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Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska

2001; Geological Society of America; Volume: 29; Issue: 9 Linguagem: Inglês

10.1130/0091-7613(2001)029 2.0.co;2

1943-2682

Michelle L. Coombs, James E. Gardner,

Geochemistry and Geologic Mapping

Research Article| September 01, 2001 Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska Michelle L. Coombs; Michelle L. Coombs 1Alaska Volcano Observatory, Geophysical Institute and Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775, USA Search for other works by this author on: GSW Google Scholar James E. Gardner James E. Gardner 1Alaska Volcano Observatory, Geophysical Institute and Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775, USA Search for other works by this author on: GSW Google Scholar Geology (2001) 29 (9): 775–778. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history received: 07 Feb 2001 rev-recd: 23 Apr 2001 accepted: 10 May 2001 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Michelle L. Coombs, James E. Gardner; Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska. Geology 2001;; 29 (9): 775–778. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Recent studies have proposed contrasting models for the plumbing system that fed the 1912 eruption of Novarupta, Alaska. Here, we investigate the conditions under which the rhyolitic part of the erupted magma last resided in the crust prior to eruption. Geothermometry suggests that the rhyolite was held at ∼800–850 °C, and analyses of melt inclusions suggest that it was fluid saturated and contained ∼4 wt% water. Hydrothermal, water-saturated experiments on rhyolite pumice reveal that at those temperatures the rhyolite was stable between 40 and 100 MPa, or a depth of 1.8–4.4 km. These results suggest that pre-eruptive storage and crystal growth of the rhyolite were shallow; if the rhyolite ascended from greater depths, it did so slowly enough for unzoned phenocrysts to grow as it passed through the shallow crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.