trusdell, R. L. Lee
Summary: The 2018 eruption of Kilauea Volcano in the Lower East Rift Zone (LERZ) involved a series of fissures erupting magmas with varying compositions. The magmas underwent extensive fractional crystallization, resulting in viscous and volatile-rich melts. Chemical analysis of the erupted products revealed the presence of a magma reservoir at a depth of about 2-3 km. These findings highlight the potential for hazardous explosive eruptions in ocean island volcanoes.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Matthew L. M. Gleeson, Sally A. Gibson, Michael J. Stock
Summary: Despite their low concentration in most oceanic basalts, volatile species have a significant influence on mantle and magmatic processes. This study demonstrates the possibility of reconstructing the volatile content history of basaltic magmas by integrating multiple volatile records.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Alberto Ceccato, Luca Menegon, Lars N. Hansen
Summary: The yield strength of quartz LTP under room temperature, high-stress conditions seems to be unaffected by the intracrystalline H2O content.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
M. J. Turuani, A. T. Laurent, A. -m. Seydoux-Guillaume, D. Fougerouse, D. Saxey, S. M. Reddy, S. L. Harley, S. Reynaud, W. D. A. Rickard
Summary: The discordance of U-Th-Pb isotopic systems in geochronometers and their interpretation remain major issues. This study investigated the discordant monazite from the Napier Complex in Antarctica to understand the relationship between discordance and the preservation of Pb*-bearing nanocrystals. The results highlight the potential of nanoscale studies of monazite to provide important details of the thermal history of complex metamorphic terranes.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
B. J. R. Harris, J. C. M. de Hoog, R. Halama
Summary: In situ measurements of nitrogen in silicate minerals reveal that white mica is the primary host for nitrogen, while other minerals such as clinopyroxene, amphibole, and epidote have lower nitrogen concentrations. Chlorite may also play a role in the nitrogen cycle in subduction zones. The findings provide important insights into the behavior of nitrogen during fluid-rock interactions and the migration of nitrogen in subduction zones.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Alexander A. Iveson, Madeleine C. S. Humphreys, Frances E. Jenner, Barbara E. Kunz, Ivan P. Savov, Jan C. M. De Hoog, Tatiana G. Churikova, Boris N. Gordeychik, Samantha J. Hammond, Pavel Yu Plechov, Jon Blundy, Samuele Agostini
Summary: This study investigates the magma generation and storage processes in the Tolbachik volcanic field, Russia, and explores the evolution of volatile phase and enrichment of chalcophile metals, particularly copper (Cu). The research reveals spatially variable magma storage conditions and different volatile contents and degassing histories for magmas feeding different monogenetic cones. The study also demonstrates that the Tolbachik volcanic field has a unique enrichment in Cu compared to other volcanoes in the region.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Jan C. M. De Hoog, Eleri Clarke, Keiko Hattori
Summary: Boron is an effective tracer of fluid processes in subduction zones, and olivine has the ability to scavenge significant amounts of boron from fluids at sub-arc pressures and temperatures. Transport of slab-derived material to magma sources requires processes with minimal interaction with mantle peridotite due to the abundance of olivine in the mantle wedge.
Article
Geochemistry & Geophysics
Benedict J. R. Harris, Jan C. M. De Hoog, Ralf Halama, Hans-Peter Schertl, Yi-Xiang Chen
Summary: This study investigates the sources and timing of fluid infiltration in the whiteschists from the Dora-Maira massif in the Western Alps. It utilizes boron isotopes and other fluid-mobile trace elements in phengite to understand the metasomatic fluid influx. The results suggest that a B-rich sediment-derived fluid is the main source of B in the whiteschists, while the source of the Mg-rich fluids cannot be determined. This study demonstrates the usefulness of in situ analyses in unraveling complex fluid-rock interaction histories.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Andre N. Paul, Joseph A. Stewart, Samuele Agostini, Linda A. Kirstein, Jan C. M. De Hoog, Ivan P. Savov, Kristina Walowski, James W. B. Rae, Tim Elliott
Summary: This study presents a low-blank sample preparation procedure for boron isotope measurement in silicate rocks using MC-ICP-MS. The method effectively addresses the challenges of volatilisation during silicate dissolution and contamination during chemical purification. The results demonstrate the accuracy and consistency of the method and reveal the heterogeneity in boron isotopes in the upper mantle.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
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)