Geochemical trends in whole-seam coal channel samples from the Sydney coalfield (upper carboniferous), Nova Scotia, Canada
DOI :
https://doi.org/10.4138/1629Résumé
From a series of whole-coal channel samples of the Sydney Coalfield of Nova Scotia, data on 30 metals and sulfur were obtained in order to study their stratigraphic variation, abundance, and origin. The data suggest the presence of distribution patterns (trends) that can be described in terms of concentration peaks occurring at the bottom or top of the channel samples. Complex or cyclical trends are observed in coal samples from the thicker 200 cm seams. These trends are genetically linked with deposition of pyrite and the depositional history of the peat swamps to form coal. Regional trends are not found in the data but there is a suggestion that some chalcophile metals are age-dependent and occur in the younger seams in the Point Aconi area. RÉSUMÉ On a prélevé des données sur 30 métaux et le soufre dans une suite d'échantillons de charbon global provenant de chenaux du bassln houiller de Sydney, en Nouvelle-Écosse, afin d'en étudier la variation stratigraphique, l’abondance et l'origine. Leur traitement suggére la présence de patrons de distribution [tendances] sous la forme de pics de concentration qui se trouvent à la base ou au sommet des échantillons de chenal. On observe des tendances complexes ou cycliques dans les échantillons de charbon provenant des couches plus épaisses [200 cm]. L'origine de ces tendances est reliée au dépôt de la pyrite ainsi qu's l'histoire du remplissage des tourbieres d'ou provient le charbon. À défaut d'avoir une tendance régionale, ces données conduisent à suggérer une dépendence vis-à-vis l'âge de certains minéraux chalcophiles qui se trouvent dans les lits plus jeunes de la région de Point Anconi. [Traduit par le journal]Téléchargements
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