Journal of Asian Earth Sciences最新文献

{"title":"Tectonic control on the channel offset orientations in the Ganga foreland basin: A neotectonic perspective","authors":"Rahul K. Choudhury ,&nbsp;Pitambar Pati ,&nbsp;Narendra K. Patel ,&nbsp;Manoj K. Jaiswal","doi":"10.1016/j.jseaes.2025.106903","DOIUrl":"10.1016/j.jseaes.2025.106903","url":null,"abstract":"<div><div>The current study in the Ganga foreland basin used 2202 channel offset orientations to establish their relationship with the neotectonics. The variation of the offset orientations acknowledge the directions of plate motion, regional stress field, compressional and extensional structures, subsurface basement ridges, and faults in the foreland. 53.52% offsets are aligned along the NE-SW, i.e., parallel to the plate movement direction, while the rest are aligned NW-SE, i.e., parallel to the Himalayan compressional trend, with the highest concentration along the N40°-60°E and N40°-60°W. The NW-SE stress imposed by the Indian plate’s compression develops various parallel faults and joints, followed by the channel offsets. The decreasing compression intensity away from the Himalayas creates fewer offsets parallel to it, and this trend continues up to the Delhi-Sargodha Ridge’s (DSR) influence at the basin’s southern edge. The NE-SW offsets in the central Ganga basin are influenced by the NE-SW trending faults and basement ridges. The variable strike-slip components along the basement faults contribute to the NE-SW offsets. More NW-SE offsets in the eastern part of the basin are correlated with a larger crustal shortening rate than the western part. The Yamuna-Ganga, Ganga-Ghaghara, Ghaghara-Rapti, Rapti-Gandak, and Gandak-Kosi interfluves record 42.67%, 43.66%, 42.31%, 50.17%, and 55.08% of offsets in NW-SE quadrants, respectively. The E-W trending longer offsets generally seen at the basin’s periphery are due to the strike-slip displacement. However, the E-W offsets in the eastern part of the basin are due to the shallow subsurface thrust splays parallel to the Himalayan Frontal Thrust (HFT).</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106903"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749805","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":"Cimmerian tectonostratigraphic events in east-central Iran revealed by a long drill core of the Shemshak Group (Upper Triassic–Middle Jurassic)","authors":"Mohammad Ali Salehi ,&nbsp;Markus Wilmsen ,&nbsp;Ehsan Zamanian ,&nbsp;Christoph Heubeck","doi":"10.1016/j.jseaes.2025.106895","DOIUrl":"10.1016/j.jseaes.2025.106895","url":null,"abstract":"<div><div>The Upper Triassic–lower Middle Jurassic tectono-sedimentary megacycle in central Iran is represented by the Shemshak Group, deposited within the central part of the Cimmerian continent (the “Iranian Cimmerides”). It contains key information on the Mesozoic geodynamics of the Middle East during the collision of the Cimmerian terranes with Eurasia. However, detailed insights into the response of depositional systems to the complex contemporaneous tectonics are hampered by poor exposure, in particular of fine-grained strata. A new, 641-m-long core from the northern Tabas Block (east-central Iran) provides an unweathered and continuous subsurface record of the Shemshak Group. Detailed lithofacies and stratigraphic analyses refine previous lithostratigraphic and palaeoenvironmental interpretations, allowing to consider relative sea-level changes caused by Cimmerian tectonic events and/or global sea-level fluctuations. The thick siliciclastic succession of the Rhaetian Qadir Member of the Nayband Subgroup reflects rapid basin subsidence in advance of the Main Cimmerian Event (MCE). It comprises the dominant part of the Shemshak Group. In the aftermath of the MCE at the Triassic–Jurassic boundary, comparatively low subsidence rates and limited accommodation prevailed, resulting in low thicknesses of the Lower–lower Middle Jurassic mixed siliciclastic and carbonate Ab-e-Haji Subgroup. Process and stacking-pattern analyses of eleven clastic and eight carbonate lithofacies indicate a variety of continental and marine depositional environments, ranging from fluvial and deltaic to shallow-marine. Our findings significantly improve the knowledge of the tectono-stratigraphic setting of the Shemshak Group and contribute to a better understanding of the Cimmerian history of central Iran between the Late Triassic and the Jurassic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106895"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797724","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":"Real-time prediction of peak ground acceleration for on-site earthquake early warning in China via Interpretable deep learning","authors":"Hao Fu ,&nbsp;Zaixian Chen ,&nbsp;Qiang Ma","doi":"10.1016/j.jseaes.2025.106877","DOIUrl":"10.1016/j.jseaes.2025.106877","url":null,"abstract":"<div><div>A Transformer-PGA network was developed for real-time peak ground acceleration (PGA) prediction of on-site earthquake early warning in China. It was designed to reduce magnitude saturation and to correct the underestimation of strong ground motion in current on-site earthquake early warning methods. A dataset of 6181 three-component ground motion records in China was used. Twenty-eight ground motion parameters were extracted from 0.5 to 50 s after P-wave arrival to train the model. Arias intensity, the average of the top ten peak velocities, and P-wave acceleration were identified as the dominant parameters. Arias’ intensity had an average sensitivity index of about 0.4. Three sub-models were derived with 12, 6, and 3 optimized input parameters. The Transformer-PGA model had a STD of 0.569 at 3 s, outperforming the <em>P</em>_d model (0.743) in reducing PGA underestimation. The sub-models retained over 97 % of the full model’s explained variance as measured by R². Compared with the LSTM model, the Transformer-PGA model showed higher prediction accuracy and produced earlier warnings. Typical warning times were 3 s for Transformer-PGA and 5 s for the LSTM model. For operational use, a dual threshold warning scheme is proposed. An initial alert is issued at 3 s to balance timeliness and accuracy. A refined report is issued at 10 s. In extreme cases, 1 s alerts are provided for emergency response. By combining a Transformer architecture with sensitivity-driven parameter optimization, improvements were made in accuracy, timeliness, and interpretability of real-time PGA prediction for earthquake early warning in China.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106877"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694520","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":"Provenance, tectonic setting, weathering patterns, and paleoclimate insight from late Holocene Wainganga River sediments, central India: a geochemical and statistical approach","authors":"Dileep Abdul Kalam T.,&nbsp;Samaya S. Humane,&nbsp;Sumedh K. Humane,&nbsp;Shreyash Sayankar","doi":"10.1016/j.jseaes.2025.106897","DOIUrl":"10.1016/j.jseaes.2025.106897","url":null,"abstract":"<div><div>The Geochemical composition of the Holocene sediments of the Wainganga Riverbank near Pauni town, Central India have been probed to understand the localised sedimentary evolution. The provenance of the sediments is of mostly felsic origin suggesting source rocks are granitic gneiss, granite, muscovite schists and gneiss from the adjacent area of the Wainganga River basin (WRB). The paleo weathering conditions plots suggest incipient to moderate chemical weathering. Analysis of tectonic setting discrimination diagrams demonstrate that the sediments are characteristic of a passive margin provenance. The transition from semi-arid to semi-humid climate is evident from the C-value plot and SiO₂ vs Al₂O₃ + K₂O + Na₂O diagram, with multivariate statistical analysis confirming this gradual climatic evolution. The shift in Rb/Sr and Sr/Cu ratios provide additional geochemical evidence supporting the inferred paleoclimatic shift from arid to more humid conditions accompanied by enhanced productivity. Four zones were demarcated based on the significant shifts in the geochemical ratios which are key indicators of climate shifts. The sedimentary record of Zone-I (1100–1300 cm) suggests moderate weathering, with substantial clay formation, potentially attributed to increased precipitation of changes in hydrological regime. Zone- II (800–1100 cm) represents dry period with limited moisture leading to minimal chemical weathering and better drainage or less organic matter accumulation. Zone-III (400–800 cm) shows a slight increase in weathering with more reducing conditions due to either poor drainage or high organic matter content. Zone-Ⅳ (50–400 cm) is characterised by drop in chemical weathering intensity followed by gradual increase, coinciding with a shift towards a more humid.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106897"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749081","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":"A refined classification of 3D shape preferred orientation patterns in fault gouges: Insights from the Yangsan and Ulsan Fault Zones, South Korea","authors":"Ho Sim ,&nbsp;Seongsik Hong ,&nbsp;Yungoo Song ,&nbsp;Seung-Ik Park ,&nbsp;Changyun Park","doi":"10.1016/j.jseaes.2025.106896","DOIUrl":"10.1016/j.jseaes.2025.106896","url":null,"abstract":"<div><div>Shape preferred orientation (SPO) analysis of rigid clasts in fault rocks is a fundamental tool for understanding grain-scale deformation process. However, the occurrence of anomalous patterns in 3D-SPO data has challenged traditional interpretations that rely solely on clast rotation systems observed in cross-sections. Here, we present a novel classification system for 3D-SPO patterns that accounts for the critical influence of clast morphology. Through integrated analysis of X-ray diffraction patterns, μ-CT imaging, 3D-SPO analysis, and electron microscopy data for three samples from the Yangsan and Ulsan fault zones (southeastern Korean Peninsula), we demonstrate that clast final shape and fabric under shear are primarily controlled by clast morphology, possibly combined with initial orientation. We classified all samples into four types based on clast morphology and identified six distinct SPO patterns associated with these classifications: top-spinning (type-S) and oblate-rolling (type-OR) for oblate type clasts, rotating (type-R) and prolate-rolling (type-PR) for prolate type clasts, and two distinct rotating patterns (types H and V) for bladed type clasts. Natural fault gouge typically exhibits a composite of these patterns, with the dominant pattern reflecting the predominant clast shape population. This refined understanding of the relationship between clast shape and SPO patterns significantly improves the reliability of SPO analysis and enhances our ability to reconstruct fault deformation process.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106896"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694519","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":"Insights on the structural framework of the Ailaoshan Orogenic Belt from gravity data","authors":"Nguyen Ngoc Long ,&nbsp;David Gomez-Ortiz ,&nbsp;Nguyen Kim Dung ,&nbsp;Luan Thanh Pham","doi":"10.1016/j.jseaes.2025.106902","DOIUrl":"10.1016/j.jseaes.2025.106902","url":null,"abstract":"<div><div>One of the important tasks in mapping geological structures is determining the horizontal boundaries of density structures. These boundaries can be estimated by using the edge detection techniques of gravity data. In this study, we apply several traditional edge enhancement filters along with recently developed techniques to the Bouguer gravity data to analyze structural trends and fault zones in the Ailaoshan Orogenic Belt, which is known as a significant suture zone between the South China Block and the Indochina Block. The edge recognition capabilities of these filters are examined using both noise-free and noisy synthetic gravity data before applying them to real gravity anomaly data of the belt. The structural features from the edge detection techniques are also confirmed by the Euler deconvolution method, where the result shows that the depth estimates in the Ailaoshan Orogenic Belt change from 0.9 to 4.7 km. The findings show that edge detection techniques produce anomaly maps that are well-correlated with the main tectonic framework of the study area, which trends NW-SE. These techniques are also helpful in identifying some structural features that are not visible at the surface, thus contributing to a more complete crustal framework of the Ailaoshan Orogenic Belt.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106902"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749804","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 botryoidal dolomite of the Ediacaran Dengying Formation (Yangtze Craton): Multi-proxy constraints on the terminal Neoproterozoic “dolomite sea”","authors":"Yao Wang ,&nbsp;Wenlong Ding ,&nbsp;Ziyou Zhang ,&nbsp;Shuaiyu Shi ,&nbsp;Rui Xia ,&nbsp;Mengyang Zhang ,&nbsp;Hao Jian","doi":"10.1016/j.jseaes.2025.106911","DOIUrl":"10.1016/j.jseaes.2025.106911","url":null,"abstract":"<div><div>The botryoidal dolomite within the Ediacaran Dengying Formation (Yangtze Craton, South China) represents distinctive features whose origins remain debated, having been variously interpreted as synsedimentary precipitates or as products of dolomitization on a carbonate platform. Detailed petrographic examination reveals two distinct subtypes based on crystal morphology and optical properties: fascicular slow dolomite (<em>FSD</em>) and radial slow dolomite (<em>RSD</em>). Integrated petrographic and geochemical analyses (δ¹³C, δ¹⁸O, rare earth element plus yttrium [REY] patterns, Y/Ho ratios, and clumped isotopes Δ47) constrain their contrasting origins. FSD—characterized by sinistral undulose extinction, dull-red to non-luminescence, relatively stable δ¹⁸O values (mean −2.76 ‰, VPDB), seawater-like REY patterns, and high Y/Ho ratios (≈ 38)—indicates precipitation from primary Dengying Formation seawater. Conversely, RSD exhibits straight extinction, euhedral rhombohedral terminations with bright luminescence, more negative δ¹⁸O values (mean −4.05 ‰, VPDB), positive Eu anomalies (Eu/Eu* = 1.41), and yields a clumped isotope temperature (T_Δ47) of 98 °C. These characteristics collectively demonstrate that RSD precipitated from fluids resulting from the mixing of seawater with hydrothermal fluids. The distinct origins of FSD and RSD provide crucial evidence for the ‘dolomite sea’ hypothesis, indicating it was not uniformly persistent during the Ediacaran on the Yangtze Craton. FSD precipitation reflects an anoxic, alkaline marine environment, while RSD preserves evidence for episodic hydrothermal activity within this Ediacaran ‘dolomite sea’. This challenges the paradigm of uniform marine conditions during the Precambrian–Cambrian transition. Our findings highlight botryoidal dolomite as a sensitive archive of fluid–rock interactions, offering valuable insights into paleoenvironmental perturbations preceding the Cambrian explosion.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106911"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797722","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 early Silurian I-type granitoids in the Nanling domain, South China: implications for the evolution of the Wuyi-Yunkai orogen","authors":"Hai Jiang ,&nbsp;Shao-Yong Jiang","doi":"10.1016/j.jseaes.2025.106917","DOIUrl":"10.1016/j.jseaes.2025.106917","url":null,"abstract":"<div><div>A long-standing debate exists over the petrogenesis of Early Paleozoic granites of the South China Block, with the main issue being whether these granites originated from intracontinental orogenic processes. Here, we report new zircon U-Pb geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotope data for two Silurian I-type granitoids in the Nanling domain, South China. The Meiziwo pluton, comprising granodiorite and monzogranite, and the Yaoling quartz porphyry have identical zircon U-Pb ages of ∼ 433 Ma. Rocks of both the Meiziwo and Yaoling plutons have I-type geochemical affinities and are metaluminous to peraluminous in composition (A/CNK = 0.94–1.27). They have low P₂O₅ contents that are negatively correlated with SiO₂. They show chondrite-normalized rare earth element (REE) patterns with LREE enrichment and moderately negative Eu anomalies (Eu/Eu* = 0.50–0.73). They display enrichments in Rb, Th, U, and Pb, and depletions in Ba, Nb, Sr, and Ti in primitive mantle normalized plots. They also have high ⁸⁷Sr/⁸⁶Sr_i ratios (0.712160–0.715776), low ε_Nd(t) (−10.9 to −8.8) and zircon ε_Hf(t) (−12.5 to −6.3) values, indicative of derivation from partial melting of an ancient mafic lower crust, modified by crystal fractionation. The degree of fractionation in the Yaoling quartz porphyry lies intermediate between that of the Meiziwo granodiorite and monzogranite. It is proposed that the Wuyi-Yunkai orogeny originated as an intracontinental orogeny, likely linked to the far-field effects of plate interaction along the northern margin of eastern Gondwana. Widespread post-orogenic felsic magmatism with subordinate mafic components (ca. 435–415 Ma) marks a tectonic transition from compression to extension. This shift is interpreted to reflect lithospheric delamination and the initiation of intracontinental extension in the region.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106917"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797743","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 Lithosphere-Atmosphere-Ionosphere coupling (LAIC) processes around the 2024 Wushi (China) Mw7.1 earthquake","authors":"Xuemin Zhang ,&nbsp;Angelo De Santis ,&nbsp;Pan Xiong ,&nbsp;Gianfranco Cianchini ,&nbsp;Aisa Yisimayili ,&nbsp;Saioa A. Campuzano ,&nbsp;Na Yang ,&nbsp;Serena D’Arcangelo ,&nbsp;Jing Liu ,&nbsp;Mariagrazia De Caro ,&nbsp;Xinyan Li ,&nbsp;Cristiano Fidani ,&nbsp;Muping Yang ,&nbsp;Martina Orlando ,&nbsp;Xinyang Ouyang ,&nbsp;Loredana Perrone ,&nbsp;Hong Liu ,&nbsp;Dario Sabbagh ,&nbsp;Maoning Feng ,&nbsp;Maurizio Soldani ,&nbsp;Shukai Wang","doi":"10.1016/j.jseaes.2025.106916","DOIUrl":"10.1016/j.jseaes.2025.106916","url":null,"abstract":"<div><div>This paper presents a comprehensive analysis on multiple parameters in the lithosphere, atmosphere and ionosphere, around the Wushi M_w7.1 earthquake that occurred on 22 January 2024, in Xinjiang, China. Typical perturbations were picked up with different methods, with a limited time period for lithospheric parameters of longer than 3 years, 90 days before and 10 days after for most atmospheric and ionospheric parameters, in a limited distance within Dobrovolsky’s area of about 1000 km. All the results show that about 60 anomalies were detected before the Wushi earthquake, with medium-term ones lasting about 1 year in the lithosphere, and short-term ones within 3 months in the atmosphere and ionosphere, where the outgoing long wave radiation covered the earthquake occurrence time from four days before to four days after, considered an imminent indicator. The thrust focal mechanism of this earthquake helps to explain the anisotropic feature in Earth’s resistivity and orientation in the electric field, and also the weak variations in the <em>b</em>-value. By combining ground-based and spaceborne observations, a few parameters clearly illustrated the approaching earthquake location, which makes a certain contribution to future earthquake prediction. The accumulating rate of all the anomalies exhibited a fast exponential trend, which illustrates both direct and indirect lithosphere-atmosphere–ionosphere coupling mechanisms during the preparation stage of the Wushi earthquake.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106916"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797699","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":"Constraints of the paleo-trade wind route on the paleo-geography of the South China Block in the Late Permian (Lopingian)-Early Triassic","authors":"Rufei Peng ,&nbsp;Chenlin Hu ,&nbsp;Xin Li ,&nbsp;Hongmei Su ,&nbsp;Jonathan Atuquaye Quaye ,&nbsp;Cheng Dong","doi":"10.1016/j.jseaes.2025.106900","DOIUrl":"10.1016/j.jseaes.2025.106900","url":null,"abstract":"<div><div>South China Block (SCB) is situated in the Eastern Asian margin. During the crucial transitional Formation of the Permian-Triassic boundary in geological history, the SCB was located in a shallow sea environment within the low-latitude trade winds zone, accumulating marine sedimentary deposits. There are numerous studies concerned on the paleoecological and biological evolution of the SCB, but studies of paleogeography are few and the paleogeographic position of the SCB remains as a matter of debate. In this paper, we describe the sedimentary features of Late Permian (Lopingian) to Early Triassic in the Sichuan Basin, northwestern SCB, and present new magnetic fabrics for these sequences. The results of sedimentary differentiation and anisotropy of magnetic susceptibility indicated prevailing wind routes of 106.6° ± 4.3° east of north in the Late Permian and 118.2° ± 4.7° east of north in the Early Triassic. After correcting for a 70° clockwise rotation of the SCB since the Permian-Triassic boundary, the paleo-wind routes are reconstructed as 36.6° ± 4.3° and 48.2° ± 4.7° east of paleo-north for these periods. The study of the paleo-wind routes indicates that the SCB migrated northward from a near-equatorial position in the Late Permian (Lopingian) to a more distant location in the Early Triassic, marking significant movement within the Northern Hemisphere. The paleogeographic position of the SCB was determined by aligning its quantitatively reconstructed predominant paleo-wind routes with the latitudinal variation of Northern Hemisphere trade wind patterns. This analysis indicates that the SCB was located near the equator in the Late Permian and had migrated northward within the Northern Hemisphere by the Early Triassic. These findings provide insights into the paleoclimate and paleogeographic evolution of the SCB and offer data for other studies. Moreover, the methodology employed in this study serves as a useful reference for paleogeographic and paleoclimatic reconstructions of other ancient landmasses.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"297 ","pages":"Article 106900"},"PeriodicalIF":2.4,"publicationDate":"2026-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694521","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}