[meteorite-list] Like meteorites, lightning bolts can reshape rocks
From: Shawn Alan <shawnalan_at_meteoritecentral.com>
Date: Fri, 14 Aug 2015 15:23:03 -0700
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Like meteorites, lightning bolts can reshape rocks
Around the globe, lightning flashes 44 times a second. Contrast that
with meteorite impacts, which occur just five to 10 times per year.
Yet according to a new study led by Penn geologist Reto Gier?, both
natural phenomena can do the same, unusual thing: deform rocks at the
?It?s like if someone pushes you, you rearrange your body to be
comfortable,? says Gier?, professor and chair of the Department of
Earth and Environmental Science in the School of Arts & Sciences. ?The
mineral does the same thing.?
Gier?, who embarked on the study with researchers from Germany and
Australia, discovered the similarity in a sample of quartz from a rock
outcropping in southern France. The rock had been struck by lightning
and fractured. The researchers could see that the area in and around the
fracture was covered in a distinctive black coating.
Received on Fri 14 Aug 2015 06:23:03 PM PDT