Journal of Asian Earth Sciences最新文献

{"title":"The petrogenesis of plagiogranite of the Erenhot Ophiolite in the eastern Central Asian Orogenic Belt: A zircon Hf-O isotopic and whole-rock geochemical perspective","authors":"Peipei Zhao ,&nbsp;Lu Yin ,&nbsp;Yin Xu ,&nbsp;Zhiwei Wang ,&nbsp;Yanhai Yang ,&nbsp;Zhenning Yang ,&nbsp;Yuxin Sun ,&nbsp;Zhenyu Liu ,&nbsp;Liyang Zhang ,&nbsp;Bei Xu","doi":"10.1016/j.jseaes.2025.106568","DOIUrl":"10.1016/j.jseaes.2025.106568","url":null,"abstract":"<div><div>Plagiogranite in ophiolite can provide invaluable insights into its origin, magma evolution, and the evolution of oceanic crust. In this study, we conducted a systematic investigation of the zircon U–Pb–Hf–O isotopes, whole-rock geochemistry, and REE modelling of the Early Carboniferous plagiogranites in the Erenhot Ophiolite, the eastern part of the Hegenshan–Erenhot Ophiolite Belt. The newly obtained zircon U–Pb dating results indicate that the Erenhot plagiogranite was formed between 351 Ma and 348 Ma, akin to the Early Carboniferous plagiogranite in Hegenshan Ophiolite. The 348–390 Ma zircons in the plagiogranites are predominantly zircons of an oceanic crust origin, exhibiting radioactive Hf isotopes (εHf(t) of 15.2 to 19.9) and low δ¹⁸O values (+2.43 ‰ to +5.00 ‰), indicating that the Hegenshan Ocean likely opened prior to 390 Ma. The Erenhot plagiogranites exhibit low TiO₂ (0.09–0.29 wt%), K₂O (0.01–0.31 wt%) contents, along with relatively constant La with varying SiO₂ contents. Combined with REE modelling, zircon Hf–O isotopes, and ΔFMQ (&gt;0), these features suggest that the plagiogranite originated from the remelting of high-temperature hydrothermally altered gabbro in the younger lower oceanic crust with a highly depleted mantle source, under a relatively oxidizing environment. Significant variations in many major elements and their systematic changes with SiO₂, along with diverse Eu and Sr anomalies and REE modelling results, suggest that the parental magma of the plagiogranite underwent two stages of mineral fractional crystallization: first involving clinopyroxene, amphibole, and Ti- magnetite crystallization, followed by plagioclase accumulation and crystallization of amphibole and Ti- magnetite. The enrichment in LREEs, Rb, Ba, Th, and U, depletion in Nb, Ta, and Ti of plagiogranites and gabbros in the ophiolite, and the similar Ordovician–Silurian arc magmatic rocks in the two sides of the Hegenshan–Erenhot Ophiolite Belt, indicate that Hegenshan Ocean likely opened at a pre-existing back-arc basin, with deep mantle upwelling promoting oceanic crust extension.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"285 ","pages":"Article 106568"},"PeriodicalIF":2.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectono-thermal evolution of the Kanggur-Huangshan shear zone, Chinese Tianshan: Insights from integrated geochronology and thermochronology","authors":"Meng Luo ,&nbsp;Zhiyuan He ,&nbsp;Fujun Wang ,&nbsp;Yueqiao Zhang ,&nbsp;Jianzhang Pang ,&nbsp;Ying Wang ,&nbsp;Ying Wu ,&nbsp;Bihai Zheng ,&nbsp;Johan De Grave ,&nbsp;Wenbin Zhu","doi":"10.1016/j.jseaes.2025.106560","DOIUrl":"10.1016/j.jseaes.2025.106560","url":null,"abstract":"<div><div>Integrated geo-thermochronometry with structural analysis provide insights into the deformation and exhumation processes within the Kanggur-Huangshan shear zone (KHSZ), a significant transcurrent strike-slip fault and metallogenic belt in the Eastern Tianshan orogenic belt (Central Asia). Previous studies have primarily focused on structural, geochronological and geochemical aspects, often overlooking the exhumation dynamics. This study employs zircon U-Pb, (U-Th)/He (ZHe), apatite fission track (AFT) and (U-Th)/He (AHe) dating alongside field observations and microstructural analysis to elucidate the unroofing processes in the western KHSZ. New zircon U-Pb ages ranging from 280 to 260 Ma and U-Th/He age between 215 and 180 Ma for synkinematic rock, combined with published Ar/Ar data, indicate rapid post-magmatic cooling and shearing in an extensional setting. Subsequently, the region underwent tectonic inversion to transpression and exhumation, with blocks inside the shear zone experiencing more exhumation and forming the positive-flower structures until ca. 200 Ma. Late Jurassic to earliest Cretaceous AFT ages (165–145 Ma) and overlapping AHe ages (155–145 Ma) suggest rapid cooling after differential Jurassic burial, followed by a gradual exhumation of the samples to near-surface levels. A synthesis of existing data indicates that moderate Mesozoic cooling, coupled with Jurassic reburial and Cretaceous-Cenozoic tectonic quiescence, is characteristic of the western KHSZ. This geological history is crucial for understanding the preservation of porphyry Cu deposits as well as epithermal gold and Fe-Cu deposits in the region.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"285 ","pages":"Article 106560"},"PeriodicalIF":2.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sector-zoned clinopyroxene in alkaline basalts: insights from the Cenozoic Gelaoshan volcano, Datong Volcanic Field, North China Craton","authors":"Shuojin Chen,&nbsp;Meng Wang,&nbsp;Tong Hou,&nbsp;Xudong Wang","doi":"10.1016/j.jseaes.2025.106562","DOIUrl":"10.1016/j.jseaes.2025.106562","url":null,"abstract":"<div><div>Sector-zoned clinopyroxene records varying degrees of magma undercooling (ΔT = T_liquidus − T_{crystallisation}), which can be utilized to track the dynamics of magma plumbing systems. Nevertheless, the mechanism controlling element partitioning among different sectors are poorly constrained. The alkaline basalts erupted at Gelaoshan volcano in the Datong Volcanic Field (DVF) are characterized by the presence of sector-zoned clinopyroxene phenocrysts. Here we combined petrography and mineral chemistry to represent the partitioning of elements within sector-zoned clinopyroxene and their effect on the P-T estimation based on Cpx-only thermobarometer. Our results show that sector-zoned clinopyroxene indicates an undercooling degree of ∼ 36 °C. Through the trend of the different elemental partition coefficients of each pyroxene from core to rim, we had shown that in addition to undercooling, the trace element partitioning is also affected by primitive magma replenishment, diffusion rates of various elements within the clinopyroxene lattice and the mechanisms of charge balance. Moreover, sector-zonation affects the application of Cpx-only thermobarometers, and <!--> <!--> <!--> <!-->{-111} sectors could give reliable estimation results because of the clinopyroxene-melt equilibrium test. Hence, based on the composition of the <!--> <!--> <!--> <!-->{-111} sectors, we estimated the P-T conditions of Gelaoshan Cpx. Our results indicate the existence of two magma chambers within the volcanic plumbing system beneath Gelaoshan, one is at ∼ 25 km, with the other at ∼ 15 km.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"285 ","pages":"Article 106562"},"PeriodicalIF":2.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 history and mechanism of southeastward extrusion and exhumation of the Tibetan Plateau lithosphere","authors":"Limin Wu ,&nbsp;Guochun Zhao ,&nbsp;Weiming Fan ,&nbsp;Touping Peng ,&nbsp;Jianfeng Gao ,&nbsp;Xiaoming Shen ,&nbsp;Xiaohan Dong ,&nbsp;Shili Peng ,&nbsp;Yongmin Liu ,&nbsp;Dongyu Liao ,&nbsp;Aimei Zhang","doi":"10.1016/j.jseaes.2025.106559","DOIUrl":"10.1016/j.jseaes.2025.106559","url":null,"abstract":"<div><div>When and how the plateau lithosphere commenced to expand southeastwards and then induced the fast uplift and exhumation in the SE Tibetan Plateau during the India − Asia collision remain controversial. Here we present zircon U-Pb, mica Ar-Ar, and apatite (U-Th)/He and fission track ages of the granites together with kinematic observations in the Nujiang tectonic zone of the SE Tibetan Plateau. An integrated analysis indicates the earliest pulse of shearing strike slip induced by the southeastward lithospheric expansion in the SE Tibetan Plateau and the establishment of tectonic framework of the SE Tibetan Plateau during 45 − 40 Ma. In addition, the SE Tibetan Plateau, from south to north, had experienced the differential extrusion and uplift during the early Miocene to Pliocene. An integrated analysis suggests that the south and north SE Tibetan Plateau (the boundary line at ca. 26°N) stopped growth at Middle Miocene and Pliocene, respectively. This study provides the most detailed resolution for the southeastward expanding processes of the plateau lithosphere and the exhumation mechanisms of the SE Tibetan Plateau during Cenozoic times to date.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"285 ","pages":"Article 106559"},"PeriodicalIF":2.7,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regional-scale exploration targeting of REEs associated with Kiruna-type Iron Oxide-Apatite mineralization in the Bafq-Saghand metallogenic province, Central Iran","authors":"Majid Keykhay-Hosseinpoor ,&nbsp;Alok Porwal ,&nbsp;R. Kalimuthu","doi":"10.1016/j.jseaes.2025.106551","DOIUrl":"10.1016/j.jseaes.2025.106551","url":null,"abstract":"<div><div>The Bafq-Saghand metallogenic province, situated in the Central Iranian geo-structural zone, hosts world-class Kiruna-type Iron Oxide-Apatite (IOA) deposits, accompanied by local Rare Earth Elements-Uranium-Thorium (REEs–U–Th) enrichment. Its favorable geological setting holds significant potential for the discovery of REEs mineralization. However, the processes governing the formation, development and preservation of REEs are inadequately understood. Recognizing the processes leading to REEs formation and mapping their spatial expressions are crucial factors for mineral prospectivity mapping and subsequent exploration activities. This research aims to delineate exploration targets for REEs associated with IOA deposits, employing a Mamdani-type fuzzy inference system (FIS) technique and concentration–area fractal method. The regional-scale targeting criteria for IOA-associated REEs deposits were identified using mineral systems approach. The inputs for the mineral prospectivity model were the spatial proxies derived from geoscientific datasets comprising geological, remote sensing, geophysical, and geochemical data. The output prospectivity map highlights high-prospectivity REEs target areas covering approximately 10% of the entire region, displaying an NNW-SSE trending pattern similar to the crustal faults of the region, mainly associated with metasomatized acidic volcanic and metamorphosed volcanic rock units. This research led to identification of prospective target areas, where detailed project-scale exploration study is recommended and the demonstrated strategy in this research can be applied to demarcate exploration targets in similar geological terranes elsewhere.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"284 ","pages":"Article 106551"},"PeriodicalIF":2.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 geothermal regime of the Junggar Basin, northwest China: Implication for hydrocarbon distribution and geothermal resources","authors":"Chenxing Li ,&nbsp;Jian Chang ,&nbsp;Nansheng Qiu ,&nbsp;Huajun Guo ,&nbsp;Xiang Shan ,&nbsp;Bo Peng ,&nbsp;Jiabo Xu ,&nbsp;Ze Zhang","doi":"10.1016/j.jseaes.2025.106540","DOIUrl":"10.1016/j.jseaes.2025.106540","url":null,"abstract":"<div><div>The geothermal regime not only reflects the basin’s evolutionary history but also controls the formation of both fossil energy and geothermal resources. The deep geothermal characteristics of the Junggar Basin in northwestern China have remained unclear due to limited temperature data. In this study, we collected new temperature data from over 450 boreholes drilled in the past decade to investigate the geothermal gradient, heat flow, formation temperatures at depths of 5 to 10 km, and the thermal structure of lithosphere. The results show that the geothermal gradient ranges from 14.0 to 29.8℃/km, with an average of 20.7℃/km, and heat flow ranges from 32.7 and 68.5 mW/m², averaging 45.8 mW/m². Heat flow varies between uplifts and depressions, influenced by basement relief, with further regional variation in the north and south due to basement lithology and faults. The ratio of crust to mantle heat flow and the thermal lithosphere thickness across different tectonic units ranges from 0.74 to 1.92 and 150 to 270 km, respectively, confirming the basin’s stable tectonic background. Formation temperatures at 10 km depth ranges from 155℃ to 311℃, increasing from the center to the basin’s margins. These findings suggest that oil can be found at depths of 8000 m in the Central Depression, while high-temperature geothermal resources are present around 5000 m in the Eastern Uplift. This study provides a comprehensive understanding of the geothermal regime and valuable insights for future resource exploration in the Junggar Basin.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"284 ","pages":"Article 106540"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New insights into the provenance and tectonic evolution of the Paleoproterozoic Aravalli Basin, NW India","authors":"Parampreet Kaur,&nbsp;Prabhakar Dutta,&nbsp;Manisha,&nbsp;Naveen Chaudhri","doi":"10.1016/j.jseaes.2025.106541","DOIUrl":"10.1016/j.jseaes.2025.106541","url":null,"abstract":"<div><div>The tectonic setting of the Paleoproterozoic Aravalli Basin remains a subject of debate, primarily due to limited geochemical data, which complicates the establishment of a definitive stratigraphic framework and geodynamic evolution model for the Aravalli orogen. New petrological and geochemical data of the clastic (meta)sedimentary rocks, including quartzite, wacke and metapelites, have been used to reconstruct the sedimentary provenance and tectonic evolution of the Aravalli Basin. The Aravalli quartzites show quartz dilution, most likely representing a recycled sedimentary source without any significant heavy mineral addition. In contrast, the geochemical compositions of the wackes and metapelites do not suggest any significant sedimentary sorting and reflect the chemical characteristics of the source rocks. Weathering trends in the A-CN-K diagram indicate predominantly low to moderate weathering in the source area. Some samples deviate from the predicted weathering trend, reflecting plagioclase alteration to illite (now muscovite) or K-feldspar due to post-depositional K-metasomatism. The elemental ratios (Th/Sc, Zr/Sc and TiO₂/Zr) indicate that the detritus for the Aravalli sediments was largely sourced from the felsic igneous rocks. The results of REE modelling suggest that late Neoarchean (2.57–2.50 Ga) and late Paleoproterozoic (1.88–1.70 Ga) granitoids exposed in the Aravalli orogen and the adjacent Bundelkhand Craton constituted the dominant potential source rocks for the Aravalli sediments. The integration of new results, with the previously obtained igneous and detrital zircon U-Pb ages, constrain the deposition of Aravalli (meta)sedimentary sequence in a passive margin setting at &lt;1.74–1.60 Ga.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"284 ","pages":"Article 106541"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagenetic and mineralogical impacts on clastic reservoir; A case study from the lower Indus Basin, Pakistan","authors":"Muhammad Nofal Munir ,&nbsp;Mohammad Zafar ,&nbsp;Muhsan Ehsan ,&nbsp;Rujun Chen ,&nbsp;Kamal Abdelrahman ,&nbsp;Jar Ullah ,&nbsp;Tassawar Hayat ,&nbsp;Hamad Ur Rahim","doi":"10.1016/j.jseaes.2025.106539","DOIUrl":"10.1016/j.jseaes.2025.106539","url":null,"abstract":"<div><div>The Pab Sandstone, a significant and heterogeneous hydrocarbon development target in Pakistan’s Lower Indus Basin, offers a unique opportunity to investigate diagenetic and depositional controls on reservoir quality. A substantial uncertainty in reservoir quality assessment pertains to diagenetic effects. An integrated approach, including detailed petrographic analysis, scanning electron microscopy, X-ray diffraction, helium porosity, and permeability measurements, was used to analyze the impact of identified diagenetic elements on reservoir quality. Visual core investigations show deposition within a semi-arid, highly sand-prone coastal–alluvial braided plain under the periodic weak marine influence. The presence of trough-shaped crossbedding, large bedform structures, bioturbation, and some fossils in selective horizons indicate near-shore channel environments. The channel sandstones range from very fine to very coarse-grained quartz arenites. Analysis of some core samples shows an abundance of quartz arenites and kaolinite as the major authigenic clay minerals. Core-derived porosity and permeability were found to be 6.34 % and 69.90 mD, respectively. Main diagenetic processes include compaction, quartz overgrowth, calcite cementation, and authigenic kaolinite. Reservoir properties are strongly facies-dependent and are related to depositional texture, detrital mineralogy, together with their diagenetic overprint. Sandstones are typically very clean, with secondary porosity, which is associated with partial leaching of mudclasts, feldspars, and dissolution of volcanic rock fragments. Permeability exhibits a positive correlation with increasing grain size in the quartzose sandstones. Porosity decreases with poorer sorting. The research findings can be utilized to understand the complications of sandstone reservoirs and develop better exploration strategies minimizing the economic losses associated with non-productive wells.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106539"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural controls on the magma emplacement and distribution of sulfide orebodies in the Kalatongke Cu-Ni sulfide district, NW China","authors":"Xue-Hai Wang ,&nbsp;Ke-Zhang Qin ,&nbsp;Xing-Wang Xu ,&nbsp;Dong-Mei Tang ,&nbsp;Ya-Jing Mao ,&nbsp;Lei Zhang ,&nbsp;Min-Qiang Zhang ,&nbsp;Fang-Lin Yuan ,&nbsp;Yi Li","doi":"10.1016/j.jseaes.2025.106538","DOIUrl":"10.1016/j.jseaes.2025.106538","url":null,"abstract":"<div><div>Recent advances have significantly enhanced our understanding of the magma source, magma evolution, and sulfur saturation mechanisms of the Kalatongke Cu-Ni sulfide deposit in the Central Asian Orogenic Belt. However, limited systematic research has explored the structures that are critical to magma emplacement and sulfide accumulation. In this study, we perform a systematic multiscale analysis of the lithofacies distribution, morphology, and structural relationships between the northern and southern belts of the Kalatongke deposit. We propose that the emplacement and distribution of mafic intrusions and associated sulfide orebodies were controlled by fractures through <em>syn</em>-dextral shear deformation. The geometry of the Y1 and western Y2 intrusions and their mineralization were predominantly controlled by extensional T-fractures resulting from <em>syn</em>-shear deformation, whereas the eastern Y2 and Y3 intrusions were primarily governed by horizontal compressive-slip C-fractures, along with Riedel R and R’ fractures. In the northern belt, the Y7 intrusion and its mineralization were influenced by shear between two sets of horizontal fractures trending northeast, which are nearly perpendicular to the main fault orientation of the southern and northern belts. Based on the characteristics of the fractures and the distribution of orebodies across the northern and southern belts, we propose that the Kalatongke deposit was controlled by a negative flower structure, suggesting the presence of deep structural connectivity between the northern and southern belts. Moreover, the distribution pattern of the sulfide orebodies in the Kalatongke deposit was governed primarily by the structures and their associated stress regimes.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106538"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 of Jurassic granitoids from the Yanshan orogenic belt: Implications for crustal evolution in the northern North China Craton","authors":"Zeguang Chang ,&nbsp;Guochen Dong ,&nbsp;Xuanxue Mo ,&nbsp;Guang Miao ,&nbsp;Zhiwei Shi","doi":"10.1016/j.jseaes.2025.106535","DOIUrl":"10.1016/j.jseaes.2025.106535","url":null,"abstract":"<div><div>This study presents new geochronological and geochemical data for the Wangpingshi granite (WG) and Yuerya granite (YG) from the Yanshan orogenic belt, aiming to reveal their petrogenesis and source characteristics. Zircon U–Pb dating of the WG and YG plutons indicates formation ages of 171 Ma and 168 Ma, respectively. These granites are high-K calc-alkaline I-type granites, characterized by high SiO₂ and low P₂O₅ contents, enrichment in Rb, Th, U, and Pb, depletion in Nb, Ta, Ti, and P, with low Nb/U, Nb/Ta, and Zr/Hf ratios. They exhibit initial ⁸⁷Sr/⁸⁶Sr ratios of 0.7045–0.7063, ε_Nd(t) values of −12.28 to −11.36, and zircon ε_Hf(t) values of −14.65 to −9.19. These geochemical and isotopic characteristics suggest that the granites originated from partial melting of a modified crustal source comprising both juvenile and ancient crustal components. Petrogenetic modeling indicates that the WG magma formed under pressures of 12.5–13 kbar with a garnet-bearing amphibolite residue, while the YG magma formed under pressures of 9–10 kbar with a plagioclase-dominated amphibolite residue. The source characteristics of the granites indicate that the lower crust underwent significant modification through magma underplating before the Jurassic, which likely weakened the crust and facilitated subsequent tectonic deformation. This research provides a lower age limit of 170–168 Ma for constraining the initiation of episode A of the Yanshanian Movement.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"283 ","pages":"Article 106535"},"PeriodicalIF":2.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}