JOHN KARL BOHLKE Ph.D. University of California, Berkeley, 1986

Adjunct Assistant Professor
U.S. Geological Survey National Center, 
MS 431 Reston, VA 20192 
Tel: (703) 648-6325 FAX: (703) 648-5274 
jkbohlke@usgs.gov

Research Interests
General research interests: sources of fluids and dissolved constituents in the Earth's crust, mass transfers and buffering mechanisms during fluid-rock interactions, stable and radioactive isotope geochemistry, geochronology [Recent studies include: watershed solute fluxes, ground-water residence times and records of the past, history and fate of nitrate and other non-point-source contaminants in ground water.