Review
Geosciences, Multidisciplinary
Irene Cornacchia, Marco Brandano, Samuele Agostini
Summary: Miocene is a crucial period for the global climate evolution and the geodynamic evolution of the Mediterranean basin, with global and regional factors controlling Miocene Mediterranean oceanography. Changes in Mediterranean shallow-water carbonate production were influenced by oceanographic conditions. The evolution in the Mediterranean from the early Miocene to the early Messinian was affected by factors such as regional tectonics, volcanism, and Indo-Pacific closure, impacting the composition of carbonate production and the development of coral reefs and other carbonate structures.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Hongbing Ji, Cheng Chang, Howard Omar Beckford, Changshun Song, Ruth E. Blake
Summary: The study found a clear genetic effect from the underlying bedrock, indicating that the profiles reflect in-situ weathering processes. Although there is no obvious relationship among chemical indices and isotope values, a significant correlation between Si and Li isotopes shows that the isotope fractionation in the studied profiles is mainly affected by the dissolution and formation of minerals during weathering.
Article
Geochemistry & Geophysics
Sonja Geilert, Elmar Albers, Daniel A. Frick, Christian T. Hansen, Friedhelm von Blanckenburg
Summary: The Mariana forearc is a unique location for exploring serpentinization and slab dehydration processes through Si stable isotope variations. Si isotopes in serpentine from different mud volcanoes show significant variations, indicating potential differences in fluid sources and evolution processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Qiong Chen, Mei-Fu Zhou, Xiao-Ping Xia, Ping-Ping Liu
Summary: It is known that the lithospheric mantle beneath eastern China is geochemically heterogeneous, with different isotopic compositions across the South China and North China blocks. Cenozoic basalts with abundant mantle xenoliths in eastern China are mainly influenced by lithospheric-scale faults. New Li and O isotopic data for these mantle xenoliths reveal that the mantle was modified by Pacific subduction. Different isotopic compositions in olivine grains from the South China and North China blocks suggest variations in metasomatism from different sources.
Article
Geosciences, Multidisciplinary
Ronghua Cai, Shan Xu, Dmitri A. Ionov, Jian Huang, Sheng-Ao Liu, Shuguang Li, Jingao Liu
Summary: Late Mesozoic-Cenozoic basalts from far eastern Russia bear very similar geochemical characteristics as Na-series Cenozoic basalts from eastern China. The extended region of Mg-Zn isotopic anomalies roughly coincides with the stagnant West Pacific slab beneath East Asia, and these basalts may be derived from mantle sources hybridized by recycled Mg-carbonates from the Pacific slab stagnant in the mantle transition zone.
JOURNAL OF EARTH SCIENCE
(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
Geosciences, Multidisciplinary
Riccardo Lanari, Alex Boutoux, Claudio Faccenna, Frederic Herman, Sean D. Willett, Paolo Ballato
Summary: We conducted a study on the spatial-temporal patterns of Cenozoic exhumation in the Mediterranean and the Middle East. By analyzing published low-temperature thermochronometric ages, we converted them into exhumation rates using thermal modeling and closure temperature kinetics. Our results show that exhumation rates vary across different tectonic blocks, indicating local control rather than regional control. The main driving processes include collisions between different plates and subduction and retreat of Neo-Tethys slabs and back-arc basins.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Julia Ribeiro, Christopher MacLeod, Johan Lissenberg, Jeff Ryan, Colin Macpherson
Summary: Subduction zones play a central role in the exchange of volatiles between different Earth reservoirs throughout its history. The composition of fluids released during subduction evolves as subduction progresses, with dehydration and melting processes being key. Serpentinization of the fore-arc mantle may facilitate subduction maturation and stabilization.
Article
Geosciences, Multidisciplinary
Takayuki Ishii, Eiji Ohtani
Summary: Research suggests that even under wet subducting slab conditions, olivine and wadsleyite exhibit dry transformation kinetics, which could contribute to deep-focus earthquakes and large slab deformation.
Article
Geochemistry & Geophysics
Sarah W. M. George, Nicholas D. Perez, William Struble, Magdalena Ellis Curry, Brian K. Horton
Summary: Subduction of aseismic ridges and flat slab subduction play important roles in Cordilleran orogenesis, enhancing rock uplift and exhumation in the overriding plate. Distinguishing between these drivers is possible in the Peruvian flat slab subduction zone, where the interactions between aseismic ridges and flat slab subduction can be assessed.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Engineering, Environmental
Bing Zhao, Zhiqiang Qian, Yinjun Qiao, Jun Li, Zhijian Wu, Zhong Liu
Summary: In this study, two different morphologies of Li4Ti5O12 materials were synthesized and their adsorption behaviors were studied through experiments and calculations. The results showed that the material with the (01-1) facet exhibited higher adsorption capacity and faster adsorption rate. The analysis of the adsorption mechanism revealed the importance of dehydration processes and ion exchange reactions in the adsorption behavior.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Jochen Knies
Summary: This work reports on the coupling of dinitrogen fixation and denitrification in oxygen-deficient waters of the Arctic Ocean during the Paleogene. The coupling fertilized marine phytoplankton growth and favored organic carbon burial. The study also indicates a shift in the main source of biologically available nitrogen due to changing nutrient availability and suggests that the Arctic Ocean has been fully ventilated since the early Neogene.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Peng-Fei Zhang, Mei-Fu Zhou, Graciano P. Yumul Jr, Christina Yan Wang
Summary: The Zambales ophiolite in the Northwest Philippines represents a remnant of forearc lithosphere formed during an Eocene subduction initiation event. High-Cr chromitites in the area are derived from mantle sources and show an evolution from Cpx-rich to Cpx-poor varieties.
Article
Geochemistry & Geophysics
Chris S. Marien, Elizabeth K. Drewes-Todd, Allen Stork, Erin Todd, James B. Gill, J. Elis Hoffmann, Kenichiro M. Tani, Charlotte Allen, Carsten Munker
Summary: Viti Levu in Fiji is an important location for studying the formation of continental crust. The diverse plutons found in this area provide insights into the processes involved in the development of juvenile crust. Analyses of major and trace elements, isotopes, and ages of the plutons reveal different suites and suggest a partial melting process in the formation of the crust.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Zhen-Hua Zhao, Qiang Wang, Xiao-Lin Xiong, D. A. Wyman, Zhenghua Bai, Gong-Jian Tang, He-Cai Niu, Yong Luo, Hai-Quan Liu, Yu-Lou Qiao
Summary: This study presents the major and trace element compositions of shoshonitic volcanic rocks from West Tianshan, NW China, and suggests that their enriched mantle source was metasomatized by aqueous fluid and hydrous slab melt.
Article
Geochemistry & Geophysics
Catriona D. Menzies, Roy E. Price, Jeffrey Ryan, Olivier Sissmann, Ken Takai, C. Geoffrey Wheat
Summary: Geological processes at subduction zones play a crucial role in seismic activity, plutonic and volcanic activity, and geochemical cycling between the oceans, crust, and mantle. By studying serpentinite mud volcanoes in the Mariana forearc, researchers have uncovered the mineralogical and chemical evolution of subducting oceanic plates.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Kata Molnar, Pierre Lahitte, Stephane Dibacto, Zsolt Benko, Samuele Agostini, Boglarka Donczo, Artur Ionescu, Ivica Milevski, Zita Szikszai, Zsofia Kertesz, Marjan Temovski
Summary: Late Miocene to Pleistocene volcanic activity in the Vardar zone in North Macedonia is associated with the tectonic evolution of the South Balkan extensional system and the northern part of the Aegean extensional regime. The study focused on three volcanic centers with sparse geochronological and geochemical data, revealing that the onset of scattered potassic to ultrapotassic volcanism in the region occurred around 8.0 million years ago. This research provides insights into the evolution of sedimentary basins and the metasomatism of the lithospheric mantle over time.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
E. Braschi, F. Mastroianni, S. Di Salvo, M. Casalini, S. Agostini, G. Vougioukalakis, L. Francalanci
Summary: The investigation of heterogeneous magma systems enhances the understanding of magma differentiation and transfer processes in active volcanoes, thus constraining the dynamics driving the eruptions and the related hazard. Magma heterogeneity is generally preserved in the coeval juvenile products of explosive eruptions, as it occurs in the Upper Pumice sequence, emplaced by the last sub-Plinian explosive eruption at Nisyros volcano (Greece).
Article
Multidisciplinary Sciences
Hong-Yan Li, Xiang Li, Jeffrey G. Ryan, Chao Zhang, Yi-Gang Xu
Summary: The starting mechanism of subduction-related magmatism at convergent plate margins is still not well understood. This study investigates early-formed boninites from the Izu-Bonin arc and combines boron isotope variations with radiogenic isotopes and elemental ratios to document rapid changes in the sources and makeup of slab inputs as subduction begins. The results suggest that changes in the slab inputs involve a steepening subduction angle and cooling of the plate interface, allowing for subduction of slab sediment and basalt, and generating hydrous fluids at lower slab temperatures.
NATURE COMMUNICATIONS
(2022)
Article
Geology
Irene Cornacchia, Marco Brandano, Samuele Agostini, Axel Munnecke
Summary: This study analyzed the ε(Nd) records of central Mediterranean hardgrounds to identify the origin of phosphate-rich waters and understand the paleoceanographic evolution of the Mediterranean during the Miocene. The results reveal that eastern Mediterranean deep waters were influenced by runoff, unlike Atlantic and Indian Ocean waters. This record confirms the weakened Mediterranean circulation during the Miocene due to the closure of the Indian Gateway and indicates the importance of upwelling in phosphate hardground formation.
Article
Geochemistry & Geophysics
Lorenzo Fedele, Bahman Rahimzadeh, Giulia Salari, Samuele Agostini, Fariborz Masoudi, Michele Lustrino
Summary: The Cenozoic Arabia-Iran continental collision led to the emplacement of a variety of magmatic rocks, particularly evident in the Bijar-Qorveh area of NW Iran. The Miocene and Quaternary rocks in the region exhibit isotopic compositions suggesting previous subduction-related processes and a subsequent change in mantle sources during Quaternary extensional tectonics.
JOURNAL OF PETROLOGY
(2022)
Article
Multidisciplinary Sciences
F. Mastroianni, E. Braschi, M. Casalini, S. Agostini, S. Di Salvo, G. Vougioukalakis, L. Francalanci
Summary: This data article provides a detailed description and dataset of 67 pyroclastic rock samples from the Upper Pumice (UP) explosive activity of Nisyros volcano. The data includes geochemical and mineralogical compositions, as well as Sr-Nd isotope ratios. The acquired data are essential for understanding the complex history of mafic melts and their role in the recent explosive phase of activity at Nisyros volcano. Additionally, the geochemical and isotopic analyses contribute to the general knowledge of Aegean volcanics.
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
Geochemistry & Geophysics
Enrico Cannao, Marco Scambelluri, Othmar Muentener, Benita Putlitz, Samuele Agostini
Summary: The trace element and isotopic compositions of exhumed high-pressure mafic rocks provide important information on chemical processes in subduction zones. In this study, the boron isotopic composition of eclogitic mafic rocks from the Voltri Massif, Italy, was investigated to understand oceanic inheritance and subduction-related processes. The results suggest that the negative 811B signatures in eclogites are mainly caused by dehydration processes during subduction, while positive 811B signatures are likely inherited from oceanic sources or influenced by fluids released by serpentinites.
Article
Geochemistry & Geophysics
Lidia Butjosa, Aitor Cambeses, Joaquin A. Proenza, Idael F. Blanco-Quintero, Samuele Agostini, Manuel Antonio Iturralde-Vinent, Antonio Garcia-Casco
Summary: Exotic blocks of massive antigorite-serpentinite in Cuba provide evidence of a deep-seated subduction channel. Two types of rocks, antigoritite and dolomite-bearing antigoritite, are present in the Villa Clara serpentinite-matrix melange. Fluid infiltration and multi-step metasomatic processes occurred, resulting in vein network formation, tremolitite precipitation, and blackwall formation. Thermodynamic modeling suggests the infiltration of deep-seated fluid during exhumation in the subduction channel. The compositions of the rocks indicate the involvement of fluids from the subducting plate, sediments, and altered oceanic crust.
Article
Geochemistry & Geophysics
Hong-Yan Li, Chao Xie, Jeffrey G. Ryan, Chuan-Mao Yang, Rui-Peng Zhao, Chao Zhang, Yi-Gang Xu
Summary: This study investigates the geochemical variations in volcanic rocks from the Kurile arc and identifies three different sources of material in the magma, including shallow slab-sourced low-temperature hydrous fluids and deeper high-temperature hydrous melts, as well as the metasomatized Kurile forearc mantle. The authors propose a new model to interpret these variations.
Article
Geology
Lidia Butjosa, Aitor Cambeses, Joaquin A. Proenza, Samuele Agostini, Manuel Iturralde-Vinent, Luis Bernal-Rodriguez, Antonio Garcia-Casco
Summary: The Villa Clara serpentinite-matrix melange in central Cuba is part of the large ophiolitic belt of the Greater Antilles. The composition of ultramafic and mafic rocks allows classifying them into two main groups: MORB-like mantle typical of abyssal peridotite and refractory mantle-wedge forearc peridotites. These two groups indicate different melting processes and the influx of fluids evolved from the subducting slab. The geodynamic evolution from abyssal to forearc settings explains the nature of the oceanic lithosphere and the formation of serpentinization and melange.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Stephen J. Turner, Mattison H. Barickman, Julian Rodriguez, David A. Fike, Clive M. Jones, Kun Wang, Ivan P. Savov, Samuele Agostini, Michael J. Krawczynski, Rita Parai
Summary: The geochemistry of arc magmas provides insight into the chemical outfluxes from subducting slabs. Boron (B) abundances and isotope ratios act as tracers of slab-derived components, with new measurements in Nicaraguan volcanic centers indicating a B-rich slab component primarily sourced from subducted altered oceanic crust (AOC) and minor input from subducted sediments. This finding suggests that the volatile element budget delivered to the volcanic arc is mostly derived from the ocean crust and that volatiles may be recycled into the deeper mantle beneath Central America.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Hong-Yan Li, Chao Xie, Jeffrey G. Ryan, Christopher J. Spencer, Liang Liu, Yi-Gang Xu
Summary: The decomposition of serpentinite below the subducting slab played an important role in generating fluid/melt to fertilize the subarc mantle in the Kurile arc volcanic rocks. However, the classic model of decomposition of hydrous minerals in subducting marine sediments and altered basalts cannot explain the compositions of Kurile lavas. We propose that the decomposition of serpentinites from below the subducting slab led to extraction of Pb and Sr from relatively unaltered oceanic crust, suggesting a switch in subducting oceanic crust types occurred between 50 and 42 Ma.
Correction
Geochemistry & Geophysics
Michele Lustrino, Giulia Salari, Bahman Rahimzadeh, Lorenzo Fedele, Fariborz Masoudi, Samuele Agostini
JOURNAL OF PETROLOGY
(2022)
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)
