Journal of Palaeogeography最新文献

{"title":"The “underfilled trinity model” of foreland basins revisited: reality or myth?","authors":"Xiu-Mian Hu ,&nbsp;Eduardo Garzanti ,&nbsp;Juan Li ,&nbsp;Marcelle BouDagher-Fadel ,&nbsp;Giovanni Coletti ,&nbsp;An-Lin Ma ,&nbsp;Wen-Dong Liang ,&nbsp;Wei-Wei Xue","doi":"10.1016/j.jop.2024.07.001","DOIUrl":"10.1016/j.jop.2024.07.001","url":null,"abstract":"<div><div>The “<em>underfilled trinity</em>” model of foreland-basin stratigraphy was proposed based on the observation that the initial sedimentary stages along the western and northern front of the western and central Alps were represented by shallow-water carbonates (Calcaires à Nummulites) overlain by hemipelagic marls (Marnes Bleues) and capped by siliciclastic turbidites (Grès d’Annot). Subsequently, this model has been widely accepted and applied in foreland basins worldwide. We here re-investigated the Eocene-Oligocene sedimentary succession of the Western Alps to check its validity. Major geological features of this region include: i) the existence of a Cretaceous-Eocene unconformity spanning more than 25 Myr in the studied sections; ii) a virtually synchronous age of the Calcaires à Nummulites, Marnes Bleues, and Grès d’Annot formations across the Western Alps; iii) a long-term deepening-upward trend, from inner to outer ramp, documented by the Calcaires à Nummulites, followed by the pelagic Marnes Bleues and by the Grès d’Annot turbidites; iv) the provenance of the Grès d’Annot Formation from the Maures-Estérel Massif and/or Corsica-Sardinia block in the south, rather than from the Alpine orogen in the east. By integrating field observations, sedimentological, biostratigraphic, and provenance analyses, we found the Eocene “underfilled foreland” model too simplistic and inadequate to explain the basin evolution in the western Alpine region. Based on the alternative scenario proposed herein, the Annot and Barrême basins formed in the late Eocene (40-35 Ma) in an extensional/transtensional setting during a period of major change in tectonic stress fields across western Europe on the upper plate of the Apennine subduction.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 675-705"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Upwelling current and its relationship to the enrichment of organic matter in the Lower Silurian Longmaxi Formation, northern Chongqing–western Hubei area, southern China","authors":"Jun-Jun Shen ,&nbsp;Jia-Kai Yan ,&nbsp;Peng-Wan Wang ,&nbsp;Yu-Man Wang ,&nbsp;Lin Zhou ,&nbsp;Yu-Bing Ji ,&nbsp;Min Xu","doi":"10.1016/j.jop.2024.08.005","DOIUrl":"10.1016/j.jop.2024.08.005","url":null,"abstract":"<div><div>Upwelling currents play a crucial role in the enrichment of organic matter, yet the mechanisms driving this process remain incompletely understood due to methodological and data resolution limitations. In this paper, we employ a combination of biostratigraphic classification, qualitative methods, and quantitative methods to systematically analyze the sedimentological and geochemical characteristics of the Lower Silurian Longmaxi Formation in the northern Chongqing–western Hubei area, southern China. The relationship between the upwelling currents and organic matter enrichment in the shale of the Longmaxi Formation is investigated. Results indicate that the upwelling currents in the study area were primarily influenced by the foreland flexure process. From the Rhuddanian (flexure–sedimentation stage) to the Aeronian (flexure–migration stage), the more intense tectonic activity led to gradual opening of the barrier between the South Qinling Ocean and the Yangtze Platform, resulting in an increase in the influx of the oceanic current. The upwelling currents significantly contributed to the organic matter production, albeit without substantially affecting the preservation conditions. Throughout the succession of the Longmaxi Formation, the organic matter content decreased gradually from the passive continental margin to the foreland flexural stagnant basin, which was mainly due to deterioration of the preservation conditions as a result of sea level fall and increased terrigenous input. Despite the increase in the upwelling currents, they did not decisively control the organic matter enrichment. Spatially, during the Rhuddanian to Aeronian period, the organic matter content decreased similarly from the passive continental margin to the foreland flexural stagnant basin, influenced by reduced organic matter production caused by weakening of the upwelling currents and the worsening preservation conditions caused by sea-level fall. The terrigenous input had a relatively minor impact. The results of this study provide new insights into the role of upwelling currents in the organic matter enrichment within the Longmaxi Formation, overcoming previous methodological and resolution barriers.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 993-1015"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A remarkable decade of learning and sharing knowledge through the Journal of Palaeogeography (JoP) (2014–2024): Reminiscences from an Associate Editor-in-Chief","authors":"","doi":"10.1016/j.jop.2024.06.005","DOIUrl":"10.1016/j.jop.2024.06.005","url":null,"abstract":"<div><div>In this editorial, an Associate Editor-in-Chief of the <em>Journal of Palaeogeography</em> (JoP) reminisces his publication experience in JoP during the period 2014-2024. 1) During a period of nine years, he contributed eight review articles, three discussions, two replies, one book review, one glossary, and one tribute to the first Editor-in-Chief Prof. Zeng-Zhao Feng. His contributions totaled 534 printed pages. 2) His contributions examined 19 different domains, such as landslides, submarine fans, seismites, SSDS, hyperpycnites, rivers, etc. 3) His contributions coincided with the formative years of JoP. 4) The impact of his articles is evident from the Stats published by ResearchGate. For example, his review article “The Landslide Problem” has reached 11,611 Reads and 186 Citations after nine years of publication in 2015. 5) In 2023, the CNKI (China National Knowledge Infrastructure) recognized his article “Submarine fans: a critical retrospective (1950-2015)” as the Top-1% most-highly cited publications in the <em>Journal of Palaeogeography</em> published during a 10–year survey period: 2012–2022. 6) He was inducted as a Founding Member of the International Society of Palaeogeography (ISP) at Changping District of China University of Petroleum (Beijing), Beijing on July 16, 2022. 7) His JoP editorship during the past 10 years has been the most challenging, inspiring, and rewarding experience of his global scientific journey spanning over six decades (1962–2024).</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 1029-1040"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional reconstruction of Late Miocene Trapa from eastern Zhejiang Province, China: Insights into its phytogeography and evolution","authors":"Liang Xiao ,&nbsp;Man Yuan ,&nbsp;De-Shuang Ji ,&nbsp;Li-Yan Guo ,&nbsp;Xiang-Chuan Li ,&nbsp;Xing Wang ,&nbsp;Jia-Nan Wang ,&nbsp;Jia-Qi Liang ,&nbsp;Mei-Ting Wang","doi":"10.1016/j.jop.2024.08.002","DOIUrl":"10.1016/j.jop.2024.08.002","url":null,"abstract":"<div><div>Abundant plant fossils were found in the Upper Miocene Shengxian Formation, eastern Zhejiang Province, China, among which <em>Trapa</em> belongs to a dominant population. The fossil fruits of <em>Trapa</em> were well preserved with abundant details. However, due to compaction during fossilization, <em>Trapa</em> fruits were often flattened, leading to the loss of some characteristic features. Thereby, a bias in taxonomic and phylogenetic studies would occur when such studies were based on these fruit fossils. In this study, we present the first quantitative three-dimensional reconstruction of compressed <em>Trapa</em> fruit fossils to restore their original morphology prior to burial. This approach provides a novel perspective for the identification and classification of compressed fruit fossils. The three-dimensional reconstruction of <em>Trapa</em> fruit fossils enabled accurate comparisons with extant species. We subsequently identified it as a new species, named <em>Trapa</em> <em>radiatiformis</em> L. Xiao sp. nov., revealing differences from previously known taxa of <em>Trapa</em>. Importantly, our comparison suggests that the long lower horns and residual stalk may represent inherent characteristics of early <em>Trapa</em> fruits. However, these traits gradually degenerated during fruit evolution, resulting in morphological simplification during geological time. <em>T. radiatiformis</em> with primitive features exhibits good resemblance to <em>Trapa</em> <em>natans</em> fruit characteristics, which means it may be an ancestor of <em>T. natans.</em> We summarize the palaeogeographic distribution of fossil <em>Trapa</em> using previously published literature and demonstrate that the genus was most prosperous in the Miocene and exhibited the same distribution as that at present. Additionally, through detailed morphological comparisons between <em>Trapa</em> and <em>Hemitrapa</em> fruits, along with phylogenetic analysis within the <em>Primotrapa</em> genus itself, we propose a homology between <em>Trapa</em> and <em>Hemitrapa</em>, suggesting that they could have a common ancestor.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 954-970"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Provenance and tectonic setting of sandstones of the Lomas Coloradas Formation, Cabullona Group, Sonora, México: Constraints on petrography and geochemistry","authors":"J. Madhavaraju ,&nbsp;D.G. Noriega-Montoya ,&nbsp;E. Ramirez-Montoya ,&nbsp;C.M. González-León ,&nbsp;John S. Armstrong-Altrin","doi":"10.1016/j.jop.2024.07.005","DOIUrl":"10.1016/j.jop.2024.07.005","url":null,"abstract":"<div><div>The sedimentary rocks of the Cabullona Group are well exposed in the Cabullona Basin of northeastern Sonora, México, which represent syntectonic sedimentation associated with Laramide-style deformation during the Campanian−early Maastrichtian. The sandstones of the Lomas Coloradas Formation deposited at the upper part of the Cabullona Group. Petrography and geochemical (major, trace, and rare earth elements) studies were carried out on the sandstones to interpret the palaeoweathering, provenance, and tectonic setting of the Lomas Coloradas Formation sandstones. Most of the sandstone modal analysis data plotted in the QFL and QmFLt ternary diagrams fall into the fields of dissected arcs and recycled orogens, respectively. Geochemically the sandstones are classified as litharenites while few samples plot into the arkosic field. The chondrite-normalized REE diagrams for sandstones have LREE-enriched, relatively flat HREE patterns with negative Eu anomalies. CIA values and the A‒CN‒K diagram indicate a low intensity of chemical weathering in the source area. The tectonic setting diagram suggests both arc and rift settings for the studied sandstones. The bivariate and ternary diagrams and elemental ratios suggest a felsic source for the Lomas Coloradas Formation. The average REE patterns of the studied sandstones are comparable with REE patterns of the granite from the Caborca block, the rhyolite and granite of the Tarahumara Formation, and the Mesozoic felsic volcanic rocks. The modeled mixture of 40% Proterozoic granite, 30% Triassic arc, 10% Jurassic arc, and 20% Laramide arc represents the probable source rocks for the Lomas Coloradas Formation.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 839-861"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of a confined gravelly river to a braided-meandering river in the Late Cretaceous Khasi group, southern Shillong plateau, NE India","authors":"Adrita Choudhuri ,&nbsp;Prem Raj Uddandam ,&nbsp;Debarati Nag","doi":"10.1016/j.jop.2024.08.003","DOIUrl":"10.1016/j.jop.2024.08.003","url":null,"abstract":"<div><div>This paper intends to unravel the depositional condition of the Basal Conglomerate/Jadukata Formation and the Lower Mahadek Formation in southern Shillong Plateau, NE India deposited during the Late Cretaceous period. The studied succession is entirely siliciclastics in composition and was built up on the Precambrian basement rocks. State-of-art facies analysis and palaeocurrent evidence helped us to reconstruct the palaeogeography and palaeoenvironment. The facies tracts reveal that frequent hyperconcentrated mass flow deposits dominated the proximal part of the river channels. Gradually, the river evolved to a sandy braided and finally mud-dominated, meandering system. The river channel changed its pattern through onlapping and progressive elimination of the accommodation space created by the tectonic subsidence/upliftment. Major shifts in palaeocurrent direction at different stages of the river evolution confirm the role of tectonics on the river channel evolution. QFL detrital modes of the sandstones reflecting lithic wacke composition and the recycled orogeny corroborate the interpretation. Rapid lateral and vertical facies transition suggests a pull-apart type basin due to ongoing rifting. Geochemical analyses also show signatures of the overlapping tectonic conditions supporting the pull-apart basin model.</div></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 4","pages":"Pages 754-774"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Higher palaeoelevation in the Baoshan Basin: Implications for landscape evolution at the southeastern margin of the Tibetan Plateau","authors":"Yong-Jiang Huang ,&nbsp;Hao-Ran Zong ,&nbsp;Shi-Tao Zhang ,&nbsp;Arata Momohara ,&nbsp;Jin-Jin Hu ,&nbsp;Lin-Bo Jia ,&nbsp;Yun-Heng Ji ,&nbsp;Zhe-Kun Zhou","doi":"10.1016/j.jop.2024.05.004","DOIUrl":"10.1016/j.jop.2024.05.004","url":null,"abstract":"<div><p>Surface uplift at the southeastern margin of the Tibetan Plateau has been widely studied, but more palaeoaltimetry data are required to better understand the elevation history of this geologically complex region. In this study, fossil leaves of <em>Abies</em> (Pinaceae), a cool-temperate element, recovered from the latest Miocene–Pliocene Yangyi Formation of the southern Baoshan Basin, were used as a proxy to estimate the local palaeoelevation. Based on the regional modern altitude range (2100–4280 m) of the genus as well as regional temperature discrepancy (1.5 °C) between the past and present, the palaeoelevation of the study area was calculated to be &gt; 2360 m above sea level as compared to 1670 m at present. Our result suggests that the southern Baoshan Basin experienced pronounced uplift prior to the time of fossil deposition, probably as a result of crustal shortening and thickening of the northern Baoshan Terrane during the Eocene–Oligocene. We infer that surface growth in areas south of the Dali Basin may have been greater than previously interpreted, and that a widespread plateau or plateau patches higher than 2000 m probably extended southwards into at least the Baoshan Basin by the latest Miocene–Pliocene. We also infer that the elevation of the southern Baoshan Basin has decreased by at least 690 m since then, in contrast to most other scenarios in which the elevation of the southeastern margin of the Tibetan Plateau has increased or remained close to modern levels since the late Miocene. The major cause of the inferred altitude decline is likely tectonic deformation. As a transtensional graben basin, the Baoshan Basin has experienced pull-apart and base-fall movement since the late Miocene, which would reduce the altitude of its southern part located on the hanging wall. Surface erosion associated with the increased summer rainfall might also have played a role especially in reducing the local relief, although its contribution can be limited. Our study provides one of the few palaeoelevation estimates from areas south of the Dali Basin and an example of past elevation loss at the southeastern margin of the Tibetan Plateau, thus shedding important light on the landscape evolution of this region.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 3","pages":"Pages 563-580"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095383624000440/pdfft?md5=944df30db3f6cb70de35209df35e5bf1&pid=1-s2.0-S2095383624000440-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141278008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sedimentary facies analysis of a thin-bed-dominated turbidite succession in the Miocene Temburong Formation, Kampung Bebuloh, Labuan Island, Malaysia","authors":"Farah Syafira Burhanuddin,&nbsp;Meor Hakif Amir Hassan","doi":"10.1016/j.jop.2024.04.005","DOIUrl":"10.1016/j.jop.2024.04.005","url":null,"abstract":"<div><p>Thin-bedded turbidites are important hydrocarbon-bearing reservoirs in many mature fields throughout the world. The type of turbidite depositional setting strongly influences vertical and horizontal continuity of the reservoir. However, distinguishing between lobe and levee associated thin-bedded turbidites remains challenging due to their generally similar facies characteristics. This study aims to contribute some insights to this problem by conducting a detailed bed-scale facies analysis on the Early Miocene Temburong Formation exposed at Kampung Bebuloh, Labuan Island, Malaysia, which may uncover features that can help in differentiating between both depositional types. Six facies are recognized in the Temburong Formation, which are interpreted as low density turbidites (F1–F4), hybrid event beds (F5), and sustained turbidites (F6). Detailed facies and ichnology analysis reveal features which are consistent with a lobe fringe deposit rather than levee-associated environment interpretation, including tabular bed geometries, presence of hybrid event beds, and the absence of thick-bedded channel-fill sandstones. Five facies associations are identified and interpreted as representing sub-environments within an overall lobe depositional setting. A diverse trace fossil assemblage, comprising the <em>Nereites</em> ichnofacies is consistent with a deep marine environment. Further identification of the <em>Paleodictyon</em> and <em>Nereites</em> sub-ichnofacies indicates a distal turbidite system setting, most likely lobe fringe. Based on the thick accumulation of FA2 and FA3 and no distinct observable vertical trend, the Early Miocene Temburong Formation in Labuan is interpreted as turbidites deposited at the fringes of lobe complexes rather than a single lobe fringe. Earlier works into the Temburong Formation in SW Labuan proposed a middle slope to proximal basin floor setting where the thin-bedded intervals were interpreted as potentially representing either levee deposits or the fringes of confined lobe deposits. Conversely, the Temburong Formation at Kampung Bebuloh exhibits characteristics of an unconfined lobe setting, suggesting an evolutionary change in depositional conditions over time.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 3","pages":"Pages 401-429"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095383624000324/pdfft?md5=63453d549f702c0aa5250586837b18e3&pid=1-s2.0-S2095383624000324-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Devonian ostracods from Jiwozhai patch reef (Dushan, Guizhou Province, South China): Biostratigraphic and palaeoecological implication","authors":"Jun-Jun Song ,&nbsp;Jia-Yuan Huang ,&nbsp;Wen Guo ,&nbsp;Kun Liang ,&nbsp;Yu-Cong Sun ,&nbsp;Zhi-Hong Wang ,&nbsp;Wen-Kun Qie","doi":"10.1016/j.jop.2024.06.001","DOIUrl":"10.1016/j.jop.2024.06.001","url":null,"abstract":"<div><p>The Middle Devonian ostracods from the Jiwozhai patch reef in Dushan, Guizhou Province, South China were described for the first time in this study. Twenty-nine species belonging to 20 genera were identified and figured, including a new species named <em>Wangshangkia jiwozhaiensis</em> sp. nov. The ostracod fauna in the Jiwozhai patch reef represents a Givetian age. The ostracod assemblage belongs to the smooth-podocopid association, which is also ecologically equivalent to the Eifelian Mega-Assemblage III. This association is indicative of shallow open-marine environments. The Jiwozhai patch reef fauna is primarily comprised of suspension feeders, including filter-feeding ostracods, corals, brachiopods and bryozoans. Ostracods from the Jiwozhai patch reef were compared to the ostracod faunas from Laurentia–Baltica at generic level, which reveals limited faunal exchanges between South China and Laurentia–Baltica during the Middle Devonian.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 3","pages":"Pages 581-593"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095383624000452/pdfft?md5=476484be9397c03de0cce16bfceb0ae2&pid=1-s2.0-S2095383624000452-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141401712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of iron-rich minerals, ooids and pisoids in the Jurassic ooidal ironstones of the Labino-Malkin region (Caucasus)","authors":"Natalia A. Kalinina ,&nbsp;Maxim A. Rudmin ,&nbsp;Mikhail Sherstyukov ,&nbsp;Prokopiy Maximov ,&nbsp;Abdul-Gapur Kerimov","doi":"10.1016/j.jop.2024.04.003","DOIUrl":"10.1016/j.jop.2024.04.003","url":null,"abstract":"<div><p>This study investigates the Middle Jurassic rocks of the Labino-Malkin zone (Caucasus), represented by ooidal ironstones, biogenic limestones, and nodular phosphorites. All rocks contain ooids/pisoids. Based on the mineral composition, nine types of ooids and three possible scenarios for their formation have been identified. The mineral composition of ooids indicates the variable conditions of their deposition and repeated changes in physical and chemical conditions of the environment, including fluctuations in theredox regime. The access of oxygen in the bottom environment as a factor of increasing oxic conditions was associated with the regression of the sea and/or the inflow of meteoric waters. The main sources of ooids are the drift of material from the continent and convecting metal-bearing meteoric and/or deep solutions.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 3","pages":"Pages 475-494"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095383624000336/pdfft?md5=29003ed081a17578737b25d182cc3aa3&pid=1-s2.0-S2095383624000336-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}