Paleomagnetic data show less than ∼1000 kilometers of motion between the paleomagnetic and hotspot reference frames—that is, true polar wander—during the past 100 million years, which implies that Earth's rotation axis has been very stable. This long-term rotational stability can be explained by the slow rate of change in the large-scale pattern of plate tectonic motions during Cenozoic and late Mesozoic time, provided that subducted lithosphere is a major component of the mantle density heterogeneity generated by convection. Therefore, it is unnecessary to invoke other mechanisms, such as sluggish readjustment of the rotational bulge, to explain the observed low rate of true polar wander.

An explanation for Earth's long-term rotational stability

SPADA, GIORGIO;
1997

Abstract

Paleomagnetic data show less than ∼1000 kilometers of motion between the paleomagnetic and hotspot reference frames—that is, true polar wander—during the past 100 million years, which implies that Earth's rotation axis has been very stable. This long-term rotational stability can be explained by the slow rate of change in the large-scale pattern of plate tectonic motions during Cenozoic and late Mesozoic time, provided that subducted lithosphere is a major component of the mantle density heterogeneity generated by convection. Therefore, it is unnecessary to invoke other mechanisms, such as sluggish readjustment of the rotational bulge, to explain the observed low rate of true polar wander.
SCIENCE
M. A. RICHARDS; Y. RICARD; C. LITHGOW BERTELLONI; SPADA, GIORGIO; R. SABADINI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/772137
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