Zircons, a mineral nearly as old as Earth itself, is a timekeeper, and also provides a chemical window into many geological phenomena, such as oxidation state. By determining the oxidation levels of the magmas that formed these detrital zircons, scientists are able to deduce the onset of crust-to-mantle recycling, weathering, and the supercontinent cycle. Credit: Science China Press Moving average of ΔFMQ of the igneous-derived and the sediment-derived zircon (proportion below than 10% is not shown) with the supercontinent amalgamation intervals. The more reduced magmas associated with sedimentary sources with a ca. 600 Ma cyclicity, became established at 2.6 billion years. Credit: Science China Press
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