PETROLOGICAL AND GEOCHEMICAL COMPARISON OF THE EISLER INTRUSIVE SUITE AND THE LAONIL LAKE INTRUSIVE COMPLEX, GLENNIE DOMAIN, NORTHERN SASKATCHEWAN
Notice bibliographique
Résumé
The Paleoproterozoic Pine Lake greenstone belt of northern Saskatchewan, which is part of the Glennie domain of the Reindeer zone of the Trans-Hudson orogen, contains orogenic gold deposits that are hosted in shear zones. The Seabee Gold Operation exploits these deposits and includes the historical Seabee mine and the active Santoy mines. The Pine Lake greenstone belt is divided into the ca. 1.88 Ga Assemblage A, comprising various metamorphosed mafic-intermediate volcanic and volcaniclastic rocks as well as minor siliciclastic rocks, the younger Assemblage B, comprising a polymictic conglomerate at its base overlain by metamorphosed volcaniclastic and sedimentary rocks, and the Porky Lake siliciclastic rocks. Of particular relevance to this study, a variety of intrusive intermediate to mafic igneous rocks ranging in age from ca. 1.89 Ga to 1.83 Ga occur within the belt; several of which are associated with gold mineralization, including the Laonil Lake intrusive complex at Seabee and the Eisler intrusive suite at the prospective Fisher property. These two plutonic suites show similar rock types but are separated by a younger pluton (the ca. 1.86 Ga Eyahpaise pluton) making it unclear if they were originally part of the same intrusive complex or if they were intruded at different times from different magma sources. To test the geological relationships between these intrusive complexes, a study that included zircon U-Pb geochronology, Sm-Nd isotopic analysis, whole rock major and trace element geochemistry, and petrographic analysis was conducted on samples from the Laonil and Eisler intrusive suites. Whole rock major and trace element geochemistry and petrographic data were obtained from additional samples from the Fisher property, including the Footprint and Mac North targets, as well as northeast of George Lake. In this study, rock types from Laonil Lake intrusive complex include gabbro and diorite, from Eisler include gabbro, pegmatitic quartz gabbro, pyroxenite, and hornblende gabbro, a granodiorite from Mac North, and gabbro from the Footprint gabbro. Concordant U-Pb zircon geochronology data yielded a crystallization age of 1878.7 ± 1.3 Ma for the Laonil Lake intrusive complex and 1883.8 ± 0.9 Ma for the Eisler intrusive suite. The new crystallization age for the Laonil Lake intrusive complex is ca. 10 million years younger than a previous U-Pb zircon age determination and refines the emplacement time with a smaller analytical error. The Eisler intrusive suite was not previously dated. Both the Laonil Lake and Eisler ages indicate two temporally separate plutons that both fall within the local Assemblage A rock package. Regionally, they correspond to the ca. 1890-1870 Ma early plutonic intrusions. All samples have positive ƐNd values and plot on, or near, the depleted mantle line indicating that these samples were mantle-derived and lack crustal input. The ƐNd values and the trace element profiles, with negative Nb anomalies, are suggestive of a subduction-related magmatic signature. In addition, an I-type plutonic classification and metaluminous alumina saturation support that these samples (and therefore plutonic bodies) likely formed in a juvenile oceanic arc tectonic setting.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,003 |
| Études des sciences et des technologies | 0,001 | 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) | 0,003 | 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 ».