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Zinc in Precambrian iron formations: The record, partitioning, diagenetic effects and implications for eukaryotic metallome evolution

  • Author / Creator
    Robbins, Leslie J
  • Zinc is amongst the most important trace elements for eukaryotes. Previous work has suggested it to have been at biolimiting concentrations for much of the Precambrian, thereby limiting eukaryotic evolution. Yet, the iron formation (IF) record, a critical proxy for paleomarine conditions, has remained unexplored. Here, we examine aspects of the IF record and its geochemistry, including: thermodynamic models for Zn in paleomarine conditions, the abundance of Zn through geological time, and hypothesized partitioning models. Further, experimental constraints such as, derived partitioning isotherms and an assessment of the mobility of Zn (and for comparison Ni) during IF diagenesis are presented. Taken together, these examinations inform our interpretation of the IF record, indicating a static Zn reservoir throughout geological time that was unlikely to have been biolimiting to early eukaryotes. Instead, the most parsimonious explanation for a delay in eukaryotic evolution is tied to biological development, rather than marine geochemistry.

  • Subjects / Keywords
  • Graduation date
    2013-11
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/R3H117
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Master's
  • Department
    • Department of Earth and Atmospheric Sciences
  • Supervisor / co-supervisor and their department(s)
    • Konhauser, Kurt (Earth and Atmospheric Sciences)
  • Examining committee members and their departments
    • Gingras, Murray (Earth and Atmospheric Sciences)
    • Li, Long (Earth and Atmospheric Sciences)
    • Konhauser, Kurt (Earth and Atmospheric Sciences)