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Permanent link (DOI): https://doi.org/10.7939/R3H117

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

Descriptions

Other title
Subject/Keyword
Iron formations
trace metal mobility
eukaryotic evolution
Precambrian
metallome
paleomarine zinc
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Robbins, Leslie J
Supervisor and department
Konhauser, Kurt (Earth and Atmospheric Sciences)
Examining committee member and department
Gingras, Murray (Earth and Atmospheric Sciences)
Konhauser, Kurt (Earth and Atmospheric Sciences)
Li, Long (Earth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2013-06-06T10:41:24Z
Graduation date
2013-11
Degree
Master of Science
Degree level
Master's
Abstract
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.
Language
English
DOI
doi:10.7939/R3H117
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Robbins LJ, Lalonde SV, Saito MA, Planavsky NJ, Mloszewska AM, Pecoits E, Scott C, Dupont CL, Kappler A, Konhauser KO (2013) Authigenic iron oxide proxies for marine zinc over geological time and implications for eukaryotic metallome evolution. Geobiology, doi: 10.1111/gbi.12036

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