Paleomagnetic detection of relative plate motions and an infrequently reversing core dynamo at 3.5 Ga
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Alec R. Brenner1,2*, Roger R. Fu1, Bradford J. Foley3, Diogo L. Lourenço4, Jasmine Palma-Gomez1, Zheng Gong1, Sarah C. Steele1, Joanna Li5,6, David T. Flannery7, Adrian J. Brown8, Eben B. Hodgin9 Whether early Earth had a mobile lithosphere and plate tectonics is debated. We present paleomagnetic data quantifying differential motion between lithospheric blocks at ~3.48 billion years ago (Ga). This manifested as 47+69 *35 centimeters per year latitudinal motion of the East Pilbara Craton (Western Australia) across high latitudes, whereas the Barberton Greenstone Belt (South Africa) was stationary at low latitudes. Comparison of this plate motion with candidate analogs suggests either rapid collisional plate tectonics (i.e., an “active-lid”) or an episodically mobile lithosphere. …
摘自《科学》(Science)第391卷 第6791期 · 2026年3月19日。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。