Talk:Dike (geology)
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Dike (geology) is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information. |
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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)
[edit] Volcano
Are dikes a type of volcano?—Preceding unsigned comment added by 209.105.206.130 (talk • contribs) 03:23, 29 July 2007
- No, but they are related. An intrusive (i.e. igneous) dike occurs when magma forces apart existing rock along a vertical plane, probably along an existing fault where the rock has been broken in slipping upward or laterally. The dike is the rock resulting when that magma solidified underground. A volcano is an extrusive feature, where magma flows upward and breaks thru to open space (air, water, vacuum on Mercury and moons). Volcanos are typically small rather than long, narrow, openings, presumably because the breakthru at the weakest point relieves the pressure that would be necessary to break thru elsewhere. As lava cools and solidifies near the vent, the volcanic cone of solidified rock builds up, producing a volcanic mountain. Intermediate between igneous dikes and volcanos is a breakthru to the surface all along a fault, with lava spilling out and spreading in a sheet (or two sheets, one on each side of the fault), producing features like the Deccan Traps or the Siberian Traps.
--Jerzy•t 08:19, 30 October 2007 (UTC)
