Video wird geladen...

Video konnte nicht geladen werden

Zur Startseite

The angular steps identified from the VGP rotation analysis were then paired with time using Nami's stratigraphic and radiocarbon constraints. These time–angle pairs were used directly to parameterise the viscoelastic response model with a piecewise, data-driven return function in which both the timing and magnitude of each relaxation step...

28,306 Aufrufe • vor 4 Monaten •via X (Twitter)

0 Kommentare

Keine Kommentare verfügbar

Kommentare vom Original-Post werden hier angezeigt

Ähnliche Videos

This paper is describing something which sounds remarkably similar to an ECDO state 2 to state 1 rotation a half a billion years ago. Excerpts from Evidence for a Large-Scale Reorganization of Early Cambrian Continental Masses by Inertial Interchange True Polar Wander, Kirschvink et al. (1997): "..at least two tectonic plates, involving more than two-thirds of Earth's continental lithosphere, were involved in a rapid rotation of ~90° relative to the spin axis. We speculate that the entire lithosphere may have been involved in this rotation. // The new ages, along with paleomagnetic data, indicate that continents moved at rapid rates that are difficult to reconcile with our present understanding of mantle dynamics. // The pole for this sequence is >80° away from the Vendian-Early Cambrian poles, implying that Australia underwent a large rotation while remaining near the equator sometime between Tommotian and Late Cambrian time. // Australia rotated counterclockwise during this time. // Antarctica, India, Africa, South America, and perhaps parts of East Asia also rotated with Australia. // True polar wander (TPW) is the process through which quasi-rigid spheroids align their maximum moments of inertia with the spin axis, pushing positive mass anomalies toward the rotational equator. // A variant of this mechanism, inertial interchange true polar wander (IITPW), involves discrete bursts of TPW of up to 90° in geologically short intervals of time if the magnitudes of the intermediate and maximum moments of inertia cross. This would result in a rapid movement away from the spin axis by the geographic location of the former pole with rotation of the entire solid Earth centered about the minimum moment of inertia located on the equator. // These two poles, with their stated polarity interpretation, are separated by about 68°; together they yield a plausible tropical position for Siberia, nearly on the opposite side of the globe from Australia. // If the velocities are due to TPW, however, such geodynamical considerations are obviated because the entire mantle would have rotated along with the lithosphere." [1] [2] (by Ethical Skeptic ☀)

Craig Stone

16,334 Aufrufe • vor 1 Jahr