Gibson, Paul and Lyle, P. and George, D.M.
(1996)
Ground-Based Magnetic Patterns Across Selected Irish Rocks and Structures.
Irish Journal of Earth Sciences, 15.
pp. 129-143.
ISSN 0790-1763
Abstract
Magnetic data acquired over a range of lithologies show the following: the Deer Park
Complex of Clew Bay exhibits different magnetic characteristics east and west of
Croagh Patrick. Very large magnetic signatures (4000-8000nT) occur in the west but
the anomahlies are significantly lower in the east. In addition, the peak anomaly
bounds the northern edge of the Deer Park Complex in the west but the southern edge
to the east Lower Palaeozoic volcanics flanking the Leinster Granite yield anomalies
of 300nT with a variance of 5-30nT, whereas those in the Kildare Inlier have a
variance of 20-100nT and anomalies of 700nT. The background variation in
magnetism for the Northern, Upper Liffey Valley and Lugnaquillia Units of the
Leinster Gramnite is 2-5nT (similar to the Lower Palaeozoic sediments into which the
gramnite is intruded) and structures are associated with anomalies of 30nT. The
magnetic variance within the Dalradian in County Tyrone is about 5nT and peak
anomalies of around 30nT have been obtained. Structures within Tertiary basalts and
gabbros produce anomalies of a similar magnitude (1000-2000nT), but the variance
for the basalts (300nT) is an order of magnitude greater than the variance of the
gabbros. Structures in a range of hlithologies (including Carboniferous limestone)
exhibit similar magnetic patterns, though the amplitude of the peak anomaly.
| Item Type: |
Article
|
| Keywords: |
Ground-Based Magnetic Patterns; Irish Rocks and Structures; |
| Academic Unit: |
Faculty of Social Sciences > Geography |
| Item ID: |
8856 |
| Depositing User: |
Paul Gibson
|
| Date Deposited: |
29 Sep 2017 10:45 |
| Journal or Publication Title: |
Irish Journal of Earth Sciences |
| Publisher: |
Royal Irish Academy |
| Refereed: |
Yes |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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