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Index Geophysics

Long-wavelength aeromagnetic anomalies and deep crustal magnetization in Manitoba and Northwestern Ontario, Canada

Item

Title (Dublin Core)

en-US Long-wavelength aeromagnetic anomalies and deep crustal magnetization in Manitoba and Northwestern Ontario, Canada

Description (Dublin Core)

en-US A new type of aeromagnetic anomaly map (a long-wavelength anomaly map with anomaly widths in the range 60 km < λ < 4000 km) is presented for the area. It is believed that this group of anomalies represents a physically distinct field. This field shows considerable correlation with the broad features of deep crustal structure as derived from seismic sounding; linear relationships were found between the field and depths to the bottom of the crust and to the boundary between the upper and the lower crustal layers, as well as to the thickness of the lower crustal layer. A theoretical relationship connecting structure on magnetized layers to magnetic anomalies is given showing that the linear relationships are to be expected. It is shown that the lower crustal layer is the most likely source of the anomalies, with an intensity of magnetization of 5.3 X 10-3 emu/cc. It is also indicated that the upper crustal layer could also be the source, but that a shallow plate of magnetization could not explain the anomalies. Thus deep crustal magnetization must (on all interpretations made in the present paper), be responsible for the long-wavelength anomalies. Also, these anomalies are strongly related to major features in surface geology.
          ARK: https://n2t.net/ark:/88439/y012135
Permalink: https://geophysicsjournal.com/article/171
 

Creator (Dublin Core)

Hall, D.H.

Subject (Dublin Core)

en-US Long-Wavelength Aeromagnetic Anomalies
en-US Deep Crustal Magnetization
en-US Canadian Shield
en-US Data

Publisher (Dublin Core)

en-US Journal of Geophysics

Date (Dublin Core)

1974-11-28

Type (Dublin Core)

info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US Peer-reviewed Article

Format (Dublin Core)

application/pdf

Identifier (Dublin Core)

https://journal.geophysicsjournal.com/JofG/article/view/171

Source (Dublin Core)

en-US Journal of Geophysics; Vol 40 No 1 (1974): Journal of Geophysics; 403-430
2643-2986
2643-9271

Language (Dublin Core)

eng

Relation (Dublin Core)

https://journal.geophysicsjournal.com/JofG/article/view/171/131