Geochemistry Geophysics Geosystems最新文献

{"title":"The Complexity of Deep Aqueous Fluids in Planetary Ultramafic Mantles","authors":"Sophia E. Economon,&nbsp;Dimitri A. Sverjensky","doi":"10.1029/2025GC012637","DOIUrl":"https://doi.org/10.1029/2025GC012637","url":null,"abstract":"<p>Planetary volatiles cycle through a planet's crust, mantle, and atmosphere, playing a crucial role in surface processes and habitability. Discussions of planetary volatiles traditionally focus on water, carbon, nitrogen, and sulfur, but fluids in contact with silicate rocks and ultramafic mantles can contain significant amounts of magnesium and silicon. Ultramafic mantles may be common in our solar system and can be expected in many exoplanets. These environments have been studied through fluid inclusions in diamonds from Earth's upper mantle and in experiments of chloride-free fluids in equilibrium with peridotite. It appears that magnesium-chloride complexing is increasingly relevant at high temperatures and pressures, but such complexes are largely unconstrained for deep conditions. Effective models are needed to understanding volatile cycling on terrestrial worlds in our solar system and beyond. To address this, we analyzed published experimental data for silicate mineral solubilities in chloride-rich fluids to assess fluid speciation in ultramafic planetary mantles. We regressed experimental solubilities of talc + quartz and tremolite + talc + quartz at 2 kb and 500–700°C, as well as solubilities of forsterite at 10 kb and 800–900°C to obtain new equilibrium constants for <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msubsup>\u0000 <mtext>MgCl</mtext>\u0000 <mn>2</mn>\u0000 <mn>0</mn>\u0000 </msubsup>\u0000 </mrow>\u0000 <annotation> ${text{MgCl}}_{2}^{0}$</annotation>\u0000 </semantics></math> and revised equilibrium constants for several magnesium-, calcium-, and silicon-bearing species. We then applied the DEW model to characterize the equilibrium constants over wide ranges of temperature and pressure. As a result, we produce a new and robust thermodynamic data set for magnesium-, calcium-, and silicon-chloride complexes at upper mantle conditions which enable modeling of magnesium transport in deep planetary fluids.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012637","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Transient Coastal Uplift Event Revealed by Pleistocene Marine Terraces Along the 2015 M8.3 Illapel Earthquake Rupture, Chile","authors":"Roland Freisleben,&nbsp;Julius Jara-Muñoz,&nbsp;Daniel Melnick,&nbsp;Dominik Brill,&nbsp;Simone Racano,&nbsp;Christian Creixell Torres,&nbsp;Ismael Murillo Rogers,&nbsp;Marcelo M. Rivadeneira,&nbsp;Manfred R. Strecker","doi":"10.1029/2025GC012781","DOIUrl":"https://doi.org/10.1029/2025GC012781","url":null,"abstract":"<p>Uplifted Pleistocene marine terraces in the Illapel area along the forearc of central Chile record spatially and temporally variable uplift rates on glacial-cycle timescales. However, the underlying mechanisms for this uplift variability and its potential relationship with the megathrust-earthquake cycle remain poorly understood. The Illapel region was affected by the 2015 <i>M</i>_W8.3 Illapel earthquake and provides an opportunity to assess the relationship between the megathrust seismic cycle and permanent coastal uplift. We combined mapping of late Pleistocene marine terraces along 300 km of coast with stratigraphic and sedimentological analyses, luminescence dating, morphometry, and numerical modeling to constrain the timing and rates of deformation. Our results reveal modest uplift rates of 0.1–0.2 m/ka during Marine Isotope stages (MIS) 9 and 5e that were superseded by rates between 0.5 and 0.9 m/ka during MIS 7, lasting for about 200 ka. The lack of a correlation between terrace-uplift rates and GPS velocities at the decadal scale suggests that permanent forearc deformation is unrelated to the coseismic and interseismic phases of the Illapel earthquake cycle. We also discard the influence of upper-plate normal faulting on patterns of surface deformation, as our dislocation modes suggest that it plays a secondary role. Instead, we propose that the short period of uplift acceleration was linked with changes in the margin boundary conditions caused by subduction of bathymetric anomalies from adjacent sea-mount chains. These results highlight the complexity of mechanisms controlling forearc deformation and the hidden dynamics of deep processes in subduction systems.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012781","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cretaceous Spatiotemporal Variations in Tectonic Shortening Directions in the Longmen Shan Tectonic Belt and Geodynamic Implications: Constraints From AMS Fabrics and Crustal Rotation in the Western Sichuan Basin","authors":"Lifu Hou,&nbsp;Lilin Lan,&nbsp;Zaizheng Zhou,&nbsp;Yuhang Cai,&nbsp;Qiwen Zhong,&nbsp;Fujun Liu,&nbsp;Zhen Yu,&nbsp;Yabo Tong,&nbsp;Junling Pei","doi":"10.1029/2025GC012896","DOIUrl":"https://doi.org/10.1029/2025GC012896","url":null,"abstract":"<p>As a major tectonic boundary along the eastern margin of the Tibetan Plateau, the Longmen Shan tectonic belt (LMSTB) underwent pronounced crustal shortening and thickening during the Cretaceous. However, the spatiotemporal evolution of Cretaceous shortening and the boundary's response to far-field tectonic forcing remain incompletely resolved. We conducted systematic anisotropy of magnetic susceptibility (AMS) measurements across a 724.1-m-thick continuous stratigraphic interval at the Jinmenguan section in the Western Sichuan Basin, which is constrained by a previously published, high-resolution magnetostratigraphic age model. Using existing paleomagnetic data, we reconstructed time-dependent rotations of the Jinmenguan section from 128 to 64 Ma. By integrating AMS fabrics dominated by layer-parallel shortening (LPS) with time-equivalent rotations, we restore a time-resolved record of maximum horizontal shortening directions for the LMSTB in a consistent time-geometry reference frame. The results indicate that shortening direction for the LMSTB from 128 to 64 Ma was dominated at the million-year scale by a persistent NW–SE-trending direction, while an additional shear component may have been superimposed during 102–90 Ma under oblique shortening conditions. These results provide a testable, high-resolution time series of Cretaceous shortening directions, clarify how the eastern plateau margin responded to far-field tectonic forcing, and place new constraints on models for Cretaceous shortening and crustal thickening in the LMSTB.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012896","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PyGMT: Bridging Python and the Generic Mapping Tools for Geospatial Visualization and Analysis","authors":"Dongdong Tian,&nbsp;Yvonne Fröhlich,&nbsp;Wei Ji Leong,&nbsp;Michael Grund,&nbsp;William Schlitzer,&nbsp;Max Jones,&nbsp;Leonardo Uieda,&nbsp;Joaquim Manuel Freire Luis","doi":"10.1029/2026GC013105","DOIUrl":"https://doi.org/10.1029/2026GC013105","url":null,"abstract":"<p>PyGMT is a free and open-source Python library that provides a high-level interface to the Generic Mapping Tools (GMT), a widely used command-line toolset for geospatial data processing, analysis, and visualization in the Earth, ocean, and planetary sciences. By bridging GMT with the Python ecosystem, PyGMT enables users to access GMT's powerful visualization and analysis capabilities directly within Python-based workflows, making them more accessible to a broader audience. PyGMT supports diverse data sources, including local and remote files, as well as familiar data structures such as numpy.ndarray, pandas.DataFrame, and xarray.DataArray objects, allowing users to process data efficiently and create a wide variety of publication-quality figures. Compared to GMT, PyGMT provides a Pythonic interface with intuitive parameters and arguments, lowering the barrier to entry for both new and experienced users, and extends GMT's functionality by integrating seamlessly with the broader scientific Python ecosystem. The project is actively maintained as a community-driven effort under the BSD 3-Clause License, with source code and issue tracking hosted on GitHub and user support provided through a Discourse forum. It emphasizes reliability, usability, and sustainability while fostering an open and welcoming community that encourages contributions of all kinds.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GC013105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-Resolution Anisian Marine Perturbation by Volcanism in the Eastern Paleo-Tethys","authors":"Zhenyang Lai,&nbsp;Danxin Li,&nbsp;Yonggang Yan,&nbsp;Qian Zhao,&nbsp;Enxiong Zhou,&nbsp;Yalan Fu,&nbsp;Xiaotai Deng,&nbsp;Thanakan Anchana,&nbsp;Apivut Veeravinantanakul,&nbsp;Punya Charusiri,&nbsp;Weitao Wang,&nbsp;Baochun Huang,&nbsp;Peizhen Zhang","doi":"10.1029/2025GC012902","DOIUrl":"https://doi.org/10.1029/2025GC012902","url":null,"abstract":"<p>Following the end-Permian mass extinction, the Middle Triassic Anisian Stage was still characterized by environmental perturbations that hindered biological flourishing, yet it remains uncertain whether these persistent Tethyan disturbances were coupled with the closure of the Paleo-Tethys Ocean. This study presents a high-resolution integrated analysis of the Anisian Pha Kan Formation in the Lampang Basin, Southeast Asia, combining zircon U–Pb geochronology, chemostratigraphy, and magnetic susceptibility. We established a floating astronomical time scale (ATS) tuned to 405-kyr long eccentricity cycles anchored by a high-precision U–Pb age of 244.24 ± 0.78 Ma. The results reveal two distinct environmental regimes. The early Anisian period was characterized by intense regional volcanism coupled with sharp negative carbon and oxygen isotope excursions, indicating volcanic activity-driven climate instability. Subsequently, the Pelsonian substage records the Pelsonian Negative Carbon Isotope Excursion (PENCIE). Our high-resolution analysis reveals that this carbon cycle perturbation is precisely coupled with a significant sedimentary shift at ∼244 Ma, marked by enhanced sedimentary noise and a synchronous rise in magnetic susceptibility (MS) and frequency-dependent MS. We interpret this synchronous transition as a tectonically driven forced regression and enhanced terrigenous input from pedogenically mature soils. The timing of this uplift event provides critical constraints on the assembly of Southeast Asia, supporting a Middle Triassic collision between the Sibumasu and Indochina terranes. Collectively, these findings suggest that sustained environmental perturbations driven by the coupling of arc volcanism and orogenic uplift hindered ecosystem recovery throughout the Middle Triassic, challenging the paradigm of Anisian environmental stability.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012902","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pore-Pressure Cycles and Slow Slip Generation on Mildly Velocity-Weakening Faults","authors":"Andrea Perez-Silva,&nbsp;Yoshihiro Kaneko,&nbsp;Ting Wang","doi":"10.1029/2025GC012823","DOIUrl":"https://doi.org/10.1029/2025GC012823","url":null,"abstract":"<p>Recent observations have revealed pore-fluid pressure fluctuations correlated with the occurrence of slow slip events (SSEs) in several subduction zones. These fluctuations, caused by fluid accumulation and migration before and during SSEs, may modulate the timing and characteristics of these events. To test whether pore-pressure changes can induce SSEs comparable to observations, we develop a physical model in which periodic changes in pore-fluid pressure are imposed on a planar velocity-weakening fault by varying the effective normal stress (one-way coupling). Fluid is assumed to be injected at the center of the fault and to diffuse along the fault plane according to the axisymmetric diffusion equation. Our results show that these perturbations produce a spectrum of slip behaviors, from quasi-periodic SSEs to earthquakes, including mixed behaviors. The induced SSEs have durations and magnitudes ranging from approximately 3 months to over a year and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mi>w</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${mathrm{M}}_{mathrm{w}}$</annotation>\u0000 </semantics></math>5.5–7.5. However, the model does not reproduce the full range of SSE properties observed in subduction zones, and the parameter space leading to SSEs is narrower than that of models with velocity-strengthening faults. These findings support the previously proposed idea that SSEs are more consistently reproduced by models of velocity-strengthening faults than by models of velocity-weakening faults subjected to pore-pressure perturbations.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012823","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the Magma Reservoir of Taupō Volcano Using Receiver Functions","authors":"William Buffett,&nbsp;Catherine Rychert,&nbsp;Nicholas Harmon,&nbsp;Finnigan Illsley-Kemp,&nbsp;Martha Savage,&nbsp;Eleanor Mestel","doi":"10.1029/2025GC012841","DOIUrl":"https://doi.org/10.1029/2025GC012841","url":null,"abstract":"<p>The Taupō Volcanic Zone (TVZ), one of the most active volcanic systems globally, poses significant hazards. To improve our understanding of crustal structure and implications for hazards, we apply P-to-S receiver function analysis, supplemented by S-to-P for validation, to temporary seismic network data surrounding Taupō volcano. This provides better structural detail beneath Taupō than previous studies, allowing finer constraints on geometry, crustal structure, and magmatic zones. We image a positive discontinuity at 2–6 ± 1 km depth likely related to the base of a volcanoclastic layer. Beneath the collapse caldera, the phase is broader and deeper (10–16 ± 1 km depth), interpreted as the lower boundary of an upper-crustal silicic mush zone. A negative discontinuity is widespread between 13 ± 2 km and 24 ± 3 km depth, likely at the top of a lower-crustal magmatic zone. Southeast of Taupō we image an additional negative discontinuity (30 ± 3 km depth), suggesting complex layering. We image a positive discontinuity at 28–33 ± 3 km depth beneath Lake Taupō and northwest, deepening to 33 ± 3–39 ± 4 km depth southeast of the caldera, interpreted as the Moho. These findings provide crucial constraints on the size, depth, and structure of the magma reservoir and crust beneath Taupō, suggesting an approximate maximum magma mush volume of ∼800 km³. Imaging supports a volcanically thickened crust beneath Taupō, and in the south and southeast, and/or extensional rifting processes thinning the crust to the northwest, potentially explained by decreasing extension rates southwards.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012841","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Borehole Waters From Hole U1601C (Atlantis Massif) Provide Constraints for a Deep-Sourced Formation Water That (Could) Feed the Lost City Hydrothermal Field","authors":"C. Geoffrey Wheat,&nbsp;Susan Q. Lang,&nbsp;Gordon Southam,&nbsp;Will Osborne,&nbsp;Ivan P. Savov,&nbsp;Samuele Agostini,&nbsp;Jordan Poitras","doi":"10.1029/2026GC012967","DOIUrl":"https://doi.org/10.1029/2026GC012967","url":null,"abstract":"<p>Hole U1601C, drilled during International Ocean Discovery Program (IODP) Expedition 399, reached a depth of 1,268 m below the seafloor (mbsf) in the Atlantis Massif (30°N, 42°W). This borehole represents only one of six boreholes that extends more than 700 m into oceanic rock, penetrating predominantly ultramafic lithologies, mostly composed of variously altered serpentinized peridotite and gabbro. We report geochemical data from borehole water collected after drilling and logging operations, providing a unique opportunity to investigate water–rock and hydrologic interactions and their implications for the origin of hydrothermal fluids at the Lost City Hydrothermal Field (LCHF), ∼800 m to the south. Solute concentrations and isotope compositions reveal trends consistent with four-component mixing. Borehole waters are a mixture of surface seawater used during drilling, freshwater introduced before logging, bottom seawater that entered after drilling, and formation water, which discharges into the base of the borehole. The upper 465 m of the borehole is dominated by seawater-freshwater mixtures, whereas deeper intervals contain increasing proportions of a zero-Mg, high-Ca formation water that constitutes up to 80% of the deepest samples. This formation water reacted with gabbroic and peridotite lithologies at temperatures ≥300°C, enriching the water in Ca, Li, Rb, Cs, and Sr. These findings are similar to models of deep-sourced hydrothermal fluids that discharge from LCHF. Our results provide the first direct evidence for deep, high-temperature fluid circulation through gabbroic and ultramafic lithologies beneath the Atlantis Massif and elucidate subsurface hydrologic processes that source Lost City's unique hydrothermal fluids.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GC012967","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Magnetic Mineralogy of Carbonaceous Chondrites: A Microscopy and Machine Learning Study of Meteorite WIS 91600","authors":"Richard J. Harrison,&nbsp;Po-Yen Tung,&nbsp;Thomas Ginnis,&nbsp;Farhang Nabiei,&nbsp;Ursula Shaw,&nbsp;Elias N. Mansbach,&nbsp;James Bryson","doi":"10.1029/2025GC012882","DOIUrl":"https://doi.org/10.1029/2025GC012882","url":null,"abstract":"<p>A central challenge in the paleomagnetic study of meteorites is to characterize their diverse remanence carriers. Here, we develop a machine-learning assisted workflow that combines multi-scale (mm to nm) and multi-dimensional (2D-3D) microscopy to build a comprehensive picture of ferromagnetic mineralogy in the C2 ungrouped carbonaceous chondrite Wisconsin Range (WIS) 91600. Scanning electron microscopy images are acquired across the entire thin section with sufficient resolution to locate all major remanence carrying ensembles. A deep learning classifier yields the volume fraction and morphometric properties of each ensemble, distinguishing between different textural varieties of the same ferromagnetic mineral. Chemical maps of representative ensembles are analyzed using an interactive machine-learning tool that provides automated mineralogical segmentation and hyperspectral unmixing of the underlying endmembers. Focused-ion-beam nanotomography is used to reconstruct representative volumes with 3D spatial resolution sufficient to characterize all remanence carriers down to the stable single-domain range. 4D scanning transmission electron microscopy provides access to grains in the superparamagnetic size range and diffraction data to enable phase identification. We conclude that the matrix, composed of phyllosilicates with fine-scale pyrrhotite, pentlandite and magnetite, has a high potential to carry strong and stable paleomagnetic remanence in carbonaceous chondrites. The magnetic contribution from matrix-hosted pyrrhotite is lowered in WIS 91600, however, due to transient heating inducing <i>M</i>C rather than 4C vacancy ordering. The remanence carrying potential of matrix-hosted magnetite is similar to magnetite framboids but is less likely to be adversely affected by strong interactions, making it the preferred target for paleomagnetism.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012882","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active Hydrothermal Hydrogen Emissions in Continental Collision Settings: Insights From the Southeastern Tibetan Plateau","authors":"Xuelian Huang,&nbsp;Xiaocheng Zhou,&nbsp;Jiao Tian,&nbsp;Yuwen Wang,&nbsp;Bingyu Yao,&nbsp;Zhaojun Zeng,&nbsp;Shuai Wang,&nbsp;Han Yan,&nbsp;Ruibin Li,&nbsp;Yingling Han,&nbsp;Yuxing Ren","doi":"10.1029/2025GC012790","DOIUrl":"https://doi.org/10.1029/2025GC012790","url":null,"abstract":"<p>Natural hydrogen (H₂) is a promising clean energy resource and a significant component of geothermal gases, yet its origins and release mechanisms remain poorly constrained. Here, we present geochemical and isotopic data (CO₂, N₂, Ar, H₂, He, CH₄, ³He/⁴He, δ¹³C-CO₂, and δ¹³C-CH₄) for hydrothermal gases from the Changning–Menglian suture (CMS), Tengchong volcanic field (TCV), and Red River fault zone (RRF) in the southeastern Tibetan Plateau. H₂ concentrations show pronounced regional contrasts, with the CMS (1.0–190,000 ppm) far exceeding those in the TCV (0.6–5902 ppm) and RRF (1.0–1746 ppm). In the CMS, active H₂ seepage reflects serpentinization of remnant oceanic lithosphere; in the TCV, magmatic degassing dominates, while in the RRF, fault-related processes and radiolysis prevail. Tectonic activity—ranging from seismic events to long-term lithospheric deformation—drives H₂ release, with faults serving as conduits for upward migration. During ascent, secondary processes (calcite precipitation and CO₂ dissolution) further modify the volatile composition, enhancing relative H₂ enrichment and forming N₂-rich and H₂-bearing fluids. These findings reveal the tectonic control on H₂ generation and migration, providing insights for natural H₂ exploration in the Tibetan Plateau and other tectonically active regions.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 7","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012790","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}