Formation of low-δ18O rhyolites after caldera collapse at Yellowstone, Wyoming, USA

Research Article| August 01, 2000 Formation of low-δ18O rhyolites after caldera collapse at Yellowstone, Wyoming, USA Ilya N. Bindeman; Ilya N. Bindeman 1Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar John W. Valley John W. Valley 1Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (8): 719–722. https://doi.org/10.1130/0091-7613(2000)28<719:FOLRAC>2.0.CO;2 Article history received: 13 Dec 1999 rev-recd: 12 May 2000 accepted: 17 May 2000 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 Ilya N. Bindeman, John W. Valley; Formation of low-δ18O rhyolites after caldera collapse at Yellowstone, Wyoming, USA. Geology 2000;; 28 (8): 719–722. doi: https://doi.org/10.1130/0091-7613(2000)28<719:FOLRAC>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 We present a new model for the genesis of low-δ18O rhyolites of the Yellowstone caldera based on analyses of zircons and individual quartz phenocrysts. Low-δ18O rhyolites were erupted soon after the massive caldera-forming Lava Creek Tuff eruption (602 ka, ∼1000 km3) and contain xenocrysts of quartz and zircon inherited from precaldera rhyolites. These zircons are isotopically zoned and out of equilibrium with their host low-δ18O melts and quartz. Diffusion modeling predicts that magmatic disequilibria of oxygen isotopes persists for as much as tens of thousands of years following nearly total remelting of the hydrothermally altered igneous roots of the depressed cauldron, in which the alteration-resistant quartz and zircon initially retained their δ18O values. These results link melting to caldera collapse, rule out rapid or catastrophic magma–meteoric water interaction, and indicate wholesale melting rather than assimilation or partial melting. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.