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作 者:Chong WANG Ross N.MITCHELL
机构地区:[1]State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
出 处:《Science China Earth Sciences》2023年第6期1165-1184,共20页中国科学(地球科学英文版)
基 金:supported by the National Natural Science Foundation of China(Grant Nos.42102243,41888101,41890833)the China Postdoctoral Science Foundation(Grant No.2022T150642);the Project of Chinese Academy of Sciences(Grant No.IGGCAS-201905).
摘 要:True polar wander(TPW),or planetary reorientation,is the rotation of solid Earth(crust and mantle)about the liquid outer core in order to stabilize Earth’s rotation due to mass redistribution.Although TPW is well-documented on Earth presently with satellites and for multiple planets and moons in the Solar System,the prevalence of TPW in Earth history remains contentious.Despite a history of controversy,both the physical plausibility of TPW on Earth and an empirical basis for it are now undisputed.Lingering resistance to the old idea likely stems from the fact that,like plate tectonics,TPW may influence much of the Earth system,thus acknowledging its existence requires rethinking how many different datasets are interpreted.This review summarizes the development of TPW as a concept and provides a framework for future research that no longer regards TPW like a ghost process that may or may not exist,but as an integral part of the Earth system that can relate shallow and deep processes that are otherwise only mysteriously linked.Specifically,we focus on the temporal regularity of large TPW,and discuss its relationship with the supercontinent-megacontinent cycle based on previous studies.We suggest the assembly of megacontinents has a close linkage to large TPW.Meanwhile,supercontinent tenure and breakup have a close linkage to fast TPW.The effects of TPW on sea level changes,paleoclimate,biological diversity,and other facets of the Earth system are presented and require interdisciplinary tests in the future.
关 键 词:True polar wander(TPW) Planetary reorientation Apparent polar wander(APW) Mantle convection Supercontinent cycle Megacontinent
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