Talk:Intrusive rock

This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Petrology". Encyclopædia Britannica (11th ed.). Cambridge University Press.

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)

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))

so its like making valccanoes... — Preceding unsigned comment added by 68.97.27.152 (talk) 16:40, 29 November 2013 (UTC)

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)

Suger Loaf is not made up of granite

Sugar Loaf (Pão de Açucar) is made up of augen gneiss, that is, a metamorphic rock originated from porphyritic granite. Therefore, it is not a plutonic rock body and the image must be deleted.Amotoki (talk) 02:16, 23 May 2008 (UTC)

Combination or hybrid types - volcano/lacolith

Is someone with more geological knowledge than me willing to add a section or sections – including diagrams such as a geologic cross-section – describing combination types? Particularly, I am aware that there is such a thing as a volcano/lacolith (I am not aware if there is a standard terminology to apply here), because there are two of these in the San Francisco Mountain volcanic field near Flagstaff Arizona: Elden Mountain, and Slate Mountain. These features are partly intrusive and partly extrusive – surrounding field rock layers have been bent back as in a lacolith, but apparently the layers ruptured allowing extrusion onto the surface as well. It would seem logical to include a discussion on this topic or topics here. Cluginbuhl (talk) 00:22, 24 July 2019 (UTC)

Move discussion in progress

There is a move discussion in progress on Talk:Pluton which affects this page. Please participate on that page and not in this talk page section. Thank you. —RMCD bot 07:01, 8 November 2020 (UTC)