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More than a trace of oxygen: Ichnological constraints on the formation of the giant Zn-Pb-Ag ± Ba deposits, Red Dog district, Alaska

2015; Geological Society of America; Volume: 43; Issue: 10 Linguagem: Inglês

10.1130/g36954.1

1943-2682

Merilie Reynolds, Murray K. Gingras, Sarah A. Gleeson, James U. Stemler,

Hydrocarbon exploration and reservoir analysis

Research Article| October 01, 2015 More than a trace of oxygen: Ichnological constraints on the formation of the giant Zn-Pb-Ag ± Ba deposits, Red Dog district, Alaska Merilie A. Reynolds; Merilie A. Reynolds 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Murray K. Gingras; Murray K. Gingras 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Sarah A. Gleeson; Sarah A. Gleeson 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar James U. Stemler James U. Stemler 2Teck Resources Limited, Suite 3300, Bentall 5, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Merilie A. Reynolds 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Murray K. Gingras 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Sarah A. Gleeson 1Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta T6G 2E3, Canada James U. Stemler 2Teck Resources Limited, Suite 3300, Bentall 5, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada Publisher: Geological Society of America Received: 08 May 2015 Revision Received: 24 Jul 2015 Accepted: 28 Jul 2015 First Online: 09 Mar 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (10): 867–870. https://doi.org/10.1130/G36954.1 Article history Received: 08 May 2015 Revision Received: 24 Jul 2015 Accepted: 28 Jul 2015 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Merilie A. Reynolds, Murray K. Gingras, Sarah A. Gleeson, James U. Stemler; More than a trace of oxygen: Ichnological constraints on the formation of the giant Zn-Pb-Ag ± Ba deposits, Red Dog district, Alaska. Geology 2015;; 43 (10): 867–870. doi: https://doi.org/10.1130/G36954.1 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 Sediment-hosted massive sulfide (SHMS) deposits are an important source of global zinc resources, and the Red Dog Pb-Zn-Ag ± Ba district in Alaska (USA) contains giant deposits of this type. The existing model for ore formation at Red Dog involves early diagenetic replacement of sediment deposited in a restricted basin with stratified suboxic bottom waters. We present new observations of trace fossils Schaubcylindrichnus ichnospecies (isp.) and Chondrites isp. in several Red Dog deposits. The presence of the trace fossils, the size of the largest burrows, and the pervasiveness of the ichnofabric indicate that at least some intervals of the host sediment were deposited in an oxygenated middle to outer shelf environment. The burrow linings and infill are replaced by barite, hydrothermal quartz, and sulfide minerals, and the lack of compaction suggests that mineralization was diagenetically early. To reconcile these data with those from previous regional sedimentological and lithogeochemical studies, we propose a new model whereby the ore-hosting sediment was deposited in a shelfal setting in which redox conditions were affected by a fluctuating oxygen minimum zone. The strong spatial correlation between bioturbation and Red Dog SHMS deposits suggests that the presence of trace fossils may have played an important role in controlling the flow of ore-forming fluids by increasing host sediment permeability. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.