Geological Journal最新文献

{"title":"A Novel Approach for Reconstructing Hydrocarbon Generation Potential of Source Rocks: Through Thermal Simulation Experiments and Its Geological Implications","authors":"Hu Liu,&nbsp;Qinghua Peng,&nbsp;Yuan Xie,&nbsp;Taotao Cao,&nbsp;Jie Peng,&nbsp;Mei Yue,&nbsp;Xiaotong Liu,&nbsp;Wenbin Chen,&nbsp;Fei Sun","doi":"10.1002/gj.70128","DOIUrl":"https://doi.org/10.1002/gj.70128","url":null,"abstract":"<div>\u0000 \u0000 <p>Accurate reconstruction of the original hydrocarbon generation potential of source rocks is of paramount importance for petroleum exploration, reservoir development, and resource assessment. Due to the complex nature of hydrocarbon generation–expulsion processes and numerous influencing factors, conventional restoration methods frequently produce results with significant uncertainties. This study adopted pyrolysis data from systematic thermal simulation experiments to establish a comprehensive reconstruction methodology through rigorous piecewise interpolation analysis of diverse mudstone and shale samples. Controlled experimental simulations were performed on organic-rich samples from the North China, Sichuan, and Ordos Basins to obtain precise Rock-Eval parameters. A robust thermal evolution model was developed, utilizing hydrocarbon generation potential index (GPI) as the independent variable and vitrinite reflectance (<i>R</i>₀) as the dependent variable, which facilitated the classification of original hydrocarbon potential into six well-defined categories. Subsequently, mathematical models and correction formulas were derived for different kerogen types through quantitative analysis. Field validation demonstrates exceptional applicability in source rock evaluations for both the Sichuan and Qiangtang Basins, with assessment results exhibiting strong correlation with actual exploration data. The proposed methodology not only establishes standardized protocols for sample collection but also overcomes the limitations of traditional static parameter approaches, providing valuable applications for accurate evaluation of medium-to-low maturity source rocks and demonstrating significant potential for hydrocarbon resource assessment.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3093-3107"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of Chert in the Ordovician Carbonates in the Western Tarim Basin and Their Impact on Reservoir Quality: Constraints From Petrology and Geochemistry","authors":"Hui Zhou,&nbsp;Da Gao,&nbsp;Lili Huang,&nbsp;Tianfu Zhang,&nbsp;Yuanquan Zhou,&nbsp;Mengxin Zhou,&nbsp;Yangxiao Hu","doi":"10.1002/gj.70134","DOIUrl":"https://doi.org/10.1002/gj.70134","url":null,"abstract":"<div>\u0000 \u0000 <p>To investigate the formation of chert and silicified carbonates and their impact on reservoir quality in deep-buried strata, we conducted a detailed petrographic and geochemical study of the Lower Ordovician strata in the western Tarim Basin using both outcrop and drill core samples. Our analyses revealed various forms of chert, including nodules, brecciated cherts, replacive silica, and silica cements, indicating formation during late diagenesis. Petrographic observations show that replacive silica is commonly associated with coarse euhedral dolomite, suggesting an association with deep burial dolomitization. Significant dissolution vugs are observed in silicified carbonates, with visual porosity estimates reaching 15%–20%—significantly higher than the 2%–5% porosity typical of early diagenetic karstification. Geochemical results show Sm/Nd ratios of 0.11–0.32, similar to crustal materials, and chondrite-normalised REE patterns display right-dipping trends. The δ³⁰Si values range from 0.3‰ to 3.5‰, consistent with silicified precursor cherts and indicative of a magma-derived silicon-rich hydrothermal fluid origin. These fluids migrated along deep faults and fractures, facilitating silicification and extensive dissolution that considerably enhanced reservoir quality. This study provides diagnostic criteria and a genetic model for effective prediction of high-quality reservoirs in deep hydrothermal silicification systems, highlighting the importance of fault-controlled fluid activity for hydrocarbon exploration in deeply buried carbonates.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3186-3202"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lead (Pb) Geochemical Mapping Based on a Fixed-Value Method: A Case Illustration in Wenshan Area, Southwest China","authors":"Taotao Yan,&nbsp;Dawen Liu,&nbsp;Ye Liu,&nbsp;Shengchao Xu,&nbsp;Qingjie Gong","doi":"10.1002/gj.70133","DOIUrl":"https://doi.org/10.1002/gj.70133","url":null,"abstract":"<div>\u0000 \u0000 <p>An objective understanding of the spatial distribution of Pb concentrations is essential for the rational exploitation of resources and the effective assessment of environmental pollution. The geochemical map is an indispensable tool in mineral exploration and environmental assessment. A 19-level fixed-value method for contouring the geochemical map of Pb is proposed, which is based on various typical values of Pb concentrations, including analytical detection limit, abundance values of soils and stream sediments in China, risk screening values and intervention values for agricultural soils in China, and the cut-off grades of ore deposits. Based on 18 fixed values, Pb concentrations are divided into 19 levels and further categorised into six types. These six types are illustrated in the geochemical map in blue tone, yellow tone, pink tone, red tone, grey tone, and black colour, corresponding to low-background zones (level 1–5), high-background zones (level 6–9), maybe screening risk zones (level 10–12), surely screening risk zones (level 13–15), surely intervention risk zones (level 16–18), and mineralised zones (level 19), respectively. The method is applied in the Wenshan area of Yunnan Province, which is rich in Pb, Zn, and Sn metal resources. The results indicate that the Pb concentration in this area ranges from level 2 to level 19, with most belonging to the high-background zones. Low-background zones are closely related to the spatial distribution of low-Pb rocks in the region, while the zones in maybe screening risk, surely screening risk, intervention risk, and mineralised types coincide spatially with proven Pb-Zn deposits in the area. Geochemical maps generated by traditional cumulative frequency method rely on the existing Pb concentration data from samples, which limits the comparison across different elements and areas. In contrast, the proposed 19-level fixed-value method for Pb represents an objective and innovative approach that facilitates the comparison and provides robust support for mineral exploration and environmental assessment.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3173-3185"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oncoidal Facies Across the Carboniferous-Permian Transition (Hadim Nappe, Southern Türkiye): Paleoenvironmental Implications and Correlations","authors":"Melikan Akbaş","doi":"10.1002/gj.70157","DOIUrl":"https://doi.org/10.1002/gj.70157","url":null,"abstract":"<div>\u0000 \u0000 <p>The cortoid and/or oncoid-bearing carbonates of the <i>Girvanella</i> Limestone Facies of the Hadim Nappe that were deposited during the early–middle Gzhelian–middle Asselian time interval are represented by a succession that laterally extends over dozens of kilometres and is up to 60 m thick. This facies is easily distinguishable from the facies above and below and is considered a significant sedimentological marker unit by its lithological properties (e.g., brownish-red colour and large oncoids). Eight microfacies types are recognised from the <i>Girvanella</i> Limestone Facies: cortoid grainstone/floatstone, cortoid-bioclastic grainstone/rudstone, cortoid-aggregate grainstone, bioclastic grainstone to packstone, oncolite packstone/rudstone, oncoid grainstone/floatstone, mudstone/wackestone, and algal fenestral bindstone that are indicative of moderate to high-energy shallow marine carbonate platform settings (e.g., sand shoals and bank zone and lagoon–peritidal zone). Oncoid-bearing facies across the Carboniferous–Permian transition in the Hadim Nappe show a well correlation with similar deposits from South China, Iran, Mexico, Carnic Alps (Austria), and Japan. This widespread and synchronised deposition of the oncoid-bearing facies corresponds to the major phase (Glacial period III) of the Late Palaeozoic Gondwana glaciation and global sea-level drop associated with this glaciation.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3264-3282"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Impact of Differential Thermal Evolution on Coalbed Methane Accumulation of Upper Palaeozoic Strata in the Eastern Ordos Basin","authors":"Guo Sasa,&nbsp;Ren Zhanli,&nbsp;Qi Kai,&nbsp;Xing Guangyuan,&nbsp;Xu Chang","doi":"10.1002/gj.70124","DOIUrl":"https://doi.org/10.1002/gj.70124","url":null,"abstract":"<div>\u0000 \u0000 <p>The eastern Ordos Basin is rich in coalbed methane resources, with distinct accumulation and generation characteristics observed across different structural zones. Therefore, this study focuses on the eastern margin, utilizing vitrinite reflectance, geochemical parameters, and fluid inclusion thermometry data to reconstruct the thermal evolution history and simulate hydrocarbon generation. By comparing the differential evolution of Upper Palaeozoic coal seams in the eastern margin, it was found that the northern area was at a low-maturity stage in the Late Triassic, with limited hydrocarbon generation. The Early Cretaceous was the primary hydrocarbon generation period, with accumulation time occurring between 145 and 130 Ma. The peak hydrocarbon generation occurred at 140 Ma, but with relatively weak intensity, producing less than 0.01 Mtons. In contrast, the southern area's main reservoir formation period was between 135 and 120 Ma, reaching a peak hydrocarbon generation of 0.02 Mtons at 120 Ma. Overall, the hydrocarbon accumulation in the eastern margin of the basin occurred between 145 and 120 Ma. The geochemical characteristics of the coal-bearing source rocks show little variation, and the thermal evolution and hydrocarbon generation processes are similar. The quality of the source rock primarily affects hydrocarbon generation intensity, while the formation of coalbed gas is mainly constrained by structural thermal evolution. This study contributes to a deeper understanding of the thermal evolution and hydrocarbon generation processes of deep Upper Palaeozoic coal seams in the eastern margin of the Ordos Basin. It provides valuable insights for coalbed gas accumulation and prediction.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3021-3036"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated Petrophysical Analysis, Seismic Interpretation, and 3D Static Reservoir Modelling for Rock Typing and Geomechanical Characterisation of Cretaceous Reservoirs in the Arcadia and Dorra Oil Fields, Western Desert, Egypt","authors":"Mohamed Reda,&nbsp;Taher Mostafa,&nbsp;Mohamed I. Abdel-Fattah,&nbsp;Hamzah S. Amir,&nbsp;Mohammed A. Amir,&nbsp;Abdelmoneam Raef,&nbsp;Mohamed Fathy,&nbsp;Khaled Al-Kahtany,&nbsp;Sherif Farouk","doi":"10.1002/gj.70122","DOIUrl":"https://doi.org/10.1002/gj.70122","url":null,"abstract":"<div>\u0000 \u0000 <p>This study comprehensively evaluates the petrophysical properties and seismic characteristics of the Cretaceous reservoirs in the Arcadia and Dorra hydrocarbon oil fields in the Western Desert, Egypt. The focus is on the Alam El Bueib Formation, specifically its AEB-3D, AEB-3E and AEB-3G sub-members, which exhibit significant heterogeneity in lithology, comprising sandstone, limestone and shale. The analysis reveals that these sub-members have varying net pay thicknesses, effective porosity and hydrocarbon saturation levels. AEB-3D has a net pay thickness of 2–19 ft, a shale volume of 4%–24%, an effective porosity of 11%–17% and a hydrocarbon saturation of 55%–68%. AEB-3E shows a net pay thickness of 7–18 ft, a shale volume of 6%–16%, an effective porosity of 9%–15% and hydrocarbon saturation of 49%–64%. AEB-3G exhibits a net pay thickness of 10–43 ft, a shale volume of 4%–11%, an effective porosity of 9%–15% and hydrocarbon saturation of 46%–80%. Core data were utilised to validate the log-derived parameters, showing a strong correlation between log-derived and core-derived porosities (R² = 0.957). Four distinct rock geomechanical and flow types were identified, using techniques such as the Reservoir Quality Index (RQI), Flow Zone Indicator (FZI) and Hydraulic Flow Units (HFUs). This study also assesses the elastic moduli and rock strength parameters, revealing high variability across the formations due to lithological heterogeneity. The Abu Roash G Member was found to be the least stable, with a high Poisson's ratio, indicating lower stiffness. In contrast, the Bahariya Formation demonstrated moderate to high bulk moduli, suggesting better stability, while the AEB-3D Member showed the highest mechanical strength. Integrating well logs, seismic reflection data and geomechanical data enabled the construction of detailed 3D models, improving the reduction in drilling risk and the determination of reservoir petrophysical properties, thus informing future exploration and development strategies. The workflow presented in this study demonstrates the value of integrating petrophysical, geomechanical and seismic interpretation techniques to enhance understanding of reservoir quality controls. This approach is essential for developing target reservoirs in the study area and can be applied to similar geological settings elsewhere.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"2978-3004"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149099812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Devonian Back-Arc Extension at the Northern Margin of the North China Craton: Evidence From the Danaobao Alkaline Magmatism in the Shangyi Area","authors":"Yinchuan Wang,&nbsp;Zuochen Li,&nbsp;Xianzhi Pei,&nbsp;Ruiguang Wang,&nbsp;Yan Ai,&nbsp;Shaowei Zhao,&nbsp;Youxin Chen,&nbsp;Li Qin,&nbsp;Xiao Wang,&nbsp;Nan Hu","doi":"10.1002/gj.70132","DOIUrl":"https://doi.org/10.1002/gj.70132","url":null,"abstract":"<div>\u0000 \u0000 <p>Alkaline magmatic rocks from the Early-Middle Devonian are distributed linearly along the east–west trending Jining-Shangyi-Longhua Fault at the northern margin of the North China Craton (NCC). These rocks are associated with post-collision extension following the arc–continent collision between the Bainaimiao Island Arc and the NCC's northern margin. The affiliation of Late Devonian alkaline magmatic rocks with this tectonic system remains a subject for further investigation. A newly identified suite of Late Devonian alkaline intrusive rocks in the Xisai intrusive complex, Shangyi area, provides additional insights. Zircon U–Pb dating of the quartz monzonite yields an age of 380–377 Ma, confirming its Late Devonian age. Geochemically, these rocks are characterised by low silicon (SiO₂ = 60.21–67.19 wt.%), low Mg# values (9–18), Cr (2.08–26.70 ppm) Co (1.63–3.10 ppm) and Ni (1.40–11.00 ppm) content, high aluminium (Al₂O₃ = 16.28–21.03 wt.%), and elevated alkali content (K₂O + Na₂O = 8.54–10.17 wt.%). It is enriched in largeion lithophile elements such as Sr, Ba, Rb, La and Ce, and depleted in high-field-strength elements and heavy rare earth elements such as Nb, Ta, Zr, Hf, Y and Yb. The rock also displays a weak positive europium anomaly (<i>δ</i>Eu = 1.04–2.38). Zircon ε_Hf(<i>t</i>) values of the quartz monzonite range from −21.36 to −17.74, and the two-stage model age (t_DM2) spans 2701–2477 Ma. These values suggest protolith magma derived from ancient lower crust partial melting. Field observations reveal clear syn-intrusive extensional deformation. The research concludes that the Danaobao quartz monzonite formed at the Late Devonian back-arc extension associated with the subduction of the Paleo-Asian Ocean beneath the northern margin of the NCC.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3156-3172"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Outlook at Environmental Pollution Mitigation: A Deep Delve Into the Nexus Between Industrialization, Export Growth, Trade, and Clean Energy Use: Evidence From Industrialised and Export Driven Economies","authors":"Wan-Li Zhang,&nbsp;Gabriel Mordzifa Sackitey,&nbsp;Kamal Deen Moro,&nbsp;Festus Victor Bekun,&nbsp;Michael Provide Fumey,&nbsp;Alexander Opoku","doi":"10.1002/gj.70126","DOIUrl":"https://doi.org/10.1002/gj.70126","url":null,"abstract":"<div>\u0000 \u0000 <p>The call for the world to shift to clean energy use is increasing, with renewable energy sources accounting for over 29% of global power generation. The current study analyses the effects of industrialization, export expansion, trade, urbanisation, and clean energy use on environmental pollution in 10 largely industrialised and export-based economies: China, the USA, Japan, Germany, India, the UK, the Netherlands, Italy, France, and Russia, using 1990–2022 data. According to the Environmental Kuznets Curve (EKC) hypothesis, this paper confirms that industrialization and export expansion contributes to environment pollution because they increase CO₂ emissions and energy consumption. Urbanisation and trade also raise the pollution level. Using clean energy reduces ecological harm, since a 1% increase in clean energy use reduces the pollution rate by 0.28%. The study employs robust econometrics methods to validate the findings derived from the Driscoll–Kraay Standard Error model; fully modified ordinary least squares, dynamic ordinary least squares, and cross-sectional autoregressive distributed lag. The empirical evidence indicates that policy intervention, such as promoting green technology, stringent ecological controls, and providing incentives for renewable energy consumption, is implicated in reducing the environmental costs of export-led and industrial growth. This research offers policymakers an operations framework for sustainable economic development and reducing environmental pollution.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 10","pages":"3060-3078"},"PeriodicalIF":2.6,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149100377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unconformity Characteristics of Kunbei Fault Terrace Belt and Its Influence Factors on Petroleum Migration in the Southwestern Qaidam Basin, NW China","authors":"Yong Li,&nbsp;Jiaqi Han,&nbsp;Songbai Zhu,&nbsp;Xin He,&nbsp;Zhiming Xu,&nbsp;Zhenglu Xiao","doi":"10.1002/gj.70109","DOIUrl":"https://doi.org/10.1002/gj.70109","url":null,"abstract":"<div>\u0000 \u0000 <p>Hydrocarbon migration is a critical process controlling petroleum accumulation. Understanding the types and spatial distribution of hydrocarbon carrier systems is essential for deciphering migration pathways. This study integrates structural analysis of unconformities, core observations and geochemical tests to compare migration pathways of oils from different charging episodes and to elucidate the control mechanism of unconformities on hydrocarbon migration. The results indicate that: (1) The bedrock unconformity in the Kunbei fault terrace zone serves as the main conduit for lateral oil migration in the hanging wall of the fault. Its binary structure, consisting of ‘basal conglomerate + semi-weathered rock’, and variations in thickness spatially influence the transport capacity; (2) Reservoir bitumen exhibits a C₂₉ sterane predominance, low gammacerane index (&lt; 0.3) and relatively low sterane maturity parameters, indicating a low-maturity origin. In contrast, crude oil shows C₂₇ sterane predominance, higher gammacerane index and higher maturity parameters, suggesting distinct sources; (3) Two phases of accumulation are identified: bitumen formed during the first phase (early N₁) and is distributed near the unconformity, whereas crude oil formed during the second phase (late N₂), initially migrating laterally along the unconformity before being vertically adjusted through secondary faults and ultimately accumulating in bedrock, E_1 + 2 and E₃\u0000 ¹ formations. These findings provide theoretical guidance regarding the role of unconformities as critical carrier systems in controlling hydrocarbon migration and accumulation.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 9","pages":"2682-2702"},"PeriodicalIF":2.6,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genesis, Magmatic Process and Metallogenic Constraints on the Wudaoliuhe Intrusive Rocks in the Jiapigou Gold Mining District, Jilin Province: Evidence From Zircon U–Pb Geochronology and Element and Hf Isotope Geochemistry","authors":"Shu Wang,&nbsp;Jinggui Sun,&nbsp;Jilong Han,&nbsp;Xiaolei Chu,&nbsp;Xiaotian Zhang","doi":"10.1002/gj.70117","DOIUrl":"https://doi.org/10.1002/gj.70117","url":null,"abstract":"<div>\u0000 \u0000 <p>The Jiapigou area is a world-famous gold mining district. Recent studies have revealed that large-scale mineralization occurred between 180 and 172 Ma, which is temporally associated with the Wudaoliuhe intrusive rocks. The Wudaoliuhe intrusive rocks are mainly divided into two stages, including Early Jurassic monzogranite (stage I) and small amounts of Middle Jurassic diorite, granodiorite and monzogranite (stage II), which are present as stocks in the stage I monzogranite and Archean supracrustal rocks. Zircon U–Pb ages suggest that the magma emplacement of the stage I monzogranite occurred at 186.1 ± 1.2 Ma, whereas stage II diorite, granodiorite and monzogranite were emplaced at 176.3 ± 2.4 Ma, 175.0 ± 1.4 Ma and 174.4 ± 1.1 Ma, respectively. The geochemical characteristics reveal that stage I and monzogranite and stage II granodiorite and monzogranite have high SiO₂ and Al₂O₃ contents, low MgO, and CaO contents, A/CNK ratios (1.01–1.10), are enriched in LILEs and LREEs, depleted in HFSEs and HREEs and exhibit moderate negative Eu anomalies. The stage II diorite has high SiO₂, Al₂O₃, CaO and MgO contents, A/CNK ratios (0.93–0.96), is enriched in LILEs, lacks HFSEs and has significant Eu anomalies. The εHf(t) values of the stage I monzogranite are −5.5 to −11.3. The εHf(t) values of stage II diorite, granodiorite and monzogranite are −5.7 to −4.7, −6.9 to −9.7, and −7.7 to −10.4, respectively. These geochronology and geochemistry characteristics indicate that the deep geological process in the Early Jurassic was large-scale partial melting of the crust. With the evolution of the magma chamber and the addition of mantle-derived materials, some residual magma transformed into intermediate–basic magma. The magma intruded upwards and formed the stage II diorite, granodiorite and monzogranite. The large-scale mineralization in the Jiapigou mining district (JMD) coincided with an extensional-transition process triggered by the subduction of the palaeo-Pacific Ocean. The metallogenic process coincided with partial melting of the continental lower crust, and mantle-derived magma participated in the late stage of magma chamber evolution. These findings highlight that crustal partial melting and mantle-derived material input were critical factors controlling the large-scale Au mineralization in the JMD.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"61 9","pages":"2849-2874"},"PeriodicalIF":2.6,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}