Skip to Main Content
Book Chapter

Rock Magnetism

January 01, 2015


A set of magnetic measurements (hysteresis loops, thermomagnetic curves, magnetic susceptibility, anhysteretic and isothermal remanences) were performed for samples collected from stratigraphic layers (basal ash, L1, 2a and 2b) of the Campanian Ignimbrite (CI) and from its marine equivalent, the Y5 tephra layer. Day plots, Lowrie–Fuller tests and interparametric ratios demonstrate that the carrier of the remanence is low Ti-magnetite with grain size mostly characterized by pseudo-single-domain (PSD) grains. The magnetite content increases toward the top, particularly in the uppermost 2b layer which is also characterized by smaller grain size. The distribution of the magnetic content is different among the different layers and it may reflect a primary signature as well as post-depositional transformation such as zeolitization and/or maghemitization. The magnetic data confirm the correlation between the CI and the Y5 tephra layer and indicate that a unique eruption was responsible for their emplacement. First-order reversal curve (FORC) diagrams clearly display that the plinian basal ash can be considered the only true source for the marine tephra layer. The results demonstrate the potential of magnetic methods to characterize pyroclastic flow deposits and provide support for the identification and correlation of distal tephra.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables


Geological Society, London, Special Publications

The Use of Palaeomagnetism and Rock Magnetism to Understand Volcanic Processes

M. H. Ort
M. H. Ort
Search for other works by this author on:
M. Porreca
M. Porreca
Search for other works by this author on:
J. W. Geissman
J. W. Geissman
Search for other works by this author on:
Geological Society of London
ISBN electronic:
Publication date:
January 01, 2015




A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now