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Ancient crater points to massive meteorite strike

Date:
May 7, 2014
Source:
University of Alberta
Summary:
An eight-kilometer-wide crater suggests a meteorite strike devastated southern Alberta within the last 70 million years, experts theorize. Time and glaciers have buried and eroded much of the evidence, making it impossible at this point to say with full certainty the ring-like structure was caused by a meteorite impact, but that's what seismic and geological evidence strongly suggests.

This is a map showing the structure and contour of the Bow City crater. Color variation shows meters above sea level.
Credit: Alberta Geographic Survey/University of Alberta

The discovery of an ancient ring-like structure in southern Alberta suggests the area was struck by a meteorite large enough to leave an eight-kilometre-wide crater, producing an explosion strong enough to destroy present-day Calgary, say researchers from the Alberta Geological Survey and University of Alberta.

The first hints about the impact site near the southern Alberta hamlet of Bow City were discovered by a geologist with the Alberta Geological Survey and studied by a U of A team led by Doug Schmitt, Canada Research Chair in Rock Physics.

Time and glaciers have buried and eroded much of the evidence, making it impossible at this point to say with full certainty the ring-like structure was caused by a meteorite impact, but that's what seismic and geological evidence strongly suggests, said Schmitt, a professor in the Faculty of Science and co-author of a new paper about the discovery.

"We know that the impact occurred within the last 70 million years, and in that time about 1.5 km of sediment has been eroded. That makes it really hard to pin down and actually date the impact."

Erosion has worn away all but the "roots" of the crater, leaving a semicircular depression eight kilometres across with a central peak. Schmitt says that when it formed, the crater likely reached a depth of 1.6 to 2.4 km -- the kind of impact his graduate student Wei Xie calculated would have had devastating consequences for life in the area.

"An impact of this magnitude would kill everything for quite a distance," he said. "If it happened today, Calgary (200 km to the northwest) would be completely fried and in Edmonton (500 km northwest), every window would have been blown out. Something of that size, throwing that much debris in the air, potentially would have global consequences; there could have been ramifications for decades."

The impact site was first discovered in 2009 by geologist Paul Glombick, who at the time was working on a geological map of the area for the Alberta Geological Survey. Glombick relied on existing geophysical log data from the oil and gas industry when he discovered a bowl-shaped structure.

The Alberta Geological Survey contacted the U of A and Schmitt to explore further, peeking into Earth by analyzing seismic data donated by industry. Schmitt's student, Todd Brown, later confirmed a crater-like structure.


Story Source:

The above story is based on materials provided by University of Alberta. Note: Materials may be edited for content and length.


Journal Reference:

  1. Paul Glombick, Douglas R. Schmitt, Wei Xie, Todd Bown, Ben Hathway, Christopher Banks. The Bow City structure, southern Alberta, Canada: The deep roots of a complex impact structure? Meteoritics & Planetary Science, 2014; DOI: 10.1111/maps.12296

Cite This Page:

University of Alberta. "Ancient crater points to massive meteorite strike." ScienceDaily. ScienceDaily, 7 May 2014. <www.sciencedaily.com/releases/2014/05/140507105023.htm>.
University of Alberta. (2014, May 7). Ancient crater points to massive meteorite strike. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2014/05/140507105023.htm
University of Alberta. "Ancient crater points to massive meteorite strike." ScienceDaily. www.sciencedaily.com/releases/2014/05/140507105023.htm (accessed September 20, 2014).

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