Flux of volatiles and ore-forming metals from the magmatic-hydrothermal system of Satsuma Iwojima volcano

Abstract

Research Article| July 01, 1994 Flux of volatiles and ore-forming metals from the magmatic-hydrothermal system of Satsuma Iwojima volcano Jeffrey W. Hedenquist; Jeffrey W. Hedenquist 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Search for other works by this author on: GSW Google Scholar Masahiro Aoki; Masahiro Aoki 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Search for other works by this author on: GSW Google Scholar Hiroshi Shinohara Hiroshi Shinohara 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Jeffrey W. Hedenquist 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Masahiro Aoki 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Hiroshi Shinohara 1Geological Survey of Japan, 1-1-3 Higashi, Tsukuba 305, Japan Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (7): 585–588. https://doi.org/10.1130/0091-7613(1994)022<0585:FOVAOF>2.3.CO;2 Article history 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 Jeffrey W. Hedenquist, Masahiro Aoki, Hiroshi Shinohara; Flux of volatiles and ore-forming metals from the magmatic-hydrothermal system of Satsuma Iwojima volcano. Geology 1994;; 22 (7): 585–588. doi: https://doi.org/10.1130/0091-7613(1994)022<0585:FOVAOF>2.3.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 The Satsuma Iwojima volcano, southwest Japan, degasses 5 x 106 t/yr H2O, 9 x 10 4 t/yr S, and 6 x 104 t/yr Cl from high-temperature (≤880 °C) fumaroles atop a now-altered rhyolite dome that erupted 1200 yr ago. Acidic hot springs (pH 1.1-1.8) discharge ∼20 x 106 t/yr H2O to the sea; this water is composed of ∼1 part magmatic vapor absorbed by 6 parts meteoric ground water. The Cl and SO4 in solution originate from the vapor, whereas cation components are derived largely by dissolution of the rhyolite. The flux of Pb, Zn, Cu, and Mo in the vapor and acidic springs ranges from 0.1 to 10 t/yr each, whereas the Au flux is 10-5 and 10-3 t/yr, respectively. The low concentrations of NaCl and metals in the vapor are due to the condensation of a hypersaline liquid from the vapor during ascent and depressurization, meaning that the atmospheric-pressure vapor does not reflect the composition of the fluid exsolving from the magma. Neither this low-pressure vapor nor the acidic waters can account for high-sulfidation Cu-Au ore deposits deduced to have formed in this environment; such mineralization requires the subsequent ascent of a metal-rich fluid. 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.