A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Space Science » News
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Researchers discover new impact crater in the Arctic (Forwarded)

Thread Tools Display Modes
Old August 9th 12, 08:43 PM posted to sci.space.news
Andrew Yee[_1_]
external usenet poster
Posts: 1,209
Default Researchers discover new impact crater in the Arctic (Forwarded)

Research Communications
University of Saskatchewan
Saskatoon, Saskatchewan

August 07, 2012

Researchers discover new impact crater in the Arctic

Researchers from the University of Saskatchewan and the Geological Survey of
Canada (GSC) have discovered a massive meteor impact from millions of years
ago in Canada's western Arctic.

Located on the northwestern part of Victoria Island, the impact crater, or
astrobleme, is about 25 km wide and is Canada's 30th known meteorite impact

"It's another piece of the cosmic Earth puzzle," explained U of S geology
professor Brian Pratt, who made the discovery with GSC colleague Keith
Dewing. "Impact craters like this give us clues into how the Earth's crust
is recycled and the speed of erosion, and may be implicated in episodes of
widespread extinction of animals in the geological past."

The researchers discovered the crater two summers ago while exploring the
area by helicopter for the Natural Resources Canada (NRCan) Geo-Mapping for
Energy and Minerals program, and it took two years to properly assemble the
geological maps and submit their article for publication. Pratt and Dewing
named the new discovery the Prince Albert impact crater after the peninsula
where it is situated.

And while there is no way to pinpoint the exact timing of the impact,
evidence suggests the crater is younger than about 350 million years but
older than about 130 million years. One of the questions asked of Pratt is
how could something this large lay undiscovered for so long.

"Several geologists visited that area in the '60s and '70s," said Pratt. "It
was those old industry reports of steeply tilted strata, unusual in the
western Arctic, that had us intrigued. Unless you recognized the telltale
clues, you wouldn't know what you were looking at. You might see a bunch of
broken rocks and wonder how they got there, but we found abundant shatter
cones. These are radiating crack surfaces up to a metre in size that are
formed from the enormous amount of energy created when a meteorite slams
into the Earth's crust. Our map showed that the feature is circular which is
characteristic of impact craters. It's an exciting discovery."

There are at least 160 known meteorite impact features on Earth. Because of
the extent of ocean coverage, the effects of weathering and erosion, and the
dynamic nature of plate tectonics, Pratt said geologists believe many more
meteorites must have hit the Earth but there is now no trace of them.

For maps and additional photos, visit the U of S Flickr gallery


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
U.Toronto researchers discover clues to early solar system (Forwarded) Andrew Yee Astronomy Misc 0 August 6th 07 10:47 PM
U.Toronto researchers discover clues to early solar system (Forwarded) Andrew Yee[_1_] News 0 August 6th 07 09:56 PM
Researchers using Arecibo Telescope discover never-before-seen pulsar blasts in Crab Nebula (Forwarded) Andrew Yee News 0 January 9th 07 12:43 AM
Researchers using Arecibo Telescope discover never-before-seen pulsarblasts in Crab Nebula (Forwarded) Andrew Yee Astronomy Misc 0 January 9th 07 12:41 AM
Discovery of a double impact crater in Libya (Forwarded) Andrew Yee Astronomy Misc 0 December 17th 03 04:00 PM

All times are GMT +1. The time now is 10:20 PM.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 SpaceBanter.com.
The comments are property of their posters.