加拿大亚伯达省古代曾遭大规模陨星撞击

The discovery of an ancient ring-like structure in southern Alberta suggests the area was struck by a meteorite¹（陨星） large enough to leave an eight-kilometre-wide crater², 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 geologist³ 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 glaciers⁴ have buried and eroded⁵ 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 seismic⁶ and geological evidence strongly suggests, said Schmitt, a professor in the Faculty⁷ 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 sediment⁸ 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 devastating⁹ 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 debris¹⁰ in the air, potentially would have global consequences; there could have been ramifications¹¹ 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, peeking¹² into Earth by analyzing¹³ seismic data donated by industry. Schmitt's student, Todd Brown, later confirmed a crater-like structure.