Iron Formations as Palaeoenvironmental Archives
Iron Formations as Palaeoenvironmental Archives
Leslie J. Robbins, University of Regina, Saskatchewan, Canada
Noah J. Planavsky, Yale University, Connecticut
Andrey Bekker, University of California, Riverside
Kurt O. Konhauser, University of Alberta
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USDAncient iron formations - iron and silica-rich chemical sedimentary rocks that formed throughout the Precambrian eons - provide a significant part of the evidence for the modern scientific understanding of palaeoenvironmental conditions in Archaean (4.0–2.5 billion years ago) and Proterozoic (2.5–0.539 billion years ago) times. Despite controversies regarding their formation mechanisms, iron formations are a testament to the influence of the Precambrian biosphere on early ocean chemistry. As many iron formations are pure chemical sediments that reflect the composition of the waters from which they precipitated, they can also serve as nuanced geochemical archives for the study of ancient marine temperatures, redox states, and elemental cycling, if proper care is taken to understand their sedimentological context.
Product details
February 2022Adobe eBook Reader
9781009002462
0 pages
This ISBN is for an eBook version which is distributed on our behalf by a third party.
Table of Contents
- 1. Introduction
- 2. Iron Formations as Geochemical Proxies
- 3. Palaeotemperature
- 4. Nutrient Availability
- 5. Palaeoredox
- 6. Bulk vs. In-situ Analysis
- 7. Comparison of IF, Shale, and Carbonate Mo Records: A Case Study
- 8. Outlook.
