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  3. Intrusion

Intrusion

5 items
Two polished rock slabs, each showing a dark black band next to an olive-green granular zone grading into white crystalline marble with dark grains.
Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia Sophie Graul
Metal electrode stake with a copper clamp and orange cable in a clump of grass on wet tidal mudflat, with a yellow cable looping away across the flat towards the horizon.
Geoelectrics in Wadden Sea Jonas Limbrock
Person in a yellow hard hat and blue shirt standing by a tall dark grey cliff of steeply tilted layered sediments, crossed diagonally by a pale brown dyke, with a yellow case on the ground.
Mesozoic Lamprophyre dyke crosscutting Ordovician sediments near Leading Tickles, Newfoundland, Canada Alexander Peace
Hand making a rock-and-roll horns gesture beside a dark vein cutting vertically through speckled grey granite, which branches near the middle and frames a small pale fragment.
Rocks! Stephan Kolzenburg
Close-up of dark grey banded rock crossed by wide veins of coarse pink and white crystals that meet in an X shape, with a few dry grass tufts in the cracks.
Geological Saltire Ruth Hindshaw

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