Craig A Johnson, Ph.D.
Craig Johnson is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
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.
Science and Products
Stable isotope composition of waters in the Great Basin, United States 1. Air-mass trajectories
Stable isotope compositions of waters in the Great Basin, United States 2. Modern precipitation
Field trip day four: Road log for the Sterling Hill and Franklin Zinc Mines, New Jersey
Geochemical constraints on the origin of the Sterling Hill and Franklin zinc deposits, and the furnace magnetite bed, northwestern New Jersey
Sources of salinity near a coal mine spoil pile, north-central Colorado
Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains
On-line sulfur isotope analysis of organic material by direct combustion: Preliminary results and potential applications
Sulfur-, oxygen-, and carbon-isotope studies of Ag-Pb-Zn vein-breccia occurrences, sulfide-bearing concretions, and barite deposits in the north-central Brooks Range, with comparisons to shale-hosted stratiform massive sulfide deposits: A section in Ge
Fate of process solution cyanide and nitrate at three Nevada gold mines inferred from stable carbon and nitrogen isotope measurements
Mesoproterozoic graphite deposits, New Jersey Highlands: Geologic and stable isotopic evidence for possible algal origins
Syngenetic Au on the Carlin trend: Implications for Carlin-type deposits
Guatemala jadeitites and albitites were formed by deuterium-rich serpentinizing fluids deep within a subduction zone
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Stable isotope composition of waters in the Great Basin, United States 1. Air-mass trajectories
Stable isotope compositions of waters in the Great Basin, United States 2. Modern precipitation
Field trip day four: Road log for the Sterling Hill and Franklin Zinc Mines, New Jersey
Geochemical constraints on the origin of the Sterling Hill and Franklin zinc deposits, and the furnace magnetite bed, northwestern New Jersey
Sources of salinity near a coal mine spoil pile, north-central Colorado
Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains
On-line sulfur isotope analysis of organic material by direct combustion: Preliminary results and potential applications
Sulfur-, oxygen-, and carbon-isotope studies of Ag-Pb-Zn vein-breccia occurrences, sulfide-bearing concretions, and barite deposits in the north-central Brooks Range, with comparisons to shale-hosted stratiform massive sulfide deposits: A section in Ge
Fate of process solution cyanide and nitrate at three Nevada gold mines inferred from stable carbon and nitrogen isotope measurements
Mesoproterozoic graphite deposits, New Jersey Highlands: Geologic and stable isotopic evidence for possible algal origins
Syngenetic Au on the Carlin trend: Implications for Carlin-type deposits
Guatemala jadeitites and albitites were formed by deuterium-rich serpentinizing fluids deep within a subduction zone
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.