Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"143Nd/144Nd and 87Sr/86Sr isotopic records coupled with foraminiferal δ18O and δ13C reveals dynamic oceanographic settings following the Middle Miocene (Badenian) salinity crisis in Central Europe","authors":"Filip Scheiner ,&nbsp;Katarína Holcová ,&nbsp;Danuta Peryt ,&nbsp;Lukáš Ackerman ,&nbsp;Tadeusz Marek Peryt","doi":"10.1016/j.palaeo.2025.112923","DOIUrl":"10.1016/j.palaeo.2025.112923","url":null,"abstract":"<div><div>The Middle Miocene salinity crisis in Central Europe and the Middle East is an example of a profound environmental transition in marine ecosystems resulting from the complex interplay of climatic and palaeoceanographic changes during the Middle Miocene. In this study, we use a combination of multi-proxy methods to reconstruct the environmental dynamics in Central Europe, right after the evaporitic depositional period, utilising material from two cores, Babczyn 2 and Cieszanów 1, located in the Polish part of the Carpathian Foredeep. From this perspective, understanding the environmental response to such changes is particularly relevant in the context of the unique palaeogeographic setting of Central Europe during the Middle Miocene, together with the final stage of existence of the Paratethys marine system, and the associated faunal turnaround known as the Badenian-Sarmatian extinction event. This study identifies and characterises a post-evaporitic phase marked by alternating different palaeoenvironments as reflected by the response of the various geochemical proxies, namely ¹⁴³Nd/¹⁴⁴Nd, ⁸⁷Sr/⁸⁶Sr, or by foraminiferal δ¹⁸O and δ¹³C. In general, periods of active communication, or at least exchange of water masses between neighbouring basins, alternated with periods of isolation, reflecting local and global triggering factors, all linked to three individual connectivity events.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"670 ","pages":"Article 112923"},"PeriodicalIF":2.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic environment but no temperature change since the late Paleogene at Lühe Basin (Yunnan, China)","authors":"Caitlyn R. Witkowski ,&nbsp;Vittoria Lauretano ,&nbsp;Alex Farnsworth ,&nbsp;Shu-Feng Li ,&nbsp;Shi-Hu Li ,&nbsp;Jan Peter Mayser ,&nbsp;B. David A. Naafs ,&nbsp;Jingyi Wei ,&nbsp;Robert A. Spicer ,&nbsp;Tao Su ,&nbsp;He Tang ,&nbsp;Zhe-Kun Zhou ,&nbsp;Paul J. Valdes ,&nbsp;Richard D. Pancost","doi":"10.1016/j.palaeo.2025.112920","DOIUrl":"10.1016/j.palaeo.2025.112920","url":null,"abstract":"<div><div>The complex tectonic evolution in the Tibetan region has impacted climate, the Asian monsoon system, and the development of major biodiversity hotspots, especially since the onset of the India-Eurasia continental collision during the early Paleogene. Untangling the links between the geologic, climatic, and ecological history of the broader region provides insights into key Earth system mechanisms, relevant for understanding our rapidly changing planet. Notably around this time, the Eocene-Oligocene transition (EOT; ∼34 million years ago, Ma) marked a critical shift from a greenhouse to an icehouse climate. Whereas temperatures derived from benthic marine records show ubiquitous global cooling of 4 °C, there is an emerging picture that sea surface temperatures and the terrestrial realm experienced a heterogenous response across this interval. Here, we reconstruct a terrestrial temperature record from ∼35–27 Ma at a tectonically unresolved location at the margins of the Tibetan Plateau, Lühe Basin (Yunnan, China). Our multi-proxy organic geochemistry approach across a 340-m long section, complemented by sedimentological interpretations, climate model results, and palaeobotany-based estimates at a nearby site, shows that Lühe Basin hosted a dynamic fluvial environment that maintained relatively stable average temperatures across this 8-million-year interval. The lack of cooling at Lühe Basin supports evidence that sea surface temperatures and terrestrial sections had a complex and heterogenous response across the EOT despite the ubiquitous 4 °C cooling trends seen in the benthic marine record. Furthermore, these palaeotemperature estimates match present-day values at this location, suggesting that this area has not undergone significant temperature change – and possibly no significant uplift – since the late Paleogene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112920"},"PeriodicalIF":2.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Upper Jurassic benthic foraminiferal assemblages of the Charentes-Maritimes region (Atlantic Coast, France) and their answer to climate changes","authors":"C.P.A.M. Colpaert ,&nbsp;O. Friedrich ,&nbsp;C. Colombié","doi":"10.1016/j.palaeo.2025.112921","DOIUrl":"10.1016/j.palaeo.2025.112921","url":null,"abstract":"<div><div>This study is based on the Upper Jurassic successions of the La Rochelle Platform (western France). There, sedimentary sequences are characterised by periodic changes in depositional environments, inferred from the alternation of calcareous marlstones and limestones and the occurrence of tempestites. The structure and dynamic changes of the benthic foraminiferal assemblages were studied and compared to sedimentological and geochemical proxies in order to detect periodic changes in the ocean/climate system and their effects on microbenthos assemblages. This study was combined with an analysis of the foraminiferal preservation. In the upper Kimmeridgian <em>Aulacostephanus mutabilis</em> and <em>Aulacostephanus eudoxus</em> ammonite zones, high abrasion and dissolution of the tests indicate that benthic foraminifers may have been reworked by bottom currents or by wave energy, a result consistent with the local occurrence of tempestites. More generally, the low diversity of the studied benthic foraminiferal assemblages and the occurrence of highly dominant agglutinated taxa suggest that they were originating from a shallow-water environment. In particular, two blooms of species of the genus <em>Haplophragmoides</em>, identified in the Kimmeridgian <em>Epaspidoceras rupellensis</em> and <em>A. eudoxus</em> ammonite zones, are interpreted to result from the development of highly vegetated biomes close to the coast. These intervals are successfully correlated to geochemical indicators that infer more humid climatic conditions. The stratigraphic distribution of selected benthic foraminiferal species shows significant similarities with the Subboreal foraminiferal biozonation as it has been proposed for the English Channel and adjacent areas. The upper Kimmeridgian foraminiferal assemblages are characterised by an increased proportion of typical species for the Subboreal and Boreal realms. This result is in congruency with geochemical and mineralogical data from the Kimmeridgian North Aquitaine Platform, which indicate a change in oceanic circulation from northward warm to southward cold streams during the lower Kimmeridgian <em>E. rupellensis</em> ammonite Zone. This result further supports an existing climate model simulation in which the observed divergence between (1) pollen assemblages, reflecting periodic warm and arid conditions, and (2) seawater temperature estimates derived from marine organisms indicating cold conditions, is most likely related to extensional tectonic activity and to the late Kimmeridgian Proto-North Atlantic seaway opening.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112921"},"PeriodicalIF":2.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comment on “Uppermost Permian to Lower Triassic conodont biostratigraphy and carbon isotope records from Southern Armenia” by Chen Han et al. [Palaeogeography, Palaeoclimatology, Palaeoecology, 667 (2025), 112,870]","authors":"Micha Horacek ,&nbsp;Yuri Zakharov ,&nbsp;Leopold Krystyn ,&nbsp;Aymon Baud ,&nbsp;Araik Grigoryan","doi":"10.1016/j.palaeo.2025.112912","DOIUrl":"10.1016/j.palaeo.2025.112912","url":null,"abstract":"<div><div>Han et al. (2025) claim to provide an improved conodont biostratigraphy and carbon isotope records for the uppermost Permian and Lower Triassic succession in Southern Armenia. Specifically, they present results from the Permian-Triassic boundary (PTB) at the Chanakhchi and Vedi II sections and from the Induan-Olenekian boundary (IOB) at the Ogbin II section. However, the conodont and isotope stratigraphy for the PTB does not show any substantial improvement, and discrepancies with earlier works are not discussed. Furthermore, no serious attempt to solve these discrepancies through larger-scale sampling is made. Consequently, this led Han et al. (2025) to detect the PTB only above the first microbialite layers following the Boundary Clay at Chanakhchi section and the indication of the PTB at the Vedi II section with the FAD of <em>I. isarcicella</em>. For the identification of the IOB no unequivocal proxies were used such that the placement of the boundary remains uncertain and ambiguous. Thus, the claim to improve and refine the stratigraphy in the uppermost Permian and Lower Triassic from Armenia is not achieved.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112912"},"PeriodicalIF":2.6,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 effectiveness of oxygen isotopes in Spinosaurus tooth dentine for high-resolution palaeoenvironmental reconstructions","authors":"Zuorui Liu ,&nbsp;Amy L. Prendergast ,&nbsp;Russell Drysdale ,&nbsp;Kelsie Long ,&nbsp;Jan-Hendrik May","doi":"10.1016/j.palaeo.2025.112908","DOIUrl":"10.1016/j.palaeo.2025.112908","url":null,"abstract":"<div><div>Oxygen isotope compositions in tooth dentine of <em>Spinosaurus aegyptiacus</em> were investigated as a potential proxy for high-resolution reconstructions of palaeoenvironments in Cenomanian Cretaceous Morocco. The dentine was sampled sequentially along the tooth growth direction, and the successive δ¹⁸O values exhibited cycles which likely tracked the oxygen isotope compositions of ingested water and inferred changes in additional palaeoenvironmental properties. A conceptual model of catchment palaeohydrology was reconstructed to explain the mechanisms of isotopic variation. Seasonally variable water balance in the catchment or changes in water sources throughout the extensive deltaic environments are the most likely explanations for the seasonal profiles. With analysis of isotopic change in the conceptual model and comparison with data of modern tropical and subtropical deltas, we found similarities between palaeoclimates and modern data, and effectively identified the wet and dry seasons represented by troughs and peaks in the δ¹⁸O curves. These preliminary results demonstrated that palaeoenvironmental information at sub-seasonal resolution can be well preserved in theropod tooth dentine. The methodology developed in this study can be applied to the existing abundant reserves of theropod teeth to construct a Mesozoic palaeoclimatic database.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112908"},"PeriodicalIF":2.6,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of denudation during the growth of a thrust-fold range: A case study from the Yumu Shan, NE Tibetan Plateau","authors":"Jiakun Wu ,&nbsp;Qiming Zhao ,&nbsp;Baotian Pan ,&nbsp;Darryl E. Granger ,&nbsp;Zhenling Wen ,&nbsp;Jiaxin Zhang","doi":"10.1016/j.palaeo.2025.112909","DOIUrl":"10.1016/j.palaeo.2025.112909","url":null,"abstract":"<div><div>Understanding the spatio-temporal pattern of denudation rates is critical for elucidating the impact of tectonics and climate on the landscape evolution of active thrust-fold ranges. The Yumu Shan, located on the northeastern margin of the Tibetan Plateau, is a typical example of a young and active thrust-fold range. The late Cenozoic sediments surrounding the range have recorded the history of denudation since its initial uplift at ∼3 Ma. By analyzing the lithology, roundness, and clast orientation of gravel sediments on the northern flank, in combination with cosmogenic nuclide burial dating and apatite fission track (AFT) thermochronology, we have reconstructed the denudation history and changes of denudation rates in the Yumu Shan since 3 Ma. The results reveal that the denudation rates in the main range of the Yumu Shan were greater than 400 mm/ka during 3.0–1.8 Ma. Since 1.8 Ma, the rate of denudation decreased rapidly to ∼60–140 mm/ka, followed by a slight increase to ∼100–220 mm/ka after 1.0 Ma. By comparing these rates with potential controlling factors, such as rock uplift and climate, we conclude that the change in bedrock resistance was the primary factor driving the rapid decrease in denudations rates between 3.0 and 1.0 Ma, while the increase in topographic relief due to tectonic deformation likely controlled the gradual rise in denudations rates since 1.8 Ma. Furthermore, by comparing with other active thrust-fold ranges worldwide, we propose a simplified spatio-temporal evolution model for denudation rates in active thrust-fold ranges. This model provides a framework for understanding the relationship between the tectonic, climate and surface processes in such regions.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112909"},"PeriodicalIF":2.6,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Early Oligocene Asian monsoon: Evidence from the Fuping flora of Baise, Guangxi, low-latitude China” [Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 662, 15 March 2025, 112783]","authors":"Qiaoyi Ma ,&nbsp;Yusheng (Chris) Liu ,&nbsp;Qijia Li ,&nbsp;Cheng Quan","doi":"10.1016/j.palaeo.2025.112900","DOIUrl":"10.1016/j.palaeo.2025.112900","url":null,"abstract":"","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112900"},"PeriodicalIF":2.6,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palaeogeographic and stratigraphic significances of Fortunian small skeletal fossils from the southern Shennongjia Region (China)","authors":"Lei Yang ,&nbsp;Ben Yang ,&nbsp;Xiaodong Shang ,&nbsp;Michael Steiner","doi":"10.1016/j.palaeo.2025.112910","DOIUrl":"10.1016/j.palaeo.2025.112910","url":null,"abstract":"<div><div>Situated on the northern margin of Yangtze Block, the Shennongjia Region is divided into southern and northern parts by the Yangri Fault and has attracted significant interest for understanding the collisional history of the Yangtze Craton. Traditionally, both regions were thought to lack the earliest Cambrian strata. Here, we report the discovery of Fortunian small skeletal fossils (SSFs) and phosphatized algal fossils from the lower Yanjiahe Formation (traditionally referred to as the Xihaoping Member) in the southern Shennongjia Region. These fossils are assigned to established SSF biozones of the Yangtze Platform, specifically the <em>Anabarites trisulcatus</em>–<em>Protohertzina anabarica</em> Assemblage Zone and the <em>Paragloborilus subglobosus</em>–<em>Purella squamulosa</em> Assemblage Zone, thereby confirming the presence of Fortunian strata in the southern Shennongjia Region. The composition of these assemblages shows strong similarity to those in other parts of the Yangtze Block, such as the Three Gorges area, northern Sichuan, and southern Shaanxi. In contrast, the absence of this Fortunian fauna in the Zhenba-Fangxian Block suggests the existence of a denudation zone during the early Cambrian. This denuded zone lies between the outer shelf facies of the South Qinling Orogenetic Belt and the onshore facies of traditional Yangtze Block, highlighting the distinct palaeogeographic position of this tectonically unique region.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112910"},"PeriodicalIF":2.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleomonsoon variability during the past seven centuries: Insights from a northwest Himalayan lake","authors":"Sreya Sengupta ,&nbsp;Anil Kumar Gupta ,&nbsp;Pankaj Kumar ,&nbsp;Prasanta Sanyal ,&nbsp;Manoj Kumar Jaiswal ,&nbsp;Abhayanand Singh Maurya ,&nbsp;Arun Kaushik ,&nbsp;Rahul Pawar ,&nbsp;Rajveer Sharma ,&nbsp;Nitish Kumar","doi":"10.1016/j.palaeo.2025.112911","DOIUrl":"10.1016/j.palaeo.2025.112911","url":null,"abstract":"<div><div>Monsoon rainfall in the northwest (NW) Himalaya is influenced by a complex interplay of various forcing factors, controlling diverse agrarian practices. The NW Himalaya receives the bulk of its rainfall from the Indian summer monsoon (ISM) with a small amount of precipitation originating from the westerlies during winter. To understand ISM variability in the last millennium, a 1 m long core was raised from Tikkar Taal Lake in the Panchkula district of Haryana, India and examined for multiple proxies (grain size, major and trace element ratios, stable isotope (δ¹³C_org) and Total Organic Carbon (TOC Wt). The statistical analyses, including End Member Modelling (EMM), correlation matrix, spectral analysis, Wavelet Transform Coherence (WTC) Analysis along with Continuous Wavelet Transform (CWT) analysis reveal significant changes in the Little Ice Age (LIA) and Current Warm Period (CWP). Accelerator Mass Spectrometry (AMS) ¹⁴C dates of three bulk sediment and two gastropod samples give an age range of ∼700 years. Pacific Decadal Oscillation (PDO) along with El Niño -Southern Oscillation (ENSO) and North Atlantic Oscillation (NAO) are the forcing factors for changes in precipitation. Two climatically significant intervals are identified, LIA (∼1296–1850 CE) with a moderately wet and humid phase from ∼1296 to 1500 CE, followed by a moderately dry phase from ∼1500 to 1850 CE overlapped by the Maunder Minimum (∼1645–1710 CE). The CWP is characterized by humid conditions (1850 CE onwards) coinciding with human-induced changes in the environment. The spectral analysis shows NAO and PDO like cyclicities of 15, 16, 18,19,22 and 28 yrs.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"668 ","pages":"Article 112911"},"PeriodicalIF":2.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strontium-isotope stratigraphy: methodology, standard values (SRM987, EN-1, E&A), a new Neogene curve of 87Sr/86Sr against time, its implications for astrochronology ([I]ODP Sites 1146, 1264, U1337, and U1338), and its application to ODP Site 758 (Indian summer monsoon) and IODP Site 1120 (a new age-model)","authors":"J.M. McArthur ,&nbsp;I.L. Millar ,&nbsp;A.J. Drury ,&nbsp;D. Wagner","doi":"10.1016/j.palaeo.2025.112907","DOIUrl":"10.1016/j.palaeo.2025.112907","url":null,"abstract":"<div><div>For the standards SRM(NIST) 987, EN-1, and E&amp;A, we present compilations of ⁸⁷Sr/⁸⁶Sr from the literature, and 125 new measurements of ⁸⁷Sr/⁸⁶Sr, to arrive at recommend values of 0.710 248, 0.709 172, and 0.708 021 respectively, for normalising ⁸⁷Sr/⁸⁶Sr data for use in Sr-isotope stratigraphy. Using these standards, interlaboratory comparison of ⁸⁷Sr/⁸⁶Sr data is, nevertheless, impaired by residual bias of up to 0.000 072 that is not removed by normalisation of ⁸⁷Sr/⁸⁶Sr data to accepted values for standards. We also provide a new reference curve of ⁸⁷Sr/⁸⁶Sr against time for the period 11 to 20 Ma that is based on high-precision (± 0.000 003, 2 s.e.) analysis of ^{8 7}Sr/⁸⁶Sr in microfossil calcite from the ODP Sites 1146 and 1264, and IODP Sites U1337 and U1338. Ages for Site U1338 are calibrated by bio-magnetostratigraphy, whilst the others are calibrated by astrochronology, within which anomalies of up to 1.0 myrs are noted. With literature data, we extend the curve to 0 and 32 Ma. We show that the previous ⁸⁷Sr/⁸⁶Sr reference curve for the interval 0 – 7 Ma, that of Farrell et al. (1995) for Site 758 in the southern Bay of Bengal, is compromised by riverine influences from the Ganges/Brahmaputra rivers: differences between that curve and our new curve are interpreted to be a proxy for the intensity of the Indian summer monsoon. Finally, for Site 1120, a new age-model is presented, based on ⁸⁷Sr/⁸⁶Sr, in order to test the biostratigraphic age-model for the site, which is found to be good. This work shows that integrated approaches to improving the chronological framework of Cenozoic successions should include Sr-isotope stratigraphy.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"669 ","pages":"Article 112907"},"PeriodicalIF":2.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}