A stochastic view of lower crustal fabric based on evidence from the Ivrea zone

Détails

ID Serval
serval:BIB_34CB46155A52
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A stochastic view of lower crustal fabric based on evidence from the Ivrea zone
Périodique
Geophysical Research Letters
Auteur(s)
Holliger K., Levander A.
ISSN-L
0094-8276
Statut éditorial
Publié
Date de publication
1992
Peer-reviewed
Oui
Volume
19
Pages
1153-1156
Langue
anglais
Résumé
Despite its complicated history the Ivrea Zone is considered to be
a representative surface exposure of extended continental crust.
We have digitized two standard 1:25,000 geological maps from this
area and evaluated their structural statistics. Because of the subvertical
orientation of the Ivrea Zone these maps can be considered as small-scale
cross sections through the lower continental crust. The autocorrelation
functions of the digitized lithologies measured from these maps show
a clear self-similar or fractal rather than a Gaussian or deterministic
trend. We found that an anisotropic von Karman correlation function
with an aspect ratio around 4 and a Hurst number of 0.3, corresponding
to a fractal dimension of 2.7, matches the observed data. Our results
represent an explicit confirmation of previous indirect evidence
for the fractal nature of lithospheric heterogeneities and provide
the means to construct realistic crustal-scale seismic models of
Ivrea-type lower continental crust.
Mots-clé
CONTINENTAL-CRUST, SEISMIC PROPERTIES, REFLECTIVITY, SCATTERING, GEOPHYSICS, EVOLUTION, GEOLOGY, ROCKS, MODEL
Création de la notice
25/11/2013 19:27
Dernière modification de la notice
20/08/2019 14:21
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