MagNetZ With Marco Maffione (2022/03/16) - Tilt Correction vs Net Tectonic Rotation
Channel: MagNetZ
Date: 17/03/2022

Tilt Correction versus Net Tectonic Rotation in paleomagnetic analysis

The video is also available for download at: https://earthref.org/ERDA/2518/
and can be referenced with the doi: 10.7288/V4/ERDA/2518

Title: Tilt Correction versus Net Tectonic Rotation in paleomagnetic analysis
Author: Marco Maffione from the University of Birmingham, UK

Paleomagnetic directions from sedimentary and volcanic rocks have been widely used in a variety of applications, including the analysis of deformation of small crustal domains up to entire tectonic plates. This analysis requires reconstruction of the paleomagnetic direction when the studied rock was in its original position (i.e., horizontal for sedimentary rocks). This “original” paleomagnetic direction is typically obtained by correcting the observed direction (i.e., in situ direction) for the local tilt. This new “tilt-corrected” direction is then compared to a reference direction from a stable plate at a given time period to determine potential vertical-axis rotations and the paleolatitude of the studied rock. This approach, known as “tilt correction”, has, however, several limitations. In this presentation I will analyse the pros and cons of the tilt correction analysis, and discuss an alternative method called “net tectonic rotation (NTR) analysis”. I will then provide a general overview of the NTR analysis, with some examples of its application to sheeted dykes from ophiolitic complexes.

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00:00 - Intro
01:07 - Presentation
29:58 - Questions
43:19 - Announcements