The cooling models of Earth’s early mantle  

作　　者：Ting He Qingwen Zhang Yun Liu 

机构地区：[1]Research Center for Planetary Science,College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China [2]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

出　　处：《Acta Geochimica》2023年第5期803-816,共14页地球化学学报（英文）

基　　金：supported by the strategic priority research program(B)of CAS(XDB41000000);Chinese NSF projects(42130114);the pre-research Project on Civil Aerospace Technologies No.D020202 funded by the Chinese National Space Administration.

摘　　要：The thermal state of the early Earth’s interior and its way of cooling are crucial for its subsequent evo-lution.Earth is initially hot as it acquired enormous heat in response to violent processes during its formation,e.g.,the Moon-forming giant impact,the segregation and formation of its metallic core,the tidal interaction with the early Moon,and the decay of radioactive elements,etc.In the meantime,the cooling mechanisms of early Earth’s mantle remain elusive despite their importance,and the previously proposed cooling models of the mantle are controversial.In this paper,we first reviewed several prevalent parameter-ized thermal evolution models of the early mantle.The models give unrealistic predictions since they were estab-lished solely based on a single tectonic regime,such as the stagnant-lid regime,or relied on the disputable existence of the plate tectonics prior to-3.5 Ga.Then we argue that the mantle should have started to cool down from a very hot state after the solidification of the ferocious magma ocean.Instead of using one single scaling law to describe a single-stage model,we suggest that an episodic multi-stage cooling model(EMCM)of the early mantle could be more plausible to account for the mantle’s early cooling process.The model reconciles with the fact that the mantle cools down from a hot state prior to*3.5 Ga and can also explain the well-constrained post-3.5 Ga thermal history of the mantle.

关 键 词：Thermal evolution MANTLE Parameterized model Episodic cooling Early mantle 

分 类 号：P542.5[天文地球—构造地质学]