The Importance of Structural Mapping in Ore Deposits—A New Perspective on the Howard’s Pass Zn-Pb District, Northwest Territories, Canada
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Résumé
Research Article| September 01, 2017 The Importance of Structural Mapping in Ore Deposits—A New Perspective on the Howard’s Pass Zn-Pb District, Northwest Territories, Canada Edith Martel Edith Martel † Northwest Territories Geological Survey, Government of the Northwest Territories, Department of Industry, Tourism, and Investment, P.O. Box 1320, 4601-B 52nd Avenue, Yellowknife, Northwest Territories, Canada X1A 2L9 †E-mail: edith_martel@gov.nt.ca Search for other works by this author on: GSW Google Scholar Author and Article Information Edith Martel † Northwest Territories Geological Survey, Government of the Northwest Territories, Department of Industry, Tourism, and Investment, P.O. Box 1320, 4601-B 52nd Avenue, Yellowknife, Northwest Territories, Canada X1A 2L9 †E-mail: edith_martel@gov.nt.ca Publisher: Society of Economic Geologists Accepted: 29 May 2017 First Online: 25 Aug 2017 Online Issn: 1554-0774 Print Issn: 0361-0128 © 2017 Society of Economic Geologists.Society of Economic Geologists Economic Geology (2017) 112 (6): 1285–1304. https://doi.org/10.5382/econgeo.2017.4510 Article history Accepted: 29 May 2017 First Online: 25 Aug 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Edith Martel; The Importance of Structural Mapping in Ore Deposits—A New Perspective on the Howard’s Pass Zn-Pb District, Northwest Territories, Canada. Economic Geology 2017;; 112 (6): 1285–1304. doi: https://doi.org/10.5382/econgeo.2017.4510 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 SocietyEconomic Geology Search Advanced Search Abstract The Howard’s Pass district of the Selwyn basin in eastern Yukon and western Northwest Territories, Canada, includes a total of 15 sediment-hosted Zn-Pb deposits and is one of the largest undeveloped Zn-Pb districts in the world.Understanding the structure is crucial for future exploration efforts and new discoveries. The current genetic model holds that syngenetic mineralization, exhaled during the Silurian, was deformed while sediments were still water saturated, and although deformed again into an open syncline during the Mesozoic Cordilleran orogen, the distribution of the ore was not significantly affected. Based on recent structural mapping of the entire district, it is proposed here that the map pattern is primarily controlled by thrusting, not simply by folding, and forms a duplex structure. Imbricated thrusts root into a flat-lying detachment surface, termed the Howard’s Pass décollement, which forms the floor thrust of the duplex and displays significant ductile strain. Above this floor thrust, a series of imbricated thrust faults disrupt both mineralization and stratigraphic succession. Sulfide minerals (galena, sphalerite, and pyrite) are concentrated and remobilized along a pressure solution cleavage that is well developed in zones of high strain. The duplex is capped by a flat-lying upper detachment (roof thrust) above which less shortening has been accommodated. It is suggested here that the duplex and associated fabrics (pressure solution cleavage, transposition, folds, and faults) formed 250 to 300 m.y. after deposition of sediments, during Jurassic-Cretaceous layer-parallel shortening of the Cordilleran orogen, which significantly affected the distribution of the mineralization. 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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|---|---|---|
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| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
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