The Search for Atmospheric Oxygenation Prior to the Great Oxidation Event (GOE) Chad Ostrander, Moutusi Roy and Ariel Anbar Arizona State University The.

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Presentation transcript:

The Search for Atmospheric Oxygenation Prior to the Great Oxidation Event (GOE) Chad Ostrander, Moutusi Roy and Ariel Anbar Arizona State University The Arizona Space Grant Undergraduate Research Symposium April 18 th, 2015

Problem: The timing of the first appearance of oxygen in the Earth’s surface environment is still ambiguous Lyons, Reinhard and Planavsky, 2014

A Whiff of Oxygen Before the Great Oxidation Event? Anbar et al., 2007 Molybdenum (Mo) enrichments in carbon-rich Mt. McRae Shale (~2.5 Ga) Mo is mobilized by oxidative weathering of continental sulfides In oxygenated waters, molybdate (MoO 4 2- ) has very long residence time of 800,000 years In sulfide-rich, anoxic waters, molybdenum is readily removed from solution 40 ppm Mo enrichment

Agouron Institute Drilling Project (AIDP): 2012 AIDP-1: Greenschist facies AIDP-2: Carbonate and Shale AIDP-3: Offshore version of AIDP-2 Shale nearly 200 Myrs older than Mt. McRae!

Core Drilling Sample removal Powdering  Core drilled Summer, 2012  Transported to ASU Summer 2013 Sampling workshop  Targeted samples extracted Summer 2013 – Spring 2014 Powdering of samples

Analysis DigestionAshing  Ashing and Acid Digestion Spring 2014 – Fall 2014 Combination of nitric acid (HNO 3 ), hydrofluoric acid (HF) and hydrochloric acid (HCl).  Trace Metal analysis Fall 2014 – Spring 2015 Inductively Coupled Plasma – Mass Spectrometry (ICP-MS)

Preliminary Results 7 ppm Mo enrichment Modified from Olson, 2015.

Interpretation/Future Work Enrichment possesses all hypothesized signals for oxidative weathering of continental crust and deposition during sulfide-rich oceanic anoxia. Smaller “whiff” may be due to progressive atmospheric oxygenation. How much O 2 is needed for Mo mobilization? Data from coordinated strata in S. Africa (Griqualand and Transvaal Basins). Mo isotope data from AIDP-2 enrichment interval may help tell story.

References Anbar, A.D., Duan, Y., Lyons, T.W., Arnold, G.L., Kendall, B., Creaser, R.A., Kaufman, A.J., Gordon, G.W., Scott, C., Garvin, J., Buick, R A Whiff of Oxygen Before the Great Oxidation Event? Science, 317, Lyons, T.W., Reinhard, C.T., and Planavsky, N The Rise of Oxygen in Earth’s Early Ocean and Atmosphere. Nature, 506, Olson, Stephanie. University of California, Riverside. March 16, Personal Communication. Acknowledgements We thank ASU NASA Space Grant, Agouron Institute, and the National Science Foundation for supporting AIDP as well as Trevor and Jeffrey Martin for their assistance with sample processing. For more information about Agouron Institute Drilling Project, visit:

Modern molybdenum sources and sinks In oxygenated waters, molybdate (MoO 4 2- ) has very long residence time of 800,000 years In sulfide-rich, anoxic waters, molybdenum is readily removed from solution (i.e. Black Sea) Chemocline Fe/Mn oxides MoO 4 2-

Dawn of GOE molybdenum sources and sinks O2O2 O2O2 Chemocline In oxygenated waters, molybdate (MoO 4 2- ) has very long residence time of 800,000 years In sulfide-rich, anoxic waters, molybdenum is readily removed from solution (i.e. Black Sea)