Geomagnetic field intensity in the middle jurassic - oligocene

TL;DR

This study analyzes geomagnetic field intensity from the Middle Jurassic to the Oligocene, revealing chaotic changes, intermittent regimes, and turbulence variations in Earth's liquid core over geological time.

Contribution

It provides a comprehensive analysis of paleointensity data across a broad time span, highlighting the chaotic nature and turbulence variations of Earth's geomagnetic field.

Findings

Paleointensity changes occurred chaotically with bursts and quiet periods.

CDF of paleointensity fits a power function with varying indices.

Turbulence in Earth's core was higher during the Cretaceous.

Abstract

The present paper summarizes results of the studies on the intensity of geomagnetic field in the (167 - 23) Ma interval by sedimentary rocks of the Russian Plate and adjacent territories. The joint analysis of the data paleointensity obtained by sedimentary and thermomagnetized (from PINT12) rocks within this temporal interval is conducted. It is shown that the changes of the paleointensity were occurred chaotically. Alternating bursts and periods of quiet regime of the geomagnetic field are typical for intermittent processes and is a characteristic of the geological interval Jurassic-beginning of Paleogene. The distributions of the paleointensity corresponding to different intervals of geologic time were investigated. It is revealed that the cumulative distribution function (CDF) of the paleointensity values is best approximated by a power function. The indices of the power functions varied depending on geologic time intervals.The analysis of the paleomagnetic data suggests that the medium in which the geomagnetic field is generated is turbulent. Turbulence in the Earth's liquid core is enhanced in the Cretaceous compared with Jurassic and Paleogene.