Re-Os Chronostratigraphy of the Lower Jurassic Fernie Formation

• Author / Creator

  Toma, Jonathan

• Biostratigraphy brackets the deposition of the Gordondale and Poker Chip Member of Lower Jurassic Fernie Formation between Late Hettangian and Early Toarcian stages. Through employing Re-Os chronostratigraphy we have expanded upon these previous age estimates by providing high-precision radiometric age constraints for subsurface upper and lower Gordondale Member contacts, and intermediate sections of the Gordondale Member of Northwestern Alberta, Canada of the Western Canadian Sedimentary Basin (WCSB). Re-Os data coupled with biostratigraphy and chemostratigraphy (Os, Sr) resolves the lower Gordondale Member contact to Late Sinemurian-Early Pliensbachian stages (191.14 ± 0.94 Ma and 192.0 ± 1.4 Ma), subunit 1B of the lower Radioactive Unit of the Gordondale Member to the Late Pliensbachian-Early Toarcian stage (183.9 ± 1.3 Ma), and the Gordondale-Poker Chip contact to an Early Toarcian stage (179.83 ± 0.60). In addition, characterization of the kerogen carbon isotopic composition of the Gordondale and Poker Chip Member has revealed correlations between 187Re/188Os and δ13Ckerogen isotope fraction that implicate organic-matter type as a probable source for 187Re/188Os isotope fractionation. Lastly, experimental investigations of USGS material SBC-1 reveals cold and hot (subcritical) water to be an effective non-destructive extraction technique for the removal of Re and Os from Organic Rich Shales/Sedimentary rock (ORS), which has immediate implications for how fluid interacts with, and disturbs, the Re-Os systematics of ORS in geologic settings.

• Subjects / Keywords

  • Early Jurassic
  • Re-Os
  • Gordondale Member

• Graduation date

  Spring 2019

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-093d-3h78

• License

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