Journal of Palaeogeography最新文献

{"title":"Early Cretaceous shifting of Zoophycos in the Ouarsenis Mountains (northwestern Algeria)","authors":"Imad Bouchemla ,&nbsp;Li-Jun Zhang ,&nbsp;Madani Benyoucef ,&nbsp;Mariusz A. Salamon","doi":"10.1016/j.jop.2023.08.001","DOIUrl":"https://doi.org/10.1016/j.jop.2023.08.001","url":null,"abstract":"<div><p>Early Cretaceous succession of the Oued Fodda Formation in the Ouarsenis Mountains (northwestern Algeria) is mainly composed of marl–limestone alternations, which are subdivided into four informal units (Units 1 to 4), based on distinct lithological, stratonomical, and ichnological features. The ichnological analysis reveals a low diversity of the trace-fossil assemblage, which is exclusively reported from Units 2 and 3. The ichnoassemblage contains six ichnotaxa (<em>Chondrites intricatus, Ophiomorpha</em> isp., <em>Planolites</em> isp., <em>Thalassinoides</em> isp., <em>Zoophycos brianteus</em>, and <em>Zoophycos cauda-galli</em>), among which <em>Zoophycos</em> and <em>Chondrites</em> are the most common elements of the assemblage and occur in distinct mud-rich substrates showing different bioturbation intensities. The development of <em>Zoophycos</em> in the middle part of Unit 2 shows a high degree of bioturbation (bioturbation index (BI) = 4). <em>Zoophycos</em> specimens are of large size, between 45 cm and 75 cm in width, which were interpreted to have formed in a lower offshore environment where the oxygenation amount was optimal, the sedimentation rate was low, and the benthic food was abundant on the seafloor. Toward the upper part of Unit 2, <em>Zoophycos</em>-bearing levels exhibit a less intense degree of bioturbation (BI between 1 and 2) in contrast to <em>Planolites</em>- and <em>Chondrites</em>-bearing levels which have a bioturbation index (BI) between 3 and 4. At these levels, <em>Zoophycos</em> displays relatively small, coiled to U-shaped spreiten, probably in response to stressful and dysoxic conditions prevailing in the water bottom. With improved oxygenation in a quiet lower offshore to shelf margin environment in Unit 3, the benthic organisms recovered, as represented by medium to large size <em>Zoophycos</em> in association with <em>Ophiomorpha</em> and scarce <em>Chondrites</em> burrows, even if the overall bioturbation intensity is very low. The combination of trace-fossil assemblage and lithofacies of the Oued Fodda Formation indicates relatively stable outer shelf environments below the storm wave base, which corresponds classically to the lower offshore to shelf edge environments, and the prevailing palaeoecological conditions are optimal and stressful for the benthic organisms.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 4","pages":"Pages 603-623"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71782457","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":"A case study on how astronomical cycles affect the organic carbon accumulation","authors":"Yang Li ,&nbsp;Ren-Chao Yang ,&nbsp;Carlos Zavala ,&nbsp;Liang Dong ,&nbsp;Valentin Trobbiani","doi":"10.1016/j.jop.2023.09.001","DOIUrl":"https://doi.org/10.1016/j.jop.2023.09.001","url":null,"abstract":"<div><p>The paleoclimate change impacts the sedimentary environment and process, which in turn control the accumulation of organic carbon. Numerous studies have shown that the paleoclimate is controlled by astronomical cycles. Hence, understanding how these cycles impact the accumulation of organic carbon is a critical question that requires in-depth discussion. Previous studies have shown that Milankovitch cycle can be revealed from the sediments of the 7^th Oil Member (Chang 7 Member for short) of the Triassic Yanchang Formation in the southern Ordos Basin, suggesting that the deposition was controlled by astronomically-forced climate changes. Building on previous research, this study collected natural gamma (GR) data of Chang 7 Member from the N36 Well to further analyze astronomical cycles, combined with X-ray fluorescence (XRF) analysis and total organic carbon (TOC) tests, to reconstruct the paleoenvironment and analyze the organic matter enrichment characteristics. The results of this contribution show that, paleoclimate, paleo-redox conditions, paleo-water level, paleo-productivity and sediment accumulation rate (SAR) collectively controlled the enrichment of organic matter. Notably, this study identified the presence of eccentricity, obliquity, precession, and the 1.2 Myr long obliquity cycle in the Chang 7 Member. These cycles controlled the paleoenvironmental changes at different timescales and influenced the enrichment of organic matter, which has implications for subsequent energy exploration.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 4","pages":"Pages 637-651"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71782455","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":"Late Pleistocene spore-pollen record and climatic change at the Chongphadae Cave Site, Democratic People's Republic of Korea","authors":"Se Chan Kim,&nbsp;Rye Sun Choe,&nbsp;Il Nam Kim,&nbsp;Chol U,&nbsp;Ryong Il Kang","doi":"10.1016/j.jop.2023.07.001","DOIUrl":"https://doi.org/10.1016/j.jop.2023.07.001","url":null,"abstract":"<div><p>We present a detailed pollen record and interpretations of late Pleistocene climatic change at the Chongphadae Cave Site, Democratic People's Republic of Korea. The mean annual paleotemperature and mean annual paleoprecipitation of the site were calculated using the temperature index and precipitation index based on ecological features and geographical distribution of each taxon. Temperature index and precipitation index range from 8.8 °C to 10.4 °C and from 805.0 mm to 963.1 mm, respectively. Four dates (radiocarbon, uranium series, fission track, and paleomagnetic excursion dating) of the deposit profile investigated yield a range of ∼21.3 ka BP to ∼117 ka BP, geochronologically corresponding to the late Pleistocene, and extend from the last interglacial highstand through the Last Glacial Maximum. Our results are thus consistent with the climatic shift from interglacial to glacial conditions, provide evidence that the environments of the region, which was reconstructed from the paleoclimatic index, changed from a mild and humid to a cool and dry climate during the late Pleistocene, and suggest trends similar to those of several parts of the Northern Hemisphere which lie in the same latitudinal zone as our study area.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 4","pages":"Pages 624-636"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71782456","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":"Palaeogeographical development of two merging delta systems (Eocene Shahejie Formation) in the Bohai Bay Basin, E China and implications for hydrocarbon exploration","authors":"Ren-Chao Yang ,&nbsp;Yang Li ,&nbsp;Ai-Ping Fan ,&nbsp;A.J. Van Loon (Tom) ,&nbsp;Jin Li ,&nbsp;Zuo-Zhen Han ,&nbsp;Jie Chen","doi":"10.1016/j.jop.2023.08.003","DOIUrl":"https://doi.org/10.1016/j.jop.2023.08.003","url":null,"abstract":"<div><p>Two deltas developed simultaneously during the Eocene on the eastern side of a large lake that existed in the Dongying Sub-basin, which forms part of the Bohai Bay Basin in eastern China. The rivers that built the deltas had different catchment areas, which resulted in sediments with different permeability and porosity, due to differences in sorting and mud content. Both deltas prograded, and mass flows that originated frequently on their fronts formed lobes that expanded laterally. This eventually led to merging of both deltas, a feature that has rarely been described from ancient deposits thus far. Core analysis and seismic reflection data show that the merging of the two deltas took place in nine phases, determined by phases of slower progradation or even temporary retrogradation in between. The alternation of sediments from both deltas and their eventual mixing makes the architecture of the merged deltas much more complex than that of ‘classical’ single deltas. This affects the predictability of the spatial distribution of possible reservoir characteristics significantly, but detailed core analysis shows that the best hydrocarbon reservoirs consist of sand bodies formed in distributary channels on the delta plains, and of sandy turbidites formed in the deep-lacustrine environment in front of the merged deltas.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 4","pages":"Pages 564-586"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71782552","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":"Early Cretaceous shifting of Zoophycos in the Ouarsenis Mountains (northwestern Algeria)","authors":"Imad Bouchemla, Li‐Jun Zhang, M. Benyoucef, M. Salamon","doi":"10.1016/j.jop.2023.08.001","DOIUrl":"https://doi.org/10.1016/j.jop.2023.08.001","url":null,"abstract":"","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88571487","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":"Late Pleistocene spore-pollen record and climatic change at the Chongphadae Cave Site, Democratic People’s Republic of Korea","authors":"Se Chan Kim, R. S. Choe, Il-Nam Kim, Chol U, R. Kang","doi":"10.1016/j.jop.2023.07.001","DOIUrl":"https://doi.org/10.1016/j.jop.2023.07.001","url":null,"abstract":"","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85869414","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":"Microfacies and paleoenvironment of microbialites of the Cambrian (Stage 4) Qingxudong Formation in the Huayuan area, northwestern Hunan Province, southern China","authors":"Zhongtang Su, De-Min Zhang, Jie Tang, Pei-Jie Sun, Zhen-Feng Luo, Hui Ma","doi":"10.1016/j.jop.2023.07.004","DOIUrl":"https://doi.org/10.1016/j.jop.2023.07.004","url":null,"abstract":"","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81511635","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":"The unexpected occurrence of enigmatic ‘percevalicrinids’ (Echinodermata, Crinoidea) in the Lower Jurassic strata of North Africa — Implications for their stratigraphic and palaeogeographic distribution and discussion on their belonging to the subfamily Balanocrininae","authors":"Mariusz A. Salamon ,&nbsp;Madani Benyoucef ,&nbsp;Karolina Paszcza ,&nbsp;Fayçal Mekki ,&nbsp;Imad Bouchemla ,&nbsp;Bartosz J. Płachno","doi":"10.1016/j.jop.2023.05.002","DOIUrl":"https://doi.org/10.1016/j.jop.2023.05.002","url":null,"abstract":"<div><p>The marl and limestone alternations of the Lower Jurassic Ain Ouarka and Ain Rhezala formations (Pliensbachian–Toarcian) in the western Saharan Atlas, Northwest Algeria, yield a diverse micro- and macrofauna, including moderately numerous crinoids, which are represented by remains of isocrinids, i.e., <em>Balanocrinus ticinensis</em> Hess and columnals of the genus <em>Percevalicrinus</em>. So far, the latter genus has been observed from the Upper Jurassic–Lower Cretaceous strata of Eurasia, North America, and the African continent. Thus, the present find is the oldest record of this crinoid genus, and the second one from the southern Tethyan margin. In this paper, it is shown that <em>Percevalicrinus</em>, which is traditionally regarded as a representative of the subfamily Balanocrininae, displays several features of the subfamily Isocrininae. The crinoid assemblage and associated facies and invertebrate fauna are typical of a low-energy deep outer shelf/ramp (below the storm wave-base) setting.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 3","pages":"Pages 434-447"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49890615","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 sedimentation and palaeogeographic reconstruction in the Poso Depression, Central Sulawesi, Indonesia: from a sea channel to a land bridge","authors":"Abang Mansyursyah Surya Nugraha ,&nbsp;Ramadhan Adhitama ,&nbsp;Adam D. Switzer ,&nbsp;Robert Hall","doi":"10.1016/j.jop.2023.05.003","DOIUrl":"https://doi.org/10.1016/j.jop.2023.05.003","url":null,"abstract":"<div><p>The Poso Depression provides a record of Plio-Pleistocene environments and palaeogeography of Central Sulawesi. Outcrop-based sedimentological and provenance studies suggest that during the Pliocene the Poso Depression was a sea channel connecting Gorontalo and Bone bays formed in an asymmetric half-graben. The Pliocene history began with deposition of the Puna Formation with fan deltas at the eastern basin margin and channel complexes in the deep-water basin further east. Analyses of light and heavy minerals indicate the main sediment source was ultrabasic rocks in East Sulawesi with minor and intermittent magmatic and metamorphic input from West Sulawesi. Later, in the Middle to Late Pliocene, carbonates of the Poso Formation accumulated on the eastern basin margin. They are unconformably overlain by shallow marine glaucophane-rich siliciclastics of the Pleistocene Lage Formation that are associated with the rapid exhumation and uplift of the Pompangeo metamorphic complex. This uplift led to the development of a land bridge connecting western and eastern Sulawesi. The terrane evolution favoured increasing the area of exposed land due to rapid tectonic uplift, which when combined with the tropical climate, contributed to faunal speciation and dispersal in Sulawesi.</p></div>","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"12 3","pages":"Pages 331-357"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49890620","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":"Diagenesis, facies and palaeocurrent analysis of Upper Rewa Sandstone around Sagar, Central India","authors":"G. K. Singh, A. Rai, Arvind P. Singh","doi":"10.1016/j.jop.2023.07.003","DOIUrl":"https://doi.org/10.1016/j.jop.2023.07.003","url":null,"abstract":"","PeriodicalId":100819,"journal":{"name":"Journal of Palaeogeography","volume":"459 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77460013","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}