Geological Journal最新文献

{"title":"A Review of the Cretaceous Ichnology of Tethys-Related Basins in India: New Record From the Bagh Group","authors":"Apurva D. Shitole,&nbsp;Satish J. Patel,&nbsp;Jehova Lalmalsawm Darngawn,&nbsp;Jaquilin K. Joseph","doi":"10.1002/gj.5139","DOIUrl":"https://doi.org/10.1002/gj.5139","url":null,"abstract":"<div>\u0000 \u0000 <p>The Narmada Basin in west-central India forms the northern part of the Central Indian Tectonic Zone (CITZ). The Cretaceous Bagh Group rocks of the Western Lower Narmada Valley (WLNV) succession was studied for sedimentary facies analysis and ichnology. Textural and mineralogical characteristics along with primary and secondary sedimentary structures revealed 11 lithofacies, of which the calcareous sandstone, fine-grained sandstone-siltstone-shale and sandy/silty allochemic limestone lithofacies are highly bioturbated. WLNV contains a well-preserved, less diverse, and relatively abundant ichnofauna; a total of 24 ichnospecies belonging to 15 ichnogenera with pseudotrace fossils are identified and described. The trace fossils belong to the <i>Skolithos</i>, <i>Cruziana</i> and <i>Glossifungites</i> Ichnofacies. The <i>Skolithos</i> Ichnofacies suggest an upper shoreface environment with moderate-to-high energy conditions and shifting substrate; the <i>Cruziana</i> Ichnofacies suggest a lower shoreface environment with low-to-moderate sedimentation rates and energy conditions and the <i>Glossifungites</i> Ichnofacies suggest dewatering of sediments and a slow rate of sedimentation. Early ichnological studies in the different Tethys-related Cretaceous basins of the Indian subcontinent (Eastern Lower Narmada Valley, Kachchh, Cauvery, Jaisalmer, Barmer and Saurashtra) primarily focused on identifying the trace fossils, describing the new species and interpreting them in relation to trace producers and depositional environment. However, many of the ichnogenera and ichnospecies established from these basins need special attention because they either have been described as invalid, revised or assigned an unclear taxonomic status. The Cretaceous trace fossils reported to date from these basins are compiled along with their paleoenvironmental interpretation. The study also discusses the present status of the ichnogenera and ichnospecies names of the trace fossils reported to date from these basins. These data can be further used to enhance our understanding of how paleoenvironmental conditions control the distribution of trace-making communities across space and time.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 6","pages":"1488-1514"},"PeriodicalIF":1.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206963","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":"Exploring the Impact of Ecological Degradation on the Green Development Efficiency: An Empirical Analysis Using the Novel Epsilon-Based Measure and Global Malmquist–Luenberger Index","authors":"Famanta Mahamane,&nbsp;Abid Ali Randhawa,&nbsp;Bilal Hussain,&nbsp;Javkhaa Tumennast,&nbsp;Abdelmohsen A. Nassani,&nbsp;Jamiatun Br Hombing,&nbsp;Cosimo Magazzino","doi":"10.1002/gj.5136","DOIUrl":"https://doi.org/10.1002/gj.5136","url":null,"abstract":"<div>\u0000 \u0000 <p>The profound consequences of ecological degradation on humanity's well-being are a severe matter acknowledged globally. This study examines the impact of ecological degradation on green development efficiency in less developed countries. A dataset from 1990 to 2020 was used to break down the impacts of ecological degradation on green development efficiency. Green development efficiency was calculated based on the epsilon-based measure model, while the dynamic change of green development efficiency was explored with the Global Malmquist-Luenberger Index model. The panel-corrected standard errors (PCSE) and feasible generalised least squares (FGLS) models are conducted to test the influence of ecological degradation on green development efficiency. The results show that ecological degradation inhibits green development efficiency, whereas green FDI, urbanisation, and economic growth benefit the increase of green development efficiency. In addition, government intervention shows a negative correlation with green development efficiency. The results of the spatial Durbin model (SDM) of green development efficiency also demonstrate an overall strong negative spatial spillover effect on local and neighbouring regions, with more significant effects at levels of the surroundings.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 6","pages":"1453-1473"},"PeriodicalIF":1.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206965","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":"Unravelling the Tectonic Nature of Charnockites Across the Highland and Wanni Complexes in Northeastern Sri Lanka: Implications for Demarcating Their Uncertain Lithotectonic Boundary","authors":"P. L. Dharmapriya,&nbsp;W. M. R. Jayathilake,&nbsp;Lei Zhao,&nbsp;Pahan Abewardana,&nbsp;R. Kleinschrodt,&nbsp;N. D. Subasinghe","doi":"10.1002/gj.5147","DOIUrl":"https://doi.org/10.1002/gj.5147","url":null,"abstract":"<div>\u0000 \u0000 <p>The tectonic evolution of terranes and microblocks is crucial for understanding the supercontinental cycle. Sri Lanka, centrally located between East and West Gondwana, offers insights into late Neoproterozoic continental tectonics. Ambiguities in defining boundaries between the Highland Complex (HC) and Wanni Complex (WC) of Sri Lanka prompted this study. Utilising whole-rock major and trace element geochemistry, and U–Pb zircon geochronology, we explore charnockites at the inferred HC-WC boundary, revealing their tectonic nature. Charnockites on the WC side (CWCs) display tholeiitic trends, characterised as Fe-rich, metaluminous A2-type granites. Tectonic discrimination diagrams position CWCs in the within-plate granite field. The ²³⁸U/²⁰⁶Pb zircon geochronology of three WC-side charnockites gave Late Neoproterozoic metamorphic ages from 576 ± 37 to 561 ± 50 Ma and middle to early Neoproterozoic protolith crystallisation ages from 1011 ± 46 to 690 ± 15 Ma. Hence, protoliths of CWCs suggest some form of extensional tectonics in a continental environment during the early to middle Neoproterozoic that played a major role in the crustal evolution of the northeastern part of the WC. Out of the collected seven charnockites in the HC side (CHCs), three samples shared geochemical signatures resembling the CWCs. The ²⁰⁶Pb/²³⁸U zircon ages of one of the samples yielded crystallisation age of ~780 ± 6 Ma and, metamorphic ages from 608 ± 9 to 541 ± 16 Ma, respectively. The rest of the CHCs exhibit calc-alkaline trend, identified as Mg-rich, metaluminous, I-type granites. Tectonic discrimination diagrams reveal volcanic arc signatures, indicating a subduction-related collisional tectonic setting. Geochemical and geochronological findings, coupled with field relations and prior research, lead to the interpretation that charnockites in the northeastern HC-WC boundary possess a distinctive geodynamic history, implying involvement in two distinct tectonic settings. Presently, at the erosion surface, the north-eastern portion of the HC-WC boundary, exhibits a highly diffused nature and manifests as a mixed rock zone.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 2","pages":"484-508"},"PeriodicalIF":1.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439034","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":"Eco-Transformation: Shaping the Future of Manufacturing With Green Technologies and Cleaner Production-Practices","authors":"Arsalan Zahid Piprani,&nbsp;Sajid Nazir,&nbsp;Wai Chuen Poon,&nbsp;Mahmood Ali,&nbsp;Shehnaz Tehseen","doi":"10.1002/gj.5137","DOIUrl":"https://doi.org/10.1002/gj.5137","url":null,"abstract":"<div>\u0000 \u0000 <p>In recent years, we have seen a manifold increase in natural calamities resulting from the continual degradation of our environment. The overuse of fossil fuels and other natural resources has contributed towards increasing global warming. This research investigates the environmental challenges posed by the overuse of natural resources and the subsequent carbon footprint. It emphasises the critical need for green technology and cleaner production practices to overcome environmental challenges. Focusing on developing countries, it investigates the effects of green technology and cleaner production-practices on energy efficiency, waste reduction and corporate sustainability in Pakistan's manufacturing industry. Through a cross-sectional analysis, it investigates the influence of sustainable practices on corporate sustainability in diverse manufacturing sectors. The findings reveal a positive correlation between the adoption of green technology and cleaner production-practices and a reduction in energy consumption, highlighting the significant role of resource commitment in enhancing the effectiveness of green technologies. However, the study notes a lack of significant impact of green technology on waste reduction and the broader concept of corporate sustainability, while cleaner production-practices show a beneficial influence on sustainability measures. This study contributes to the understanding of sustainable practices in emerging economies and underscores the importance of top management support and resource allocation in achieving environmental and economic sustainability goals.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 6","pages":"1474-1487"},"PeriodicalIF":1.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144207036","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":"Assessing Thermal Gradients Across Archean Stratigraphy Using Raman Spectra of Carbonaceous Material Thermometry and Mineral Chemistry in the Western Dharwar Craton, India","authors":"Lakshmanan Sreehari,&nbsp;Sasidharan Kiran,&nbsp;Tomokazu Hokada,&nbsp;Madhusoodhan Satish-Kumar,&nbsp;Tsuyoshi Toyoshima,&nbsp;Krishnan Sajeev,&nbsp;Perumal Rajkumar,&nbsp;Justin K. Antony","doi":"10.1002/gj.5135","DOIUrl":"https://doi.org/10.1002/gj.5135","url":null,"abstract":"<p>This study investigates the metamorphic evolution of the Chitradurga Schist Belt (CSB) in the Western Dharwar Craton, India, emphasising its relationship with tectonic processes. Due to the limited availability of ideal mineral assemblages for calculating metamorphic temperatures, we selected metasedimentary rocks containing carbonaceous material (CM) from each stratigraphic unit in the CSB to understand the tectono-metamorphic evolution. Raman spectra of carbonaceous material (RSCM) thermometry was integrated with mineral chemical analyses to elucidate the regional metamorphic conditions. These findings were then coupled with the microstructural evolution and deformation history of the CSB to clarify the tectonic evolution of the terrane. Our findings reveal a distinct metamorphic gradient, with the Bababudan Group exhibiting amphibolite-facies metamorphism at temperatures exceeding 500°C. Other stratigraphic units in the study area recorded greenschist-facies metamorphism at temperatures below 450°C. Detailed examinations of metamorphic mineral assemblages align with RSCM temperature estimates; hornblende is a major constituent in the Bababudan Group and is replaced by actinolite and chlorite during D₂ or D₃ deformation. Hydrous minerals such as muscovite and chlorite are distributed across all stratigraphic units, appearing along S₂ or S₃ foliation. The metamorphism in the Bababudan Group is likely linked to the early stages of collisional events/metamorphism of pre-rift sequences. In contrast, the pervasive hydration and lower-grade metamorphism are associated with the later stages of hinterland-thrust belt formation. This study highlights the significant influence of plate tectonic processes on regional-scale metamorphism and deformation in the Meso-Neoarchean Dharwar Craton.</p>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 2","pages":"560-581"},"PeriodicalIF":1.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/gj.5135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Identification of Astronomical Cycles in Fine-Grained Rocks and Their Application in High-Resolution Stratigraphic Correlation: A Case Study of the Fourth Member of the Shahejie Formation in the Leijia Area, Western Sag of the Liaohe Depression, China","authors":"Yang Li,&nbsp;Xiaoguang Li,&nbsp;Tingshan Zhang,&nbsp;Chang Chen,&nbsp;Jinpeng Li,&nbsp;Peng Lai,&nbsp;Yang Gao","doi":"10.1002/gj.5140","DOIUrl":"https://doi.org/10.1002/gj.5140","url":null,"abstract":"<div>\u0000 \u0000 <p>In the Western Sag of the Liaohe Depression within the Bohai Bay Basin, the fourth member of the Shahejie Formation (E₂s₄) in the Leijia area is characterised by lacustrine fine-grained sedimentary rocks, primarily composed of clay, felsic minerals, carbonates and analcime. These rocks serve as the key hydrocarbon reservoirs in the region. However, their complex lithology and rapid lateral variations lead to significant reservoir heterogeneity, posing challenges for the identification of favourable reservoirs. This study addresses these challenges through cyclostratigraphic analysis to enhance stratigraphic resolution and improve reservoir prediction. We employed time-series analysis, high-precision U–Pb carbonate dating and gamma ray (GR) logging data to identify astronomical cycles within the E₂s₄ fine-grained mixed rocks. Spectral analysis of GR data from wells lei93, lei37, lei53 and lei14 revealed signals consistent with standard eccentricity, obliquity and precession cycles. Using the 405 kyr long eccentricity cycle for astronomical tuning, we established a detailed chronostratigraphic framework for the E₂s₄, constrained by U–Pb dating results from several wells. In total, we identified six long eccentricity cycles (405 kyr) and approximately 19 short eccentricity cycles (~129 kyr). The correlation between Earth's orbital cycles and high-frequency sequences allowed us to construct a refined stratigraphic division and correlation framework at an eccentricity timescale. This refined framework offers a clearer understanding of reservoir distribution, greatly enhancing hydrocarbon exploration accuracy in the Leijia area. Moreover, our findings highlight the significant role of cyclostratigraphy in guiding future oil and gas exploration efforts in the Bohai Bay Basin, showcasing its potential application in broader geological contexts.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 6","pages":"1515-1531"},"PeriodicalIF":1.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144207011","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 Triassic to Jurassic Tectonic Evolution of the Northern Sichuan Foreland Basin, South China Craton","authors":"Can Xiong,&nbsp;Xiangyang Yang,&nbsp;Yunpeng Dong,&nbsp;Ming Xiao,&nbsp;Zhaoying Wei,&nbsp;Yanbo Feng,&nbsp;Jiaopeng Sun,&nbsp;Lingzi Xiang,&nbsp;Lin Yu,&nbsp;Songlin Xie,&nbsp;Cuifang Wang,&nbsp;Songlin Zhang","doi":"10.1002/gj.5131","DOIUrl":"https://doi.org/10.1002/gj.5131","url":null,"abstract":"<div>\u0000 \u0000 <p>The Northern Sichuan Foreland Basin, which is located in the northwest of South China Craton (SCC), was formed by the intracontinental thrusting between the Qinling Orogenic Belt (QOB) and SCC. The Upper Triassic to Jurassic sedimentary successions within this foreland basin, contain crucial information for revealing the intracontinental deformation sequence between the QOB and the SCC. In this study, based on a systematic dataset, including the palaeocurrent orientation, sandstone modal composition, and detrital zircons U–Pb age data, we attempt to reveal the tectonic processes during the Late Triassic to Jurassic interval. The palaeocurrent orientations, which is primarily directed in the southward and northwestward directions, indicate that the sediments were sourced from the north and southeast. The sandstone clastic components reveal multiple sources, including the magmatic arc and continental crust. Detrital zircons from six samples yield six major U–Pb age groups, including 2650–2350, 2050–1720, 1000–620, 520–380, 350–210, and 205–160 Ma. The Upper Triassic sediments contain a relatively high density of 2490, 1860, 810, 440, and 230 Ma, which are mostly consistent with the QOB, northern SCC and Jiangnan Suture Zone provenances. The majority age population of 2050–1750 Ma observed within the Xujiahe Formation, is considered to be primarily sourced from northern SCC, suggesting the uplift and erosion of the northern SCC, probably imply extreme shortening between the QOB and SCC. The Baitianba and Xintiangou formations, which contain lesser 2050–1720 Ma aged zircons, indicate a period of lacustrine expansion and tectonic quiescence after the shortening. The Middle Jurassic Shaximiao Formation, and the Upper Jurassic Suining and Penglaizhen formations, involve a major age population of 2050–1720 Ma that were sourced from northern SCC, indicate another phase of uplifting of the northern SCC related to a second stage of extreme intracontinental shortening and deformation between the SCC and the QOB. In summary, the above results indicate that, an initial phase of extensive shortening between the QOB and the SCC during the Late Triassic, was followed by a period of tectonic quiescence during the Early Jurassic, and another phase of extreme intracontinental shortening between the QOB and SCC during the Middle to Late Jurassic.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 2","pages":"531-559"},"PeriodicalIF":1.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439231","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":"Ce-Yb Fingerprinting of Phanerozoic Volcanic Rocks and Its Applicability to Some Archean Greenstone Belt Magmas","authors":"Subarna Baidya,&nbsp;Rajagopal Anand,&nbsp;Swayoma Bose,&nbsp;Nongmaithem Lakhan Singh","doi":"10.1002/gj.5126","DOIUrl":"https://doi.org/10.1002/gj.5126","url":null,"abstract":"<div>\u0000 \u0000 <p>Rare earth element fractionation in volcanic rocks can be used to recognise both petrogenetic processes and tectonic settings. We present a simple geochemical modelling approach using Ce<span></span>Yb proxy employing the Magma Chamber Simulator tool and the binary mixing model to understand the range and the limits of variation in the enrichment of incompatible trace elements, brought about in evolved magmas by differentiation processes in known Phanerozoic tectonic settings in conjunction with the Th<span></span>Nb<span></span>Yb proxy. By extending this approach to the volcanic rocks of the Meso-Neoarchean greenstone belts it is observed that rocks, which fall beyond the limits set by binary mixing and fractional crystallisation in a bivariant trace element plot were most likely generated by the modification of the mantle source by subducting slab-derived fluids prior to the melting of the source and the diversification of the magmas into differentiated rocks. Subduction–accretion process was established at least by the Meso-Neoarchean. The greenstone belts of the Dharwar and Yilgarn cratons represent Archean analogues of oceanic crust that were predominantly emplaced in a convergent-margin tectonic setting and probably acted as suture zones that juxtaposed continental crustal masses by horizontal tectonic forces.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 2","pages":"509-530"},"PeriodicalIF":1.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438736","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":"Discovery and Significance of the Neoproterozoic Gabbro Intrusion in the Bayan Obo Group Along the Northern Margin of the North China Craton","authors":"Hao Hu,&nbsp;Yuan Li,&nbsp;Zhiguang Zhou,&nbsp;Guosheng Wang,&nbsp;Shen Gao,&nbsp;Jianfeng Chen,&nbsp;Chenfei Feng","doi":"10.1002/gj.5132","DOIUrl":"https://doi.org/10.1002/gj.5132","url":null,"abstract":"<div>\u0000 \u0000 <p>The tectonic position of the North China Craton within the Rodinia supercontinent remain unclear due to the scarcity of early Neoproterozoic magmatic rocks in the region, resulting in limited paleomagnetic data. In this study, we report the discovery of a Neoproterozoic metamorphic gabbro intrusion within the Bayan Obo Group, located in the northwestern Bayan Obo rift zone at the northern margin of the North China Craton. This finding offers crucial geological insights into addressing this key scientific question. We utilised petrography, whole-rock geochemistry, zircon U–Pb geochronology, and Sr-Nd isotopic analysis to investigate the genesis and source of the gabbroic rock and its tectonic setting. The metamorphosed gabbro has a zircon ²⁰⁶Pb/²³⁸U weighted mean age of 925.9 ± 7.2 Ma, with low SiO₂ (46.46%–48.28%), high Na₂O (2.95%–3.56%), and low K₂O (0.761%–1.41%), and has the signature of sub-alkaline tholeiitic basalt. It is enriched in large-ion lithophile elements (Rb, Ba, Th, U, K, Pb) and depleted in high-field-strength elements (Nb, Ta). The rock is also enriched in light rare earth elements, shows a negative Eu anomaly, and has a positive <i>ε</i>Nd(<i>t</i>) value (+0.1 ~ +0.8). The metamorphosed gabbro shares geochemical characteristics and Nd isotopic compositions with contemporaneous mafic intrusions, including the 945–890 Ma mafic sills in southeastern North China Craton, the ~925 Ma Dashigou mafic dike swarm in central North China Craton, the ~925 Ma gabbro in Guyang, northern North China Craton, and the 827–819 Ma gabbro in Langshan, western North China Craton. This age suggests that the gabbro may represent a response to a large-scale mafic magmatic event in central-eastern North China Craton during the early Neoproterozoic, potentially linked to the initial breakup of the Rodinia supercontinent.</p>\u0000 </div>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 6","pages":"1409-1430"},"PeriodicalIF":1.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144207002","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":"Petrogenesis and Tectonic Setting of the Xishan Pluton in Nanling Range: Lithogeochemistry, Zircon U–Pb Chronology and Hf Isotope Evidence","authors":"Jianfeng Li,&nbsp;Wei Yang,&nbsp;Jianming Fu,&nbsp;Youyue Lu,&nbsp;Shunbo Cheng,&nbsp;Zhengwei Qin","doi":"10.1002/gj.5096","DOIUrl":"https://doi.org/10.1002/gj.5096","url":null,"abstract":"<p>In this article, a systematic LA-ICP-MS zircon U–Pb geochronology study was carried out on the Xishan pluton in Nanling Range. The results show that the formation ages of granitic porphyroclastic lava, medium-fine-grained porphyritic granite, and dacite are 154.0 ± 1.2–156.1 ± 2.0, 153.2 ± 0.9–157.3 ± 3.2, and 151.2 ± 3.1 Ma, which are determined to be the early Yanshanian. Geochemical data show that the Xishan pluton was characterised by rich silicone-alkali and poor calcium–magnesium with K₂O/Na₂O ratios of 1.65–2.22, Al₂O₃ of 1.00–1.14, and FeO*/MgO ratios of 8.33–19.0 (with an average of 12.94). The rare earth content of granites ranges from 322.92 to 441.54 ppm, which is significantly higher than the world average. The rare earth element distribution curve is right-leaning light rare earth enrichment type, with obvious negative europium anomaly, and the δEu values range from 0.06 to 0.24; These rocks are enriched in high-field-strength elements (HFSEs, e.g., Ga, Y, Nb, Zr, and Hf) and depleted elements such as Ba, Nd, Sr, P, Ti, etc, with Ga/Al ratios of 2.95 × 10⁻⁴ to 4.59 × 10⁻⁴ (with an average of 3.50 × 10⁻⁴); Zr + Nb + Ce + Y of 367.1–652.5 ppm (with an average of 441.95 ppm) and zircon saturation temperatures Tzr is 755.04°C–892.50°C (with an average of 810.04°C), similar to geochemical features of A-type granites. The Hf isotope study shows that the <i>ε</i>\u0000 _Hf(<i>t</i>) of the Xishan pluton ranges from 2.11 to −8.77, and the petrographic, geochemical and available data confirm that it originates from the mixing of crustal and mantle-derived magma, and the contribution of the latter is &lt; 10%. The hafnium II model age of the Xishan pluton is 1251–1766 Ma, which confirms that its source rocks were detached from the mantle reservoir at the time of the Middle Proterozoic. Combined with the evolutionary history of the Nanling Range area, it is assumed that the Jiangnan Orogenic Zone was partially reactivated by the continuous lateral subduction of the ancient Pacific Plate in the Late Mesozoic, which triggered partial melting of the crust to form the A₂-type granite type, which is the origin of the Xishan pluton.</p>","PeriodicalId":12784,"journal":{"name":"Geological Journal","volume":"60 3","pages":"674-699"},"PeriodicalIF":1.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530787","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}