The Archean continents,primarily composed of the felsic tonalite-trondhjemite-granodiorite(TTG)suite,were formed or conserved since～3.8 Ga,with significant growth of the continental crust since～2.7 Ga.The dif-ficulty in direct differentiation of the felsic crustal com-ponents from Earth's mantle peridotite leads to a requirement for the presence of a large amount of hydrated mafic precursor of TTG in Earth's proto-crust,the origin of which,however,remains elusive.The mafic proto-crust may have formed as early as～4.4 Ga ago as reflected by the Hf and Nd isotopic signals from Earth's oldest geo-logical records.Such a significant time lag between the formation of the mafic proto-crust and the occurrence of felsic continental crust is not reconciled with a single-stage scenario of Earth's early differentiation.Here,inspired by the volcanism-dominated heat-pipe tectonics witnessed on Jupiter's moon Io and the resemblances of the intensive internal heating and active magmatism between the early Earth and the present-day Io,we present a conceptual model of Earth's early crust-mantle differentiation,which involves an Io-like scenario of efficient extraction of a mafic proto-crust from the early mantle,followed by an intrusion-dominating regime that could account for the subsequent formation of the felsic continents as Earth cools.The model thus allows an early formation of the pre-TTG proto-crust and the generation of TTG in the conti-nent by providing the favorable conditions for its subse-quent melting.This model is consistent with the observed early fractionation of the Earth and the late but rapid for-mation and/or accumulation of the felsic components in the Archean continents,thus sheds new light on the early Earth's differentiation and tectonic evolution.

Qingwen Zhang;Dan Zhu;Wei Du;Yun Liu

State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;International Center for Planetary Science,College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China

地球化学学报（英文版）

[1]Qingwen Zhang;Dan Zhu;Wei Du;Yun Liu-.A model of crust-mantle differentiation for the early Earth)[J].地球化学学报（英文版）,2022(04):689-703

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