The Importance of Structural Mapping in Ore Deposits—A New Perspective on the Howard’s Pass Zn-Pb District, Northwest Territories, Canada
Bibliographic record
Abstract
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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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".