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In one form or another, iron speciation has had a long history as a paleoredox proxy. The technique has been refined considerably over the years, and the most recent scheme is unique in its potential to distinguish three major oceanic redox states - oxygenated, ferruginous and euxinic. This Element covers the theory behind the proxy, methods involved in applying the technique, and potential complications in interpreting Fe speciation data. A series of case studies are also provided, which highlight how more advanced consideration of the data, often in concert with other techniques, can provide unprecedented insight into the redox state of ancient oceans.
The Iron Speciation Paleoredox Proxy
Language: en
Pages:
Authors: Simon W. Poulton
Categories: Science
Type: BOOK - Published: 2021-02-28 - Publisher: Cambridge University Press

In one form or another, iron speciation has had a long history as a paleoredox proxy. The technique has been refined considerably over the years, and the most recent scheme is unique in its potential to distinguish three major oceanic redox states - oxygenated, ferruginous and euxinic. This Element covers
Molybdenum as a Paleoredox Proxy
Language: en
Pages:
Authors: Stephan R. Hlohowskyj, Anthony Chappaz, Alexander J. Dickson
Categories: Science
Type: BOOK - Published: 2021-09-09 - Publisher: Cambridge University Press

Molybdenum (Mo) is a widely used trace metal for investigating redox conditions. However, unanswered questions remain that concentration and bulk isotopic analysis cannot specially answer. Improvements can be made by combining new geochemical techniques to traditional methods of Mo analysis. In this Element, we propose a refinement of Mo geochemistry
The Uranium Isotope Paleoredox Proxy
Language: en
Pages:
Authors: Kimberly V. Lau, Stephen J. Romaniello, Feifei Zhang
Categories: Science
Type: BOOK - Published: 2019-08-29 - Publisher: Cambridge University Press

Uranium isotopes (238U/235U) have emerged as a proxy to reconstruct the redox conditions of the Earth's oceans and atmosphere based upon the large isotopic fractionation between reduced U(IV) and oxidized U(VI). Variations in 238U/235U, particularly when recorded in carbonate sediments, can track global trends in marine oxygenation and de-oxygenation. It
Emerging Patterns in Proterozoic Lipid Biomarker Records
Language: en
Pages:
Authors: Gordon D. Love, J. Alex Zumberge
Categories: Science
Type: BOOK - Published: 2021-03-31 - Publisher: Cambridge University Press

Diverse and abundant lipid biomarker assemblages have been reported from a variety of Proterozoic marine environments from the careful analysis of well-preserved rocks and oils. These molecular biosignatures have provided unique insights into the communities and the environmental conditions which characterized the Proterozoic marine biosphere. We summarize some of the
Barium Isotopes
Language: en
Pages:
Authors: Tristan J. Horner, Peter W. Crockford
Categories: Science
Type: BOOK - Published: 2021-04-22 - Publisher: Cambridge University Press

In the modern marine environment, barium isotope (δ138Ba) variations are primarily driven by barite cycling—barite incorporates 'light' Ba isotopes from solution, rendering the residual Ba reservoir enriched in 'heavy' Ba isotopes by a complementary amount. Since the processes of barite precipitation and dissolution are vertically segregated and spatially heterogeneous, barite