![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
While there is plenty of granite in the upper crust, the composition of the crust is andesitic. The confusion is around the word granitic. Geologist divide the igneous rocks into ocean crust (mafic) and continental crust (granitic or felsic). Granite is one of the much broader class of granitic rocks which include andesite. So saying the continental crust is granitic, while technically accurate is likely misleading for the average reader who may believe that this means the crust is mostly granite. http://www.tos.org/oceanography/issues/issue_archive/issue_pdfs/19_4/19.4_tatsumi_stern.pdf Yes, I know that you can find references that say its granitic, but look to the more fundamental references and there is no disagreement. 96.252.103.113 ( talk) 18:43, 11 December 2008 (UTC)
The continental crust extends down 30 km from the land surface and most of it is below sea level. This could be corrected by adding the word "surface". The surface of the continental crust is mostly above sea level. But complete rewriting is probably a better choice. 96.252.103.113 ( talk) 22:03, 10 December 2008 (UTC)
More on the origin, please! 213.47.144.254 ( talk) 20:32, 6 August 2010 (UTC) I did enter the notion that is entirely possible that the volume of continental crust has not changed much over time. As the article by Armstrong states there is little reason to assume that the differentiation between lighter and heavier minerals did not happen very soon after Earth was formed and also Mars and the Moon show a clear distinction between higher (continental crust) area's and lower area's (oceanic crust) without ever having gone through the process of plate tectonics. So the main effect of plate tectonics on the continental crust might just be the clustering of thin, wide spread sections of crust into the thick proto-continents we call cratons today. The parts of the crust that formed the cratons have a far better chance of survival, become the robust building blocks of plate tectonics, which may explain the age-differences found. I'm not a specialist myself but I do find his reasoning to be very compelling and I do not see how, when Mars has clearly formed a lot of continental crust without plate tectonics, this would not have happened on Earth also (even easier, as Earth would have taken longer to cool to a solid state and thus creating more time for gravity based differentiation). I do wonder though whether the oxidisation of the atmosphere would not create more light (weathered) silicates over time. Or is this being reversed as plate tectonics start to recycle parts of the continental crust?-- Codiv ( talk) 13:31, 5 May 2021 (UTC)
Here is an attempt to sort out the references listed in the article:
I'll try to make in-line references of these as much as possible. -- Fama Clamosa ( talk) 13:34, 31 January 2011 (UTC)
I think I've managed to attribute most content to one ref or another. References added December 2 2007 are only tentatively sorted to match article content (only abstracts were available to me). -- Fama Clamosa ( talk) 15:53, 31 January 2011 (UTC)
I have spent a lot of time trying to understand the exact process of continental crust formation. This article is not helpful in understanding current theory. There's only a few sentences on crust creation. I understand a lot of that information could go into the section on cratons and/or shields, but a better explanation here might be helpful and educational. An explanation of differention and how it relates to continental crust formation would be nice. An explanation of how island arcs could have accreted over time to form the core of continents would be nice. An explanation of subduction mechanics vs the role hot spots (plumes) in the origin of continental crust would be nice. Did objects hitting the earth play a role in the creation of continental crust? — Preceding unsigned comment added by 15.195.201.89 ( talk) 16:22, 15 December 2011 (UTC)
The basic concept is one of gravitation acting to differentiate between lighter and heavier components in a molten earth. The heaviest metal components formed the iron/nickel core and the silicates differentiate between the more dense mantle and less dense crust silicates. Object hitting the earth just added extra building blocks (the entire Earth has been made out of this), the composition of asteroids are either metallic (siderites) or silicates (chondrites) or a combination of both. They would just become a part of our planet, a process that is still in process every day (which you can see happening across the night sky every night), although a metallic meteorite hitting the earth today will have little or no chance of ever becoming a part of the core. -- Codiv ( talk) 14:24, 5 May 2021 (UTC)
I'm looking for citations for the "Importance" section, and it looks like it was lifted right off of a blog post. [1] I'm not sure which came first, though. I'm looking through various sources to try to corroborate the bit about metazoan life. I figure that would be a good start for possibly expanding this section. Skolithos ( talk) 02:27, 30 November 2013 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Continental crust. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 16:07, 12 August 2017 (UTC)
Hello editors,
Because of you we have many made many topics for us to learn So I request you to please add more content to this topic 😊 Thank you
Yours sincerely, Princess Anu (*I can not tell my real name*) PrettyPrincessAnu ( talk) 16:15, 26 June 2021 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||
|
While there is plenty of granite in the upper crust, the composition of the crust is andesitic. The confusion is around the word granitic. Geologist divide the igneous rocks into ocean crust (mafic) and continental crust (granitic or felsic). Granite is one of the much broader class of granitic rocks which include andesite. So saying the continental crust is granitic, while technically accurate is likely misleading for the average reader who may believe that this means the crust is mostly granite. http://www.tos.org/oceanography/issues/issue_archive/issue_pdfs/19_4/19.4_tatsumi_stern.pdf Yes, I know that you can find references that say its granitic, but look to the more fundamental references and there is no disagreement. 96.252.103.113 ( talk) 18:43, 11 December 2008 (UTC)
The continental crust extends down 30 km from the land surface and most of it is below sea level. This could be corrected by adding the word "surface". The surface of the continental crust is mostly above sea level. But complete rewriting is probably a better choice. 96.252.103.113 ( talk) 22:03, 10 December 2008 (UTC)
More on the origin, please! 213.47.144.254 ( talk) 20:32, 6 August 2010 (UTC) I did enter the notion that is entirely possible that the volume of continental crust has not changed much over time. As the article by Armstrong states there is little reason to assume that the differentiation between lighter and heavier minerals did not happen very soon after Earth was formed and also Mars and the Moon show a clear distinction between higher (continental crust) area's and lower area's (oceanic crust) without ever having gone through the process of plate tectonics. So the main effect of plate tectonics on the continental crust might just be the clustering of thin, wide spread sections of crust into the thick proto-continents we call cratons today. The parts of the crust that formed the cratons have a far better chance of survival, become the robust building blocks of plate tectonics, which may explain the age-differences found. I'm not a specialist myself but I do find his reasoning to be very compelling and I do not see how, when Mars has clearly formed a lot of continental crust without plate tectonics, this would not have happened on Earth also (even easier, as Earth would have taken longer to cool to a solid state and thus creating more time for gravity based differentiation). I do wonder though whether the oxidisation of the atmosphere would not create more light (weathered) silicates over time. Or is this being reversed as plate tectonics start to recycle parts of the continental crust?-- Codiv ( talk) 13:31, 5 May 2021 (UTC)
Here is an attempt to sort out the references listed in the article:
I'll try to make in-line references of these as much as possible. -- Fama Clamosa ( talk) 13:34, 31 January 2011 (UTC)
I think I've managed to attribute most content to one ref or another. References added December 2 2007 are only tentatively sorted to match article content (only abstracts were available to me). -- Fama Clamosa ( talk) 15:53, 31 January 2011 (UTC)
I have spent a lot of time trying to understand the exact process of continental crust formation. This article is not helpful in understanding current theory. There's only a few sentences on crust creation. I understand a lot of that information could go into the section on cratons and/or shields, but a better explanation here might be helpful and educational. An explanation of differention and how it relates to continental crust formation would be nice. An explanation of how island arcs could have accreted over time to form the core of continents would be nice. An explanation of subduction mechanics vs the role hot spots (plumes) in the origin of continental crust would be nice. Did objects hitting the earth play a role in the creation of continental crust? — Preceding unsigned comment added by 15.195.201.89 ( talk) 16:22, 15 December 2011 (UTC)
The basic concept is one of gravitation acting to differentiate between lighter and heavier components in a molten earth. The heaviest metal components formed the iron/nickel core and the silicates differentiate between the more dense mantle and less dense crust silicates. Object hitting the earth just added extra building blocks (the entire Earth has been made out of this), the composition of asteroids are either metallic (siderites) or silicates (chondrites) or a combination of both. They would just become a part of our planet, a process that is still in process every day (which you can see happening across the night sky every night), although a metallic meteorite hitting the earth today will have little or no chance of ever becoming a part of the core. -- Codiv ( talk) 14:24, 5 May 2021 (UTC)
I'm looking for citations for the "Importance" section, and it looks like it was lifted right off of a blog post. [1] I'm not sure which came first, though. I'm looking through various sources to try to corroborate the bit about metazoan life. I figure that would be a good start for possibly expanding this section. Skolithos ( talk) 02:27, 30 November 2013 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Continental crust. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 16:07, 12 August 2017 (UTC)
Hello editors,
Because of you we have many made many topics for us to learn So I request you to please add more content to this topic 😊 Thank you
Yours sincerely, Princess Anu (*I can not tell my real name*) PrettyPrincessAnu ( talk) 16:15, 26 June 2021 (UTC)