%0 Journal Article %J Frontiers in Earth Science %D 2022 %T Shale heavy metal isotope records of low environmental O2 between two Archean oxidation events %A CM Ostrander %A B Kendall %A G Gordon %A SG Nielsen %A W Zheng %A A Anbar %B Frontiers in Earth Science %V 10 %P 833609 %G eng