Résumés
Abstract
The analysis of microbial and palynological remains in Cambrian shales is useful for biostratigraphic and palaeoecological purposes but, in outcrops affected by contact metamorphism, also for discriminating burial and metamorphic temperatures. The microbial composition of the Miaolingian black shales from the Pleasant View Formation (Inlet Group) in the Burin Peninsula consists of monospecific cyanobacterial associations of Bavlinella faveolata, a cosmopolitan taxon that characterized eutrophication episodes in Neoproterozoic to Miaolingian times. The specimens show varying degrees of degradation under thin-section (2D) and Field Emission Gun Scanning Electron Microscopy (FEGSEM, 3D). Raman Spectra of Carbonaceous Materials (RSCM) thermometry applied to both the acritarchs and meshworks of amorphous organic matter has reported average metamorphic temperatures of 300 to 343 ºC, whereas the standardized Crystallinity Index Standard value of 0.35 suggests temperatures slightly below the anchizone-epizone boundary, established at 300 ºC. The most likely fit for the peak metamorphic contact temperature recorded in Miaolingian black-shale samples, collected close to the Upper Devonian St. Lawrence granitic intrusions, is within the 300-350 ºC interval.
Résumé
L’analyse des restes microbiens et palynologiques dans les schistes cambriens est utile à des fins biostratigraphiques et paléoécologiques, mais elle peut également servir à distinguer les températures d’enfouissement et de métamorphisme dans les affleurements affectés par un métamorphisme de contact. La composition microbienne des schistes noirs du Miaolingien provenant de la Formation de Pleasant View (Groupe d’Inlet) dans la péninsule de Burin est formée d’associations cyanobactériennes monospécifiques de Bavlinella faveolata, un taxon cosmopolite qui a caractérisé les épisodes d’eutrophisation au cours du Néoprotérozoïque au Miaolingien. Les spécimens présentent des degrés divers de dégradation sous microscopie pour examen par transmission et sous microscopie électronique à balayage à canon à émission de champ. Les spectres Raman de la thermométrie des matières carbonées appliqués aux microfossiles à paroi organique et aux réseaux de matière organique amorphe ont signalé des températures métamorphiques moyennes de 300 à 343 °C, alors que la valeur normalisée de l’indice de cristallinité de 0,37 ± 0,04 correspond à une position légèrement au-dessous de la limite entre l’anchizone et l’épizone, établie à 300 oC. L’estimation la plus probable de la température maximale de contact métamorphique enregistrée dans les échantillons de schistes noirs du Miaolingien, prélevés à proximité des intrusions granitiques du Dévonien supérieur de St. Lawrence, se situe dans l’intervalle de 300 à 350 °C.
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