Article
Geochemistry & Geophysics
Xia Wang, Zaicong Wang, Yongsheng Liu, Jung-Woo Park, Jonguk Kim, Ming Li, Zongqi Zou
Summary: The study investigates the Ca isotopic composition of arc lavas from the Tonga rear arc and Mariana arc in the western Pacific. Results show that carbonates released from the altered oceanic lithosphere do not significantly modify the Ca isotopic composition of the mantle wedge, possibly due to a limited Ca budget in slab fluids or homogenization effect of variable delta Ca-44/40 in slab fluids.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Review
Multidisciplinary Sciences
Shui-Jiong Wang, Shu-Guang Li
Summary: This paper reviews the Mg isotope geochemistry of silicate and carbonate during plate subduction. It explores how the subduction of carbonates and silicates can potentially fractionate Mg isotopes and change their chemical compositions. The study suggests that at different depths, the fluids involved in subduction may dissolve different carbonate minerals, leading to selective and partial dissolution. It also highlights the possibility of elemental and isotopic exchange between carbonate and silicate minerals within the subducting slab.
NATIONAL SCIENCE REVIEW
(2022)
Article
Geochemistry & Geophysics
Rachel Bezard, Simon Turner, Bruce Schaefer, Gene Yogodzinski, Kaj Hoernle
Summary: This study investigated the behavior of Re and Os during eclogite melting in primitive submarine lavas from the western Aleutian Arc. The results show that the Os-187/Os-188 of adakitic and non-adakitic volcanic rocks vary significantly but largely overlap, with the most radiogenic values occurring in samples with the lowest Os concentrations. The source of the adakites is unlikely to comprise significant eclogite-derived Os, suggesting minimal mobilization of Os during eclogite melting.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Evelyn Furi, Maxim Portnyagin, Nikita Mironov, Cecile Deligny, Andrey Gurenko, Roman Botcharnikov, Francois Holtz
Summary: The study indicates that the arc magmas feeding the Klyuchevskoy volcano contain significant amounts of nitrogen and carbon dioxide derived from the subducting slab, which are partially returned to the crust and atmosphere through arc-related magmatism.
Article
Geochemistry & Geophysics
Jin-Ting Kang, Yu-Han Qi, Kan Li, Jiang-Hao Bai, Hui-Min Yu, Wang Zheng, Zhao-Feng Zhang, Fang Huang
Summary: This study investigated the calcium isotope composition in arc magmas and found that despite evidence of carbonate metasomatism, no variation in calcium isotopes was observed. The buffering effect of the mantle wedge may homogenize different carbonate calcium isotope signals and affect calcium cycling efficiency in subduction zones.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Baptiste Debret, Carlos J. Garrido, Marie-Laure Pons, Pierre Bouilhol, Edward Inglis, Vicente Lopez Sanchez-Vizcaino, Helen Williams
Summary: Subducted serpentinites have the potential to control the exchange of volatile and redox sensitive elements between different parts of the Earth's mantle. Iron isotopes in meta-serpentinites from Cerro del Almirez show protolith compositional variations, while zinc concentrations and isotope signatures display a broad range of values, suggesting mobilization by subduction zone fluids with significant fractionation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Hanaya Okuda, Takehiro Hirose, Asuka Yamaguchi
Summary: Volcanic glass and smectite mixtures in subduction zone play an important role in fault slip behavior due to their frictional characteristics. Friction experiments were conducted on volcanic glass-smectite mixtures with varying smectite contents under different velocity conditions. The results showed that the friction coefficients decreased with increasing smectite content, and samples with 15%-30% smectite exhibited significant slip-weakening behavior. This study suggests that minor clay content in subducting volcanic ash layers may contribute to the occurrence of slow earthquakes in shallow depths of subduction zones.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Qiang Qiu, Sylvain Barbot
Summary: This study investigates the structural control on tsunami generation during seismic rupture propagation by analyzing high-resolution bathymetry, seismic reflection profiles, and tsunami-earthquake rupture models at global subduction zones. The researchers find that tsunami run-ups correlate with the width of the outer wedge of the frontal accretionary prism, which is made up of active faults. The prevalence of high-angle faults in the outer wedge provides a more efficient mechanism for seafloor uplift and tsunami wave excitation. This research is important for assessing seismic and tsunami hazards at subduction zones, especially in identified seismic gaps.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Stephen J. Turner, Charles H. Langmuir
Summary: Hydrous arc magmas are produced when water-bearing materials from subducted oceanic plates are transported to the mantle beneath volcanic arcs. The study shows that both sediment and ocean crust melt in arc volcanism, and the contribution of aqueous fluids to arc mass-balance is limited. Oxygen fugacity has a significant effect on slab melting. The research findings have important implications for understanding arc volcanism and the fluxes of elements into the deep mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Kan Li, Long Li
Summary: This study investigated the N concentrations and isotopic compositions of altered oceanic crust (AOC) samples from ODP/IODP Hole 1256D and DSDP/ODP Hole 504B, revealing a comparable N enrichment between sheeted dikes and basalts, indicating the intrusive oceanic crust as a significant N reservoir.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Eric Burdette, Greg Hirth
Summary: Novel fluid medium pressure cells were used to study the plasticity and deformation mechanism of antigorite under constant stress creep conditions. The experimental results are consistent with predictions based on subduction zone thermal models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geology
Li JiLei, Gao Jun, Huang GaoFeng, Ma ZhiPei, Wang XinShui
Summary: The subduction zone plays a crucial role in the sulfur exchange between the Earth's interior and surface. This study investigates the behavior and recycling of sulfur in the subduction zone, revealing its dominant species and isotopic composition. It is found that fluid is the main agent for transferring sulfur from the subducted slab to the mantle wedge. The research estimates the global sulfur influx and recycling efficiency in the slab-arc system. Overall, this study sheds light on the sulfur recycling in the subduction zone and its long-term global cycle.
ACTA PETROLOGICA SINICA
(2022)
Article
Geochemistry & Geophysics
Jonathan Wolf, David A. D. Evans
Summary: This study examines the long-term patterns of mantle convection and analyzes the significance of large low-shear-velocity provinces (LLSVPs) and surrounding subduction zones. The results indicate that idealized supercontinent cycle models can provide a good description of subduction zone locations, but additional factors need to be considered during certain periods.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geography, Physical
Agnes Kiraly, Francesca Funiciello, Fabio A. Capitanio, Claudio Faccenna
Summary: The migration and interactions of subduction zones in tectonic reconstructions lead to complex tectonic patterns, while fundamental properties such as slab buoyancy, dip direction, and coupled mantle flow determine the motions of single hinge zones. Interactions between zones alter the subduction force balance, shaping the direction of crustal movements.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geochemistry & Geophysics
Chong-Jin Pang, Liyan Tian, Xuan-Ce Wang, Hanyu Zhang, Shu-Nv Wen, Bryan Krapez, Wen-Jing Liu, Zhi-Xing Liu, Tao Wu
Summary: The decoupling of Hf-Nd isotopes in trench sediments is not only linked to the nature of provenance but also to hydrodynamic sorting processes during sediment transport. The variations in hafnium isotopic compositions in different depositional units can be explained by the different mineral compositions in each unit.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Shun Guo, Xu Chu, Joerg Hermann, Yi Chen, Qiuli Li, Fuyuan Wu, Chuanzhou Liu, Kyaing Sein
Summary: Research shows that fluid infiltration in metacarbonates triggers multiple stages of metasomatism, each resulting in varying degrees of CO2 loss.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Nicola Campomenosi, Marco Scambelluri, Ross J. Angel, Joerg Hermann, Mattia L. Mazzucchelli, Boriana Mihailova, Francesca Piccoli, Matteo Alvaro
Summary: Studying the ultrahigh-pressure whiteschists of the Brossasco-Isasca unit in the Western Alps reveals the diversity of garnet growth environments at different temperatures and pressures, indicating discrepancies between classical thermodynamic modelling and elastic thermobarometry.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geology
Jorg Hermann, Shayne Lakey
Summary: Constraining deep-water recycling along subduction zones is crucial to understanding how Earth has maintained a habitable planet. Chlorite-rich rocks play a significant role in this process, with high-pressure experiments revealing different mechanisms for water transfer under various conditions.
Article
Geology
Francesca Piccoli, Pierre Lanari, Jorg Hermann, Thomas Pettke
Summary: The study shows that metapelites and garnet peridotite from Cima di Gagnone underwent a common prograde to peak and retrograde P-T path, indicating they were subducted to depths where the slab gets heated by proximity to asthenospheric mantle related to slab break-off. The released fluids triggered partial melting in the associated metapelites, which might have favored the fast exhumation of the entire Cima Lunga unit. The findings offer new scenarios for the geodynamic interpretation of the Central Alps by comparing peak metamorphic conditions with other lithologies in the region.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Siggy S. Nformidah-Ndah, Peter M. E. Tollan, Joerg Hermann, Jean Pierre Tchouankoue
Summary: Clinopyroxene-bearing spinel harzburgites recovered from Cenozoic alkaline basalts from the Kapsiki plateau provide insights into the depletion and enrichment processes in the subcontinental mantle. The study reveals high concentrations of olivine and orthopyroxene, as well as a wide range of clinopyroxene compositions, suggesting partial melting and metasomatic refertilization. The presence of different generations of clinopyroxenes and orthopyroxenes, along with enrichment in certain trace elements, indicates the occurrence of multiple episodes of metasomatism dominated by silicate-carbonatite melts.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Multidisciplinary Sciences
Huijuan Li, Joerg Hermann, Lifei Zhang
Summary: The element ratios in global primitive arc basalts are found to be similar to those of sediment and/or oceanic crustal melts, rather than aqueous fluids or melange melts. This suggests that slab melt is primarily responsible for element recycling to the arc.
Article
Geochemistry & Geophysics
Melanie J. Sieber, Gregory M. Yaxley, Joerg Hermann
Summary: The devolatilization of subducting lithologies releases COH-fluids which can be partially sequestered in peridotites in the slab and forearc mantle. The channelized injection of COH-fluids doped with Ca-aq(2+), Sr-aq(2+) and Ba-aq(2+) into the dry forearc mantle was evaluated through piston cylinder experiments. The metasomatism process induced by COH-fluid is fast and efficient, leading to the sequestration of elements and CO2 into newly formed carbonates.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Shayne Lakey, Joerg Hermann
Summary: Four ultramafic bulk compositions were used to study the stability of chlorite in subducted, chlorite-rich rocks. Through piston cylinder experiments, it was found that chlorite is the most stable carrier of H2O to high temperatures in these rocks. The breakdown of chlorite can trigger wet melting, and the stability of chlorite is influenced by the composition and temperature conditions.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Elias D. Kempf, Joerg Hermann, James A. D. Connolly
Summary: Petrographic observations and mineral compositional analyses were used to determine the phase relations and reactions in pro-grade metamorphosed serpentinites in the Bergell contact aureole. The study found seven dehydration reactions, including three previously unidentified ones. Computed phase diagrams reproduced the observed mineral parageneses, with some exceptions. Petrography also revealed a retrograde overprint of the prograde parageneses due to metamorphic and magmatic fluids.
SWISS JOURNAL OF GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Lisa Kaatz, Julien Reynes, Jorg Hermann, Timm John
Summary: Granulites from Holsnoy in Norway underwent metastable state until fluid infiltration induced delayed eclogitization. The presence of interconnected hydrous eclogite-facies shear zones surrounded by unreacted granulites suggest rapid rock buffering of fluid composition. A cm-wide shear zone at early-stage eclogitization was analyzed to understand the relationship between deformation, fluid influx, and fluid-rock interaction. The study reveals the evolution of water-rich minerals from granulites to eclogites and identifies two mechanisms of fluid influx that contribute to the system's transition from rigid to weak.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Shun Guo, Joerg Hermann, Pan Tang, Xu Chu, Yi Chen, Bin Su
Summary: This study reveals that carbon-bearing silicate melts can form through the interaction of slab-derived, carbon-free, silicate melts with eclogite-facies metacarbonate rocks in a subduction-collision environment. This provides a new mechanism for the enrichment of carbon in slab-derived melts and an important pathway for the massive extraction of carbon from subducted slabs.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Editorial Material
Geosciences, Multidisciplinary
Jorg Hermann
Summary: Jorg Hermann suggests that serpentinization can serve as a natural analogue for a sequential economy due to its ability to generate clean energy, separate metals, and sequester carbon.
Article
Geochemistry & Geophysics
Michael C. Jollands, Elias M. Bloch, James A. Van Orman, Jorg Hermann, Hugh St. C. O'Neill
Summary: The diffusion of scandium in synthetic forsterite was studied at high temperature, and the results showed that the diffusion profile and shape vary with the scandium concentration.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Geochemistry & Geophysics
Razvan-Gabriel Popa, Peter Tollan, Jorg Hermann, Olivier Bachmann
Summary: The concentration of dissolved water in magmas is important for understanding volcanic eruption styles. Researchers have developed a fast and cheap method to measure water content in volcanic melt inclusions, and their study on the Nisyros-Yali volcanic center in the South Aegean Sea revealed that water loss during volcanic eruptions is common.
Article
Geochemistry & Geophysics
R. Tamblyn, J. Hermann, D. Hasterok, P. Sossi, T. Pettke, S. Chatterjee
Summary: In this scientific article, the importance of hydrous igneous rocks in crustal formation and the early water cycle is discussed. The study finds that hydrated greenstones, which release water during metamorphism, can trigger voluminous partial melting of basalt and ultimately create tonalite-trondhjemite-granodiorite (TTG) suites. Despite their low abundance in greenstone belts, hydrous igneous rocks potentially played a vital role in crustal formation and the early water cycle.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)