Geology & Earth Science

Geology & Earth Science Experts

Craig Johnson

The U.S. Geological Survey
United States Virgin Islands


Craig Johnson is a member of the Crustal Geophysics and Geochemistry Science Center in Denver. Craig attended Dartmouth (AB), Michigan (MS), and Yale (PhD). He held a NASA postdoc and a staff position at the American Museum of Natural History in New York prior to joining the USGS in 1992. Craig is responsible for a stable isotope laboratory in which isotopes of carbon, hydrogen, nitrogen, oxygen, and sulfur are measured in rocks, waters, gases, and biological materials. Craig studies ore genesis, environmental impacts of mining, the source and fate of solutes in natural waters and crustal fluids, the isotopic record of marine sulfate, and isotopic records of paleoenvironments.

Research Interest



  • Bouhlel, Salah, Leach, D.L., Johnson, C.A., Marsh, E., Salmi-Laouar, S., Banks, D.A., 2016, A salt diapir-related Mississippi Valley-type deposit: the Bou Jaber Pb-Zn-Ba-F deposit, Tunisia: fluid inclusion and isotope study: Mineralium Deposita, v. 51, p. 749–780.

  • Corral, Isaac, Cardellach, E., Corbella, M., Canals, A., Griera, A., Gomez-Gras, D., and Johnson, C.A., 2016, Origin and evolution of mineralizing fluids and exploration of the Cerro Quema Au-Cu deposit (Azuero Peninsula, Panama) from a fluid inclusion and stable isotope perspective: Ore Geology Reviews, v. 80, p. 947–960.

  • Johnson, C.A., Day, W.C., and Rye, R.O., 2016, Oxygen, hydrogen, sulfur, and carbon isotopes in the Pea Ridge magnetite-apatite deposit, southeast Missouri, and sulfur isotope comparisons to other iron deposits in the region: Economic Geology, v. 111, p. 2017–2032.

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