Dear List, "Scientists Say Dinosaur-Killing Asteroid Made Earth's Surface Act Like Liquid:" http://www.npr.org/sections/thetwo-way/2016/11/22/503013290/scientists-say-d inosaur-killing-asteroid-made-earths-surface-act-like-liquid "...recently published in the journal "Science." Deep drilled samples from the crater... settled a major debate about how a planet's surface behaves during an asteroid impact - and how the mountain ring, known as a "peak ring," is formed. Some researchers have argued that the process is dominated by melting on the surface, which would mean that the ring is mainly formed from material moving from side-to-side.
In that model this ring of peaks are created by shallow material kind of moving towards the center and being uplifted. "On the drill floor when we're out there, out in our hard hats and so on, looking at these cores coming up," the researchers were seeing pink granite that emerged from about 6 miles deep in the Earth and not the limestone that would have been on the surface during the Cretaceous Period... Everybody staring at it went, 'Wow, there's the answer. It's from deep.' " The researcher was Sean Gulick, a geophysicist at the University of Texas, Austin. Gulick helped lead a team of researchers that drilled for samples of that mountain ring in the Chicxulub crater off the coast of Mexico. Sterling K. Webb ______________________________________________ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list