Chapter 4 Regional magnetic domains of the Circum-Arctic: a framework for geodynamic interpretation

Author:

Saltus R. W.1,Miller E. L.2,Gaina C.3,Brown P. J.1

Affiliation:

1. U.S. Geological Survey, Mail Stop 964, Box 25046, Denver, CO 80225-0046, USA

2. Stanford Geology, Stanford University, Stanford, CA, USA

3. Norwegian Geological Survey (Norges Geologiske Undersøkelse), Trondheim, Norway

Abstract

AbstractWe identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and large igneous province domains. We compare the magnetic domains with topography/bathymetry, regional geology, regional free air gravity anomalies and estimates of the relative magnetic ‘thickness’ of the crust. Most of the domains and their geodynamic classification assignments are consistent with their topographic/bathymetric and geological expression. A few of the domains are potentially controversial. For example, the extent of the Iceland Faroe large igneous province as identified by magnetic anomalies may disagree with other definitions for this feature. Also the lack of definitive magnetic expression of oceanic crust in Baffin Bay, the Norwegian–Greenland Sea and the Amerasian Basin is at odds with some previous interpretations. The magnetic domains and their boundaries provide clues for tectonic models and boundaries within this poorly understood portion of the globe.

Publisher

Geological Society of London

Subject

Geology

Reference50 articles.

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