Petrology, Geochemistry, and Genesis of the Copper zone at the Brunswick No. 6 Volcanogenic Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick, Canada
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Research Article| July 01, 2006 Petrology, Geochemistry, and Genesis of the Copper zone at the Brunswick No. 6 Volcanogenic Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick, Canada K.L. MacLELLAN; K.L. MacLELLAN 1Department of Geology, University of New Brunswick, 2 Bailey Drive, Fredericton, New Brunswick, E3N 5A3. Search for other works by this author on: GSW Google Scholar D.R. LENTZ; D.R. LENTZ 1Department of Geology, University of New Brunswick, 2 Bailey Drive, Fredericton, New Brunswick, E3N 5A3. Search for other works by this author on: GSW Google Scholar S.H. McCLENAGHAN S.H. McCLENAGHAN 1Department of Geology, University of New Brunswick, 2 Bailey Drive, Fredericton, New Brunswick, E3N 5A3. Search for other works by this author on: GSW Google Scholar Exploration and Mining Geology (2006) 15 (3-4): 53–75. https://doi.org/10.2113/gsemg.15.3-4.53 Article history received: 01 Mar 2001 accepted: 26 Mar 2006 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation K.L. MacLELLAN, D.R. LENTZ, S.H. McCLENAGHAN; Petrology, Geochemistry, and Genesis of the Copper zone at the Brunswick No. 6 Volcanogenic Massive Sulfide Deposit, Bathurst Mining Camp, New Brunswick, Canada. Exploration and Mining Geology 2006;; 15 (3-4): 53–75. doi: https://doi.org/10.2113/gsemg.15.3-4.53 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyExploration and Mining Geology Search Advanced Search Abstract A Cu-rich pyrrhotite-pyrite zone that occurs at the base of the Brunswick No. 6 Pb-Zn massive-sulfide lens is part of a south-plunging synclinal sheath fold. To the north of the unmined open pit, this Cu zone's preliminary ore-reserve calculations indicate >1.7 Mt grading 0.9% Cu. Pyrite, pyrrhotite, chalcopyrite, sphalerite, and magnetite are the major opaque minerals, and are accompanied by trace amounts of arsenopyrite-cobaltite, bismuthinite, and cassiterite. Most of the chalcopyrite and pyrite is fine grained, but cataclastically deformed pyritic porphyroblasts, porphyroclasts, and boudins of pyritic massive sulfide are hosted by a matrix of remobilized and recrystallized chalcopyrite-bearing pyrrhotite. Eleven 1.6 m-long intervals were sampled near the mid point of massive sulfide intersections from 10 diamond-drill holes (DDH) intersecting the Cu zone. Re-assaying of these samples yielded averages of 0.96% Cu, 0.10% Zn, 0.06% Pb, 12.2 g/t Ag, 0.04% Bi, 0.08 g/t Au, 0.03% As, 0.01% Sb, and Sn values below the detection limit of 50 ppm. Six 1.6 m core intervals in the exhalative Pb-Zn zone (DDH B-259) were also re-assayed, yielding averages of 0.79% Cu, 1.08% Pb, 3.46% Zn, 0.051% Bi, 58.6 g/t Ag, 0.50 g/t Au, 0.311% As, 0.063% Sb, and Sn values of 80 to 670 ppm. The concentrations of Zn, Cd, Pb, Ag, As, Sb, Mo, Ca, and Sr decrease with increased depth into the sheath-shaped basal Cu zone, which has notably higher Ba, Se, and Te contents. In contrast to the chemical differences, the bulk δ34S values for both zones range from 13‰ to 15‰, which are similar to the values for other deposits within the Tetagouche Group. The contrasting distribution of major and trace elements suggests that the zoning is a syngenetic feature, modified by D1 deformation and related metamorphism. Geobarometry of sphalerite shielded within pyrite indicates peak D1 pressures of >7 kb, similar to those at the nearby Brunswick No. 12 deposit. Late re-equilibration in the presence of pyrrhotite resulted in very high mole % FeS contents in sphalerite.The high Cu and low Pb-Zn contents within the Cu zone compared with those in the overlying, contiguous Zn-Pb-Ag exhalative massive sulfide zone, is a pattern commonly observed in proximal VMS deposits. The metals' distribution is interpreted to reflect a higher temperature zone-refining within the massive sulfides, which are located above a stockwork feeder zone that has been transposed to the north. The interpreted zone refining is consistent with: (1) the relatively high pyrrhotite-to-pyrite abundance and the higher abundance of chalcopyrite; (2) lower sphalerite, galena, tetrahedrite-tennantite, arsenopyrite, and cassiterite abundances in the Cu zone; and (3) the low S/Se ratio typical of other Cu-rich zones. This interpretation is consistent with the similarity of δ34S values for the Cu and Pb-Zn zones. You do not currently have access to this article.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,005 | 0,009 |
| Études des sciences et des technologies | 0,003 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,007 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».