Hierarchical self-organization of tectonic plates

TL;DR

This study reveals a 100-million-year cyclic pattern in Earth's tectonic plate organization, showing large plates oscillate between hierarchical states, indicating a dynamic interplay between different tectonic driving forces.

Contribution

It uncovers a cyclic fluctuation in large tectonic plate hierarchy over 100 million years, a novel insight into Earth's tectonic evolution.

Findings

Large and small plates exhibit distinct hierarchical patterns.

Large plates oscillate between weak and strong hierarchical states.

A 100-million-year cycle in tectonic organization is identified.

Abstract

The Earth's surface is subdivided into eight large tectonic plates and many smaller ones. We reconstruct the plate tessellation history and demonstrate that both large and small plates display two distinct hierarchical patterns, described by different power-law size-relationships. While small plates display little organisational change through time, the structure of the large plates oscillate between minimum and maximum hierarchical tessellations. The organization of large plates rapidly changes from a weak hierarchy at 120-100 million years ago (Ma) towards a strong hierarchy, which peaked at 65-50, Ma subsequently relaxing back towards a minimum hierarchical structure. We suggest that this fluctuation reflects an alternation between top and bottom driven plate tectonics, revealing a previously undiscovered tectonic cyclicity at a timescale of 100 million years.