Talk:Granite

gravestone image

Unfortunately, The gravestone depicted is composed of slate, not granite. Perhaps it should be redirected to the slate article WaynaQhapaq (talk) 03:52, 29 March 2010 (UTC)

Which one? There are two images of gravestones. Wizard191 (talk) 15:25, 29 March 2010 (UTC)

The Hingham, Massachusetts gravestone is slate. The polished tombstone with the masonic square and compasses is indeed red granite. WaynaQhapaq (talk) 13:40, 6 April 2010 (UTC)

I removed it. Wizard191 (talk) 13:54, 6 April 2010 (UTC)

radiation

the section under natural radiation claims that a study (cited as source 14) says that 18 of 39 slabs of granite failed the European emmission standards of radiation. however, when clicking the link to the source cited after the statement (study done by Environmental Health & Engineering), the study ACTUALLY says that 0 of the 39 samples tested had levels that failed the standards. I don't know where the bad info came from. —Preceding unsigned comment added by 68.225.160.10 (talk) 01:34, 30 June 2010 (UTC)

I removed those quoted sections because they weren't supported by the cited source. Wizard191 (talk) 15:35, 30 June 2010 (UTC)

Replaced corrected version, seems it was vandalized over a year ago and didn't get caught until now. Thanks to the anon and Wizard191 for catching & removing it. Vsmith (talk) 23:35, 30 June 2010 (UTC)

Age of origin

Aren't most granite beds considered to have been formed in the Precambrian age? The ones in Sweden, Finland, European Russia and Canada certainly are precambrian, and so they are primitive rock. Strausszek (talk) 18:07, 5 July 2010 (UTC)

The oldest granites are Archaean more than 2500 million years old, but the youngest are Miocene less than 20 million years old, such as Mount Kinabalu in Sabah, and there are granites of all ages in between, including ones that are crystallising right now, that will be uplifted and exposed within the next few million years. Mikenorton (talk) 19:14, 5 July 2010 (UTC)

Granite is currently known only on Earth????

While this phrase may be technically be correct... Is it even relevant? At this point we've only explored a small fraction of our solar system, not to mention anything actually beyond our solar system. This article seems to indicate that there is some Granite on Mars. Perhaps more research will reveal more. Or, perhaps the majority of it will be found subsurface.

http://www.space.com/scienceastronomy/050706_mars_diverse.html --Keelec (talk) 14:37, 5 December 2010 (UTC)

Granitoid

I see this redirects to this article. It likely should not because the term granitoid includes igneous rocks that are not granite. I do not really have the interest to create an article from a redirect right now so if someone wants to create an article for it that would be great. Volcanoguy 18:48, 28 December 2010 (UTC)

I've added it to my 'to-do' list, but don't hold your breath. Mikenorton (talk) 18:58, 28 December 2010 (UTC)

I have already created an article for it. Volcanoguy 17:08, 29 December 2010 (UTC)

OK, updated my 'to-do' list to expand that. Cheers, Mikenorton (talk) 17:27, 29 December 2010 (UTC)

Granite emplacement

My 1970 studies on salt diapirs in the Flinders Ranges, South Australia, suggested that mobility of the salt-breccia masses was key to emplacement. The intruding material could be of greater density than the host. Emplacement was by dyke wedging into zones of extension (the S2-S3 planes, normal to compressive S1 stresses, thus requiring very little upward force; ie 'permitted intrusions'. This mechanism should also apply to many types of igneous intrusion, including some/many? granites.

The Bathurst Granite in NSW, Australia, is such an example. The 'batholith' can be viewed as a massive dyke, 100x30km, set in S1-S2 planes parallel to the principal palaeo stress direction(normal to S3, under thick overburden (S2).

Pre-existing and developing fracture systems in the host rocks appear to have controlled the dyke geometry. Opposing dyke margins can be roughly matched 'continental drift style' across such megadykes.

Assimilation (minor? and block stoping may have modified the basic dyke form.

203.3.232.28 (talk) 23:28, 2 May 2011 (UTC)

Do you have a reference for the Bathurst granite? See Nick Petford, Ross C. Kerr and John R. Lister, Dike transport of granitoid magmas, Geology; September 1993; v. 21; no. 9; p. 845-848 - maybe should work this into the article. Vsmith (talk) 12:31, 3 May 2011 (UTC)

Well mayhaps I should look first :) the Ascent and emplacement section already discusses fracture propagation by self-propagating dykes ... Vsmith (talk) 12:39, 3 May 2011 (UTC)

Not aware of any papers on the form of the Bathurst Granite . . . I have used published 250,000 map sheets to compare plan views of the outcrop with Flinders Ranges diapirs. I fully acknowledge prior work on dyke mechanisms for granites etc, but my purpose was to emphasise(some)granite emplacement as permitted intrusions in planes parallel to principal stress directions, under thick overburden, so pull-apart is normal to S1, and to emphasise that the host rocks were brittle (or semi-plastic). These are complex fat dykes, not like Gulf Coast salt domes.203.3.232.28 (talk) 02:59, 5 May 2011 (UTC)

Retrieved from "http://en.wikipedia.org/wiki/User_talk:Vsmith" —Preceding unsigned comment added by 203.3.232.28 (talk) 03:10, 5 May 2011 (UTC)