Abstract
Tobago consists chiefly of Mesozoic igneous and metamorphic rocks of oceanic island arc affinity. During a four year programme of geological mapping of the island we had access to aeromagnetic data which showed large amplitude, E-W trending linear anomalies mainly associated with highly magnetic plutonic rocks. Using the pseudogravity transform and a subsequent mapping of local maxima of the horizontal gradients we created raster images of the edges or boundaries of the causative magnetic bodies. Thresholding of the boundary pixels allowed noise to be filtered and the most significant boundaries to be chosen. When combined with digitised field-mapped geological boundaries a useful format was created that allowed us to validate some of the field boundaries, investigate unexplained features and interpret structures.
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