Origin of lode-gold deposits of the Juneau gold belt, southeastern Alaska

Abstract

Research Article| May 01, 1988 Origin of lode-gold deposits of the Juneau gold belt, southeastern Alaska Richard J. Goldfarb; Richard J. Goldfarb 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar David L. Leach; David L. Leach 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar William J. Pickthorn; William J. Pickthorn 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Colin J. Paterson Colin J. Paterson 3Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701 Search for other works by this author on: GSW Google Scholar Author and Article Information Richard J. Goldfarb 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225 David L. Leach 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225 William J. Pickthorn 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Colin J. Paterson 3Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (5): 440–443. https://doi.org/10.1130/0091-7613(1988)016<0440:OOLGDO>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 Email Permissions Search Site Citation Richard J. Goldfarb, David L. Leach, William J. Pickthorn, Colin J. Paterson; Origin of lode-gold deposits of the Juneau gold belt, southeastern Alaska. Geology 1988;; 16 (5): 440–443. doi: https://doi.org/10.1130/0091-7613(1988)016<0440:OOLGDO>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 Mesothermal gold-bearing quartz veins along the Juneau gold belt formed in the early Tertiary from H2O-CO2(±N2,H2S,CH4)-rich, low-salinity fluids at temperatures of 200 to 325 °C and pressures in excess of 1 - 1.5 kbar. Isotopically heavy ore-forming fluids, with δ18O values between +8‰ and +12‰ and δD values of -20‰ to -30‰ , indicate a deep-seated fluid source. The data are compatible with a model of ore-fluid generation via metamorphic devolatilization within material subducted below the southern Alaska continental margin. Prograde metamorphic fluids infiltrated up zones of mechanically enhanced permeability associated with the Coast Range megalineament and formed the gold-bearing veins within brittle units at higher, retrograding crustal levels. Deposition of gold was accomplished by several mechanisms, including boiling, fluid-wall rock reactions, and decreases in pressure and temperature of the hydrothermal fluids. 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.