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One of my major areas of active research is the study of the earth's oldest rocks. Such studies take us back to about 4 Ga and into some of the most remote parts of the continents: southern Greenland, South Africa, the deserts of western Australia, and the Arctic areas of Siberia and Canada. Some of the oldest rocks we are currently studying are sedimentary rocks including sandstones, carbonates, and shales and associated volcanic rocks. In the past few years, my graduate students have done field work in such places as South Africa, southern India, and northern China. Our results are exciting and suggest that although plate tectonics probably operated on Earth more than 3 Ga, mantle plume activity was considerably more important in the Archean than it is today. Continents didn't appear until the Earth cooled enough for granite magmas to form, and it appears that the first major period of continental growth was between 3 and 2.5 Ga, when the first supercontinent formed.
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Geoscience Frontiersno. 4 (2024): 101821
Scientific Datano. 1 (2024): 56-56
CHEMICAL GEOLOGY (2024): 121868
GEOSCIENCE FRONTIERSno. 6 (2023): 101680-101680
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