Paleoenvironmental reconstruction of the Middle Ordovician Majiagou Formation in the northeastern Ordos Basin and its effect on organic matter enrichment

Paleoenvironmental reconstruction of the Middle Ordovician Majiagou Formation in the northeastern Ordos Basin and its effect on organic matter enrichment | 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 Paleoenvironmental reconstruction of the Middle Ordovician Majiagou Formation in the northeastern Ordos Basin and its effect on organic matter enrichment Yi Ran Wang, Xiaofeng Wang, Wenhui Liu, Tao Zhang, Dongdong Zhang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6059613/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 22 Jul, 2025 Read the published version in Scientific Reports → Version 1 posted 5 You are reading this latest preprint version Abstract The change of paleoenvironment is an important factor affecting the change of hydrocarbon-forming organisms and the preservation of organic matter. Combined with global environmental changes, the study of Ordovician paleoenvironment in Ordos Basin is of great significance to guide oil and gas exploration. Taking the marine carbonate rocks of the Middle Ordovician Majiagou Formation in the Daniudi area of the northeastern Ordos Basin as an example, according to the contents of major, trace and rare earth elements, as well as the characteristics of carbon and oxygen isotope composition, the paleoenvironment was reconstructed and its influence on the enrichment of organic matter was analyzed. The results show that carbonate minerals are mainly developed in the Majiagou Formation, detrital minerals are mainly developed in the first member of Majiagou Formation, the Majiagou Formation is in a suboxic-anoxic environment as a whole, and the seawater paleotemperature shows a gradual upward trend, which corresponds to the global seawater temperature change trend from the Darriwilian to Dapingian of the Middle Ordovician. There are differences in the paleoenvironment of the Majiagou Formation in the northeastern part of the basin in different periods, which is an important factor affecting the enrichment of organic matter. The paleoenvironment during the deposition of the first member of the Majiagou Formation is more conducive to the enrichment of organic matter and is an effective source rock development interval. Earth and environmental sciences/Solid earth sciences Earth and environmental sciences/Solid earth sciences/Geochemistry Earth and environmental sciences/Solid earth sciences/Geology Earth and environmental sciences/Solid earth sciences/Sedimentology Marine carbonate Paleoenvironmental reconstruction Organic matter enrichment Majiagou Formation Ordos Basin Full Text Additional Declarations No competing interests reported. Supplementary Files Xraytechnologybasedmineralcontentdata.xlsx Cite Share Download PDF Status: Published Journal Publication published 22 Jul, 2025 Read the published version in Scientific Reports → Version 1 posted Reviewers invited by journal 09 Mar, 2025 Editor assigned by journal 09 Mar, 2025 Editor invited by journal 09 Mar, 2025 Submission checks completed at journal 07 Mar, 2025 First submitted to journal 18 Feb, 2025 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. We do this by developing innovative software and high quality services for the global research community. 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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-6059613","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":426273140,"identity":"a5cd8c1b-a135-4cad-b0d4-02be65ac6744","order_by":0,"name":"Yi Ran Wang","email":"","orcid":"","institution":"Northwest University","correspondingAuthor":false,"prefix":"","firstName":"Yi","middleName":"Ran","lastName":"Wang","suffix":""},{"id":426273141,"identity":"9710d603-193f-4b77-893d-8cd7060b34e8","order_by":1,"name":"Xiaofeng 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Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Marine carbonate, Paleoenvironmental reconstruction, Organic matter enrichment, Majiagou Formation, Ordos Basin","lastPublishedDoi":"10.21203/rs.3.rs-6059613/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6059613/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"The change of paleoenvironment is an important factor affecting the change of hydrocarbon-forming organisms and the preservation of organic matter. Combined with global environmental changes, the study of Ordovician paleoenvironment in Ordos Basin is of great significance to guide oil and gas exploration. Taking the marine carbonate rocks of the Middle Ordovician Majiagou Formation in the Daniudi area of the northeastern Ordos Basin as an example, according to the contents of major, trace and rare earth elements, as well as the characteristics of carbon and oxygen isotope composition, the paleoenvironment was reconstructed and its influence on the enrichment of organic matter was analyzed. The results show that carbonate minerals are mainly developed in the Majiagou Formation, detrital minerals are mainly developed in the first member of Majiagou Formation, the Majiagou Formation is in a suboxic-anoxic environment as a whole, and the seawater paleotemperature shows a gradual upward trend, which corresponds to the global seawater temperature change trend from the Darriwilian to Dapingian of the Middle Ordovician. There are differences in the paleoenvironment of the Majiagou Formation in the northeastern part of the basin in different periods, which is an important factor affecting the enrichment of organic matter. 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