The Magnetisation of the Lower Continental Crust
- Robert F. Mereu,
- Stephan Mueller and
- David M. Fountain
Published Online: 9 APR 2013
Copyright 1989 by the American Geophysical Union
Properties and Processes of Earth's Lower Crust
How to Cite
Hahn, A. G. and Roeser, H. A. (1989) The Magnetisation of the Lower Continental Crust, in Properties and Processes of Earth's Lower Crust (eds R. F. Mereu, S. Mueller and D. M. Fountain), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM051p0247
- Published Online: 9 APR 2013
- Published Print: 1 JAN 1989
Print ISBN: 9780875904566
Online ISBN: 9781118666388
order to obtain a range of magnetisations for the lower crust, two approaches are adopted.
– Interpretation of aeramagnetic and satellite measurements displaying anomalies more than 100 km across gives magnetisations in the range 0 to 6 A/m.
– Among the interpretations of Magsat data, a magnetisation model for the whole crust of the Earth was developed which uses magnetisations in the range 0 to 2.5 A/m.
The magnetisation of rock samples pertaining to the probable inventory of the lower crust is then considered, in order to come to conclusions about the composition of the lower crust. In doing so, it was found that rock samples of old shields exhibit magnetisations great enough to explain almost all magnetisation values required by distinct model bodies for the interpretation of field anomalies. On the other hand, samples of the lower crustal part of elevated crustal blocks generally possess too small a magnetisation compared with this. Xenoliths have magnetisations of sufficient strength, but there are doubts about their being really representative