摘要: Crosscutting veins found in almost all rock types are perhaps the easiest structures to pick up by novices. One can deduce stress directions studying attitude of veins. Veins develop commonly orthogonal maximum instantaneous extension axis, and have been considered as a good shear sense indicator. Thus, careful study complex vein systems has proved fruitful tectonic studies. Passchier Trouw described morphologically fibrous massive. These two either sharp or fuzzy margins. Leucosome cutting across alternate leucosome melanosome layers common migmatites. A recent review on origin is available Bons et al.
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