Benjamin Johnson


Dept:Geological And Atmospheric Sciences
2237 Osborn Dr
Ames IA


Ph.D. Earth and Ocean Sciences, University of Victoria, 2017
M.Sc. Geology and Geophysics, University of Utah, 2009
B.Sc. Geology, University of Puget Sound, 2006

I am a geologist and geochemist with broad interests that span Earth History, Earth System Science, and Astrobiology. I use a variety of rock archives, including chemical sediments, glacial tills, and igneous rocks as records of the interactions between life, the oceans, the atmosphere, and the solid Earth over deep time. I access these archives through field work, analytical and isotope geochemistry, and numerical modeling to investigate deep time questions about Earth history.

Teaching Interests
Earth History, Sedimentary Geology, Field Camp, Astrobiology, Isotope Geochemistry

Recent Publications

Johnson, Benjamin W. and Wing, Boswell. accepted. Altered ocean crust reveals an 18O-enriched early Archean ocean. Nature Geoscience.

Johnson, Benjamin W. and Goldblatt, Colin. 2018. EarthN: A new Earth System Nitrogen Model. Geochemistry, Geophysics, Geosystems. 1-27.

Johnson, Benjamin W., Poulton, Simon F., and Goldblatt, Colin. 2017. Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth. Nature Communications. 8:1316

Johnson, Benjamin W. and Goldblatt, Colin. 2017. A secular increase in continental crust nitrogen during the Precambrian. Geochemical Perspectives Letters, 4:24-28

Johnson, Benjamin W., *Drage, Natashia, Spence, Jody, Hanson, Nova, El-Sabaawi, Rana, and Goldblatt, Colin. 2017. Measurement of geologic N using mass spectrometry, colourimetry, and a newly adapted fluorometry technique. Solid Earth, 8(2):307– 318.

Johnson, Benjamin W. and Goldblatt, Colin. 2015. The Nitrogen Budget of Earth. Earth Science Reviews, 148, 150-173