The North structure: evidence for a second possible impact event at the Bloody Creek site, Nova Scotia, Canada

Auteurs-es

  • Ian Spooner Acadia University
  • Peir Pufahl Acadia University
  • Trevor Brisco University of Toronto
  • Jared Morrow San Diego State University
  • Mariella Nalepa Memorial University of Newfoundland
  • Peter Williams Acadia University
  • George Stevens Acadia University

DOI :

https://doi.org/10.4138/atlgeol.2015.002

Mots-clés :

Bloody Creek structure, Impact, North structure, Multiple impact, Low angled, Crater, Nova Scotia, Canada

Résumé

The North structure is a discontinuous, partially flooded elliptical basin 250 m in diameter and defined by arcuate scarps. It is located in Annapolis County, Nova Scotia, approximately 1 km north of the Bloody Creek structure, a possible 400 m-diameter elliptical impact crater. Geophysical surveys indicate that raised scarps border a broadly elliptical basin with depth/diameter ratios similar to those at the Bloody Creek structure. Percussion coring and probing indicated that the basin is in-filled with 3.5 m of lacustrine sediment and peat overlying post-glacial alluvial sediment and diamicton. Samples collected proximal to the rim of the structure contain kink-bands in feldspar and biotite and possible planar microstructures in quartz and feldspar. The elliptical nature and similar, anomalous morphometries of the North and Bloody Creek structures indicate that two, low-angled, genetically linked impacts may have taken place at the site. Both structures are interpreted to be post-Pliocene (<2.6 Ma), based on the unlikelihood of their preservation during Cretaceous-Paleogene regional peneplanation.

Biographie de l'auteur-e

Ian Spooner, Acadia University

Earth and Environmental Science

Téléchargements

Publié-e

2015-01-31

Comment citer

Spooner, I., Pufahl, P., Brisco, T., Morrow, J., Nalepa, M., Williams, P., & Stevens, G. (2015). The North structure: evidence for a second possible impact event at the Bloody Creek site, Nova Scotia, Canada. Atlantic Geoscience, 51, 044–050. https://doi.org/10.4138/atlgeol.2015.002

Numéro

Vol. 51 (2015)

Rubrique

Articles

Licence

As of January 1, 2025, Atlantic Geoscience is adopting Creative Commons Attribution 4.0 International (CC BY 4.0)  This license requires that reusers give credit to the creator. It allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, even for commercial purposes.

Copyright to material published in Atlantic Geoscience is normally retained by the author.  Alternate arrangements can be made on request for government employees.

Permission to use a single graphic for which the author owns copyright is considered “fair dealing” under the Canadian Copyright Act and “fair use” by the journal, and no other permission need be granted, subject to the image being appropriately cited in all reproductions. The same fair dealing/fair use policy applies to sections of text up to 100 words in length.