Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...67..251r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 67, Issue 3-4, p. 251-267.
Physics
5
Scientific paper
Lower Carboniferous lavas and intrusives from the southern margin of the Midland Valley, Scotland, have yielded a principal magnetization, termed the B component, with D, I = 192, +12; α95 = 5.9°. This magnetization is thought to have formed essentially during the original cooling, but evidence of low temperature mineralogical changes as well as the presence of dual-polarity remanence structures suggest that the magnetization processes continued beyond the deuteric stage, covering at least the time span of geomagnetic field inversions. An overprinted magnetization, the A1 component, of inferred Lower Tertiary age, has a mean direction of D, I = 188, -49 α95 = 3.5°. This secondary magnetization is found principally in three sites, two from silica veins and one from a basaltic neck, located within the Southern Uplands Fault Zone at Dunbar. Microscopic evidence suggests that the A1 overprint was acquired thermochemically through Alpine tectonic re-activation of the fault.
Rother K.
Storetvedt K. M.
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