Talk:Dike (geology)

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[edit] Question

What does "rotate the including sequence" mean? - Chris

Folding or tectonic deformation resulting from plate collisions, orogeny. This does need to be clarified in the article - put it on my to do list (means procrastinate :-) Vsmith 15:22, 15 Apr 2005 (UTC)

[edit] Picture

I seriously doubt that it's dike on this picture. Dikes are mainly composed of mafic rocks (basalt, diabase) because only rocks which are low in silica have sufficiently low viscosity to flow in such a narrow cracks. More silicic intrusions have much bigger aspect ratio (ratio of thickness to length). I believe that it's an anatexis (partial melting) on this picture. Siim 17:36, 12 March 2006 (UTC)

Mea culpa. I made a mistake. Most of these white narrow stripes are indeed products of partial melting but wider leucocratic structure seems to be intruded material, it means dike. I asked one experienced petrologist to comment that picture and he made it clear for me. Siim 16:17, 13 March 2006 (UTC)