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GEOLOGY COURSE stamps
I'm convinced we can amass images for an entire 1st year university geology course using only volcano stamps. Find a relevant stamp in the 'Themes' galleries, copy and paste it here, and describe the geology element it represents.
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Aaland 1993. 2,00mk. Diabase dyke.
This stamp shows a dolerite or diabase dyke (diabase is the preferred name in North America, while dolerite is the preferred name in the rest of the English-speaking world). Such dykes occur in regions of crustal extension and often occur in swarms of hundreds of individual dykes or sills radiating from a single volcanic centre.
Dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Can anyone provide more info?