Geochemistry Geophysics Geosystems最新文献

{"title":"Climax of Late Paleoproterozoic Rift-Related Magmatism in the Columbia Supercontinent: Insights From a 1.77–1.76 Ga Large Igneous Province of the Dunhuang Block, Northwest China","authors":"Masumeh Sargazi,&nbsp;Chuan-Lin Zhang,&nbsp;Xian-Tao Ye,&nbsp;Zhi-Hao Song,&nbsp;Hong-Ran Wang","doi":"10.1029/2025GC012382","DOIUrl":"https://doi.org/10.1029/2025GC012382","url":null,"abstract":"<p>Widespread mafic magmatism at ca. 1.8–1.7 Ga across fragments of the Columbia supercontinent records a transition in the Earth's supercontinent cycle. The paleogeographic position of the Dunhuang Block in northwestern China within Columbia, and its role in this tectonic reorganization, remain controversial. In this study, a potential fragment of a 1.77–1.76 Ga large igneous province (LIP), termed the Aksay LIP (ALIP), was identified that conformably overlies a coeval banded iron formation (BIF) in the northern Dunhuang Block. Field observations, zircon U–Pb dating, and whole-rock geochemical and Sr–Nd–Fe isotopic data for the bimodal volcanic rocks and BIFs allow us to reconstruct the paleo-position of the Dunhuang Block within Columbia and track the redox state at this time. The tholeiitic basalts were derived from an enriched mantle plume source in an extensional setting following the amalgamation of Columbia. The BIFs associated with the volcanic–sedimentary sequence were deposited in a sediment-starved marine rift basin, where Fe was likely sourced from distal hydrothermal vents in under anoxic and ferruginous conditions. These findings combined with global LIP correlations suggest a late Paleoproterozoic tectonic link between the Dunhuang Block and the North China Craton within the Columbia supercontinent.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012382","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715120","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":"Weathering of the Emeishan Large Igneous Province Enhanced the Nutrient Flux to the Oceans and Led to Late Permian Climate Cooling","authors":"Kunyue Ling,&nbsp;Hanjie Wen,&nbsp;Shengtao Gong,&nbsp;Ce Chen,&nbsp;Shengjiang Du,&nbsp;Runsheng Yin","doi":"10.1029/2025GC012795","DOIUrl":"https://doi.org/10.1029/2025GC012795","url":null,"abstract":"<p>Mafic continental large igneous provinces (LIPs) erupted rapidly and may have overwhelmed Earth's atmospheric and biospheric systems. However, the exact balance and interplay between short-term climate warming caused by CO₂ emissions and long-term cooling due to LIP weathering remains poorly understood. To investigate the influence of LIP emplacement on long-term climate change, we quantified the mass fluxes during the late Permian associated with the Emeishan LIP and its weathering products in the western Yangtze Cratonic Basin of southwestern China. The minimum value of the average denudation rate of the Emeishan LIP during the late Permian (Wuchiapingian) was 170.8 t/km²/yr, indicating enhanced capacity for atmospheric CO₂ consumption at that time. The estimated minimum dissolved element fluxes from the Emeishan LIP to the surface ocean were 2.29 × 10⁶ t/yr Si, 11.7 × 10³ t/yr P, and 68 × 10³ t/yr Fe, which account for 1.3%–3.4% of the fluxes from modern global rivers. These high nutrient fluxes led to an atmospheric CO₂ removal rate of 8.5–85 × 10⁶ t/yr through enhanced biological productivity, as estimated by the Fe fertilization model and dissolved Fe flux. This rate is approximately one order of magnitude higher than those resulting from Emeishan LIP basalt weathering and accounts for 0.05%–0.5% of the modern global CO₂ sink, which could have led to a reduction in atmospheric CO₂. Our results highlight the key role of LIPs in modulating Earth's climate over long time periods and in driving long-term cooling due to enhanced CO₂ drawdown caused by enhanced nutrient input to the surface ocean.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012795","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715131","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 Plume, Abandoned Ridge, or Ancient Slab? olivine-Hosted Melt Inclusions Record the Mantle Melting Conditions Below the East Pacific Revillagigedo Archipelago, Mexico","authors":"Janne M. Koornneef,&nbsp;Laurens J. J. Tromp,&nbsp;Igor K. Nikogosian,&nbsp;Eva M. Barning,&nbsp;Arwen Deuss,&nbsp;Yamirka Rojas-Agramonte,&nbsp;Pablo Davilla Harris,&nbsp;Douwe J. J. van Hinsbergen","doi":"10.1029/2025GC012699","DOIUrl":"https://doi.org/10.1029/2025GC012699","url":null,"abstract":"<p>The voluminous active volcanoes of the Revillagigedo Islands of Socorro and San Benedicto in the east Pacific Ocean exhibit hotspot geochemistry. However, the presence of a deep mantle plume has not been seismologically confirmed. Instead, a fossil subducted slab is identified in the lower mantle underneath the volcanoes. Moreover, the islands are located on the recently abandoned Mathematician Ridge. To test whether the mantle that melts carries signatures of a fossil mantle wedge, an extinct ridge, or a mantle plume, we present new combined major- and trace element data and Sr-Nd-Pb isotopic compositions on bulk rocks and olivine-hosted melt inclusions. We find broad trends between depleted mid-ocean ridge basalts (DMORBs) and enriched ocean island basalts (OIB)-type compositions. Highly variable melt inclusion compositions reflect melting of a locally heterogeneous source. The enriched melts do not carry fossil subduction wedge signatures, suggesting that the former wedge is no longer located above the deep slab remnant. From the melt inclusions, we derive melting P-T conditions between 1420–1493°C and 21–30 kbar, hotter and deeper than typical MORBs. This points at active mantle upwelling, which we confirm seismologically by a relatively deeper 410 km and shallower 660 km discontinuity, suggesting the presence of hot material to below the mantle transition zone. The enriched deep melts are thus likely plume-derived and are diluted by melts from a depleted component that melts shallow below the abandoned ridge. We hypothesize that a deep plume may be rising around the mid-mantle Socorro slab.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012699","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715185","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":"Thank You to Our 2025 Peer Reviewers","authors":"Jacqueline Dixon,&nbsp;Paul Asimow,&nbsp;Whitney Behr,&nbsp;Alvaro Fernandez Bremer,&nbsp;Marie Edmonds,&nbsp;David Hernández Uribe,&nbsp;Boris Kaus,&nbsp;Anne Paul,&nbsp;Sonia Tikoo,&nbsp;Branwen Williams","doi":"10.1029/2026GC013100","DOIUrl":"https://doi.org/10.1029/2026GC013100","url":null,"abstract":"<p>Geochemistry, Geophysics, Geosystems (G-cubed) is a leading Earth science journal that spans topics across all sections of the American Geophysical Union (AGU). The success of the journal depends entirely on the generosity, time, and expertise of our reviewers. This year, we received more than 757 peer reviews from over 931 individuals, with many of you providing more than one review. I know how many demands compete for your time, and I want to sincerely thank you for the care and effort you devote to reading and critically evaluating manuscripts. Your willingness to share your expertise is invaluable-not only to the journal, but to the entire scientific community. Because of your work, the papers we publish meet the highest standards of research excellence. Simply put, you make G-cubed the strong and respected journal that it is.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2026GC013100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714911","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":"Geochemical Disequilibrium at the Brittle-Ductile Transition","authors":"Raphaël Gottardi,&nbsp;Ryan McAleer,&nbsp;Gabriele Casale,&nbsp;Martin Wong","doi":"10.1029/2025GC012458","DOIUrl":"https://doi.org/10.1029/2025GC012458","url":null,"abstract":"<p>We investigate the microtextural, microchemical, and isotopic effects of late-stage ductile deformation in quartzite mylonites and kyanite–muscovite–quartz veins from the Raft River shear zone (Utah). Quartz microstructures record pervasive disequilibrium, expressed by unannealed features including undulatory extinction, deformation lamellae, and poorly defined fabrics, typical of waning deformation in shear zones. Microchemical disequilibrium is best preserved in kyanite quartzites, where CL-zoned kyanite records repeated fractures, overgrowth, and mineral precipitation, and in muscovite from muscovite-poor quartzite mylonites that shows minor-element zoning consistent with syn-deformational overgrowth on detrital cores. In contrast, muscovite from muscovite-rich kyanite quartzites exhibits minimal chemical zoning. These microchemical variations correlate with ⁴⁰Ar/³⁹Ar age systematics. Chemically zoned muscovite preserves variable single-step ages, including ∼150 Ma ages, reflecting retention of detrital cores. In contrast, syndeformational muscovite consistently yields Miocene ages, indicating recrystallization and new growth below argon closure temperatures that reset inherited isotopic signatures. Similar trends are observed in quartzite mylonites, where increasing quartz recrystallization and stronger crystallographic preferred orientations occur toward deeper structural levels. Together, these observations indicate increasing retrograde deformation and recrystallization with depth in the Raft River shear zone and demonstrate that strain-driven recrystallization exerts a first-order control on muscovite ages. We suggest that apparent thermochronologic gradients in retrograde shear zones may reflect recrystallization gradients rather than temperature gradients. Where cooling limits the thermal driving force for recrystallization, isotopic relics are preserved, and local deformation and fluid availability control re-equilibration. Consequently, isotopic disequilibrium—particularly in the ⁴⁰Ar/³⁹Ar system—may be the rule rather than the exception of retrograde tectonic environments.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012458","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147714885","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":"Pressure Dependence of Liquid Iron Viscosity From Machine-Learning Molecular Dynamics","authors":"Kai Luo,&nbsp;Xuyang Long,&nbsp;R. E. Cohen","doi":"10.1029/2025GC012684","DOIUrl":"https://doi.org/10.1029/2025GC012684","url":null,"abstract":"<p>We have developed a machine-learning potential that accurately models the behavior of iron under the conditions of Earth's core. By performing numerous nanosecond scale equilibrium molecular dynamics simulations, the viscosities of liquid iron for the whole outer core conditions are obtained with much less uncertainty. We find that the Stokes-Einstein relation is not accurate for outer core conditions. The viscosity is on the order of tens of mPa s, in agreement with previous first-principles results. We present a viscosity map as a function of pressure and temperature for liquid iron useful for geophysical modeling.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012684","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147715306","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":"Crustal Magma Storage and Plumbing System Beneath the Tianchi and Wangtian'e Volcanoes, Changbaishan Intraplate Volcanic Field, China and North Korea","authors":"Xiaomeng Niu,&nbsp;Xingli Fan,&nbsp;Xin Wang,&nbsp;Qi-Fu Chen,&nbsp;Yanru An,&nbsp;Daining Yang,&nbsp;Yunjie Ji,&nbsp;Yuhan Ding,&nbsp;Jianhong Kang,&nbsp;Sheng Guan","doi":"10.1029/2025GC012821","DOIUrl":"https://doi.org/10.1029/2025GC012821","url":null,"abstract":"<p>The Changbaishan volcanic field, which includes the Tianchi and Wangtian'e volcanoes in China and the Namphothe volcano in North Korea, is one of the most complex and hazardous volcanic regions on Earth due to its tectonic setting and explosive Holocene activity. Although the magmatic structure beneath the Tianchi volcano has been widely studied, the subsurface systems beneath the Wangtian'e and Namphothe volcanoes remain unknown. Using receiver function data from a dense seismic array, we present the first high-resolution images of crustal thickness and <i>V</i>_<i>p</i>/<i>V</i>_<i>s</i> structure across the Tianchi and Wangtian'e volcanic fields. <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>H</mi>\u0000 <mo>−</mo>\u0000 <mi>κ</mi>\u0000 </mrow>\u0000 <annotation> $H-kappa $</annotation>\u0000 </semantics></math> stacking shows that the Tianchi volcano is underlain by a thick crust with high <i>V</i>_<i>p</i>/<i>V</i>_<i>s</i>, while the Wangtian'e volcano has normal crustal thickness but similarly elevated <i>V</i>_<i>p</i>/<i>V</i>_<i>s</i>. Common Conversion Point imaging reveals strong negative phases at depths of 5–10 km beneath both volcanoes, marking the likely tops of major crustal magma chambers. Ambient noise tomography, derived from the densest broadband data set collected in this region, also detects pronounced low-velocity zones at similar depths. These results indicate that the two volcanoes form an interconnected magmatic system: mantle-derived melts pool near the Moho beneath the Tianchi volcano and then migrate laterally to supply separate magma reservoirs beneath the Tianchi and Wangtian'e volcanoes. Notably, we identify partial melt beneath the Wangtian'e, a volcano long regarded as dormant or extinct, underscoring the need for continued monitoring and further geophysical studies of the entire Changbaishan volcanic complex.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 4","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012821","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147585275","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":"Constraints on Noble Gas Variability in OIB and MORB From Non-Equilibrium Magmatic Degassing Models","authors":"Thomas Williams,&nbsp;Stephen Parman,&nbsp;Christian Huber","doi":"10.1029/2025GC012720","DOIUrl":"https://doi.org/10.1029/2025GC012720","url":null,"abstract":"<p>Noble gas concentrations in ocean island basalts (OIB) and mid-ocean ridge basalts (MORB) are affected by degassing processes, obscuring their pre-eruptive characteristics. Degassing corrections commonly assume near-equilibrium partitioning of noble gases between melt and vapor. However, kinetic disequilibrium has been proposed as a mechanism capable of modifying noble gas ratios. For example, kinetic effects may allow OIBs to exhibit lower ³He contents than MORBs, even if OIB plumes sample a low ⁴He/³He “undegassed” primordial lower mantle—the so-called “Helium Paradox” (Gonnermann &amp; Mukhopadhyay, 2007, https://doi.org/10.1038/nature06240). It has also been suggested that kinetic effects allow OIB and MORB to share a homogeneous pre-degassing ³He/²²Ne ratio. Despite this, inferred mantle compositions may not require the presence of an “undegassed” reservoir, and there is evidence that OIB and MORB sources exhibit heterogenous ³He/²²Ne ratios. Here, we model the kinetics of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mtext>CO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${text{CO}}_{2}$</annotation>\u0000 </semantics></math> and noble gas exchange between bubbles and melt within a three-stage framework for magmatic ascent to evaluate the magnitude of non-equilibrium fractionation. The first and third stages treat the kinetics of bubble growth during closed-system decompression, whilst the second treats gas exchange between ascending bubbles and a melt at rest within a shallow, open-system, sub-volcanic reservoir. Across plausible ranges of ascent rate, bubble populations, and noble gas diffusivity, our results indicate that disequilibrium cannot produce variations in ³He contents and ³He/²²Ne ratios sufficient to reproduce the range observed in OIB and MORB. Therefore, OIB and MORB sources cannot share a homogenous ³He/²²Ne ratio, and disequilibrium does not resolve the “Helium Paradox.”</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012720","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568904","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":"Constraints on Noble Gas Variability in OIB and MORB From Non-Equilibrium Magmatic Degassing Models","authors":"Thomas Williams,&nbsp;Stephen Parman,&nbsp;Christian Huber","doi":"10.1029/2025GC012720","DOIUrl":"https://doi.org/10.1029/2025GC012720","url":null,"abstract":"<p>Noble gas concentrations in ocean island basalts (OIB) and mid-ocean ridge basalts (MORB) are affected by degassing processes, obscuring their pre-eruptive characteristics. Degassing corrections commonly assume near-equilibrium partitioning of noble gases between melt and vapor. However, kinetic disequilibrium has been proposed as a mechanism capable of modifying noble gas ratios. For example, kinetic effects may allow OIBs to exhibit lower ³He contents than MORBs, even if OIB plumes sample a low ⁴He/³He “undegassed” primordial lower mantle—the so-called “Helium Paradox” (Gonnermann &amp; Mukhopadhyay, 2007, https://doi.org/10.1038/nature06240). It has also been suggested that kinetic effects allow OIB and MORB to share a homogeneous pre-degassing ³He/²²Ne ratio. Despite this, inferred mantle compositions may not require the presence of an “undegassed” reservoir, and there is evidence that OIB and MORB sources exhibit heterogenous ³He/²²Ne ratios. Here, we model the kinetics of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mtext>CO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${text{CO}}_{2}$</annotation>\u0000 </semantics></math> and noble gas exchange between bubbles and melt within a three-stage framework for magmatic ascent to evaluate the magnitude of non-equilibrium fractionation. The first and third stages treat the kinetics of bubble growth during closed-system decompression, whilst the second treats gas exchange between ascending bubbles and a melt at rest within a shallow, open-system, sub-volcanic reservoir. Across plausible ranges of ascent rate, bubble populations, and noble gas diffusivity, our results indicate that disequilibrium cannot produce variations in ³He contents and ³He/²²Ne ratios sufficient to reproduce the range observed in OIB and MORB. Therefore, OIB and MORB sources cannot share a homogenous ³He/²²Ne ratio, and disequilibrium does not resolve the “Helium Paradox.”</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012720","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147569082","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":"Climate and Tectonic Forcing of Depositional Evolution in the Southern North China Basin Since ∼3 Ma","authors":"Ting Wang,&nbsp;Yujia Liu,&nbsp;Dianbao Chen,&nbsp;Longjiang Mao,&nbsp;Xiaoqian Deng,&nbsp;Chunhui Zou,&nbsp;Huichuan You,&nbsp;Fangtou Tang,&nbsp;Duowen Mo","doi":"10.1029/2025GC012746","DOIUrl":"10.1029/2025GC012746","url":null,"abstract":"<p>Marginal basins provide sensitive yet incomplete records of climate and tectonic forcing, and the southern North China Basin provides an ideal setting to decode these interactions since the late Pliocene. A 135.6-m borehole sequence, the XiaoQian (XQ) core, recovered from the Fuyang region, was dated using AMS ¹⁴C, OSL, and ESR, supplemented by magnetostratigraphic correlations to the parallel WLB core. Integrated analyses of physical and geochemical proxies were then employed to reconstruct the depositional evolution over the past ∼3 million years. The succession records three main stages. Stage I (∼3–1.6 Ma) comprises sandy delta-front deposits, indicating active progradation into a lacustrine basin. Stage II (∼1.6–0.128 Ma) consists of rhythmically bedded silty clays, recording hydrological instability on a delta plain. Stage III (∼0.128 Ma to present) is dominated by floodplain muds, reflecting low-energy alluviation under stable tectonic conditions. Variations in sediment continuity and thickness reflect the combined influence of tectonic segmentation and autogenic reworking, which modulated the completeness of the stratigraphic record. Within well-preserved intervals, elemental and magnetic proxies show coherent trends that parallel regional and global reference curves, indicating that monsoon hydroclimate and base-level fluctuations were the primary external controls, while local tectonic setting and depositional dynamics influenced how these environmental signals were recorded.</p>","PeriodicalId":50422,"journal":{"name":"Geochemistry Geophysics Geosystems","volume":"27 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GC012746","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147684066","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}