Astronomical calibration of the middle Cambrian in Baltica: Global carbon cycle synchronization and climate dynamics

Astronomical calibration of the middle Cambrian in Baltica: Global carbon cycle synchronization and climate dynamics | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Astronomical calibration of the middle Cambrian in Baltica: Global carbon cycle synchronization and climate dynamics Valentin Jamart, Damien Pas, Linda Hinnov, Jorge Spangenberg, and 6 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7509865/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 13 Mar, 2026 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Abstract The Alum Shale Formation of Baltica preserves one of the most continuous and fossil-rich records of the Cambrian, making it a key sedimentary archive for refining global chronostratigraphy, reconstructing carbon cycle perturbations, and assessing astronomical forcing on high-latitude systems during an early Palaeozoic greenhouse world. A high-resolution cyclostratigraphic and multiproxy study of the middle Cambrian succession from the Albjära-1 drill core (southern Sweden) establishes a 173 kyr obliquity-tuned astronomical time scale (ATS), anchored by a high-precision U–Pb age. Integration of this time scale with new carbon isotope data and refined biostratigraphy positioned the Albjära-1 core as a global reference record. This framework provides the first numerically constrained ages and durations for the Drumian Carbon Isotope Excursion (DICE), enabling worldwide synchronization of biostratigraphy and carbon cycle events. Coupled elemental geochemistry and time calibration reveal that obliquity- and eccentricity-driven climate oscillations modulated sea-level and dust fluxes governing middle Cambrian outer-shelf sedimentation at high-latitudes. These results highlight the sensitivity of early Paleozoic greenhouse Earth systems to astronomical forcing. Earth and environmental sciences/Climate sciences/Palaeoclimate Earth and environmental sciences/Climate sciences/Atmospheric science/Atmospheric dynamics Biological sciences/Evolution/Palaeontology Earth and environmental sciences/Environmental sciences/Environmental chemistry/Geochemistry Physical sciences/Astronomy and planetary science/Astronomy and astrophysics Milankovitch cycles Carbon isotope Sedimentary geochemistry Cambrian Biostratigraphy DICE Full Text Additional Declarations There is NO Competing Interest. Supplementary Files JamartetalNCTableS2GeochCorgBioXRD.xlsx Table S2 - Geochemistry, Corg, Biostratigraphy, XRD JamartetalNCTableS3DICElocalities.xlsx Table S3 - DICE localities JamartetalNCTextS1.docx Text S1 - Main text additional information JamartetalNCTextS2TimesSeriesProtocol.pdf Text S2 - Time series protocol JamartetalNCTableS4ATSFiltersMTM.xlsx Table S4 - ATS, Filters, MTM JamartetalNCTableS1XRFICPMSZscore.xlsx Table S1 - XRF, ICP-MS, Zscore Cite Share Download PDF Status: Published Journal Publication published 13 Mar, 2026 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7509865","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":513089923,"identity":"62886cac-6371-4254-bbaf-65f8e8992573","order_by":0,"name":"Valentin 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