Carnegie Earth & Planets Laboratory
Meet Steve Shirey, DTM Staff Scientist
Steve is interested in how Earth's continents formed. Although Earth is called the water planet it also could be called the continent planet. Continent formation spans most of Earth history, continental rocks retain a geologic record of Earth's geodynamic processes, and continents were the key to the emergence of subaerial life and concentration of Earth's resources. Understanding continent formation requires the study of rocks whose ages range from very ancient to very young and could have formed anywhere from the deep mantle to the upper crust. It requires thinking on microscopic as well as global scales. It encompasses a wide range of studies: continental volcanic rocks, ancient and present subduction zones, crust-mantle evolution now and in the past, and the deep mantle keels to the continents. Even the present oceanic mantle can be viewed an analog to pre-continental, oceanic mantle (Hadean to Paleoarchean; 4500 to 3200 million years ago) -the original source of continental crust.
RESEARCH INTERESTS
Igneous petrology; isotope geochemistry; trace element geochemistry; geochemical evolution of the Earth's crust and mantle
ACADEMICS
B.A., 1972, Dartmouth College
M.S., Geology, 1975, University of Massachusetts
Ph.D., Geochemistry, 1984, State University of New York, Stony Brook