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(2020) Variable and Elevated Oxygen in the Archean Atmosphere

Steadman JA, Large RR, Blamey NJ, Corkrey R & Danyushevsky LV

https://doi.org/10.46427/gold2020.2453

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14j: Plenary Hall, Tuesday 23rd June 08:12 - 08:15

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Kenneth Bolster on Tuesday 23rd June 01:15
Do you know whether the trends you're seeing are global, or how strongly they would be influenced by local processes?
Hi Ken, We do believe that these signals are global, but we also acknowledge that in certain formations there are variations which likely indicate local processes (e.g., changes in nutrient supply). However, the first-order trends in our curve are recorded in samples from multiple time-equivalent formations that were not in close proximity to each other during deposition.

Submitted by Mingsong Li on Tuesday 23rd June 02:57
Thanks for this wonderful reconstruction of the Archean atmosphere. The pyrite formed in sediments. It is easy to link its element ratio to the redox status of sediments. Can you explain more about how it can be linked-to atmosphere O2 levels?


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