Explanipedia

Insights into the acquisition of kinetic iron isotope signatures of pyrite precipitated through the polysulfide pathway Open

Franck Poitrasson, Guillaume Morin, Romain Guilbaud, Camille Baya, Jeremy Rabone · 2025

International audience

HERFD-XAS evidence for an octahedrally coordinated CoSn-polysulfide precursor as a probe for the mechanism of pyrite formation Open

Qianyu Deng, P. Bonville, Julie Aufort, Marc Blanchard, Benoı̂t Baptiste , et al. · 2025

Archaean oxygen oases driven by pulses of enhanced phosphorus recycling in the ocean Open

Fuencisla Cañadas Blasco, Romain Guilbaud, Philip Fralick, Yijun Xiong, Simon W. Poulton , et al. · 2025

Earth’s first rise in atmospheric oxygen between about 2.43 billion and 2.1 billion years ago fundamentally transformed the atmosphere and oceans, setting the foundation for the evolution of complex life. However, geochemical evidence reve…

Mackinawite partial oxidation to green rust produces a large, abiotic uranium isotope fractionation Open

Romain Guilbaud, Morten B. Andersen, Helen M. Freeman, Jeffrey Paulo H. Perez, David Uhlig , et al. · 2025

 Life-Earth coevolution: the role of phosphorus in Archean oxygen accumulation  Open

Fuencisla Cañadas Blasco, Romain Guilbaud, Philip Fralick, Yijun Xiong, Simon W. Poulton , et al. · 2024

Investigating the presence of oxygen on planets within our solar system and beyond is crucial for understanding the potential for life beyond Earth. Oxygen is a key ingredient for life as we know it and serves as a key indicator of habitab…

Sustained increases in atmospheric oxygen and marine productivity in the Neoproterozoic and Palaeozoic eras Open

Richard Stockey, Devon B. Cole, Úna C. Farrell, Heda Agić, Thomas H. Boag , et al. · 2024

Proterozoic evolution of the phosphorus cycle: Was it high or was it low? Open

Romain Guilbaud · 2024

Iron isotope fractionation during sulfide-promoted reductive dissolution of iron (oxyhydr)oxide minerals Open

A. McAnena, Silke Severmann, Romain Guilbaud, Simon W. Poulton · 2024

International audience

Multiple sustained increases in atmospheric oxygen and marine productivity through the Neoproterozoic and Paleozoic Eras Open

Richard Stockey, Devon B. Cole, Úna C. Farrell, Heda Agić, Thomas H. Boag , et al. · 2023

A geologically rapid Neoproterozoic oxygenation event is commonly linked to the appearance of marine animal groups in the fossil record. However, there is still debate about what evidence from the sedimentary geochemical record – if any – …

Phosphorus controls on the formation of vivianite versus green rust under anoxic conditions Open

Yijun Xiong, Romain Guilbaud, Caroline L. Peacock, Michael D. Krom, Simon W. Poulton · 2023

Archean carbonates and oxygen-rich oasis: implications for ancient life on Mars Open

Fuencisla Cañadas Blasco, Romain Guilbaud, Philip Fralick, Alberto González Fairén · 2023

Burial of Fe bearing precursors to ‘chemical sediments’ in the deep past Open

Romain Guilbaud, E. Boulard, Benoı̂t Baptiste, Ludovic Delbes, Ludovic Menjot , et al. · 2023

The Sedimentary Geochemistry and Paleoenvironments Project Open

Úna C. Farrell, Rifaat Samawi, Savitha Anjanappa, Roman Klykov, Oyeleye O. Adeboye , et al. · 2021

We thank the donors of The American \nChemical Society Petroleum Research Fund for partial support of \nSGP website development (61017-ND2). EAS is funded by National \nScience Foundation grant (NSF) EAR-1922966

Curation and Analysis of Global Sedimentary Geochemical Data to Inform Earth History Open

Akshay Mehra, C. Brenhin Keller, Tianran Zhang, Nicholas J. Tosca, S. M. McLennan , et al. · 2021

Large datasets increasingly provide critical insights into crustal and surface processes on Earth. These data come in the form of published and contributed observations, which often include associated metadata. Even in the best-case scenar…

Testing links between the pre-GOE iron cycle and oxygenation using triple iron isotopes Open

Andy W. Heard, Nicolas Dauphas, Nicole X. Nie, Ian B. Butler, Andrey Bekker , et al. · 2021

Triple iron isotope constraints on the role of ocean iron sinks in early atmospheric oxygenation Open

Andy W. Heard, Nicolas Dauphas, Romain Guilbaud, Olivier Rouxel, Ian B. Butler , et al. · 2020

The iron did it What factors controlled the accumulation of atmospheric oxygen gas (O 2 ) early in the history of Earth? Heard et al. used high-precision iron isotopic measurements of Archean-Paleoproterozoic sediments, with ages between 3…

Phosphorus-limited conditions in the early Neoproterozoic ocean maintained low levels of atmospheric oxygen Open

Romain Guilbaud, Simon W. Poulton, Jennifer Thompson, Kathryn F. Husband, Maoyan Zhu , et al. · 2020

The Ediacaran–Cambrian transition: the emerging record from Small Carbonaceous Fossils (SCFs) Open

Ben J. Slater, Thomas H. P. Harvey, Romain Guilbaud, Sebastian Willman, Graham E. Budd , et al. · 2019

The Ediacaran–Cambrian transition: the emerging record from Small Carbonaceous Fossils (SCFs)

Oxygen minimum zones in the early Cambrian ocean Open

Romain Guilbaud, Ben J. Slater, Simon W. Poulton, Thomas H. P. Harvey, Jochen J. Brocks , et al. · 2018

The relationship between the evolution of early animal 26 communities and oceanic oxygen levels remains unclear. In particular, uncertainty persists in reconstructions of redox conditions during the pivotal early Cambrian (541-510 million …

A palaeoecological model for the late Mesoproterozoic – early Neoproterozoic Atar/El Mreïti Group, Taoudeni Basin, Mauritania, northwestern Africa Open

Jérémie Beghin, Romain Guilbaud, Simon W. Poulton, Nur Gueneli, Jochen J. Brocks , et al. · 2017

A cryptic record of Burgess Shale‐type diversity from the early Cambrian of Baltica Open

Ben J. Slater, Thomas H. P. Harvey, Romain Guilbaud, Nicholas J. Butterfield · 2016

Exceptionally preserved ‘Burgess Shale‐type’ fossil assemblages from the Cambrian of Laurentia, South China and Australia record a diverse array of non‐biomineralizing organisms. During this time, the palaeocontinent Baltica was geographic…

Low-oxygen waters limited habitable space for early animals Open

Rosalie Tostevin, Rachel Wood, Graham Shields, Simon W. Poulton, Romain Guilbaud , et al. · 2016

Towards a palaeoecological model of the Mesoproterozoic Taoudeni Basin, Mauritania, Northwestern Africa: implications for early eukaryote evolution Open

Jérémie Beghin, Romain Guilbaud, Simon W. Poulton, Nur Gueneli, Jochen J. Brocks , et al. · 2016

peer reviewed

A global transition to ferruginous conditions in the early Neoproterozoic oceans Open

Romain Guilbaud, Simon W. Poulton, Nicholas J. Butterfield, Maoyan Zhu, Graham Shields · 2015

(Table S7B) Geochemical analysis of Site 6, Arasab: Shales Open