Geology and Mineralogy of the Hercynian Koudiat Aicha Polymetallic (Zn-Pb-Cu) Massive Sulfide Deposit, Central Jebilet, Morocco
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Abstract
Research Article| July 01, 2008 Geology and Mineralogy of the Hercynian Koudiat Aïcha Polymetallic (Zn-Pb-Cu) Massive Sulfide Deposit, Central Jebilet, Morocco F. Lotfi; F. Lotfi 1Faculté des Sciences Semlalia, Marrakech, Morocco. *Present Address: ONHYM, Direction Générale, 5, Av. My-Hassan, BP. 99, Rabat, Morocco; E-mail: lotfi_fouad@yahoo.fr Search for other works by this author on: GSW Google Scholar A Belkabir; A Belkabir † 2Faculté des Sciences et Techniques, Laboratoire Géoressources, BP. 549, Marrakech, Morocco. †Corresponding Author: E-mail: abelkabir@sftg-marrakech.ac.ma Search for other works by this author on: GSW Google Scholar A.C. Brown; A.C. Brown 3Dept. of Civil, Geological and Mining Eng., École Polytechnique de Montréal, 2900 boulevard Édouard-Montpetit, Montréal, Québec, Canada, H3T 1J4. Search for other works by this author on: GSW Google Scholar E. Marcoux; E. Marcoux 4Institut des Sciences de la Terre d'Orléans, Université d'Orléans, Orléans, France. Search for other works by this author on: GSW Google Scholar S Brunet; S Brunet 5Reminex-MANAGEM, Marrakech, Morocco. Search for other works by this author on: GSW Google Scholar L. Maacha L. Maacha 5Reminex-MANAGEM, Marrakech, Morocco. Search for other works by this author on: GSW Google Scholar Exploration and Mining Geology (2008) 17 (3-4): 145–162. https://doi.org/10.2113/gsemg.17.3-4.145 Article history received: 07 May 2007 accepted: 19 Sep 2008 first online: 13 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation F. Lotfi, A Belkabir, A.C. Brown, E. Marcoux, S Brunet, L. Maacha; Geology and Mineralogy of the Hercynian Koudiat Aïcha Polymetallic (Zn-Pb-Cu) Massive Sulfide Deposit, Central Jebilet, Morocco. Exploration and Mining Geology 2008;; 17 (3-4): 145–162. doi: https://doi.org/10.2113/gsemg.17.3-4.145 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyExploration and Mining Geology Search Advanced Search Abstract Koudiat Aïcha is a small Zn-Pb-Cu deposit, enclosed in the Visean Sarhlef volcano-sedimentary series of the Moroccan Hercynian Jebilet massif. Base metal mineralization is located between a basal unit consisting of black argillite with arenite intercalations, and an upper unit composed of black argillite with locally fossiliferous calcareous units towards the top. Paraconcordant gabbro sills are present in both the upper and basal units, and the enclosing strata. Three successive phases of deformation linked to regional deformation overprint the volcano-sedimentary rocks and gabbros, as well as the sulfide mineralization.The mineral deposit includes several lenses of massive to semimassive pyrrhotite, 1 to 20 m thick, with a large halo of disseminated sulfide veinlets and sulfide nodules within a zone of intense chlorite alteration in the footwall. The ore mineralogy consists of massive to semimassive pyrrhotite with lesser amounts of sphalerite, chalcopyrite, arsenopyrite, galena, pyrite, and stannite.Lead isotope results (206Pb/204Pb averaging 18.27) suggest that the metals of the Koudiat Aïcha deposit are derived from the volcano-sedimentary host rocks. Sulfur isotopes also indicate a volcano-sedimentary origin, with bacterial reduction of sulfate (δ34SCDT = −7.5‰ to −10.5‰). The conditions for sulfide metamorphic equilibration range from 250° to 330°C (sphalerite and chlorite geothermometers). The gabbroic sills could have been a local heat source for hydrothermal circulation. Based on these geological and mineralogical features, a Besshi-type model seems appropriate for the genesis of the Koudiat Aïcha mineralization. You do not currently have access to this article.
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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 | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 it