The Chromium Isotope System as a Tracer of Ocean and Atmosphere Redox

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Kohen W. Bauer (University of British Columbia, Vancouver) Noah J. Planavsky (Yale University, Connecticut)

The Chromium Isotope System as a Tracer of Ocean and Atmosphere Redox

Kohen W. Bauer (University of British Columbia, Vancouver), Noah J. Planavsky (Yale University, Connecticut), Christopher T. Reinhard (Georgia Institute of Technology) , Devon B. Cole (Georgia Institute of Technology)

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English

Cambridge University Press
25 February 2021

Geochemistry; Oceanography (seas); Meteorology & climatology; Palaeontology

Series: Elements in Geochemical Tracers in Earth System Science

The stable chromium (Cr) isotope system has emerged over the past decade as a new tool to track changes in the amount of oxygen in earth's ocean-atmosphere system. Much of the initial foundation for using Cr isotopes (δ53Cr) as a paleoredox proxy has required recent revision. However, the basic idea behind using Cr isotopes as redox tracers is straightforward—the largest isotope fractionations are redox-dependent and occur during partial reduction of Cr(VI). As such, Cr isotopic signatures can provide novel insights into Cr redox cycling in both marine and terrestrial settings. Critically, the Cr isotope system—unlike many other trace metal proxies—can respond to short-term redox perturbations (e.g., on timescales characteristic of Pleistocene glacial-interglacial cycles). The Cr isotope system can also be used to probe the earth's long-term atmospheric oxygenation, pointing towards low but likely dynamic oxygen levels for the majority of Earth's history.

By: Kohen W. Bauer (University of British Columbia Vancouver), Noah J. Planavsky (Yale University, Connecticut), Christopher T. Reinhard (Georgia Institute of Technology), Devon B. Cole (Georgia Institute of Technology)
Imprint: Cambridge University Press
Country of Publication: United Kingdom
Dimensions: Height: 150mm, Width: 230mm, Spine: 3mm
Weight: 67g
ISBN: 9781108792578
ISBN 10: 110879257X
Series: Elements in Geochemical Tracers in Earth System Science
Pages: 75
Publication Date: 25 February 2021
Audience: Professional and scholarly , Undergraduate
Format: Paperback
Publisher's Status: Active

1. Introduction; 2. Basics of Cr speciation and isotope fractionations; 3. A global Cr isotope mass balance?; 4. Seawater Cr isotope values; 5. The sedimentary Cr isotope record; 6. Summary and future directions.