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Re: TinkerBelle post# 143553

Friday, 04/08/2011 8:30:33 PM

Friday, April 08, 2011 8:30:33 PM

Post# of 233166
That pull apart is limited to a small area and does not continue along the trace placed on the map. It is common to have such basins where strike slip faults change direction and the orientation of that change in direction effectively pulls apart the area creating a depression or basin - hence the name pull apart basin. Of course structural geologists like to use a fancy term called a rhomochasm. Death Valley is an example of such a process.

So the trace on that map is inaccurate. But they were still formed in a basin, just not a pull apart basin.

I will have to search for a link because I am going from memory on the original of the Avalon Zone. It has been a long time since my undergrad days on the island, but I am fairly confident that these rocks are part of the the UK.

You can probably google the "Avalon Zone" and find some references.

The suture between the Avalon and Gander zones record the closing of the former Iapetus Ocean (Proto Atlantic). ahh here is a link...

http://www.jamestown-ri.info/alleghenian.htm

If you take a look at this link it gives you some basic history on the formation of Pangaea and the various orogenies that happened along the east coast. In addition, the lowermost figure illustrates that the western part of NL is part of the same mtn range that extends from the US through the UK and Greenland. However, the Avalon Zone is part of the UK (southern) only and Baltica.

Hope this helps clear things up.