Abstract
Research Article| February 01, 1983 Igneous sulfides in the Fish Canyon Tuff and the role of sulfur in calc-alkaline magmas James A. Whitney; James A. Whitney 1Department of Geology, University of Georgia, Athens, Georgia 30602 Search for other works by this author on: GSW Google Scholar John C. Stormer, Jr. John C. Stormer, Jr. 1Department of Geology, University of Georgia, Athens, Georgia 30602 Search for other works by this author on: GSW Google Scholar Geology (1983) 11 (2): 99–102. https://doi.org/10.1130/0091-7613(1983)11<99:ISITFC>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation James A. Whitney, John C. Stormer; Igneous sulfides in the Fish Canyon Tuff and the role of sulfur in calc-alkaline magmas. Geology 1983;; 11 (2): 99–102. doi: https://doi.org/10.1130/0091-7613(1983)11<99:ISITFC>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 Pyrrhotite is a common inclusion in several phenocrystal phases from the Fish Canyon Tuff, a voluminous, homogeneous ash flow erupted from the Central San Juan field. The fugacities of various gaseous species have been calculated using the composition of the pyrrhotite, iron-titanium oxides, and biotite. Sulfur and oxygen fugacities fall very near the sulfur condensation curve, implying that liquid sulfur may have been present in the parent magma. High sulfur fugacities during melt formation can cause high oxygen fugacity in calc-alkaline magmas due to the breakdown of pyrite at high temperatures. During cooling of such magmas, separation of SO2-rich gases causes a reduction in oxygen fugacity. Significant amounts of sulfur are available during degassing and represent a major source of sulfur for related ore deposits. The ultimate source of the high sulfur and oxygen activities is probably pyrite and magnetite deposited during the waning stages of hydrothermal circulation at active oceanic ridges. Other ash flows and calc-alkalic volcanic rocks should be carefully examined for similar sulfide phases. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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