Talk:Intrusion

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[edit] Diapir redirect

I clicked on Diapir and got redirected here, but there is no mention of Diapir. What's Diapir?67.118.118.184 00:21, 1 Feb 2005 (UTC)

It's there. Page down toward the bottom. -Vsmith 01:39, 1 Feb 2005 (UTC)

[edit] Intrusive redirect

I hope it's temporary that "diapir", "pluton" and "intrusive" redirect here. All these terms need own article although it's okay to write about them briefly here too. I am not sure about english geological traditions but in Estonia we see intrusive and intrusion as a slightly different things. Intrusion can be both, upward moving body of magma and solidified magmatic rock body but intrusive is only crystallized magmatic body which is not moving buoyantly anymore. Volcanology as a category also creates questions because volcanism is extrusive not intrusive phenomena. They are connected of course which makes that a complicated issue but I would not add cat. "Volcanology" here. Why is a mud volcano here is also something I don't understand. Siim 09:31, 4 August 2005 (UTC)

Ok, made a little research and yes, pluton and intrusion are usually synonymous, although some authors say that pluton is only large scale intrusion. Intrusive and intrusion also seem to have a same meaning but diapir needs own article. Diapir can be type of intrusion if it's a magma diapir. Unfortunately are diapir and intrusion both terms which can be used for both igneous and sedimentary rocks, which makes terminology quite confusing. Siim 14:52, 4 August 2005 (UTC)

I've seen intrusion used for igneous and other formations. It focuses on the process of intrusion rather than the specific material. (SEWilco 17:41, 4 August 2005 (UTC))

In English, "intrusion" can mean either the act of intruding or the resulting condition, and the meanings are applied to geologic activity and deposits. In Siim's definition, "intrusive" describes some cooled igneous rock deposits which had in the past been intrusions. I think Siim is implying meanings between "intrusion" and "intrusive" which are significantly different, while the present article is not distinguishing much between an ongoing intrusion and deposits created by past intrusion. (SEWilco 21:13, 4 August 2005 (UTC))

Siim might to be applying a definition of volcanology which only applies to an active volcano at the surface, thus excluding magma chambers which are not connected to the surface. Something can only be "extrusive" if material is being expelled. I think the present Category:Volcanology is applied to any molten rock in the Earth's crust, and thus includes intrusive material. (SEWilco 21:13, 4 August 2005 (UTC))

Mud volcano is here because it, and mud diapirs, intrude through existing rock layers. (SEWilco 21:13, 4 August 2005 (UTC))

[edit] Diapir moved

I have moved the diapir material to Diapir (formerly it was piercement structure, but I renamed/moved it). Geologically intrusive implies igneous - whereas diapir was used more for non-igneous material, yeah also some overlap. Anyway, I have made the terminology more consistent with petrologic and geologic usage.

Also deleted the mud volcano bit and made it a see also, as mud volcanoes are not igneous related nor intrusive per se. Vsmith 03:22, 6 December 2005 (UTC)