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• W2051546985 abstract "Research Article| May 01, 1947 EPITHERMAL MINERALIZATION AT THE LAST CHANCE AND HORNSILVER MINES, LAVA CREEK DISTRICT, BUTTE COUNTY, IDAHO ALFRED L ANDERSON ALFRED L ANDERSON CORNELL UNIVERSITY, ITHACA, NEW YORK. Search for other works by this author on: GSW Google Scholar Author and Article Information ALFRED L ANDERSON CORNELL UNIVERSITY, ITHACA, NEW YORK. Publisher: Geological Society of America Received: 17 Jun 1946 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1947, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1947) 58 (5): 451–482. https://doi.org/10.1130/0016-7606(1947)58[451:EMATLC]2.0.CO;2 Article history Received: 17 Jun 1946 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ALFRED L ANDERSON; EPITHERMAL MINERALIZATION AT THE LAST CHANCE AND HORNSILVER MINES, LAVA CREEK DISTRICT, BUTTE COUNTY, IDAHO. GSA Bulletin 1947;; 58 (5): 451–482. doi: https://doi.org/10.1130/0016-7606(1947)58[451:EMATLC]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 SocietyGSA Bulletin Search Advanced Search Abstract The epithermal deposits in the Lava Creek district are confined to a zone of structural weakness in Tertiary volcanics which facilitated intrusion of Miocene magma and circulation of ore-bearing solutions. After widespread sericitization, chalcedonization, pyritization, and local alunitization had initiated the first of two main stages of mineralization, pyrite, marcasite, sphalerite, wurtzite, galena, and chalcedony were deposited from solutions whose flow was controlled by minor structural adjustments at the source and along the channelways. Following a more marked structural reopening a second assemblage consisting of minor and variable amounts of quartz, barite, pyrite, stannite, tetrahedrite, famatinite, enargite, klaprothite, chalcopyrite, aikinite, and dickite were added. Lack of equal permeability of fracture zones during mineralization resulted in considerable variation in substance of individual lodes. Those of present commercial interest contain a notable concentration of lead and zinc sulfides.Characteristics of the mineralization indicate that the early solutions were alkalic and moderately hot, but with the formation of alunite they became and remained acidic and mostly below 135° C. Intimate associations of pyrite-marcasite and sphalerite-wurtzite afford evidence of a delicate balance between temperature and acidity changes with some fluctuations of one or the other and a gradual rise in temperature at the close of the stage. Colloform structures in the iron and zinc sulfides suggest colloidal phenomena. Solutions remained acidic during the second stage of deposition but had a higher temperature than during the earlier stage. 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." @default.
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• W2051546985 title "EPITHERMAL MINERALIZATION AT THE LAST CHANCE AND HORNSILVER MINES, LAVA CREEK DISTRICT, BUTTE COUNTY, IDAHO" @default.
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