Geochemical Implications of Biotite and Amphibole in the Thermo- Barometric Conditions and the Petrogenic Relationships of Plutonic Rocks in the Bougouni Area, Southern Mali

Geochemical Implications of Biotite and Amphibole in the Thermo- Barometric Conditions and the Petrogenic Relationships of Plutonic Rocks in the Bougouni Area, Southern Mali | 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 Geochemical Implications of Biotite and Amphibole in the Thermo- Barometric Conditions and the Petrogenic Relationships of Plutonic Rocks in the Bougouni Area, Southern Mali Séko Sanogo, Ousmane Wane, Salia Coulibaly, Cyril Durand, Michel Dubois, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9251446/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 8 You are reading this latest preprint version Abstract The Bougouni Pegmatite Province is known for its lithium-bearing pegmatites, which are associated with Paleoproterozoic rock formations. These Paleoproterozoic rocks are composed plutonic and metavolcanosedimentary formations. Plutonic intrusions are widely distributed across the Léo-Man Shield, and provide comprehensive data for understanding the Birimian crust evolution. This study presents new petrographic and geochemical on minerals data from plutonic rocks of Bougouni area within southern Mali. Geothermobarometric calculations were applied to the analyzed mafic minerals. The Bougouni plutonic rocks exhibit a wide of petrographic compositions, range gab-bros to two-mica granites. They contain of calcic amphibole, magnesium-rich biotite, plagioclase (from albite to labrador), alkali feldspar (microcline and perthite), quartz, primary muscovite, and accessory minerals, including (e.g., titanite, magnetite, epi-dote, apatite, zircon...) in varying proportions. The chemical compositions of amphiboles, biotites and feldspars are controlled by the substitution relationships within these minerals. Plutonic rocks are subalkaline (calc-alkaline) and range from metaluminous to slightly peraluminous. They are crystallized under conditions of high fO₂ (ΔNNO = − 1.2 to 2.3), with pressures and temperatures between 1.7 and 7 kbar, and 780 to 977°C, respectively. These rocks have relatively high-water contents (H₂O = 2.9–8% by weight). They are thought as type I with a low S tendency, and seem have formed during the subduction setting near-collisional. Earth and environmental sciences/Planetary science Earth and environmental sciences/Solid earth sciences mineral chemistry crystallization magma source thermometry barometry fugacity geodynamic setting WAC Full Text Additional Declarations No competing interests reported. Supplementary Files Appendixes.docx Cite Share Download PDF Status: Under Review Version 1 posted Reviews received at journal 14 May, 2026 Reviewers agreed at journal 26 Apr, 2026 Reviewers agreed at journal 26 Apr, 2026 Reviewers invited by journal 20 Apr, 2026 Editor assigned by journal 20 Apr, 2026 Editor invited by journal 20 Apr, 2026 Submission checks completed at journal 15 Apr, 2026 First submitted to journal 15 Apr, 2026 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-9251446","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":630135052,"identity":"2d6881ff-c9f4-4dd5-a1e8-a69a465f2556","order_by":0,"name":"Séko 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These Paleoproterozoic rocks are composed plutonic and metavolcanosedimentary formations. Plutonic intrusions are widely distributed across the L\u0026eacute;o-Man Shield, and provide comprehensive data for understanding the Birimian crust evolution. This study presents new petrographic and geochemical on minerals data from plutonic rocks of Bougouni area within southern Mali. Geothermobarometric calculations were applied to the analyzed mafic minerals. The Bougouni plutonic rocks exhibit a wide of petrographic compositions, range gab-bros to two-mica granites. They contain of calcic amphibole, magnesium-rich biotite, plagioclase (from albite to labrador), alkali feldspar (microcline and perthite), quartz, primary muscovite, and accessory minerals, including (e.g., titanite, magnetite, epi-dote, apatite, zircon...) in varying proportions. The chemical compositions of amphiboles, biotites and feldspars are controlled by the substitution relationships within these minerals. 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