Browsing Waterloo Research by Author "Nielsen, Sune"
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Fully oxygenated water columns over continental shelves before the Great Oxidation Event
Ostrander, Chadlin; Nielsen, Sune; Owens, Jeremy; Kendall, Brian; Gordon, Gwyneth; Romaniello, Stephen; Anbar, Ariel (Nature, 2019-02-25)Late Archaean sedimentary rocks contain compelling geochemical evidence for episodic accumulation of dissolved oxygen in the oceans along continental margins before the Great Oxidation Event. However, the extent of this ... -
Multiple negative molybdenum isotope excursions in the Doushantuo Formation (South China) fingerprint complex redox-related processes in the Ediacaran Nanhua Basin
Ostrander, Chadlin; Swapan, Sahoo; Kendall, Brian; Jiang, Ganqing; Planavsky, Noah; Lyons, Timothy; Nielsen, Sune; Owens, Jeremy; Gordon, Gwyneth; Romaniello, Stephen; Anbar, Ariel (Elsevier, 2019-09-15)The Ediacaran Doushantuo Formation offers one of the most complete and extensively studied records of end- Neoproterozoic biotic and environmental change. Here, we report multiple coeval negative molybdenum (Mo) ... -
Shale heavy metal isotope records of low environmental O2 between two Archean oxidation events.
Ostrander, Chadlin; Kendall, Brian; Gordon, Gwyneth; Nielsen, Sune; Zheng, Wang; Anbar, Ariel (Frontiers Media, 2022-04-26)Evidence of molecular oxygen (O₂) accumulation at Earth’s surface during the Archean (4.0–2.5 billion years ago, or Ga) seems to increase in its abundance and compelling nature toward the end of the eon, during the runup ...