Ancient Rocks Reveal When Earth’s Plate Tectonics Began

Tusch and Münker developed a powerful new method for extracting tiny traces of tungsten from ancient rocks. Then they went looking for the rocks. First they analyzed Archean rocks collected in the Isua region in western Greenland. Tusch spent 11 months analyzing the samples, but in the end his tungsten-182 data was flat, with no […]