Journal of Palaeogeography最新文献

{"title":"The Middle Jurassic fluvial record of the Central High Atlas (Guettioua Formation, Morocco): seasonal rivers in a dynamic palaeogeography","authors":"Chiara Cavallina ,&nbsp;Marco Benvenuti ,&nbsp;Mauro Papini","doi":"10.1016/j.jop.2025.100272","DOIUrl":"10.1016/j.jop.2025.100272","url":null,"abstract":"<div><div>This paper addresses the need for a regional stratigraphic revision of the Bathonian–Callovian Guettioua Formation, widely exposed across the Central High Atlas (CHA, Morocco). Despite numerous studies, the stratigraphy of this formation, its relationship with tectonic activity, and fluvial dynamics are still not fully understood. This study employs a comprehensive approach integrating detailed geological mapping, facies analysis, paleocurrent measurements, and identification of multi-order unconformity surfaces to define the Guettouia Unit (GU), which records an articulated drainage network related to a source-to-sink system strongly controlled by active crustal deformation. From the depositional perspective, the GU is associated with seasonal rivers, whose sedimentological features conform to the distributive fluvial system (DFS) facies model. The syntectonic control on depositional processes during the deposition of the GU is evidenced by: (1) angular unconformities that bound and occur within the GU strata, and (2) regional paleocurrent trends, which indicate the presence of Middle Jurassic paleohighs and structural thresholds. Through our integrated stratigraphic and sedimentological analyses, we reveal the development of a regional fluvial drainage recorded by the GU strata, which positively supports the hypothesis of an incipient and diffuse uplift of the CHA, predating the relief caused by the Cenozoic plates’ convergence. As a generalizable conclusion, this study demonstrates that ancient fluvial systems not only provide insights into depositional processes and systems but also serve as valuable proxies for reconstructing the evolution of complex geodynamic settings.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100272"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics, genesis, and paleoenvironmental significances of oncolites in the lower Permian (Cisuralian) Balikelike Formation from the northwestern Tarim Basin, China","authors":"Guang Yang ,&nbsp;Zhen-Yu Wang ,&nbsp;Xing-Zhi Wang ,&nbsp;Yun-Feng Zhang","doi":"10.1016/j.jop.2025.100286","DOIUrl":"10.1016/j.jop.2025.100286","url":null,"abstract":"<div><div>The Permian marks a pivotal transition in Earth's evolutionary history, with oncolites offering insights into paleoenvironmental and evolutionary dynamics. This study documents the first occurrence of oncolites in the lower Permian (Sakmarian) Balikelike Formation in the Keping area, northwestern Tarim Basin, China. Integrated lithofacies analysis, geochemistry, and multi-scale observations reveal that the Balikelike Formation at the Subashi section comprises a complete third-order sequence, with two layers of oncolites developed in the highstand systems tract. These oncolites, predominantly developed on marl and interbedded with mudstone, exhibit elliptical, cap-shaped, hemispherical, and thin-plated morphologies. Fluorescence microscopy exhibits yellow-green fluorescence in dark laminae, while SEM identifies fossilized filamentous cyanobacteria. Geochemical data — Sr isotopes, weathering index values, and Sr/Ba ratios — suggest that oncolites develop in a warm, humid, and high-salinity environment with limited terrestrial input. The oncolite proliferation coincides with the initial magmatic phase of the Tarim Large Igneous Province, evidenced by negative carbon isotope excursions and the lower ⁸⁷Sr/⁸⁶Sr ratios compared to global seawater, signaling an interglacial warming phase. Volcanic activity likely curtailed the Asselian–Sakmarian glaciation in the Tarim Basin earlier than elsewhere, with carbon emissions, climate warming, and eutrophication, driving massive occurrence of oncolite.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100286"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sedimentary facies architecture and terminal fan systems of the lower Palaeogene Shahejie formation in Bonan Sag, Bohai Bay Basin, China: implications for hydrocarbon exploration","authors":"Arthur Paterne Mioumnde ,&nbsp;Li-Qiang Zhang ,&nbsp;Yi-Ming Yan ,&nbsp;Lauben Twinomujuni ,&nbsp;Hong-Wei Ran ,&nbsp;Victor Sedziafa ,&nbsp;Kevin Zebaze Djuka ,&nbsp;Moise Bessong ,&nbsp;Emmanuel Melaine Kouame","doi":"10.1016/j.jop.2025.100268","DOIUrl":"10.1016/j.jop.2025.100268","url":null,"abstract":"<div><div>In the search for oil reservoirs within the lower fourth member of the Paleogene Shahejie Formation (Es4x), understanding the depositional model is crucial, particularly in the Bonan Sag of the Bohai Bay Basin. Previous studies have provided limited perspectives on the depositional mechanisms in complex geological settings characterized by tectonic orogeny, volcanic activity, and metamorphism. This research seeks to address this knowledge gap by focusing on sedimentary deposits formed by the terminal fan system, diverging from the more commonly studied fan delta models. This study aims to clarify the depositional environment and mechanisms of the Es4x Member by identifying and characterizing the sedimentary facies and exploring how provenance influences the distribution of sandstone reservoirs in this heterogeneous formation. Data from more than 20 wells and over 500 m of cores revealed 15 lithofacies types, which were grouped into five facies associations (FA1--FA5) and used to describe the depositional architecture. These subfacies are categorized into feeder, distributary, and basal zones, with proximal, medial, and distal subfacies. Lithological analysis identified the dominant rock types as lithic arkose, feldspathic litharenite, and litharenite. The results show that the medial subfacies dominates the Bonan Sag during the deposition of the Es4x Member, occasionally extending towards the basinal zone through sporadic diffuse flood channels. This depositional mechanism reflects ephemeral water stretches influenced by varying weather conditions. Volcanic clasts distributed beyond the terminal fan system further illustrate the influence of volcanic activity on depositional processes. This study provides key findings on the sedimentary mechanisms in the Es4x Member, offering important information regarding deep reservoirs in tectonically active areas, particularly the challenges of predicting oil reservoirs in thin versus thick red beds.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100268"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrological and stratigraphical investigations of newly discovered phosphatic microfossils from the Sirban Formation, Hazara Basin, North Pakistan: Unveiling the late Sinian to middle Cambrian ecosystem","authors":"Khawaja Umair Majeed ,&nbsp;Muhammad Saleem Mughal ,&nbsp;Xi-Juan Tan ,&nbsp;Sara Criniti ,&nbsp;Massimo Civitelli ,&nbsp;Kamaran Siddique ,&nbsp;Syed Zakaullah Shah Tirmazi ,&nbsp;Mirza Shahid Baig ,&nbsp;Salvatore Critelli","doi":"10.1016/j.jop.2025.100288","DOIUrl":"10.1016/j.jop.2025.100288","url":null,"abstract":"<div><div>The late Sinian to Middle Cambrian Sirban Formation in Pakistan's Hazara Basin, located within the lesser Himalayas, provides critical insights into the depositional and diagenetic history of the Proto-Tethys Ocean. Originating from the breakup of Rodinia in the late Precambrian, this ocean persisted until the Devonian, influenced by the rifting of the Indian Plate from Gondwana. The Sirban Formation, comprises four lithofacies: fossiliferous limestone, dolomitic limestone, fossiliferous chert and stromatolitic brecciated and banded chert, which collectively reflect a spectrum of depositional environments ranging from high-energy shoreline to stable marine shelf. Petrographic studies reveal biosparite (bioclast packstone to grainstone), dolostone to oomicrite (ooidal packstone to grainstone), microcrystalline chert/mudstone and hematite-bearing cryptocrystalline to microcrystalline chert microfacies indicative of varying conditions, including oxygen-restricted and biologically active settings, which suggest high productivity in Proto-Tethyan Ocean. Additionally, diverse porosity types in the dolomitic limestone, indicate a potential hydrocarbon reservoir. A rich fossil assemblage occurrence e.g., trilobites (<em>Ptychoparia striata, Olenoides</em>) and taxa like <em>Dickinsonia</em> and <em>Hallucigenia</em>, aligns the Sirban Formation with global Cambrian chronologies, providing biostratigraphic and ecological links across the Proto-Tethys. Notably, the presence of <em>Dickinsonia</em> and <em>Kimberella</em> marks the paraconformity in the area for the first time, indicating a significant stratigraphic transition. This study enhances stratigraphic correlations, particularly with the Burgess Shales Formation, and proposes a comprehensive depositional model for the Proto-Tethys marine shelf. By elucidating the interplay of tectonic, ecological and sedimentological controls, this research deepens our understanding of Late Sinian to Middle Cambrian marine environments, establishes critical linkage between regional stratigraphy and global tectonic-biological co-evolution.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100288"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New perspectives on the paleogeographic context of the Late Paleozoic Ice Age in Southwest Gondwana: U–Pb ages and sedimentary provenance data from the Paganzo Basin, Argentina","authors":"Julián D. Rolan ,&nbsp;Jonatan A. Arnol ,&nbsp;Francisco I. Lugo ,&nbsp;Norberto J. Uriz ,&nbsp;Andrea R. Bidone ,&nbsp;Carlos A. Cingolani ,&nbsp;Miguel A.S. Basei ,&nbsp;Maximiliano Naipauer","doi":"10.1016/j.jop.2025.100274","DOIUrl":"10.1016/j.jop.2025.100274","url":null,"abstract":"<div><div>This study presents the first detrital zircon U–Pb analysis alongside new petrographic data from the Jejenes Formation (Serpukhovian–Bashkirian), located on the southern margin of the Paganzo Basin, Argentina in Southwest Gondwana. The results were compared with previously published data from other synchronously deposited units to the north (Guandacol Formation) and northeast (Malanzán Formation). Notably, glacigenic deposits are present in both the Guandacol and Jejenes formations but absent in the Malanzán Formation. A sedimentary provenance analysis was conducted for the three units, highlighting similarities and differences among the depocenters, allowing for the reconstruction of the paleogeographic and topographic landscape of the Paganzo Basin during the Serpukhovian–Bashkirian time. The comparative analysis supports the idea of disconnection and isolation among the three depocenters with each unit recording predominantly proximal sources and the recycling of pre-Carboniferous substrate. Although certain similarities exist in the age distribution of the detrital zircon grains recorded for the Malanzán and Guandacol formations, this does not imply that the depocenters were connected or fed by the same source area. Instead, these successions were likely sourced from rocks with a similar geological history, resulting in comparable age distributions due to sediment recycling. Thus, the results support a conservative approach when estimating sedimentary provenance in ancient glacigenic deposits, emphasizing the need to evaluate local sediment sources. The absence of glacigenic deposits in the Malanzán Formation could be linked to a lower topography, linked to distinct tectonic histories in the Pie de Palo, Valle Fértil, and Chepes–Malanzán ranges, underscoring the role of tectonic inheritance in the distribution of glacial centers during the Late Paleozoic Ice Age.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100274"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plio–Pleistocene water cooling in the southeastern Pacific Ocean: Insights from paleoecology, marine sedimentary facies analysis, and Sr isotope stratigraphy at Coquimbo (∼30°S), Chile","authors":"Diego Partarrieu ,&nbsp;Luisa Pinto ,&nbsp;Constanza García ,&nbsp;Saleta de los Arcos ,&nbsp;Melissa González ,&nbsp;Gabriela Solís-Pichardo ,&nbsp;Gerardo Arrieta-García ,&nbsp;Teodoro Hernández-Treviño ,&nbsp;Peter Schaaf ,&nbsp;Francisco Fonseca ,&nbsp;F. Amaro Mourgues ,&nbsp;Pablo Oyanadel-Urbina ,&nbsp;Martín Chávez-Hoffmeister ,&nbsp;Jorge D. Carrillo-Briceño ,&nbsp;Valentina Flores-Aqueveque ,&nbsp;Patricio Zambrano-Lobos ,&nbsp;Cristina Ortega ,&nbsp;Marcelo M. Rivadeneira","doi":"10.1016/j.jop.2025.100269","DOIUrl":"10.1016/j.jop.2025.100269","url":null,"abstract":"<div><div>Understanding the oceanographic and environmental changes experienced on the South American Pacific coast during the Plio–Pleistocene transition and the influence of these variations on the evolution of marine ecosystems is particularly interesting to assess the effects of current global climate projections. We present a stratigraphic model of the marine sedimentary successions exposed in Coquimbo (∼30°S), northern Chile, supported by 22 numerical ages from the last 6 Ma obtained through ⁸⁷Sr/⁸⁶Sr dating of fossil mollusk shells. This stratigraphic model, and paleoecological and sedimentary facies analyses allow us to interpret the paleoenvironmental evolution and depositional dynamics in the basin. The marine successions accumulated in four sedimentation episodes: the first two on the shoreface during Messinian–Zanclean (∼6–5.10 Ma) and Zanclean–Piacenzian (∼4.23–3 Ma) ages, whereas the last two occurred mainly on the foreshore during middle Calabrian (∼1.15 Ma) and late Calabrian–Chibanian (∼0.83–0.25 Ma). The most significant taxonomic changes are observed in the transition between the Pliocene and Pleistocene deposits (∼3–1.15 Ma), reflecting the shift from faunal associations typical of warm-temperate waters to others of cool-temperate water preferences. The faunal turnover identified in this study correlates well with two climatic transition pulses out of three previously recognized in the southeastern Pacific Ocean for the Plio–Pleistocene: one during the Piacenzian–Gelasian (3–2.4 Ma), marked by a decrease in water temperature and an expansion of upwelling zones in the Humboldt Current System; and the other during the Gelasian–Calabrian (2–1.5 Ma), which has been linked to the establishment of the current El Niño Southern Oscillation (ENSO) climate system.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100269"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144771381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rhodoliths and trace fossils record stabilization of a fan-delta system: An example from the Mio-Pliocene deposits of Gran Canaria (Canary Islands, Spain)","authors":"Ana Cristina Rebelo ,&nbsp;Alfred Uchman ,&nbsp;Markes E. Johnson ,&nbsp;Carlos S. Melo ,&nbsp;Juana Vegas ,&nbsp;Inés Galindo ,&nbsp;Eduardo J. Mayoral ,&nbsp;Ana Santos ,&nbsp;Alberto González-Rodríguez ,&nbsp;Julio Afonso-Carrillo ,&nbsp;Sérgio P. Ávila ,&nbsp;Esther Martín-González","doi":"10.1016/j.jop.2025.100266","DOIUrl":"10.1016/j.jop.2025.100266","url":null,"abstract":"<div><div>Fan-delta systems are geomorphological structures and sedimentary records seldom preserved on oceanic volcanic islands. The generally coarse-grained deposits belonging to the Las Palmas Detritic Formation (Mio-Pliocene) at the Las Rehoyas section, NE part of Gran Canaria Island (Canary Islands, Spain), contain abundant but relatively small rhodoliths, non-nucleated, in partly bioturbated (<em>Skolithos</em> ichnofacies) sand-dominated strata. This section consists of four sedimentary units deposited in a fan-delta system that developed on a marine platform in the northeastern part of the island. The system was flooded during the late Miocene to early Pliocene, a non-eruptive phase on Gran Canaria Island. Stabilization of the fan delta due to a relative rise in sea level enabled colonization by burrowing organisms and the development of rhodoliths, which were redeposited by storms from the lower shoreface–offshore to the foreshore–middle shoreface environment.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100266"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144702253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lacustrine delta-offshore bar system: depositional characteristics and formative mechanism","authors":"Chang-Ni Liu ,&nbsp;Sheng-He Wu ,&nbsp;Zhen-Hua Xu ,&nbsp;Qi Ren ,&nbsp;Da-Li Yue ,&nbsp;De-Gang Wu ,&nbsp;Yi-De Sun ,&nbsp;Wen-Fu Cui ,&nbsp;Ke-Li Li","doi":"10.1016/j.jop.2025.100267","DOIUrl":"10.1016/j.jop.2025.100267","url":null,"abstract":"<div><div>The lacustrine delta-offshore bar system serves as a critical hydrocarbon reservoir, in which sedimentary processes and depositional characteristics reflect a complex interplay of hydrodynamic, sedimentological, and geomorphic dynamics. Notably, such systems with their full suite of morphological attributes have not been numerically simulated prior to this study. Our Delft3D simulation has successfully reproduced the delta-offshore bar system for the first time, providing a tool to quantitatively analyze its depositional processes and stratigraphic signatures. Three new perspectives are proposed: 1) Three distinct hydrodynamic reaches of the system are recognized by hourly-averaged seaward flow velocity and hourly-averaged water level: fluvial-dominated reaches (positive seaward flow velocity and water level); interaction reaches (both nearly zero); and wave-dominated reaches (negative seaward flow velocity despite sustained positive water level). Deltaic front and offshore bars develop simultaneously in fluvial-dominated and wave-dominated reaches, respectively, which are separated by an interaction reach. They exhibit distinct morphological and depositional characteristics resulted by different depositional processes. 2) Partially submerged offshore bars form near the breaker zone in the wave-dominated reaches, originating from thin and submergent longshore shoreface. Initially, two offshore bars form on both sides of the longshore shoreface through vertical accretion, then they experience elongation and merge into a large-scale bar through lateral accretion, and finally continue to widen through landward accretion. 3) Deltas are confined to the fluvial-dominated reaches, extending to a certain length with a low length-to-width ratio and a smooth shoreline, featuring rare sinuous distributary channels before the formation of the large-scale offshore bar. Once the large-scale offshore bar forms, deltas continue to prograde basinward. The results of this study have been applied to reservoir characterization, improving the identification of single sand-bodies and internal accretions in Member 2 of the Paleogene Shahejie Formation, Shengtuo Oilfield, Bohai Bay Basin, China.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100267"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lithofacies division and intelligent identification of the lacustrine mixed rocks in the Upper Xiaganchaigou Formation in Yingxi area of the Qaidam Basin, northwestern China","authors":"Yong-Shu Zhang ,&nbsp;Jia-Lin Fu ,&nbsp;Kun-Yu Wu ,&nbsp;Wu-Rong Wang ,&nbsp;Ying-Hai Jiang ,&nbsp;Shu-Qi Zhang ,&nbsp;Jian Li ,&nbsp;Han Wang ,&nbsp;Li-Ben Deng ,&nbsp;Zi-Mo Xu ,&nbsp;Na Zhang ,&nbsp;Cheng-Zao Jia ,&nbsp;Da-Li Yue","doi":"10.1016/j.jop.2025.100270","DOIUrl":"10.1016/j.jop.2025.100270","url":null,"abstract":"<div><div>The Lower Ganchaigou Formation in the Yingxi area of the Qaidam Basin is a typical lacustrine mixed rock reservoir in western China. It is characterized by strong interlayer heterogeneity, development of diverse lithofacies types, and complex response features in logging curves. These complexities make lithofacies identification of the Ganchaigou Formation particularly challenging for non-coring wells, demanding a more efficient and accurate approach. Based on lithology and structural patterns, a lithofacies classification scheme was established. Three intelligent logging identification methods based on improved long short-term memory (LSTM) networks were constructed for lithofacies identification. The accuracy of these methods was evaluated, and the most suitable intelligent logging identification method for the reservoir lithofacies in the Yingxi area was selected. In the Upper Xiaganchaigou Formation (E₃² section) of the Yingxi area, a total of eight lithofacies types were identified: laminated lime-dolostone, stratified lime-dolostone, laminated dolostone-lime, stratified dolostone-lime, laminated lime-dolomitic shale, massive mudstone, sandstone, and gypsum. The overall recognition accuracies of the LSTM, Bi-LSTM, and Attention-based Bi-LSTM intelligent identification models are 81%, 85%, and 87%, respectively. The overall recognition accuracies of the three intelligent algorithms are relatively high, with the Attention-based Bi-LSTM model achieving the highest accuracy. This model demonstrates superior applicability for intelligent lithofacies identification in lacustrine mixed rock reservoirs, particularly those dominated by carbonates in the Yingxi area. It effectively interprets the lithofacies types of non-coring wells in the study area and provides a valuable reference for interpreting lithofacies logs in similar depositional environments.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100270"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reversal of drainage patterns related to the Late Cretaceous topographic doming: a case study from eastern Gondwana basins of India","authors":"Sankar Kumar Nahak ,&nbsp;N. Prabhakar ,&nbsp;Santanu Banerjee ,&nbsp;Shreerup Goswami","doi":"10.1016/j.jop.2025.100294","DOIUrl":"10.1016/j.jop.2025.100294","url":null,"abstract":"<div><div>Mantle plume upwelling and associated topographic doming may affect sedimentation systems over large areas of the Earth’s crust, including drainage basins. An integrated provenance study, including petrography, palaeocurrent data, heavy mineral chemistry, and detrital monazite dating of the Palaeo-Mesozoic Gondwana sandstones in the Mahanadi Basin in eastern India, tracks sediment sources, reconstructs the palaeogeography of eastern Gondwanaland, and records the effects of doming on drainage pattern. The sandstones are mostly arkosic to quartz arenite, sourced from transitional continental to craton interior regions. Garnet chemistry from Permian sandstones suggests a dominant contribution from source rocks metamorphosed under amphibolite to granulite facies conditions. Tourmaline chemistry of the Late Carboniferous to the Late Triassic sandstones links its source primarily to metapelites and metapsammites rocks, while the same indicates predominant Li-poor granitoid sources for the Early Cretaceous sandstones. The spectrum of monazite detrital ages of the Mahanadi sandstones reveals four major clusters: (1) 2385–2249 Ma, (2) 1627–1547 Ma, (3) 1146–662 Ma, and (4) 571–410 Ma. The integration of heavy mineral chemistry, petrography, monazite geochronology, and palaeocurrent data, from the Permo-Carboniferous to the Late Triassic sandstones, establishes sediment sources within the Eastern Ghats Mobile Belt and the Singhbhum Mobile Belt of India, and East Antarctica. In contrast, the southerly palaeocurrent record of the Early Cretaceous deposit indicates sediment supply from the Rengali province of the Eastern Ghats Mobile Belt (EGMB) and the Chhotanagpur Gneissic Complex. Therefore, Early Cretaceous sandstones attest to a change in source rock, primarily controlled by the south-easterly tilting of the basin, linked to the mantle plume-related domal uplift. This study also highlights that before the breakup of Gondwanaland, East Antarctica and EGMB existed as a single landmass.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"14 4","pages":"Article 100294"},"PeriodicalIF":2.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}