SIMS and NanoSIMS analyses of Mesoproterozoic individual microfossils indicating continuous oxygen-producing photosynthesis in Proterozoic Ocean

Xiaotong Peng1, Zixiao Guo2, Christopher H House3, Shun Chen4 and Kaiwen Ta1, (1)Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China, (2)Sanya Institute of Deep-sea Science and Engineering, Sanya, China, (3)Pennsylvania State University, Geosciences and Penn State Astrobiology Research Center, University Park, PA, United States, (4)Sanya Institute of Deep-sea Science and Engineering, Deep-sea Science Division, Sanya, China