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Earth’s early continental crust formed from wet and oxidizing arc magmas
The use of two zircon oxybarometers to simultaneously determine fO2 and H2O contents shows that Archaean granitoids were mostly formed from relatively oxidizing and H2O-rich magmas, probably at ancient subduction zones.
- Rong-Feng Ge
- , Simon A. Wilde
- & Xiao-Lei Wang
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Review Article |
Deep continental roots and cratons
Cratons are the oldest parts of the Earth’s continents; this Review concludes that the production of widespread, thick and strong lithosphere via the process of orogenic thickening was fundamental to the eventual emergence of extensive continental landmasses.
- D. Graham Pearson
- , James M. Scott
- & Peter B. Kelemen
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Article |
Oxygen isotopes trace the origins of Earth’s earliest continental crust
Oxygen isotopes and whole-rock geochemistry show that the water required to make Earth’s first continental crust was primordial and derived from the mantle, not surface water introduced by subduction.
- Robert H. Smithies
- , Yongjun Lu
- & Simon P. Johnson
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Letter |
Metamorphism and the evolution of plate tectonics
Variability in Earth’s thermal gradients, recorded by metamorphic rocks through time, shows that Earth’s modern plate tectonics developed gradually since the Neoarchaean era, three billion years ago.
- Robert M. Holder
- , Daniel R. Viete
- & Tim E. Johnson
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Letter |
Reverse weathering as a long-term stabilizer of marine pH and planetary climate
Elevated rates of reverse weathering within silica-rich oceans led to enhanced carbon retention within the ocean–atmosphere system, promoting a stable, equable ice-free climate throughout Earth’s early to middle ages.
- Terry T. Isson
- & Noah J. Planavsky