Note sur la découverte d’ambre du Carbonifère associé à la fougère à graines Linopteris obliqua, terrain houiller de Sydney, Nouvelle-Écosse, Canada

Auteurs-es

  • Maria Mastalerz Indiana Geological and Water Survey, Université de l’Indiana, Bloomington, Indiana 47405 ÉTATS-UNIS
  • Erwin L. Zodrow 503, chemin Coxheath, Sydney (Nouvelle-Écosse) B1R 1S1 CANADA

DOI :

https://doi.org/10.4138/atlgeo.2022.006

Résumé

Nous rapportons une découverte d’ambre dans les roches sédimentaires carbonifères du terrain houiller de Sydney, en Nouvelle-Écosse, Canada.  L’ambre se manifeste sous forme de gouttelettes ainsi que de figures linéaires, et il a une teinte variant du brun pâle au mauve foncé. L’ambre a été découvert in situ dans de la siltite au-dessus du filon de charbon du Pennsylvanien moyen Hub, où il est associé à des pinnules abondamment falsifiées de la fougère à graines Linopteris obliqua. Les spécimens d’ambre ont été analysés par spectrométrie infrarouge et leurs caractéristiques spectrochimiques ont été comparées à celles d’autres ambres fossiles. Cette découverte élargit non seulement l’inventaire de l’ambre à une période remontant à environ 300 millions d’années, mais documente également la capacité des fougères à graines carbonifères d’utiliser des mécanismes biosynthétiques pour produire des exsudats résineux.

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Publié-e

2022-06-11

Comment citer

Mastalerz, M., & Zodrow, E. L. . (2022). Note sur la découverte d’ambre du Carbonifère associé à la fougère à graines Linopteris obliqua, terrain houiller de Sydney, Nouvelle-Écosse, Canada. Atlantic Geoscience, 58, 147–153. https://doi.org/10.4138/atlgeo.2022.006

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