Phosphorus, nitrogen, and the redox evolution of the Paleozoic oceans

Geology ◽  
2005 ◽  
Vol 33 (7) ◽  
pp. 573 ◽  
Author(s):  
Matthew R. Saltzman
Keyword(s):  
Redox Evolution

scholarly journals Biogeochemical Controls on the Redox Evolution of Earth’s Oceans and Atmosphere

Elements ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 191-196 ◽  
Author(s):  
Christopher T. Reinhard ◽  
Noah J. Planavsky
Keyword(s):  
Redox State ◽  
Modeling Tools ◽  
Evolutionary Trajectory ◽  
Geochemical Tracers ◽  
Atmosphere System ◽  
Ocean Atmosphere ◽  
Dramatic Shift ◽  
Redox Evolution

The redox state of Earth’s atmosphere has undergone a dramatic shift over geologic time from reducing to strongly oxidizing, and this shift has been coupled with changes in ocean redox structure and the size and activity of Earth’s biosphere. Delineating this evolutionary trajectory remains a major problem in Earth system science. Significant insights have emerged through the application of redox-sensitive geochemical systems. Existing and emerging biogeochemical modeling tools are pushing the limits of the quantitative constraints on ocean–atmosphere redox that can be extracted from geochemical tracers. This work is honing our understanding of the central role of Earth’s biosphere in shaping the long-term redox evolution of the ocean–atmosphere system.

Heterogeneous redox evolution of the Meso-Neoproterozoic ocean: Insights from eastern China

2021 ◽  
Vol 567 ◽  
pp. 110304
Author(s):  
Yu Zou ◽  
Gregory E. Webb ◽  
Fenghua Zhao ◽  
Dongna Liu ◽  
Hongwei Kuang ◽  
...  
Keyword(s):  
Eastern China ◽  
Redox Evolution

scholarly journals Iron isotopes and the redox evolution of Ediacaran sediments

2021 ◽  
Vol 352 (8) ◽  
pp. 579-588
Author(s):  
Frederic Moynier ◽  
David A. Fike ◽  
Gabrielle Menard ◽  
Woodward W. Fischer ◽  
John P. Grotzinger ◽  
...  
Keyword(s):  
Iron Isotopes ◽  
Redox Evolution

scholarly journals Euxinic conditions recorded in the ca. 1.93 Ga Bravo Lake Formation, Nunavut (Canada): Implications for oceanic redox evolution

2015 ◽  
Vol 417 ◽  
pp. 148-162 ◽  
Author(s):  
C.A. Partin ◽  
A. Bekker ◽  
N.J. Planavsky ◽  
T.W. Lyons
Keyword(s):  
Lake Formation ◽  
Redox Evolution

Marine Redox Evolution and Organic Accumulation In an Intrashelf Basin, Ne Sichuan Basin During the Late Permian

2022 ◽  
Author(s):  
Xiaotong Ge ◽  
Daizhao Chen ◽  
Gongjing Zhang ◽  
Taiyu Huang ◽  
Mu Liu ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Late Permian ◽  
Intrashelf Basin ◽  
Redox Evolution

scholarly journals Redox evolution of a degassing magma rising to the surface

Nature ◽  
2007 ◽  
Vol 445 (7124) ◽  
pp. 194-197 ◽  
Author(s):  
Alain Burgisser ◽  
Bruno Scaillet
Keyword(s):  
Redox Evolution

Guadalupian (Middle Permian) ocean redox evolution in South China and its implications for mass extinction

2019 ◽  
Vol 530 ◽  
pp. 119318 ◽  
Author(s):  
Hengye Wei ◽  
Zhanwen Tang ◽  
Detian Yan ◽  
Jianguo Wang ◽  
Andrew P. Roberts
Keyword(s):  
South China ◽  
Mass Extinction ◽  
Middle Permian ◽  
Redox Evolution

scholarly journals Weathering, alteration and reconstructing Earth's oxygenation

2020 ◽  
Vol 10 (4) ◽  
pp. 20190140 ◽  
Author(s):  
Noah J. Planavsky ◽  
Leslie J. Robbins ◽  
Balz S. Kamber ◽  
Ronny Schoenberg
Keyword(s):  
Quality Control ◽  
Control Measures ◽  
Geochemical Data ◽  
Free Oxygen ◽  
Deep Time ◽  
Oxygen Levels ◽  
Multiple Case ◽  
Redox Evolution ◽  
The Impact ◽  
Spurious Results

Deciphering the role—if any—that free oxygen levels played in controlling the timing and tempo of the radiation of complex life is one of the most fundamental questions in Earth and life sciences. Accurately reconstructing Earth's redox history is an essential part of tackling this question. Over the past few decades, there has been a proliferation of research employing geochemical redox proxies in an effort to tell the story of Earth's oxygenation. However, many of these studies, even those considering the same geochemical proxy systems, have led to conflicting interpretations of the timing and intensity of oxygenation events. There are two potential explanations for conflicting redox reconstructions: (i) that free oxygen levels were incredibly dynamic in both time and space or (ii) that collectively, as a community—including the authors of this article—we have frequently studied rocks affected by secondary weathering and alteration (particularly secondary oxidation) while neglecting to address the impact of this alteration on the generated data. There are now multiple case studies that have documented previously overlooked secondary alteration, resolving some of the conflicting constrains regarding redox evolution. Here, an analysis of a large shale geochemistry database reveals significant differences in cerium (Ce) anomalies, a common palaeoredox proxy, between outcrop and drill core samples. This inconsistency provides support for the idea that geochemical data from altered samples are frequently published in the peer-reviewed literature. As individuals and a geochemical community, most of us have been slow to appreciate how pervasive the problem is but there are examples of other communities that have faced and met the challenges raised by such quality control crises. Further evidence of the high potential for alteration of deep-time geochemical samples, and recognition of the manner in which this may lead to spurious results and palaeoenvironmental interpretations, indicate that sample archiving, in publicly accessible collections needs to become a prerequisite for publication of new palaeoredox data. Finally, the geochemical community need to think about ways to implement additional quality control measures to increase the fidelity of palaeoredox proxy work.

Mantle Redox Evolution and the Oxidation State of the Archean Atmosphere

1993 ◽  
Vol 101 (2) ◽  
pp. 245-257 ◽  
Author(s):  
James F. Kasting ◽  
David H. Eggler ◽  
Stuart P. Raeburn
Keyword(s):  
Oxidation State ◽  
Redox Evolution
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