146Sm-142Nd Isotopic Constraints on the Origin of Earth's First Crust
The understanding of the origin of Earth's earliest crust is incomplete due to the limited rock record in the first billion-year of Earth's history.The short-lived isotope system,146Sm-142Nd,taking advantage of its short half-life of 103 Ma,is especially effective in tracing the chemical differentiation of incompatible elements during the Hadean and thus constraining the origin of the first crust on Earth.Studies show that multiple mantle depletion events may have occurred on the early Earth that were likely caused by the formation of massive proto-crust.The massive proto-crust is not only the likely progenitor of the oldest preserved igneous rocks on Earth,but also has served as the nuclei for the formation of Neoarchean continent.Here in this review article,the isotopic systematics and the analytical methods of 146Sm-142Nd were reviewed,and the current models for the formation of Earth's earliest crust were discussed based on a compilation of 142Nd isotopic anomaly data of ancient samples from global Eoarchean terranes.
early Earthrocks142NdHadeanisotopic anomalyextinct nuclidegeochemistry
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