People Directory : Dalton Hardisty

Dalton Hardisty

Dalton Hardisty

Postdoctoral Scholar

Geology & Geophysics

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B.S. Environmental Science, Mathematics minor, Indiana University, Bloomington, IN, 2005-2009

M.S. Geology, Indiana University, Bloomington, IN, 2009-2011

Ph.D. Geology, University of California Riverside, CA, 2011-2016

Research Interests

biogeochemistry, marine chemistry, sedimentology, ancient oxygen, carbonate paleoredox proxies, diagenesis

Research Statement

The evolving history of life and marine and atmospheric chemistry is both fascinating and fundamental to our understanding of the world today and it's future. My work focuses on determining the circumstances in which ocean chemistry might be archived in marine sediments. This includes studying the geochemistry of modern seawater and sediments, determining how post-depositional processes (diagenesis) might alter sediment geochemistry, as well as applications toward using the geochemistry of sedimentary rocks to reconstruct how ancient seawater contrasted with that of today. Specifically, I have focused on using the concentrations and isotopic ratios of redox-sensitive elements like iodine, sulfur, molybdenum, manganese, and iron, among others, to provide constraints on the availability of oxygen in the ancient ocean. My attention thus far has been focused on placing constraints on how ocean chemistry and early animal life co-evolved with the emergence and proliferation of oxygenic photosynthesis during the Precambrian. I'm also interested in determining the pre-anthropogenic Holocene history of seawater oxygen in coastal settings in order to provide a perspective on natural variable and the impacts and consequences of humans on ocean chemistry. At WHOI, I'm currently developing methods to use radiogeneic isotopes of iodine to trace redox reactions in seawater, which is ultimately anticipated to have impacts ranging from understanding modern atmospheric ozone cycling to records of ancient marine oxygen accumulation.
Starting in August 2018, I will be starting a faculty position in the Department of Earth and Environmental Sciences at Michigan State University.