Nature of the Earth's earliest crust from hafnium isotopes in single detrital zircons

  title={Nature of the Earth's earliest crust from hafnium isotopes in single detrital zircons},
  author={Yuri Amelin and Der-Chuen Lee and Alexander N. Halliday and R. T. Pidgeon},
Continental crust forms from, and thus chemically depletes, the Earth's mantle. Evidence that the Earth's mantle was already chemically depleted by melting before the formation of today's oldest surviving crust has been presented in the form of Sm–Nd isotope studies of 3.8–4.0 billion years old rocks from Greenland and Canada. But this interpretation has been questioned because of the possibility that subsequent perturbations may have re-equilibrated the neodymium-isotope compositions of these… 
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This λ176Lu value indicates that Earth's oldest minerals were derived from melts of a mantle source with a time-integrated history of depletion rather than enrichment, consistent with timing inferred from extinct radionuclides.
No evidence for Hadean continental crust within Earth’s oldest evolved rock unit
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Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago
The discovery of a detrital zircon with an age as old as 4,404 ± 8 Myr is reported, about 130 million years older than any previously identified on Earth and represents the earliest evidence for continental crust and oceans on the Earth.
Isotope-geochemical constraints on the formation of the early Earth’ crust
Analysis of isotope-geochemical data obtained for the early crustal complexes of the Earth provided constraints on the formation time, scales of development, and geochemical features of protocrust.
A Short Review on Lu-Hf Isotope System in Zircon: Implications for Crustal Evolution
Zircon has been recognized as the unaltered part of the Earth's history which preserves nearly 4 billion year record of earth's evolution. Zircon preserves igneous and metamorphic processes during


Constraints on early Earth differentiation from hafnium and neodymium isotopes
INFERENCES about the early evolution of the Earth's crust and mantle have come largely from the study of isotope systematics— in particular, those of neodymium1–5. Neodymium isotope data from the
Neodymium and lead isotope evidence for enriched early Archaean crust in North America
THERE has been considerable debate as to whether isotopically enriched continental crust was an important geochemical reservoir in earliest Archaean times. Fundamental questions such as the volume of
Evolution of continental crust and mantle heterogeneity: Evidence from Hf isotopes
We present initial 176Hf/177 Hf ratios for many samples of continental crust 3.7-0.3 Gy old. Results are based chiefly on zircons (1% Hf) and whole rocks: zircons are shown to be reliable carriers of
Jack Hills, evidence of more very old detrital zircons in Western Australia
The age of the Earth's oldest crustal minerals sets a time-limit on the earliest preservation of buoyant solid crust. The oldest mineral ages reported so far are ∼4,180 Myr for detrital zircons from