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Mineralogical Controls on Redox-Driven Phosphorus Cycling in the Precambrian Ferruginous Ocean

Objective

Earths early oxygenation history played a pivotal role in the evolution of complex life. Phosphorus (P) is widely recognised as the ultimate limiting nutrient on geological time scales, and hence P exerted a fundamental role in regulating global marine primary productivity, organic carbon burial, and ultimately the oxygen flux to the ocean-atmosphere system throughout the Precambrian Era (~4.60.541 billion years ago). Several geochemical proxies have been developed to reconstruct the Precambrian marine P reservoir and links to Earths oxygenation history, but all have inherent limitations linked to uncertainty over key processes involved in P cycling. In particular, mineralogical controls on P cycling under anoxic ferruginous (Fe(II)-containing) conditions, which reflect the dominant redox state of the ocean throughout most of the Precambrian, are very poorly understood. One such process concerns the extent of P uptake to (meta)stable, mixed-valence green rust, which has emerged as a key mineral precipitating in Precambrian ferruginous oceans, and the subsequent behaviour of P upon ageing to magnetite and Fe-rich clay minerals. Therefore, the PaleoNutrient project will investigate these key processes by a series of carefully controlled experiments performed under Precambrian ferruginous ocean conditions. These experimental results will then be validated by geochemical and mineralogical investigation of select Precambrian marine rocks deposited under varying types of ferruginous oceanic conditions. The new insight gained from experiments and the evaluation of the rock record will then be used to update existing biogeochemical models, with an ultimate aim to revolutionise our understanding of bioavailable P, primary productivity, and hence Earths oxygenation history across critical intervals of the Precambrian Era that dictated the trajectory of Earths habitability.

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

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(opens in new window) HORIZON-MSCA-2024-PF-01

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Coordinator

UNIVERSITY OF LEEDS
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 260 347,92
Address
WOODHOUSE LANE
LS2 9JT Leeds
United Kingdom

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Region
Yorkshire and the Humber West Yorkshire Leeds
Activity type
Higher or Secondary Education Establishments
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Total cost

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