Petrological constraints on magma storage conditions during ongoing post-caldera volcanism at Ioto volcano, Ogasawara, Japan

Petrological constraints on magma storage conditions during ongoing post-caldera volcanism at Ioto volcano, Ogasawara, Japan | 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 Research Article Petrological constraints on magma storage conditions during ongoing post-caldera volcanism at Ioto volcano, Ogasawara, Japan Takahiro Miwa, Masashi Nagai, Tomofumi Kozono, Setsuya Nakada, and 5 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4543053/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Active volcanism occurs at post-caldera volcanoes, which are often characterized by rapid crustal uplift due to the development of resurgent domes. Post-caldera volcanism has been attributed to the behavior of volcanic fluids in a magma storage region beneath the caldera. However, few studies have provided petrological constraints on magma storage during ongoing post-caldera volcanism. In this paper, we describe the petrological characteristics of the eruptive products from the 2022 eruption at Ioto volcano, Ogasawara, Japan, which provide a unique opportunity to examine magma storage conditions. The 2022 Ioto magma is characterized by a trachytic composition and contains ~7 vol.% phenocrysts (plagioclase, clinopyroxene, olivine, and magnetite). The clinopyroxene–liquid geothermometer and plagioclase–liquid hygrometer yield a temperature of 970 ± 30°C and water content of 1.4 ± 1.1 wt.% for the Ioto magma. The water content corresponds to a pressure of 25 ± 22 MPa, implying magma is stored at a depth of 1.2 ± 1.0 km beneath the volcano. This depth is consistent with the funnel-shaped magma body at 1–2 km depth inferred from geophysical data. As such, we conclude that the 2022 eruption was sourced from magma stored at ~1.2 km depth. Intrusion of magma through a cone sheet may have contributed to the block-like uplift of Motoyama, which is part of the ongoing post-caldera volcanism at Ioto volcano. Full Text Supplementary Files Table1.docx Table2.docx Table3.docx Table4.docx Supplement01GB.xlsx Supplement02IG.xlsx Supplement03PL.xlsx Supplement04CPX.xlsx Supplement05OL.xlsx Supplement06MG.xlsx Cite Share Download PDF Status: Posted 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-4543053","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":321352730,"identity":"c581fd82-63c9-40bb-b3cc-5db18f587fbf","order_by":0,"name":"Takahiro 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