Can one use a prominence of two cross-cutting oblique linear structures to demonstrate the presence of a crustal shear movement?
Iso magnetic lines (lines of equal magnetic intensity) do not cross shear zone I would think. Instead, they bend one way or another parallel to shear zone.
As previously said, offsets between magnetic (or non-magnetic) marker horizons is a simple way of identifying faults from magnetic imagery. Amplitude of magnetic signal can also tell you where geological contacts occur, though this does not necessarily mean a fault/shear zone is present
It's important learn to discriminate between shear zones, dykes and others linear features non tectonics. And also, it's important to match your magnetics lineaments with some surface information (relief lineaments, field data or gammaspectometry map)
You can find some good information here:
GUNN PJ, MAIDMENT D & MILLIGAN PR. 1997. Interpreting aeromagnetic data in areas of limited outcrop. AGSO Journal of Australian Geology and Geophysics, 17(2): 175-185.
https://www.data.gov.au/dataset/interpreting-aeromagnetic-data-in-areas-of-limited-outcrop
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