Jump to content

Talk:Central Atlantic magmatic province

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia

Comments

[edit]

Before 200Ma, a spreading ridge running east-west through the length of the ancient Tethys ocean gradually opened up that seaway. About 200Ma, the western end of that Mid-Ocean Ridge (MOR) reached, and ran under, the supercontinent of Pangea, between Africa (to the south) and North America (to the north), as indicated in the following figures:

http://imageshack.us/a/img29/4546/insularislands400200mya.png
http://imageshack.us/a/img441/3249/insularislands20050mya.png

Now, about 50Ma, the west coast of North America obducted over another MOR (the east Pacific rise). The spreading ridge underneath the continental crust caused crustal thinning, and minor rifting, generating the Basin and Range province, as well as the Yellowstone hotspot and Columbia River Basalt Group. Thus, the CAMP resembles those continental rift zones, except running perpendicular to the coast (instead of parallel to), and on a larger scale, which successfully rifted Africa from North America. Perhaps rifting is facilitated, by perpendicular incidence, of the spreading zone??

More speculatively, about 95Ma, the Tethys MOR may have been subducted under Eurasia, pulling India, then Africa, northwards towards Eurasia. About that time, northern Africa was flooded, leading to the extinction of large northern African dinosaurs & reptiles, like Spinosaurus, Carcharodontosaurus, Paralititan, Sarcosuchus (according to the BBC documentary Planet Dinosaur). Perhaps a change, from compressive force coming southwards from a MOR into northern African continental crust, before 95Ma; to an extensional force pulling northwards to a Subduction Zone (SZ) before Eurasia; caused the northern African crust to stop thickening, and start thinning, depressing the surface below Tethys-sea level?? 66.235.38.214 (talk) 12:45, 17 October 2012 (UTC)[reply]

[edit]

Hello fellow Wikipedians,

I have just modified one external link on Central Atlantic magmatic province. 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).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 15:14, 24 January 2018 (UTC)[reply]