Geoscience frontiers最新文献

{"title":"Lacustrine organic carbon burial dynamics regulate Aptian-Albian greenhouse-cooling climate oscillations","authors":"Dongjun Song ,&nbsp;Yifeng Hong ,&nbsp;Jingyu Zhang ,&nbsp;Xinnan Fang ,&nbsp;Shuang Dai","doi":"10.1016/j.gsf.2025.102150","DOIUrl":"10.1016/j.gsf.2025.102150","url":null,"abstract":"<div><div>Investigating terrestrial response to typical greenhouse periods is essential to understand past and present climate-carbon-cycle interactions. The Cretaceous climate transition is thought to be related to carbon cycles, yet the role of lacustrine systems in modulating global carbon-climate feedback remains poorly constrained. Here, we present a high-resolution biogeochemical record from an Aptian-Albian paleolake in northwestern China, integrating biomarkers, nitrogen isotopes, and elemental proxies. We reveal that warm-humid climates during the early Aptian amplified lacustrine organic carbon burial via intensified denitrification, methane cycling, and nutrient fluxes, potentially reinforcing oceanic anoxic event 1a (OAE1a) hyperthermal conditions through N₂O/CH₄ emissions. Subsequent nitrogen limitation triggered cyanobacterial dominance, sustaining carbon sequestration under moderate weathering and contributing to cooling the late Aptian climate. A transient early Albian warming phase shifted the nitrogen pool towards NH₄⁺ and favored the bloom of eukaryotic algae, aligning with global OAE1b carbon burial and serving as one of the contributors to the late early Albian cooling climate. These dynamics demonstrate that paleolakes acted as both carbon sinks and greenhouse gas sources, exerting a critical but previously overlooked feedback on Cretaceous climate oscillations. Our findings highlight the dual role of lacustrine systems in past carbon cycle perturbations, offering insights for refining the relationships between the carbon cycle and climate changes in the Cretaceous.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102150"},"PeriodicalIF":8.9,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shale oil occurrence and mobility mechanisms in brittle mineral-enriched reservoirs: Insights from the Paleogene Kongdian Formation, Bohai Bay Basin","authors":"Bixiao Xin ,&nbsp;Fang Hao ,&nbsp;Jinqiang Tian ,&nbsp;Pengfei Guo ,&nbsp;Qilu Xu ,&nbsp;Wenzhong Han","doi":"10.1016/j.gsf.2025.102149","DOIUrl":"10.1016/j.gsf.2025.102149","url":null,"abstract":"<div><div>Understanding shale oil occurrence and mobility is essential for evaluating resource potential and optimizing exploration in lacustrine shale systems. This study investigates the Paleogene Kongdian Formation in the Bohai Bay Basin, integrating organic geochemistry, mineralogical analysis, scanning electron microscopy, solvent extraction, multi-step Rock-Eval pyrolysis, and 2-D NMR to characterize shale oil occurrence states and mobility mechanisms in brittle mineral-enriched reservoirs. Results indicate that shale oil mainly occurs in free and adsorbed states within interparticle pores, dissolution pores, microfractures, and organic pores, with most retained oil hosted in nanopores smaller than 200 nm. Quantitative analyses show that siliceous and calcareous shales possess higher movable oil ratios than clay-rich counterparts, primarily due to their rigid mineral frameworks that resist compaction and preserve interparticle and intragranular pores. These brittle-rich lithofacies exhibit broader pore size distributions, enhanced connectivity, and reduced adsorption affinity, facilitating more efficient oil accumulation and displacement. In contrast, micropore-dominated, clay-rich shales exhibit strong adsorption and limited pore continuity, which hinder hydrocarbon mobility. Appropriate TOC levels (2.0–4.5 wt.%) favor shale oil mobility, while excessive organic content increases adsorption, reducing the proportion of free oil.</div><div>Among various geological factors, brittle mineral content and thermal maturity play the dominant roles in controlling shale oil mobility, as they fundamentally shape pore structure and fluid properties. In combination with organic matter abundance and sedimentary features, these factors jointly govern pore network evolution and hydrocarbon occurrence states, thereby determining shale oil enrichment and extractability. These findings enhance the understanding of shale oil enrichment processes and provide a scientific basis for identifying sweet spots and optimizing development strategies in lacustrine shale reservoirs.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102149"},"PeriodicalIF":8.9,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Present-day temperature and pressure fields in key areas of Northeast China: Implications for unconventional resource evaluation","authors":"Yue Huang ,&nbsp;Jian Chang ,&nbsp;Nansheng Qiu ,&nbsp;Nobuo Maeda","doi":"10.1016/j.gsf.2025.102148","DOIUrl":"10.1016/j.gsf.2025.102148","url":null,"abstract":"<div><div>The temperature-pressure fields within hydrocarbon-bearing basins are key geological factors controlling hydrocarbon generation, migration, and accumulation. In this study, we focus on the Qingshankou Formation in the northern part of the central depression of the Songliao Basin, China. A multi-parameter weighted evaluation model was created using present temperature-pressure field characteristics, with formation temperature-pressure as core variables, to evaluate shale oil resource potential. In addition, we explored the control mechanisms of temperature-pressure evolution during geological history on shale oil accumulation and further assessed the applicability of the proposed method. Our results show that the geothermal gradient of the Qingshankou Formation decreases from Member 1 to Member 3 (3.84 °C/100 m, 2.93 °C/100 m, and 2.49 °C/100 m, respectively). High-temperature zones are widely distributed in the Gulong sag, with the average temperature of the Gulong shale exceeding 95 °C and reaching an average of approximately 115 °C. Overpressure in the Qingshankou Formation exhibits a west-high to east-low trend. The overpressure zones of the Gulong shale are mainly concentrated in the Qijia-Gulong and Sanzhao sag, with average pressure coefficients of 1.52 and 1.36, respectively. The Opc model identified Class I and II favorable zones, mainly located in the central and southern parts of the Gulong Sag, as well as the central and southwestern Sanzhao Sag, with estimated shale oil resources of <span><math><mrow><mn>7.1</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>8</mn></mrow></msup></mrow></math></span> tons and <span><math><mrow><mn>17.2</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>8</mn></mrow></msup></mrow></math></span> tons, respectively. Evolutionary profiles from representative wells indicate that elevated temperatures enhance organic matter maturation and light oil generation, improving shale oil mobility, while overpressure suppresses hydrocarbon dissipation and provides a sufficient driving force for oil production. This study demonstrates that present-day temperature-pressure fields effectively reflect the evolution trends of paleo-thermal and pressure regimes. The proposed evaluation method shows strong applicability and scalability, offering a new technical framework and theoretical foundation for the exploration of unconventional hydrocarbon resources.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102148"},"PeriodicalIF":8.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extreme drought affects lake water quality, quantity, morphometry: Evidence from China’s largest fresh water lake under the 2022 global drought","authors":"Xihua Wang ,&nbsp;Zejun Liu ,&nbsp;Y. Jun Xu ,&nbsp;Boyang Mao ,&nbsp;Shunqing Jia","doi":"10.1016/j.gsf.2025.102146","DOIUrl":"10.1016/j.gsf.2025.102146","url":null,"abstract":"<div><div>Extreme drought poses a significant threat to humanity. In the summer of 2022, the world experienced the worst drought in recent years, with a precipitation deficit and an abnormal high temperature, profoundly affecting human life and the aquatic environment. However, the drought influence on large freshwater lakes remains unclear. In this study, we selected China’s largest freshwater lake (Poyang Lake) as the research object and investigated the lake water area, quantity, lake morphology and water quality in 2018 (normal season) and 2022 (extreme drought period). Results showed that standardized precipitation index (SPI), standardized runoff index (SRI) and standardized precipitation-evapotranspiration index (SPEI) reached moderate to severe drought in the summer of 2022. From 2018 to 2022, lake water area decreased (1789.62 km²), water quantity reduced (15.40 × 10⁹ m³) and lake shoreline decreased (2923.70 km). The shoreline development index, size ratio and energy factor decreased by 4.87, 198.53 m and 963.60, specifically. The dynamic ratio, relative depth and Schindler’s ratio increased by 1457.10, 0.04 and 13.48 m⁻¹, respectively. The water chemical indicators varied significantly in two years and the water hydrochemical types changed from SO₄·Cl − Ca·Mg type and HCO₃ − Ca·Mg type to SO₄·Cl − Ca·Mg type from 2018 to 2022. Water-rock interaction, alternating cation adsorption and anthropogenic influence on water quality represented different patterns in two periods. Our findings demonstrate significant differences in water resources and quality between common and extreme drought conditions in China’s largest fresh water lake, which can inform research on climate change effects on international large freshwater lakes.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102146"},"PeriodicalIF":8.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermokarst disturbance responses to climate change across the circumpolar permafrost regions from 1990 to 2023","authors":"Ya Liu ,&nbsp;Haijun Qiu ,&nbsp;Ninglian Wang ,&nbsp;Dongdong Yang ,&nbsp;Kailiang Zhao ,&nbsp;Guoqing Yang ,&nbsp;Wenchao Huangfu ,&nbsp;Wanqi Luo","doi":"10.1016/j.gsf.2025.102147","DOIUrl":"10.1016/j.gsf.2025.102147","url":null,"abstract":"<div><div>Warming climate drives permafrost degradation and forms serious thermokarst disturbances, with significant impacts on geomorphology, hydrology, and ecological processes. However, the long-term monitoring of thermokarst disturbances and their next development remains a challenge across the circumpolar permafrost regions. Here, we calculate six spectral indices from Landsat images to represent greenness, wetness, and brightness, quantifying the spatiotemporal characteristics of thermokarst landscape dynamics and further revealing their development with a warming climate. Additionally, DNMI, NDWI, and NDVI are selected to verify the occurrence and severity of retrogressive thaw slumps, thermokarst lake expansion, and drainage by the LandTrendr algorithm on the Google Earth Engine platform. Three major types of thermokarst events show a consistent disturbance year, correlating with the summer temperature increase point around 2000. Their correlation analysis also reveals that the subsequent landscape development of thermokarst disturbances is related to the warming context, showing vegetation greening and soil wetting trends. These findings highlight the dynamic characteristics of thermokarst disturbances from 1990 to 2023, providing a comprehensive understanding of thermokarst development under a changing climate.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102147"},"PeriodicalIF":8.9,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How energy intensity and global energy dynamics shape renewable energy transition in APEC economies","authors":"Guixian Tian ,&nbsp;Xiang Hua ,&nbsp;Danyu Li ,&nbsp;Junyi Tian","doi":"10.1016/j.gsf.2025.102134","DOIUrl":"10.1016/j.gsf.2025.102134","url":null,"abstract":"<div><div>This study examines the critical factors influencing the adoption of modern renewable energy in selected APEC countries from 1997 to 2023, with a focus on their implications for sustainable development and environmental sustainability. Using dynamic panel data estimation techniques (Arellano–Bond and system dynamic panel-data estimation), we analyze the interplay between energy intensity, world energy balances, economic globalization, and the shadow economy in shaping the share of modern renewables in total final energy consumption. Our results indicate that higher energy intensity reduces renewable energy adoption, reflecting systemic challenges in integrating clean energy into high-demand systems. Conversely, world energy balances and economic globalization enhance renewable energy penetration, driven by decarbonization policies, technological advancements, and cross-border collaboration. Surprisingly, the shadow economy also plays a positive role, suggesting that informal sector activities may facilitate small-scale renewable energy investments. From a sustainability perspective, these findings underscore the need for APEC economies to prioritize energy efficiency, strengthen international cooperation, and implement inclusive policies that support renewable energy transitions. By addressing structural barriers and leveraging globalization, APEC nations can accelerate progress toward Sustainable Development Goals (SDGs), particularly SDG 7 (Affordable and Clean Energy) and SDG 13 (Climate Action). Policymakers are encouraged to design targeted interventions, including green financing mechanisms, technology transfer programs, and regulatory incentives, to align economic growth with long-term environmental sustainability.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102134"},"PeriodicalIF":8.9,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Felsic magmatism during Precambrian flat subduction","authors":"Alexei L. Perchuk ,&nbsp;Vladimir S. Zakharov ,&nbsp;Taras V. Gerya ,&nbsp;William L. Griffin","doi":"10.1016/j.gsf.2025.102133","DOIUrl":"10.1016/j.gsf.2025.102133","url":null,"abstract":"<div><div>The modern Earth’s crust is predominantly preserved in continents, marking a significant shift from early Earth when oceanic crust was far more dominant. The growth of continental crust, composed largely of felsic rocks, began ∼4 billion years ago in the Archean eon. The origins of these felsic rocks and thus the mechanism behind continental crust formation remains debatable, with contrasting tectonic regimes proposed for the Archean. Our new numerical modeling of intraoceanic plate convergence at elevated mantle potential temperatures (150‒200 °C higher than present day) corresponding to the early Earth shows a shallow-dipping (flat) regime of subduction and voluminous felsic magmatism (plutonic and related volcanic) forming a thin felsic crust on top of the overriding oceanic plate. This is in strong contrast to the modern deep and steep subduction regime, which results in notably less generation of both basaltic and felsic magmas. Further modeling shows that during subsequent flat subduction of oceanic crust containing thin felsic domains, these buoyant crustal segments detach from the shallow slab portions. They rise as diapirs through the serpentinised mantle wedge, thereby forming a thick nucleus of continental crust within the oceanic crust of the upper plate. The modeled migration of felsic melts and rocks through the mantle wedge is in agreement with the presence of Precambrian sanukitoids and to some extent by Mg, Ni, and Cr enrichment in rocks from tonalite-trondhjemite-granodiorite (TTG) suites. Therefore, we conclude that shallow Precambrian subduction likely contributed notably to the formation and recycling of continental crust in Earth’s early history.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102133"},"PeriodicalIF":8.9,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial regulatory mechanisms involved in groundwater arsenic enrichment: Synergistic interactions between key species and genes in C-N-S metabolism","authors":"Jingru Yang ,&nbsp;Qiao Li ,&nbsp;Ting Chen ,&nbsp;Hongfei Tao ,&nbsp;Youwei Jiang","doi":"10.1016/j.gsf.2025.102132","DOIUrl":"10.1016/j.gsf.2025.102132","url":null,"abstract":"<div><div>Microbially mediated carbon (C), nitrogen (N), and sulfur (S) metabolism are core biogeochemical drivers affecting arsenic (As) mobilization and transformation that regulate the formation of high-arsenic groundwater globally. This study determined the microbial molecular mechanisms driving As mobility via coupled C-N-S cycles in the Kuitun River Basin (Xinjiang, China). Metagenomic and geochemical analyses of high-As (HA; &gt;10 μg/L, <em>n</em> = 5) and low-As (LA; ≤10 μg/L, <em>n</em> = 6) samples revealed significant microbial community divergence (analysis of similarities <em>R</em> = 0.67, <em>P</em> = 0.003). Key differential genera included HA-enriched Candidatus <em>Kuenenia</em> and <em>Sulfuritalea</em> as well as the LA-enriched <em>Sphingobium</em> and <em>Novosphingobium</em>. Key functional genes exhibited contrasting As correlations, with negative correlations (<em>katE, cynT, ncd2, ssuABC,</em> and <em>dmdC</em>) in LA-dominant <em>Rhodopseudomonas/Hydrogenophaga/Acinetobacter</em> promoting As³⁺ oxidation, competitive inhibition of As⁵⁺ reduction, and As₂S₃ precipitation; positive correlations (<em>ACO</em>, <em>korA</em>, <em>hao</em>, <em>psrA</em>) in HA-associated Candidatus <em>Kuenenia</em> and <em>Thiobacillus</em> enhanced As⁵⁺ reduction, Fe/Mn oxide dissolution, and thioarsenate formation. <em>Rhodopseudomonas</em> in unconfined aquifers demonstrated a synergistic C-N-S network (<em>katE</em>-<em>ncd2</em>-<em>ssuABC</em>) for efficient As immobilization. These findings enhance the understanding of microbially driven As biogeochemical cycles and provide a theoretical foundation for developing <em>in situ</em> remediation technologies based on microbial metabolic regulation.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102132"},"PeriodicalIF":8.9,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The causal links between green energy, uncertainty, remittances, FDI, and ecological footprint: Evidence using structural breaks and multiple wavelet approach","authors":"Brayan Tillaguango ,&nbsp;Rafael Alvarado ,&nbsp;Abdul Rehman ,&nbsp;Cem Işık ,&nbsp;Muntasir Murshed","doi":"10.1016/j.gsf.2025.102131","DOIUrl":"10.1016/j.gsf.2025.102131","url":null,"abstract":"<div><div>Policies encouraging green energy adoption promote environmental sustainability, particularly in developing countries where the remittances boost household consumption. This research aims to empirically examine the impact of green energy, output, uncertainty, remittances, and Foreign Direct Investment (FDI) on the ecological footprint in Ecuador during 1990–2023. The research contributes to the green energy-environmental sustainability nexus debate by capturing the effect of external and internal shocks in the series and assessing the time–frequency dimension. This research is pioneering in examining the causal relationship between green energy, the uncertainty index, and the ecological footprint using combined cointegration and the multiple wavelet approach in the context of a remittance-dependent country. Notably, cointegration techniques with structural breaks, long-run elasticities using Dynamic Ordinary Least Square (DOLS), Fully Modified Ordinary Least Square (FMOLS), and Canonical Cointegrating Regression (CCR) models, partial and multiple wavelet analysis, and Fourier causality are used for estimation purposes. Accordingly, the results confirm cointegrating relationships in the presence of structural breaks among green energy, GDP, uncertainty, remittances, FDI, and environmental sustainability. Besides, it is found that output and uncertainty increase the ecological footprint, while remittances, FDI, and green energy reduce it. Hence, policymakers should consider remittances, FDI, and green energy as mechanisms to achieve Sustainable Development Goals (SDG) agenda so that environmental sustainability can be promoted in Ecuador.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102131"},"PeriodicalIF":8.9,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orbital forcing of Middle Miocene East Asian summer monsoon variability recorded by aeolian sediments on NE Tibetan Plateau","authors":"Akemu Saimaiti ,&nbsp;Chaofeng Fu ,&nbsp;Xiaoke Qiang ,&nbsp;Yougui Song ,&nbsp;Rui Zhang ,&nbsp;Peng Jia ,&nbsp;Beibei Zhang","doi":"10.1016/j.gsf.2025.102130","DOIUrl":"10.1016/j.gsf.2025.102130","url":null,"abstract":"<div><div>An accurate chrono-stratigraphy of aeolian sediments is crucial for understanding East Asian Summer Monsoon (EASM) variability. However, there are few studies of EASM variability recorded in aeolian sediments on the northeastern margin of the Tibetan Plateau, especially high-resolution aeolian sedimentary sequences spanning the period of 15–10 Ma. We studied an aeolian red clay section (89.1 m) with interbedded fluvial sediments, in the Jianzha Basin, northeastern Tibetan Plateau, using the integration of magneto stratigraphy, <em>cyclo</em>-stratigraphy, and detrital zircon provenance analysis. Magneto stratigraphy revealed 12 normal and 11 reverse polarity zones that are well correlated with chrons C5n.2n to C5Bn.2n of the Geomagnetic Polarity Time Scale (GPTS); this constrains the age of the section to the Middle Miocene. Subsequently, we use the frequency-dependent magnetic susceptibility as an EASM proxy, combined with spectral analysis in the depth domain, to identify Earth orbital periodicities. Gaussian band-pass filtering enabled us to extract the 405-kyr eccentricity signal, which provided a high-resolution astronomical time scale for the interval of 15.231–10.439 Ma. Detrital zircon U-Pb provenance tracing and sediment accumulation rate analysis revealed a provenance shift between 14.08 Ma and 10.2 Ma, which we attribute to the rapid uplift of the West Qinling Mountains at ∼ 13–12 Ma. The relationship between the variation of monsoon proxy indicators in the section and the global marine oxygen isotope (<em>δ</em>¹⁸O) record indicates that EASM evolution during the Middle Miocene was primarily a response to global temperature changes. On an orbital time scale, the frequency-dependent magnetic susceptibility record shows a significant long-eccentricity (∼405 kyr) periodicity component, indicating that EASM variations during the Middle Miocene were forced mainly by eccentricity. We conclude that a combination of eccentricity-modulated low-latitude summer insolation and Antarctic Ice Sheet fluctuations drove the eccentricity-paced precipitation variability on the northeastern Tibetan Plateau during the Middle Miocene.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 6","pages":"Article 102130"},"PeriodicalIF":8.9,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}