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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
The Chromium Isotope System as a Tracer of Ocean and Atmosphere Redox

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

Bauer, Kohen W.
Planavsky, Noah J.
Reinhard, Christopher T.

Paperback

Series: Elements in Geochemical Tracers in Earth System Science

General Science

ISBN10: 110879257X
ISBN13: 9781108792578
Publisher: Cambridge University Press
Published: Feb 25 2021
Pages: 34
Weight: 0.13
Height: 0.07 Width: 6.00 Depth: 9.00
Language: English
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.

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