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Originally posted by xXxinfidelxXx
reply to post by boncho
The Canadian Shield was formed when giant glaciers (which also shaped-out the Hudson's Bay) started to recede, leaving behind all of the rocks and minerals that they had scraped off the ground on their way south. There are no volcanoes in Canada, extinct or otherwise.
The Canadian Shield, also called the Laurentian Plateau, or Bouclier Canadien (French), is a vast geological shield covered by a thin layer of soil that forms the nucleus of the North American or Laurentia craton. It is an area mostly composed of igneous rock which relates to its long volcanic history.
Originally posted by OnWhiteMars
reply to post by boncho
That single photo does hold resemblance, though I'm not fully convinced yet. The surroundings were too different. No aliens in my mind
Thanks anyway!
Originally posted by xXxinfidelxXx
reply to post by boncho
You need to do more research on glacial movements in this country before trying to debate such a thing. Igneous rock, like any other forms found in the Canadian Shield, was scraped and dragged down by glacial movements and left there when said glaciers receded. You're gonna need more than one sentence to disprove that.
The shield is considered to have been originally an area of very large mountains and much volcanic activity, but over the millennia the area was eroded to its current topographic appearance of relatively low relief (984 to 1,968.5 feet above sea level) with diverse ridges and low mountain ranges. It is considered the first region in North America to be elevated permanently above sea level, not having been subsequently submerged by encroachments of the oceans.
The shield contains some of the most ancient volcanoes on earth. It has over 150 volcanic belts (now deformed and eroded down to nearly flat plains) that range from 600 to 1,200 million years old. Each belt probably grew by the coalescence of accumulations erupted from numerous vents, making the tally of volcanoes in the hundreds. Many of Canada's major ore deposits are associated with Precambrian volcanoes.
Mountains have deep roots and float on denser mantle, much like an iceberg at sea. As mountains erode, their roots rise and are eroded in turn. The rocks that now form the surface of the shield were once far below the earth's surface. The high pressures and temperatures at those depths provided ideal conditions for mineralization.
The North American craton is the bedrock forming the heart of the North American continent and the Canadian Shield is the largest exposed part of the craton's bedrock. The Canadian Shield is part of an ancient continent called Arctica, which was formed about 2.5 billion years ago. It was split into Greenland, Laurasia, Scotland, Siberia, East Antarctica and is now roughly situated in the Arctic around the current North Pole.
Igneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks.
Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.
Originally posted by xXxinfidelxXx
reply to post by boncho
There are no volcanoes in Canada, extinct or otherwise.
Originally posted by xXxinfidelxXx
reply to post by punkinworks10
You do realize that we were debating the origins of the Canadian Shield.....right? So I was wrong about there being no volcanoes in Canada. That does not make the origins of the Canadian Shield in any way volcanic.
The multitude of rivers and lakes in the entire region is caused by the watersheds of the area being so young and in a state of sorting themselves out with the added effect of post-glacial rebound. The Shield was originally an area of very large mountains (about 12,000 metres or 39,000 feet) [7] with much volcanic activity, but over hundreds of million of years, the area has been eroded to its current topographic appearance of relatively low relief. [citation needed] It has some of the oldest (extinct) volcanoes on the planet.
Originally posted by OnWhiteMars
reply to post by Phage
Thanks. More of the same resemblance in that image. Maybe there is a reason after all why it is considered as natural.
Originally posted by OnWhiteMars
Back to the topic. As it seems the foundation is naturally formed, but what intrigued me was the remark ofit as an holy place. That only a few have the 'right' to visit the place. Though, that might be very common in cases like this, when Mother Nature has provided the surroundings.
Thanks for all the contribution so far!edit on 13-12-2012 by OnWhiteMars because: (no reason given)